As filed with the Securities and Exchange Commission on January 26, 2009

Securities Act File No. 33-20827

Investment Company Act File No. 811-5518

U.S. SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM N-1A

The RBB Fund, Inc.

(Exact Name of Registrant as Specified in Charter)

Bellevue Park Corporate Center

103 Bellevue Parkway

Wilmington, DE 19809

(Address of Principal Executive Offices)

Registrant’s Telephone Number: (302) 791-1112

Copies to:

It is proposed that this filing will become effective (check appropriate box)

If appropriate, check the following box:

Title of Securities Being Registered: ……….Shares of Common Stock.

Subject to Completion

Preliminary Prospectus

Institutional Class

Robeco Investment Funds

of The RBB Fund, Inc.

THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. WE MAY NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED WITH THE SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER TO SELL THESE SECURITIES AND IS NOT SOLICITING AN OFFER TO BUY THESE SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.

Prospectus

SAM Sustainable Global Active Fund

SAM Sustainable Themes Fund

The securities described in this prospectus have been registered with the Securities and Exchange Commission (“SEC”). The SEC, however, has not judged these securities for their investment merit and has not determined the accuracy or adequacy of this prospectus. Anyone who tells you otherwise is committing a criminal offense.

TABLE OF CONTENTS

A look at the investment objectives, strategies, risks, expenses and financial history of each of the Robeco Investment Funds.

Details about the Robeco Investment Funds’ service providers.

Policies and instructions for opening, maintaining and closing an account in any of the Robeco Investment Funds.

- 2 -

INTRODUCTION

This Prospectus is intended to provide you with the information you need to make an informed decision about whether to invest in the Institutional Class of the SAM Sustainable Global Active Fund or SAM Sustainable Themes Fund (the “Funds”), two of the Robeco Investment Funds of The RBB Fund, Inc. (the “Company”).

Sustainable Asset Management USA, Inc. (“SAM” or the “Adviser”) provides investment advisory services to the Funds.

This Prospectus has been organized so that each Fund has its own short section with important facts about the investment objectives, strategies, risks and expenses of the particular Fund. Once you read the sections about the Funds, read the “Purchase of Fund Shares” and “Redemption of Fund Shares” sections. These two sections apply to both of the Funds offered by this Prospectus.

- 3 -

SAM SUSTAINABLE GLOBAL ACTIVE FUND

IMPORTANT DEFINITIONS:

Equity Security: A security, such as a stock, representing ownership of a company. Bonds, in comparison, are referred to as fixed-income or debt securities because they represent indebtedness to the bondholder, not ownership.

Market Capitalization: Market capitalization refers to the market value of a company and is calculated by multiplying the number of shares outstanding by the current price per share.

Investment Objective

The Fund seeks long-term growth of capital primarily through investment in equity and equity-related securities.

Principal Investment Strategies

The Fund pursues it objective by investing, under normal circumstances, at least 80% of its net assets (including any borrowings for investment purposes) in a carefully selected non-diversified portfolio of equity and equity-related securities issued by U.S. and non-U.S. companies that combine their market and financial strategy with a high level of environmental awareness and a clearly defined social policy (“Sustainable Issuers”). The Fund will notify shareholders in writing at least 60 days prior to any change in this 80% policy.

Sustainable Issuers include companies in SAM’s universe of sustainable investments. SAM determines its universe of sustainable investments by analyzing economic, environmental and social criteria. Economic criteria include, without limitation, the issuer’s codes of conduct, compliance policies, instances of corruption or bribery, corporate governance policies, risk and crisis management policies and certain industry specific criteria. Environmental criteria include, without limitation, the issuer’s eco-efficiency, environmental reporting, and certain industry specific criteria. Finally, social criteria include, without limitation, the issuer’s corporate citizenship, philanthropy, labor practices, human capital development practices, social reporting, ability to attract and retain talent, and certain industry specific criteria. SAM believes that these characteristics of Sustainable Issuers make them better equipped to identify and respond to the opportunities and risks presented by global trends. The Fund defines non-U.S. companies as companies (i) that are organized under the laws of a foreign country; (ii) whose principal trading market is in a foreign country; or (iii) that have a majority of their assets, or that derive a significant portion of their revenue or profits from businesses, investments or sales, outside of the United States. Under normal market conditions, the Fund invests significantly (generally at least 40%—unless market conditions are not deemed favorable by SAM, in which case the Fund would invest at least 30%) in non-U.S. companies. The Fund generally will be invested in issuers located in countries with developed securities markets, but may also invest in issuers located in emerging markets. Under normal market conditions, the Fund expects that its investment in emerging markets will not exceed 30%. The Fund will allocate its assets among various regions and countries, including the United States (but in no less than three different countries).

In selecting portfolio securities for the Fund, SAM first defines the eligible universe through its sustainability research. SAM starts with macro research, continues by screening companies for sustainability and eliminates companies that are too small or illiquid. Second, valuations of companies are conducted using SAM’s unique discounted cash flow model, which is based on financial criteria as well as sustainability aspects pertaining to the environment, social criteria and profitability. Sustainability means striving to achieve economic success, while at the same time considering ecological and social objectives. In assessing sustainability, areas such as corporate strategy, corporate governance, transparency as well as product and service range of a company will be taken into consideration. Finally, SAM applies its bottom-up portfolio construction process, which utilizes the valuations of the companies, and is based on the discrepancy between security price and sustainable fair value and on the portfolio risk characteristics of the company’s securities.

The Fund may invest in companies of any market capitalization and currently expects that a significant amount of the Fund’s assets will be invested in micro-, small- and mid-capitalization companies. Micro- and small-capitalization companies generally will have market capitalizations under $2 billion. Mid-capitalization companies generally will have market capitalizations between $2 billion and $10 billion. Large capitalization companies generally will have capitalizations

- 4 -

of over $10 billion. The Fund may also invest in securities of other investment companies, including exchange-traded funds (“ETFs”). The Fund may invest up to 20% of its assets in equity and equity-related securities issued by non-Sustainable Issuers. The Fund may (but is not required to) invest in derivatives, including foreign currency exchange contracts and participatory notes, in lieu of investing directly in a security, currency or instrument, or for hedging purposes.

While SAM intends to fully invest the Fund’s assets at all times in accordance with the above described policies, the Fund reserves the right to hold up to 100% of its assets, as a temporary defensive measure in response to adverse market, economic, political or other conditions, in cash and eligible U.S. dollar-denominated money market instruments, such as commercial paper, government obligations and bank obligations issued by U.S. and foreign issuers. When the Fund’s assets are invested in cash or money market instruments, the Fund may not achieve its investment objective. SAM will determine when adverse market, economic, political or other conditions warrant temporary defensive measures.

Principal Risks

- 5 -

Risk/Return Information

The bar chart and performance table have been omitted because the Fund has not been in operation for a full calendar year. The Fund intends to evaluate its performance as compared to that of a broad-based index, the MSCI World Index. The MSCI World Index is a free float-adjusted market capitalization index that is designed to measure global developed market equity performance.

- 6 -

Expenses and Fees

As a shareholder, you pay certain fees and expenses. The table below describes the fees and expenses that you may pay if you buy and hold Institutional Class shares of the Fund.

*Shareholders requesting redemptions by wire are charged a transaction fee of $7.50. A $15.00 custodial maintenance fee is charged per IRA account per year.

(1) To prevent the Fund from being adversely affected by the transaction costs associated with short-term shareholder transactions, the Fund will redeem shares at a price equal to the net asset value of the shares, less an additional transaction fee equal to 1.00% of the net asset value of all such shares redeemed that have been held for less than 60 days (other than shares held by defined contribution plans). Similarly, the Fund charges a transaction fee of 1.00% for any exchange of Fund shares held for less than 60 days (other than shares held by defined contribution plans and shares purchased through the reinvestment of dividends or capital gains distributions.) Such fees are not sales charges or contingent deferred sales charges, but are retained by the Fund for the benefit of remaining shareholders.

(2) Other expenses for the Fund are based on estimated amounts for the current fiscal year. Other expenses include audit, administration, custody, legal, registration, transfer agency and miscellaneous other charges for the Institutional Class.

(3) SAM has contractually agreed to waive all or a portion of its advisory fee and/or reimburse expenses in an aggregate amount equal to the amount by which the Fund’s Total annual Fund operating expenses (other than brokerage commissions, extraordinary items, interest or taxes) exceeds 1.20% of the first $50 million of Fund’s average daily net assets, 1.10% if the Fund’s average daily net assets are between $50 million and $100 million, and 1.00% if the Fund’s average daily net assets exceed $100 million through December 31, 2011. SAM may not recoup any of its waived investment advisory fees.

Example

The example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% return each year, that the operating expenses of the Fund remain the same, and that you reinvested all dividends and distributions. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

- 7 -

SAM SUSTAINABLE THEMES FUND

IMPORTANT DEFINITIONS:

Equity Security: A security, such as a stock, representing ownership of a company. Bonds, in comparison, are referred to as fixed-income or debt securities because they represent indebtedness to the bondholder, not ownership.

Market Capitalization: Market capitalization refers to the market value of a company and is calculated by multiplying the number of shares outstanding by the current price per share.

Investment Objective

The Fund seeks long-term growth of capital primarily through investment in equity and equity-related securities.

Principal Investment Strategies

The Fund pursues it objective by investing, under normal circumstances, at least 80% of its net assets (including any borrowings for investment purposes) in a carefully selected non-diversified portfolio of equity and equity-related securities issued by U.S. and non-U.S. companies from sectors that benefit from current environmental, social and economic trends. SAM believes that environmental, social and economic trends such as the limited supply of fossil fuels, demand for unrestricted mobility of people, goods and information, competition for limited raw materials, escalating demand for water and current global demographic changes, present unique growth opportunities for companies in a wide range of industries. The Fund will notify shareholders in writing at least 60 days prior to any change in this 80% policy.

Based on multi-level theme and trend analyses, the Fund will primarily invest in four sustainability sectors, or investment themes, including: energy, water, healthy living and resource efficiency. Issuers in the energy investment theme include, without limitation, oil companies, oil and gas exploration companies, natural gas pipeline companies, refinery companies, energy conservation companies, coal companies, alternative energy companies, and innovative energy technology companies. Issuers in the water investment theme include, without limitation, companies involved in water distribution and water management, water treatment and water purification, water monitoring and chemical analysis, water recycling, sanitary installations and metering, irrigation, and bottled water. Issuers in the healthy living investment theme include, without limitation, companies that grow, process or sell natural and organic foods and personal care products, and companies that manufacture or sell fitness equipment. Issuers in the resource efficiency investment theme include, without limitation companies who manufacture or sell products and services that maximize the efficient use of resources. The Fund defines non-U.S. companies as companies (i) that are organized under the laws of a foreign country; (ii) whose principal trading market is in a foreign country; or (iii) that have a majority of their assets, or that derive a significant portion of their revenue or profits from businesses, investments or sales, outside of the United States. The Fund generally will be invested in issuers located in countries with developed securities markets, but may also invest in issuers located in emerging markets. Under normal market conditions, the Fund expects that its investment in emerging markets will not exceed 30%.

In selecting portfolio securities for the Fund, SAM uses a bottom-up investment process that incorporates a combination of quantitative and fundamental models. The initial step in the process focuses on assessing the impact of long-term macro trends on theme-related companies across all geographic regions and investment clusters. Securities are then selected based on price/value discrepancies, with “expensive” stocks being underweight and attractive stocks being overweight. Additional factors considered include general market conditions, market capitalization exposure, market liquidity, industry sector and geographic allocations, and risk factors, such as size and momentum, as well as total portfolio risk.

SAM integrates “sustainability” into its investment process. The investable universe resulting from the initial stage in the investment process includes companies with the highest expected returns taking into account the impact of sustainability factors. Sustainability as used in this Prospectus means seeking economic success while considering ecological and social objectives. Factors such as corporate strategy, innovation, corporate governance and considerations of the interests of shareholders, employees and other stakeholders are assessed and integrated into company valuations. In determining sustainability, SAM assesses the extent to which companies effectively manage ecological and social

- 8 -

objectives in the course of doing business. Effective management of these objectives should result in lower weighted average cost of capital and a higher return on invested capital.

The Fund may invest in companies of any market capitalization and currently expects that a significant amount of the Fund’s assets will be invested in micro-, small- and mid-capitalization companies. Micro- and small-capitalization companies generally will have market capitalizations under $2 billion. Mid-capitalization companies generally will have market capitalizations between $2 billion and $10 billion. Large capitalization companies generally will have capitalizations of over $10 billion. The Fund may also invest in securities of other investment companies, including exchange-traded funds (“ETFs”). The Fund may invest up to 20% of its assets in equity and equity-related securities issued by companies that do not meet the sustainability criteria described above. The Fund may (but is not required to) invest in derivatives, including foreign currency exchange contracts and participatory notes, in lieu of investing directly in a security, currency or instrument, or for hedging purposes.

While SAM intends to fully invest the Fund’s assets at all times in accordance with the above described policies, the Fund reserves the right to hold up to 100% of its assets, as a temporary defensive measure in response to adverse market, economic, political or other conditions, in cash and eligible U.S. dollar-denominated money market instruments, such as commercial paper, government obligations and bank obligations issued by U.S. and foreign issuers. When the Fund’s assets are invested in cash or money market instruments, the Fund may not achieve its investment objective. SAM will determine when adverse market, economic, political or other conditions warrant temporary defensive measures.

Principal Risks

- 9 -

- 10 -

- 11 -

Risk/Return Information

The bar chart and performance table have been omitted because the Fund has not been in operation for a full calendar year. The Fund intends to evaluate its performance as compared to that of a broad-based index, the MSCI World Index. The MSCI World Index is a free float-adjusted market capitalization index that is designed to measure global developed market equity performance.

- 12 -

Expenses and Fees

As a shareholder, you pay certain fees and expenses. The table below describes the fees and expenses that you may pay if you buy and hold Institutional Class shares of the Fund.

*Shareholders requesting redemptions by wire are charged a transaction fee of $7.50. A $15.00 custodial maintenance fee is charged per IRA account per year.

(1) To prevent the Fund from being adversely affected by the transaction costs associated with short-term shareholder transactions, the Fund will redeem shares at a price equal to the net asset value of the shares, less an additional transaction fee equal to 1.00% of the net asset value of all such shares redeemed that have been held for less than 60 days (other than shares held by defined contribution plans). Similarly, the Fund charges a transaction fee of 1.00% for any exchange of Fund shares held for less than 60 days (other than shares held by defined contribution plans and shares purchased through the reinvestment of dividends or capital gains distributions.) Such fees are not sales charges or contingent deferred sales charges, but are retained by the Fund for the benefit of remaining shareholders.

(2) Other expenses for the Fund are based on estimated amounts for the current fiscal year. Other expenses include audit, administration, custody, legal, registration, transfer agency and miscellaneous other charges for the Institutional Class.

(3) SAM has contractually agreed to waive all or a portion of its advisory fee and/or reimburse expenses in an aggregate amount equal to the amount by which the Fund’s Total annual Fund operating expenses (other than brokerage commissions, extraordinary items, interest or taxes) exceeds 1.50% of the first $50 million of Fund’s average daily net assets, 1.40% if the Fund’s average daily net assets are between $50 million and $100 million, and 1.25% if the Fund’s average daily net assets exceed $100 million through December 31, 2011. SAM may not recoup any of its waived investment advisory fees.

Example

The example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% return each year, that the operating expenses of the Fund remain the same, and that you reinvested all dividends and distributions. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

- 13 -

ADDITIONAL INFORMATION ABOUT THE FUNDS’ INVESTMENTS AND RISKS

This section provides some additional information about the Funds’ investments and certain portfolio management techniques that the Funds may use. More information about the Funds’ investments and portfolio management techniques, some of which entail risks, is included in the SAI.

Additional Information About the Funds’ Principal Investments and Risks

Equity and Equity-Related Securities. Each Fund may invest in all types of equity securities. Equity securities include exchange-traded and over-the-counter common and preferred stocks, warrants, rights, convertible securities, depositary receipts and shares, trust certificates, limited partnership interests, shares of other investment companies and REITs, and equity participations. The number of issuers in the Funds’ portfolios will vary over time.

Foreign Securities. Each Fund may invest in securities of foreign issuers that are traded or denominated in U.S. dollars (including equity securities of foreign issuers trading in U.S. markets) through American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”), European Depositary Receipts (“EDRs”) or International Depositary Receipts (“IDRs”). In addition, the Fund may also invest in securities denominated in foreign currencies. Investments in securities of foreign entities involve special risks. These include possible political and economic instability and the possible imposition of exchange controls or other restrictions on investments. Emerging market investments offer the potential for significant gains but also involve greater risks than investing in more developed countries. Political or economic instability, lack of market liquidity and governmental actions such as currency controls or seizure of private business or property may be more likely in emerging markets.

Each Fund will normally invest a significant portion of its assets in the equity securities and equity-related instruments issued by non-U.S. companies and, under normal market conditions, up to 30% of each Fund’s assets may be invested in issuers located in countries with emerging securities markets. A Fund will invest in securities denominated in the currencies of a variety of emerging and frontier market countries. Each Fund may also invest in securities, instruments and derivatives denominated in multinational currencies such as the Euro. A Fund will value its securities and other assets in U.S. dollars. Unless hedged, currency fluctuations may have a material impact on the performance of a portfolio of non-U.S. dollar-denominated securities and such a portfolio may experience a decline or increase in value, in U.S. dollar terms, due to fluctuations in currency exchange rates. The Adviser currently intends to hedge foreign currency exposure in a Fund’s portfolio. Further, the Funds may also from time to time enter into speculative currency positions independent of other positions in the Funds’ portfolios.

Each Fund may also invest in participatory notes. Participatory notes (commonly known as “P-notes”) are derivative instruments used by investors to take positions in certain foreign securities. P-notes are generally issued by the associates of foreign-based foreign brokerages and domestic institutional brokerages. P-notes represent interests in securities listed on certain foreign exchanges, and thus present similar risks to investing directly in such securities. P-notes also expose investors to counterparty risk, which is the risk that the entity issuing the note may not be able to honor its financial commitments.

Exchange-Traded Funds (ETFs). Each Fund may invest up to 5% of its assets in ETFs. ETFs are registered investment companies whose shares are listed and traded on U.S. stock exchanges or otherwise traded in the over-the-counter market. In general, ETFs seek to track a specified securities index or a basket of securities that an “index provider,” such as Standard & Poor’s, selects as representative of a market, market segment or industry sector. An ETF portfolio generally holds the same stocks or bonds as the index it tracks or it may hold a representative sample of such securities. Thus, an ETF is designed so that its performance will correspond closely with that of the index it tracks. As a shareholder in an ETF, the Funds will bear their pro rata portion of an ETF’s expenses, including advisory fees, in addition to its own expenses.

Other Investment Companies. Each of the Funds may invest up to 10% of its total assets in the securities of other investment companies not affiliated with the Adviser, but may not invest more than 5% of its total assets in the

- 14 -

securities of any one investment company or acquire more than 3% of the voting securities of any other investment company. Among other things, the Funds may invest in money market mutual funds for cash management purposes by “sweeping” excess cash balances into such funds until the cash is invested or otherwise utilized. Each Fund will indirectly bear its proportionate share of any management fees and other expenses paid by investment companies in which it invests in addition to the advisory and administration fees paid by the Fund.

Portfolio Turnover. Each Fund may engage in active and frequent trading, resulting in high portfolio turnover. This may lead to the realization and distribution to shareholders of higher capital gains, increasing their tax liability. Frequent trading may also increase transaction costs, which could detract from the Funds’ performance.

Securities Lending. The Funds may seek to increase their income by lending portfolio securities to institutions, such as certain broker-dealers. Portfolio securities loans are secured continuously by collateral maintained on a current basis at an amount at least equal to the market value of the securities loaned. The value of the securities loaned by a Fund will not exceed 33 1/3% of the value of the Fund’s total assets. A Fund may experience a loss or delay in the recovery of its securities if the borrowing institution breaches its agreement with the Fund.

Temporary Investments. Each of the Funds may depart from its principal investment strategy in response to adverse market, economic, political or other conditions by taking temporary defensive positions (up to 100% of its assets) in all types of money market and short-term debt securities. If a Fund were to take a temporary defensive position, it may be unable for a time to achieve its investment objective.

Disclosure of Portfolio Holdings

Each Fund’s complete portfolio holdings are publicly available on Robeco Investment Management Inc.’s website at www.robecoinvest.com as of each calendar quarter (March 31, June 30, September 30 and December 31) 60 days following the quarter end. Any postings will remain available on the website at least until the Funds file with the SEC their semi-annual or annual shareholder report or quarterly portfolio holdings report that includes such period. A further description of the Company’s policies and procedures with respect to the disclosure of each Fund’s portfolio securities is available in the Funds’ SAI.

- 15 -

MANAGEMENT OF THE FUND

Investment Adviser

The Adviser provides investment management and investment advisory services to investment companies and other institutional and proprietary accounts.

Subject to the general supervision of the Company’s Board of Directors, the Adviser manages the Funds’ portfolio and is responsible for the selection and management of all portfolio investments of the Funds in accordance with the Fund’s investment objectives and policies.

Sustainable Asset Management USA, Inc.

SAM, located at 909 Third Avenue, 32nd Floor, New York, NY 10022 and Josefstrasse 218, CH-8005 Zurich, Switzerland, provides investment advisory services to the Funds. SAM is an affiliate of Robeco Investment Management, Inc., and a subsidiary of Robeco Group. SAM provides investment management and investment advisory services to other institutional and proprietary accounts.

Pursuant to an investment advisory agreement with the Company, SAM is entitled to an advisory fee at the annual rate of 0.80% of the Sustainable Global Active Fund and 1.00% of the Sustainable Themes Fund’s average daily net assets, computed daily and payable monthly. A discussion regarding the Board of Directors’ basis for approving the investment advisory agreement with respect to the SAM Funds will be available in the Funds’ semi-annual report for the period ending February 28, 2009.

SAM has contractually agreed to waive a portion of its advisory fees and/or reimburse expenses to the extent necessary to limit total annual operating expenses of the SAM Global Active Fund to 1.20% of the first $50 million of Fund’s average daily net assets, 1.10% if the Fund’s average daily net assets is between $50 million and $100 million, and 1.00% if the Fund’s average daily net assets exceeds $100 million and has agreed to limit total annual operating expenses of the SAM Themes Fund to 1.50% of the first $50 million of Fund’s average daily net assets, 1.40% if the Fund’s average daily net assets is between $50 million and $100 million, and 1.25% if the Fund’s average daily net assets exceeds $100 million through December 31, 2011. The Adviser may discontinue these arrangements at any time after December 31, 2011.

Portfolio Managers

The investment results for different strategies of the Adviser are not solely dependent on any one individual. There is a common philosophy and approach that is the backdrop for all of the investment strategies of the Adviser. This philosophy is then executed through a very disciplined investment process managed by the designated portfolio manager for the strategy. This manager will be supported, not only by a secondary manager, but by the Adviser’s general research staff and, very often, by dedicated analysts to the particular strategy.

The SAI provides additional information about the portfolio managers’ compensation, other accounts managed by the portfolio managers and the portfolio managers’ ownership of securities in the Fund.

SAM Sustainable Global Active Fund

Diego d’Argenio, CFA, serves as senior portfolio manger for the SAM Sustainable Global Active Fund. He has been employed by SAM and SAM AG since 2005. Prior to that, he worked for three years at ARCA Asset Management in Milan as equity portfolio manager and member of its investment committee in charge of tactical asset allocation development. He started his career in Kuwait Petroleum as Financial analyst. Diego d’Argenio successfully pursued studies in Economics with major in Finance at Rome University. In addition to that he holds a Master in finance and Investment Banking and he is since 2005 a Chartered financial Analyst (CFA).

SAM Sustainable Themes Fund

- 16 -

Rainer Baumann, CFA serves as senior portfolio manager for the SAM Sustainable Themes Fund. He has been dually employed by SAM and SAM AG, since 2002. Prior to that, Mr. Baumann was a portfolio manager for UBS AG where he was responsible for the management of private mandates and was a member of the investment committee in Europe. He started his career as an assistant in the bank audit department at PricewaterhouseCoopers LLP and has a total of 9 years experience. Mr. Baumann is a chartered financial analyst and holds a master’s degree in business administration from the University of Zurich.

Marketing Arrangements

The Adviser, or its affiliates, may pay additional compensation, out of profits derived from the Adviser’s management fee and not as an additional charge to the Funds, to certain financial institutions (which may include banks, securities dealers and other industry professionals) for the sale and/or distribution of Funds shares or the retention and/or servicing of Funds investors and Fund shares (“revenue sharing”). These payments are in addition to any distribution or servicing fees payable under a service plan of the Funds, any record keeping or sub-transfer agency fees payable by the Funds, or other fees described in the fee table or elsewhere in the Prospectus or SAI. Examples of “revenue sharing” payments include, but are not limited to, payment to financial institutions for “shelf space” or access to a third party platform or fund offering list or other marketing programs, including, but not limited to, inclusion of the Funds on preferred or recommended sales lists, mutual fund “supermarket” platforms and other formal sales programs; granting the Adviser access to the financial institution’s sales force; granting the Adviser access to the financial institution’s conferences and meetings; assistance in training and educating the financial institution’s personnel; and obtaining other forms of marketing support. The level of revenue sharing payments made to financial institutions may be a fixed fee or based upon one or more of the following factors; gross sales, current assets and/or number of accounts of the Funds attributable to the financial institution, or other factors as agreed to by the Adviser and the financial institution or any combination thereof. The amount of these revenue sharing payments is determined at the discretion of the Adviser from time to time, may be substantial, and may be different for different financial institutions depending upon the services provided by the financial institution. Such payments may provide an incentive for the financial institution to make shares of the Funds available to its customers and may allow the Funds greater access to the financial institution’s customers.

Prior Performance of Similarly Advised Accounts

The Funds’ respective portfolio managers are employees of both SAM and SAM’s affiliate, SAM AG. The tables below present past performance information for the SAM Sustainable Global Active Composite (the “Global Active Composite”) and the SAM Sustainable Themes Composite (the “Themes Composite”). The Global Active Composite consists of all separate accounts and/or commingled accounts managed by the Sustainable Global Active Fund’s portfolio managers on behalf of SAM AG in a substantially similar manner as the Sustainable Global Active Fund. The Themes Composite consists of all separate accounts and/or commingled accounts managed by the Sustainable Themes Fund’s portfolio managers on behalf of SAM AG in a substantially similar manner as the Sustainable Themes Fund. All of the accounts comprising the Global Active Composite have substantially similar investment objectives, policies and strategies as the Sustainable Global Active Fund. All of the accounts comprising the Themes Composite have substantially similar investment objectives, policies and strategies as the Sustainable Themes Fund.

The information is provided to illustrate the past performance of the Funds’ respective portfolio managers in managing substantially similar accounts and does not represent the performance of the Sustainable Global Active Fund or the Sustainable Themes Fund. Investors should not consider this performance information as a substitute for the performance of the Sustainable Global Active Fund or the Sustainable Themes Fund, nor should investors consider this information as an indication of the future performance of the Sustainable Global Active Fund or the Sustainable Themes Fund or of SAM or of SAM AG. The overall expenses of the accounts in the Global Active Composite are generally lower than those that would be experienced by the holders of Institutional Class shares of the Sustainable Global Active Fund and, therefore, the performance of the Institutional Class shares of the Sustainable Global Active Fund would generally be lower. The overall expenses of the accounts in the Themes Composite are generally equal to those that would be experienced by the holders of Institutional Class shares of the Sustainable Themes Fund and, therefore, the performance of the Institutional Class shares of the Sustainable Themes Fund would generally be equivalent. However, the Sustainable Global Active Fund’s and the Sustainable Themes Fund’s results in the future also may be different because the accounts in the Global Active Composite and Themes Composite, respectively, are not subject to certain investment limitations, diversification requirements and other restrictions imposed on mutual funds under applicable U.S. securities and tax laws that, if applicable, could have adversely affected the performance of the accounts in the Global Active Composite and the Themes Composite. In addition, the securities held by the Sustainable Global Active Fund and the Sustainable Themes Fund will not be identical to the securities held by the accounts in the Global

- 17 -

Active Composite and Themes Composite, respectively. The performance of each Composite is also compared to the performance of a broad-based securities benchmark index appropriate to both the Sustainable Global Active Fund and the Sustainable Themes Fund. The index is unmanaged and is not subject to fees and expenses typically associated with managed funds, including the Sustainable Global Active Fund and the Sustainable Themes Fund. Investors cannot invest directly in the index. The performance information is accompanied by additional disclosures, which are an integral part of the information.

- 18 -

SAM SUSTAINABLE GLOBAL ACTIVE COMPOSITE

(Returns as of November 30, 2008)

- 19 -

- 20 -

Other Service Providers

The following chart shows the Funds’ service providers and includes their addresses and principal activities.

- 21 -

SHAREHOLDER INFORMATION

Pricing of Fund Shares

Institutional Class shares of the Funds (“Shares”) are priced at their net asset value (“NAV”). The NAV per share of each Fund is calculated as follows:

The Funds’ NAV is calculated once daily at the close of regular trading hours on the New York Stock Exchange (“NYSE”) (generally 4:00 p.m. Eastern time) on each day the NYSE is open. The NYSE is generally open Monday through Friday, except national holidays. Each Fund will effect purchases of Fund shares at the NAV next determined after receipt of your order or request in proper form. Each Fund will effect redemptions of Fund shares at the NAV next calculated after receipt of your order in proper form.

The Funds’ equity securities listed on any national or foreign exchange market system will be valued at the last sale price, except for the National Association of Securities Dealers Automatic Quotation System (“NASDAQ”). Equity securities listed on NASDAQ will be valued at the official closing price. Equity securities traded in the over-the-counter market are valued at their closing prices. If there were no transactions on that day, securities traded principally on an exchange or on NASDAQ will be valued at the mean of the last bid and ask prices prior to the market close. Fixed income securities having a remaining maturity of 60 days or less are valued at amortized cost, which approximates market value. Fixed income securities having a remaining maturity of greater than 60 days are valued using an independent pricing service. When prices are not available from such services or are deemed to be unreliable, securities may be valued by dealers who make markets in such securities. Foreign securities, currencies and other securities denominated in foreign currencies are translated into U.S. dollars at the exchange rate of such currencies against the U.S. dollar provided by a pricing service. All assets denominated in foreign currencies will be converted into U.S. dollars at the exchange rates in effect at the time of valuation. If a Fund holds foreign equity securities, the calculation of the Funds’ NAV will not occur at the same time as the determination of the value of the foreign equities securities in the Funds’ portfolio, since these securities are traded on foreign exchanges.

If market quotations are unavailable or deemed unreliable, securities will be valued in accordance with procedures adopted by the Company’s Board of Directors. In addition, the prices of foreign securities may be affected by events that occur after the close of a foreign market but before the Fund prices its shares. In such instances, a foreign security may be fair valued in accordance with procedures adopted by the Company’s Board of Directors. Relying on prices supplied by pricing services or dealers or using fair valuation involves the risk that the values used by a Fund to price its investments may be higher or lower than the values used by other investment companies and investors to price the same investments.

Investments in other open-end investment companies are valued based on the NAV of those investment companies (which may use fair value pricing as discussed in their prospectuses).

Market Timing

In accordance with the policy adopted by the Company’s Board of Directors, the Company discourages market timing and other excessive trading practices. Purchases should be made with a view to longer-term investment only. Excessive short-term (market timing) trading practices may disrupt portfolio management strategies, increase brokerage and administrative costs, harm Fund performance and result in dilution in the value of Fund shares held by long-term shareholders. The Company and the Adviser reserve the right to reject or restrict purchase requests from any investor. The Company and the Adviser will not be liable for any loss resulting from rejected purchase orders. To minimize harm to the Company and its shareholders (or the Adviser), the Company (or the Adviser) will exercise their right if, in the

- 22 -

Company’s (or the Adviser’s) judgment, an investor has a history of excessive trading or if an investor’s trading, in the judgment of the Company or the Adviser, has been or may be disruptive to the Fund. No waivers of the provisions of the policy established to detect and deter market timing and other excessive trading activity are permitted that would harm a Fund and its shareholders or would subordinate the interests of a Fund and its shareholders to those of the Adviser or any affiliated person or associated person of the Adviser.

To deter excessive shareholder trading, the Funds generally charge a redemption fee of 1% on shares redeemed within 60 days of purchase. In addition, the Funds generally limits the number of exchanges to six (6) times per year (one exchange per calendar month). For further information on redemptions and exchanges, please see the sections titled “Shareholder Information — Redemption of Fund Shares” and “Shareholder Information — Exchange Privilege.”

Pursuant to the policy adopted by the Board of Directors, the Adviser has developed criteria that they use to identify trading activity that may be excessive. The Adviser reviews on a regular, periodic basis available information related to the trading activity in the Funds in order to assess the likelihood that a Fund may be the target of excessive trading. As part of its excessive trading surveillance process, the Adviser, on a periodic basis, examines transactions that exceed certain monetary thresholds or numerical limits within a period of time (see “Exchange Privilege” below). If, in its judgment, an Adviser detects excessive, short-term trading, the Adviser may reject or restrict a purchase request and may further seek to close an investor’s account with a Fund. The Adviser may modify its surveillance procedures and criteria from time to time without prior notice regarding the detection of excessive trading or to address specific circumstances. The Adviser will apply the criteria in a manner that, in the Adviser’s judgment, will be uniform. There is no assurance that an Adviser will be able to identify market timers, particularly if they are investing through intermediaries.

If necessary, the Company may prohibit additional purchases of Fund shares by a financial intermediary or by certain customers of the financial intermediary. Financial intermediaries may also monitor their customers’ trading activities in the Company. The criteria used by intermediaries to monitor for excessive trading may differ from the criteria used by the Company. If a financial intermediary fails to enforce the Company’s excessive trading policies, the Company may take certain actions, including terminating the relationship.

Purchase of Fund Shares

Shares representing interests in the Funds are offered continuously for sale by PFPC Distributors, Inc. (the “Distributor”).

Institutional Class Shares of the Funds are available for purchase by the following categories of investors:

Investors who meet the above investor eligibility criteria are eligible to purchase Institutional Class shares. Existing shareholders who opened their Institutional Class share accounts in the Funds prior to November 7, 2008 will be eligible to maintain such accounts and to make additional purchases in such accounts.

An exchange between the Institutional Class shares and the Investor Class shares of any Fund is generally not permitted, except that Institutional Class shares will be exchanged for Investor Class shares automatically should an investor in the Institutional Class shares who opened an account after November 7, 2008 no longer meets the investor eligibility requirements set forth above. The involuntary exchange will take place at net asset value, without the imposition of a sales load, exchange fee or other charge.

- 23 -

Under Internal Revenue Code section 1036, an exchange of shares of one class for shares of another class constitutes a nontaxable exchange for federal income tax purposes, and your basis and holding period for your existing shares will carry over to your new shares. The Funds intend to report the exchange as an entirely nontaxable transaction. It is possible, however, for you to recognize dividend income as a result of the exchange due to differences in the expense ratios between the two classes, but the amount of any such income would not exceed the value of any additional shares that you receive in the transaction.

Purchases Through Intermediaries. Shares of the Funds may also be available through certain brokerage firms, financial institutions and other industry professionals (collectively, “Service Organizations”). Certain features of the Shares, such as the initial and subsequent investment minimums and certain trading restrictions, may be modified or waived by Service Organizations. Service Organizations may impose transaction or administrative charges or other direct fees, which charges and fees would not be imposed if Shares are purchased directly from the Company. Therefore, you should contact the Service Organization acting on your behalf concerning the fees (if any) charged in connection with a purchase or redemption of Shares and should read this Prospectus in light of the terms governing your accounts with the Service Organization. Service Organizations will be responsible for promptly transmitting client or customer purchase and redemption orders to the Company in accordance with their agreements with the Company and with clients or customers. Service Organizations or, if applicable, their designees that have entered into agreements with the Company or its agent may enter confirmed purchase orders on behalf of clients and customers, with payment to follow no later than the Company’s pricing on the following Business Day. If payment is not received by such time, the Service Organization could be held liable for resulting fees or losses. The Company will be deemed to have received a purchase or redemption order when a Service Organization, or, if applicable, its authorized designee, accepts a purchase or redemption order in good order if the order is actually received by the Company in good order not later than the next business morning. If a purchase order is not received by a Fund in good order, PNC Global Investment Servicing. (the “Transfer Agent”) will contact the financial intermediary to determine the status of the purchase order. Orders received by the Company in good order will be priced at each Fund’s NAV next computed after they are deemed to have been received by the Service Organization or its authorized designee.

The Company relies upon the integrity of Service Organizations to ensure that orders are timely and properly submitted. The Funds cannot assure you that a Service Organization properly submitted to it all purchase and redemption orders received from the Service Organization’s customers before the time for determination of a Fund’s NAV in order to obtain that day’s price.

For administration, subaccounting, transfer agency and/or other services, the Adviser, the Distributor or their affiliates may pay Service Organizations and certain recordkeeping organizations a fee (the “Service Fee”) of the average annual NAV of accounts with the Company maintained by such Service Organizations or recordkeepers. The Service Fee payable to any one Service Organization is determined based upon a number of factors, including the nature and quality of services provided, the operations processing requirements of the relationship and the standardized fee schedule of the Service Organization or recordkeeper.

General. You may also purchase Shares of the Funds at the NAV per share next calculated after your order is received by the Transfer Agent in proper form as described below. After an initial purchase is made, the Transfer Agent will set up an account for you on the Company records. The minimum initial investment in each Fund is $100,000 and the minimum additional investment is $5000. The minimum initial and subsequent investment requirements may be reduced or waived from time to time. For purposes of meeting the minimum initial purchase, purchases by clients which are part of endowments, foundations or other related groups may be combined. You can only purchase Shares of a Fund on days the NYSE is open and through the means described below. Shares may be purchased by principals and employees of the Adviser and its subsidiaries and by their spouses and children either directly or through any trust that has the principal, employee, spouse or child as the primary beneficiaries, their individual retirement accounts, or any pension and profit-sharing plan of the Adviser and its subsidiaries without being subject to the minimum investment limitations.

Initial Investment By Mail. An account may be opened by completing and signing the application included with this Prospectus and mailing it to the Transfer Agent at the address noted below, together with a check ($100,000 minimum) payable to the Fund in which you would like to invest. Third party checks will not be accepted.

- 24 -

The name of the Fund should be designated on the application and should appear on the check.

Payment for the purchase of Shares received by mail will be credited to a shareholder’s account at the NAV per share of the Fund next determined after receipt of payment in good order.

Initial Investment By Wire. Shares of the Funds may be purchased by wiring federal funds to PNC Bank, N.A. (see instructions below). A completed application must be forwarded to the Transfer Agent at the address noted above

under “Initial Investment by Mail” in advance of the wire. For each Fund, notification must be given to the Transfer

Agent at (888) 261-4073 prior to 4:00 p.m., Eastern time, on the wire date. (Prior notification must also be received

from investors with existing accounts.) Request account information and routing instructions by calling the Transfer

Agent at (888) 261-4073. Funds should be wired to:

PNC Bank, N.A.

Philadelphia, Pennsylvania 19103

ABA# 0310-0005-3

Account # 86-1108-2507

F/B/O [name of fund]

Ref. (Account Number)

Shareholder or Account Name

Federal fund wire purchases will be accepted only on days when the NYSE and PNC Bank, N.A. are open for business.

Additional Investments. Additional investments may be made at any time (minimum additional investment $5000) by purchasing Shares of a Fund at the NAV per Share of the Fund by mailing a check to the Transfer Agent at the address noted under “Initial Investment by Mail” (payable to SAM Sustainable Global Active Fund or SAM Sustainable Themes Fund, respectively) or by wiring monies to PNC Bank, N.A. as outlined under “Initial Investment by Wire.” For each Fund, notification must be given to the Transfer Agent at (888) 261-4073 prior to 4:00 p.m., Eastern time, on the wire date. Initial and additional purchases made by check cannot be redeemed until payment of the purchase has been collected. This may take up to 15 calendar days from the date of purchase.

Automatic Investment Plan. Additional investments in Shares of the Funds may be made automatically by authorizing the Transfer Agent to withdraw funds from your bank account through an Automatic Investment Plan ($5000 minimum). Investors desiring to participate in an Automatic Investment Plan should call the Transfer Agent at (888) 261-4073.

Retirement Plans. Shares may be purchased in conjunction with individual retirement accounts (“IRAs”) and rollover IRAs where PFPC Trust Company acts as custodian. A $15.00 custodial maintenance fee is charged per IRA account per year. For further information as to applications and annual fees, contact the Transfer Agent at (888) 261- 4073. To determine whether the benefits of an IRA are available and/or appropriate, you should consult with a tax advisor.

Other Purchase Information. The Company reserves the right, in its sole discretion, to suspend the offering of Shares or to reject purchase orders when, in the judgment of management, such suspension or rejection is in the best interests of the Funds. Subject to Board of Directors’ discretion, SAM will monitor the Funds’ total assets and may decide to close a Fund at any time to new investments or to new accounts due to concerns that a significant increase in the size of the Fund may adversely affect the implementation of the Fund’s strategy. Subject to Board of Directors’ discretion, SAM may also choose to reopen a closed Fund to new investments at any time, and may subsequently close the Fund again should concerns regarding the Fund’s size recur. If a Fund closes to new investments, generally the closed Fund would be offered only to certain existing shareholders of the Fund and certain other persons, who are generally subject to cumulative, maximum purchase amounts, as follows:

a. Persons who already hold Shares of the closed Fund directly or through accounts maintained by brokers by

- 25 -

arrangement with the Company;

b. Existing and future clients of financial advisers and planners whose clients already hold Shares of the closed Fund;

c. Employees of the Adviser and their spouses, parents and children; and

d. Directors of the Company.

Other persons who are shareholders of other Robeco Funds are not permitted to acquire Shares of the closed Fund by exchange. Distributions to all shareholders of the closed Fund will continue to be reinvested unless a shareholder elects otherwise. The Adviser, subject to the Board of Directors’ discretion, reserves the right to implement other purchase limitations at the time of closing, including limitations on current shareholders.

Purchases of the Funds’ Shares will be made in full and fractional shares of the Funds calculated to three decimal places.

The Company’s officers are authorized to waive the minimum initial and subsequent investment requirements.

Good Order. You must include complete and accurate required information on your purchase request. Please see “Purchase of Fund Shares” for instructions. Purchase requests not in good order may be rejected.

Customer Identification Program. Federal law requires the Company to obtain, verify and record identifying information, which may include the name, residential or business street address, date of birth (for an individual), social security or taxpayer identification number or other identifying information for each investor who opens or reopens an account with the Company. Applications without the required information, or without any indication that a social security or taxpayer identification number has been applied for, may not be accepted. After acceptance, to the extent permitted by applicable law or its customer identification program, the Company reserves the right (a) to place limits on transactions in any account until the identity of the investor is verified; or (b) to refuse an investment in a Company portfolio or to involuntarily redeem an investor’s Shares and close an account in the event that an investor’s identity is not verified. The Company and its agents will not be responsible for any loss in an investor’s account resulting from the investor’s delay in providing all required identifying information or from closing an account and redeeming an investor’s Shares when an investor’s identity cannot be verified.

Redemption of Fund Shares

Normally, your investment firm will send your request to redeem Shares to the Funds’ transfer agent. Consult your investment professional for more information. You can redeem some or all of your Fund shares directly through the Fund only if the account is registered in your name. All IRA shareholders must complete an IRA withdrawal form to redeem shares from their IRA account.

You may redeem Shares of each Fund at the next NAV calculated after a redemption request is received by the Transfer Agent in proper form. You can only redeem Shares on days the NYSE is open and through the means described below.

You may redeem Shares of a Fund by mail, or, if you are authorized, by telephone (excluding retirement accounts where PFPC Trust Company acts as custodian). The value of Shares redeemed may be more or less than the purchase price, depending on the market value of the investment securities held by a Fund. There is generally no charge for a redemption. However, with the exception of defined contribution plans, if a shareholder of the Fund redeems Shares held for less than 60 days, a transaction fee of 1% of the NAV of the Shares redeemed at the time of redemption will be charged. For purposes of this redemption feature, Shares purchased first will be considered to be Shares first redeemed.

Redemption By Mail. Your redemption requests should be addressed to SAM Sustainable Global Active Fund or SAM Sustainable Themes Fund, c/o PNC Global Investment Servicing, P.O. Box 9816, Providence, RI 02940; for

- 26 -

overnight delivery, requests should be addressed to SAM Sustainable Global Active Fund or SAM Sustainable Themes Fund, c/o PNC Global Investment Servicing, 101 Sabin Street, Pawtucket, RI 02860-1427 and must include:

a. Name of the Fund;

b. Account number;

c. Your share certificates, if any, properly endorsed or with proper powers of attorney;

d. A letter of instruction specifying the number of Shares or dollar amount to be redeemed, signed by all registered owners of the Shares in the exact names in which they are registered;

e. Medallion signature guarantees are required when (i) the redemption proceeds are to be sent to someone other than the registered shareholder(s) or (ii) the redemption request is for $10,000 or more. A signature guarantee may be obtained from a domestic bank or trust company, broker, dealer, clearing agency or savings association who are participants in a Medallion Program recognized by the Securities Transfer Association. The three recognized Medallion Programs are Securities Transfer Agent Medallion Program (STAMP), Stock Exchanges Medallion Program (SEMP) and New York Stock Exchange, Inc. Medallion Program (MSP). Signature guarantees which are not a part of these programs will not be accepted. Please note that a notary public stamp or seal is not acceptable; and

f. Other supporting legal documents, if required, in the case of estates, trusts, guardianships, custodianships, corporations, pension and profit sharing plans and other organizations.

Redemption By Telephone. In order to request a telephone redemption, you must have returned your account application containing a telephone election. To add a telephone redemption option to an existing account, contact the Transfer Agent by calling (888) 261-4073. Please note that IRA accounts are not eligible for telephone redemption.

Once you are authorized to utilize the telephone redemption option, a redemption of Shares may be requested by calling the Transfer Agent at (888) 261-4073 and requesting that the redemption proceeds be mailed to the primary registration address or wired per the authorized instructions. A wire charge of $7.50 is assessed and charged to the shareholder. If the telephone redemption option or the telephone exchange option is authorized, the Transfer Agent may act on telephone instructions from any person representing himself or herself to be a shareholder and believed by the Transfer Agent to be genuine. The Transfer Agent’s records of such instructions are binding and shareholders, not the Company or the Transfer Agent, bear the risk of loss in the event of unauthorized instructions reasonably believed by the Company or the Transfer Agent to be genuine. The Company and the Transfer Agent will employ reasonable procedures to confirm that instructions communicated are genuine and, if it does not, it may be liable for any losses due to unauthorized or fraudulent instructions. The procedures employed by the Company and the Transfer Agent in connection with transactions initiated by telephone include tape recording of telephone instructions and requiring some form of personal identification prior to acting upon instructions received by telephone.

Systematic Withdrawal Plan. If your account has a value of at least $10,000, you may establish a Systematic Withdrawal Plan and receive regular periodic payments. A request to establish a Systematic Withdrawal Plan must be submitted in writing to the Transfer Agent at P.O. Box 9816, Providence, RI 02940. Each withdrawal redemption will be processed on or about the 25th of the month and mailed as soon as possible thereafter. There are no service charges for maintenance; the minimum amount that you may withdraw each period is $100. (This is merely the minimum amount allowed and should not be mistaken for a recommended amount.) The holder of a Systematic Withdrawal Plan will have any income dividends and any capital gains distributions reinvested in full and fractional shares at NAV. To provide funds for payment, Shares will be redeemed in such amounts as are necessary at the redemption price. The systematic withdrawal of Shares may reduce or possibly exhaust the Shares in your account, particularly in the event of a market decline. As with other redemptions, a systematic withdrawal payment is a sale for federal income tax purposes. Payments made pursuant to a Systematic Withdrawal Plan cannot be considered as actual yield or income since part of such payments may be a return of capital.

You will ordinarily not be allowed to make additional investments of less than the aggregate annual withdrawals under the Systematic Withdrawal Plan during the time you have the plan in effect and, while a Systematic Withdrawal

- 27 -

Plan is in effect, you may not make periodic investments under the Automatic Investment Plan. You will receive a confirmation of each transaction and the Share and cash balance remaining in your plan. The plan may be terminated on written notice by the shareholder or by the Funds and will terminate automatically if all Shares are liquidated or withdrawn from the account or upon the death or incapacity of the shareholder. You may change the amount and schedule of withdrawal payments or suspend such payments by giving written notice to the Funds’ transfer agent at least ten Business Days prior to the end of the month preceding a scheduled payment.

Transaction Fee on Certain Redemptions

The Funds require the payment of a transaction fee on redemption of Shares held for less than 60 days equal to 1.00% of the NAV of such Shares redeemed at the time of redemption. This additional transaction fee is paid to the Funds, NOT to the Adviser, Distributor or Transfer Agent. It is NOT a sales charge or a contingent deferred sales charge. The fee does not apply to defined contribution plans or to redeemed Shares that were purchased through reinvested dividends or capital gain distributions. The additional transaction fee is intended to limit short-term trading in the Fund or, to the extent that short-term trading persists, to impose the costs of that type of activity on the shareholders who engage in it. These costs include: (i) brokerage costs; (ii) market impact costs — i.e., the decrease in market prices which may result when a Fund sells certain securities in order to raise cash to meet the redemption request; (iii) the realization of capital gains by the other shareholders in the Fund; and (iv) the effect of the “bid-ask” spread in the over-the-counter market. The transaction fee represents a Fund’s estimate of the brokerage and other transaction costs which may be incurred by the Fund in disposing of stocks in which the Fund may invest. Without the additional transaction fee, a Fund would generally be selling its shares at a price less than the cost to the Fund of acquiring the portfolio securities necessary to maintain its investment characteristics, resulting in reduced investment performance for all shareholders in the Fund. With the additional transaction fee, the transaction costs of selling additional stocks are not borne by all existing shareholders, but the source of funds for these costs is the transaction fee paid by those investors making redemptions of the Fund. Each Fund reserves the right, at their discretion, to waive, modify or terminate the additional transaction fee.

The Funds will use the first-in, first-out method to determine your holding period. Under this method, the date of redemption or exchange will be compared with the earliest purchase date of Shares held in your account. The short-term redemption fee will be assessed on the net asset value of those Shares calculated at the time the redemption is effected.

Involuntary Redemption. The Funds reserve the right to redeem a shareholder’s account in any Fund at any time the value of the account in the Fund falls below $500 as the result of a redemption or an exchange request. Shareholders will be notified in writing that the value of their account in the Fund is less than $500 and will be allowed 30 days to make additional investments before the redemption is processed. The transaction fee applicable to each Fund will not be charged when Shares are involuntarily redeemed.

Other Redemption Information. Redemption proceeds for Shares of a Fund recently purchased by check may not be distributed until payment for the purchase has been collected, which may take up to fifteen days from the purchase date. Shareholders can avoid this delay by utilizing the wire purchase option.

Other than as described above, payment of the redemption proceeds will be made within seven days after receipt of an order for a redemption. The Company may suspend the right of redemption or postpone the date at times when the NYSE is closed or under any emergency circumstances as determined by the SEC.

If the Board of Directors determines that it would be detrimental to the best interests of the remaining shareholders of a Fund to make payment wholly or partly in cash, redemption proceeds may be paid in whole or in part by an in-kind distribution of readily marketable securities held by the Fund instead of cash in conformity with applicable rules of the SEC. Investors generally will incur brokerage charges on the sale of portfolio securities so received in the payment of redemptions. The Company has elected, however, to be governed by Rule 18f-1 under the 1940 Act, so that each Fund is obligated to redeem its Shares solely in cash up to the lesser of $250,000 or 1% of its NAV during any 90-day period for any one shareholder of the Fund.

Proper Form. You must include complete and accurate required information on your redemption request. Please see “Redemption of Fund Shares” for instructions. Redemption requests not in proper form may be delayed.

- 28 -

Exchange Privilege

The exchange privilege is available to shareholders residing in any state in which the Shares being acquired may be legally sold. A shareholder may exchange Institutional Class Shares of any Robeco Investment Fund for Institutional Class Shares of another Robeco Investment Fund, up to six (6) times per year (one exchange per calendar month). Such an exchange will be effected at the NAV of the exchanged Institutional Class Shares and the NAV of the Institutional Class Shares to be acquired next determined after PNC Global Investment Servicing’s receipt of a request for an exchange. An exchange of Fund Shares held for less than 60 days (with the exception of Shares purchased through dividend reinvestment or the reinvestment of capital gains) will be subject to a transaction fee of 1.00%. An exchange of Shares will be treated as a sale for federal income tax purposes. A shareholder may make an exchange by sending a written request to the Transfer Agent or, if authorized, by telephone (see “Redemption by Telephone” above). Defined contribution plans are not subject to the above exchange limitations, including any applicable redemption fee.

If the exchanging shareholder does not currently own Institutional Class Shares of a Fund, a new account will be established with the same registration, dividend and capital gain options as the account from which Shares are exchanged, unless otherwise specified in writing by the shareholder with all signatures guaranteed. See “Redemption by Mail” for information on signature guarantees. The exchange privilege may be modified or terminated at any time, or from time to time, by a Fund, upon 60 days’ written notice to shareholders.

If a shareholder wants to exchange shares into a new account in a Fund, the dollar value of the Shares acquired must equal or exceed the Fund’s minimum investment requirement for a new account. If a shareholder wants to exchange shares into an existing account, the dollar value of the shares must equal or exceed the Fund’s minimum investment requirement for additional investments. If an amount remains in a Fund from which the exchange is being made that is below the minimum account value required, the account will be subject to involuntary redemption.

The Funds’ exchange privilege is not intended to afford shareholders a way to speculate on short-term movements in the market. Accordingly, in order to prevent excessive use of the exchange privilege, which may potentially disrupt the management of a Fund and increase transaction costs, each Fund has established a policy of limiting excessive exchange activity. Shareholders are entitled to six (6) exchange redemptions (one exchange per calendar month) from each Fund during any twelve-month period. Notwithstanding these limitations, each Fund reserves the right to reject any purchase request (including exchange purchases from other Robeco Investment Funds) that is deemed to be disruptive to efficient portfolio management.

Dividends and Distributions

Each Fund will distribute substantially all of its net investment income and net realized capital gains, if any, to its shareholders. All distributions are reinvested in the form of additional full and fractional Shares of the Fund unless a shareholder elects otherwise.

Each Fund will declare and pay dividends from net investment income annually. Ordinary income for the Funds in certain circumstances may be “qualified dividend income” taxable to individual shareholders at a maximum 15% U.S. federal income tax rate. Net realized capital gains (including net short-term capital gains), if any, will be distributed by the Funds at least annually. The estimated amount of any annual distribution will be posted to Robeco’s website at www.robecoinvest.com or a free copy may be obtained by calling (888) 261-4073.

The Funds may pay additional distributions and dividends at other times if necessary for the Fund to avoid U.S. federal tax. The Funds’ distributions and dividends, whether received in cash or reinvested in additional Fund Shares, are subject to U.S. federal income tax.

Taxes

The following is a summary of certain United States tax considerations relevant under current law, which may be subject to change in the future. Except where otherwise indicated, the discussion relates to investors who are individual United States citizens or residents. You should consult your tax adviser for further information regarding federal, state, local and/or foreign tax consequences relevant to your specific situation.

- 29 -

Federal Taxes. Each Fund contemplates distributing as dividends each year all or substantially all of its taxable income, including its net capital gain (the excess of net long-term capital gain over net short-term capital loss). Except as otherwise discussed below, you will be subject to federal income tax on Fund distributions regardless whether they are paid in cash or reinvested in additional shares. Fund distributions attributable to short-term capital gains and net investment income will generally be taxable to you as ordinary income, except as discussed below.

Distributions attributable to the net capital gain of a Fund will be taxable to you as long-term capital gain, no matter how long you have owned your Fund shares. The maximum long-term capital gain rate applicable to individuals, estates, and trusts is currently 15%. You will be notified annually of the tax status of distributions to you.

Distributions of “qualifying dividends” will also generally be taxable to you at long-term capital gain rates, as long as certain requirements are met. In general, if 95% or more of the gross income of a Fund (other than net capital gain) consists of dividends received from domestic corporations or “qualified” foreign corporations (“qualifying dividends”), then all distributions paid by the Fund to individual shareholders will be taxed at long-term capital gains rates. But if less than 95% of the gross income of a Fund (other than net capital gain) consists of qualifying dividends, then distributions paid by the Fund to individual shareholders will be qualifying dividends only to the extent they are derived from qualifying dividends earned by the Fund. For the lower rates to apply, you must have owned your Fund shares for at least 61 days during the 121-day period beginning on the date that is 60 days before the Fund’s ex-dividend date (and the Fund will need to have met a similar holding period requirement with respect to the shares of the corporation paying the qualifying dividend). The amount of a Fund’s distributions that qualify for this favorable treatment may be reduced as a result of the Fund’s securities lending activities (if any), a high portfolio turnover rate or investments in debt securities or “non-qualified” foreign corporations.

Distributions from a Fund will generally be taxable to you in the taxable year in which they are paid, with one exception. Distributions declared by a Fund in October, November or December and paid in January of the following year are taxed as though they were paid on December 31.

A portion of distributions paid by a Fund to shareholders that are corporations may also qualify for the dividends- received deduction for corporations, subject to certain holding period requirements and debt financing limitations.

The Funds may be subject to foreign withholding or foreign taxes on income or gain from certain foreign securities. If more than 50% of the assets of a Fund consist of foreign securities, that Fund may make an election to treat a proportionate amount of those taxes as constituting a distribution to each shareholder, which would allow you either (i) to credit that proportionate amount of taxes against U.S. Federal income tax liability as a foreign tax credit or (ii) to take that amount as an itemized deduction.

If you purchase shares just before a distribution, the purchase price will reflect the amount of the upcoming distribution, but you will be taxed on the entire amount of the distribution received, even though, as an economic matter, the distribution simply constitutes a return of capital. This is known as “buying into a dividend.”

Sales and Exchanges. You will generally recognize taxable gain or loss for federal income tax purposes on a sale, exchange or redemption of your shares, including an exchange for shares of another Fund, based on the difference between your tax basis in the shares and the amount you receive for them. Generally, you will recognize long-term capital gain or loss if you have held your Fund shares for over twelve months at the time you dispose of them. (To aid in computing your tax basis, you should retain your account statements for the periods during which you held shares.)

Any loss realized on shares held for six months or less will be treated as a long-term capital loss to the extent of any capital gain dividends that were received on the shares. Additionally, any loss realized on a disposition of shares of a Fund may be disallowed under “wash sale” rules to the extent the shares disposed of are replaced with other shares of the same Fund within a period of 61 days beginning 30 days before and ending 30 days after the shares are disposed of, such as pursuant to a dividend reinvestment in shares of a Fund. If disallowed, the loss will be reflected in an upward adjustment to the basis of the shares acquired.

IRAs and Other Tax-Qualified Plans. The one major exception to the preceding tax principles is that distributions on, and sales, exchanges and redemptions of, shares held in an IRA (or other tax-qualified plan) will not be currently taxable.

- 30 -

Backup Withholding. The Funds may be required in certain cases to withhold and remit to the Internal Revenue Service a percentage of taxable dividends or gross proceeds realized upon sale payable to shareholders who have failed to provide a correct tax identification number in the manner required, or who are subject to withholding by the Internal Revenue Service for failure to properly include on their return payments of taxable interest or dividends, or who have failed to certify to the Fund that they are not subject to backup withholding when required to do so or that they are “exempt recipients.” The current withholding rate is 28%.

U.S. Tax Treatment of Foreign shareholders. For nonresident aliens, foreign corporations and other foreign investors, Fund distributions attributable to net capital gains of each Fund will generally be exempt from U.S. tax, but all other Fund distributions will generally be subject to a 30% withholding tax. The withholding tax may, however, be reduced (and, in some cases, eliminated) under an applicable tax treaty between the United States and a shareholder’s country of residence or incorporation, provided that the shareholder furnishes the Fund with a properly completed Form W-8BEN to establish entitlement for these treaty benefits.

Foreign shareholders will generally not be subject to U.S. tax on gains realized on sale, exchange or redemption of shares in the Funds.

Different U.S. tax rules may apply to a foreign shareholder, however, if the investment in Fund is connected to a trade or business of the shareholder in the United States or the shareholder is present in the United States for 183 days or more in a year.

All foreign investors should consult their own tax advisors regarding the tax consequences in their country of residence of an investment in the Fund.

State and Local Taxes. You may also be subject to state and local taxes on income and gain from Fund shares. State income taxes may not apply, however, to the portions of a Fund’s distributions, if any, that are attributable to interest on U.S. government securities. You should consult your tax adviser regarding the tax status of distributions in your state and locality.

Sunset of Tax Provisions. Some of the tax provisions described above are subject to sunset provisions. Specifically, a sunset provision provides that the 15% long-term capital gain rate and the taxation of dividends at the long-term capital gain rate will change after 2010.

More information about taxes is contained in the SAI.

Multi-Class Structure

The Funds also offer Investor Class Shares, which are offered directly to individual investors in a separate prospectus. Shares of each class of a Fund represent equal pro rata interests in the Fund and accrue dividends and calculate NAV and performance quotations in the same manner. The performance of each class is quoted separately due to different actual expenses. The total return on Institutional Class Shares of a Fund can be expected to differ from the total return on Investor Class Shares of the same Fund. Information concerning other classes of the Funds can be requested by calling the Funds at (888) 261-4073.

NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR MAKE ANY REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS OR IN THE FUNDS’ SAI INCORPORATED HEREIN BY REFERENCE, IN CONNECTION WITH THE OFFERING MADE BY THIS PROSPECTUS AND, IF GIVEN OR MADE, SUCH REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY OR ITS DISTRIBUTOR. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY THE COMPANY OR BY THE DISTRIBUTOR IN ANY JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY BE MADE.

- 31 -

ROBECO INVESTMENT FUNDS

of

The RBB Fund, Inc.

(888) 261-4073

http://www.robecoinvest.com

For More Information:

This Prospectus contains important information you should know before you invest. Read it carefully and keep it for future reference. More information about the SAM Sustainable Global Active Fund and SAM Sustainable Themes Fund is available free of charge, upon request, including:

Annual/Semi–Annual Reports

These reports contain additional information about the Funds’ investments, describe the Funds’ performance, list portfolio holdings, and discuss recent market conditions and economic trends. The annual report includes fund strategies that significantly affected the Funds’ performance during their last fiscal year. When available, the annual and semi-annual reports to shareholders may be obtained by visiting http://www.robecoinvest.com.

Statement of Additional Information

An SAI, dated [                        ], 2009 has been filed with the SEC. The SAI, which includes additional information about the SAM Sustainable Global Active Fund and SAM Sustainable Themes Fund, may be obtained free of charge, along with the annual and semi–annual reports, when available, by calling (888) 261-4073. The SAI, as supplemented from time to time, is incorporated by reference into this prospectus (and is legally part of the prospectus). The SAI is not available on the Adviser’s website because a copy may be obtained by calling (888) 261-4073.

Shareholder Inquiries

Representatives are available to discuss account balance information, mutual fund prospectuses, literature, programs and services available. Hours: 8 a.m. to 6 p.m. (Eastern time) Monday–Friday. Call: (888) 261-4073 or visit the website of Robeco Investment Management at http://www.robecoinvest.com.

Purchases and Redemptions

Call (888) 261-4073.

Written Correspondence

Street Address:

Robeco Investment Funds, c/o PNC Global Investment Servicing, 101 Sabin Street, Pawtucket, RI 02860-1427 P.O. Box Address:

Robeco Investment Funds, c/o PNC Global Investment Servicing, P.O. Box 9816, Providence, RI 02940

Securities and Exchange Commission

You may view and copy information about the Company and the Funds, including the SAI, by visiting the SEC’s Public Reference Room in Washington, DC or the EDGAR Database on the SEC’s Internet site at www.sec.gov. You may also obtain copies of Fund documents by paying a duplicating fee and sending an electronic request to the following e-mail address: publicinfo@sec.gov, or by sending your written request and a duplicating fee to the SEC’s Public Reference Section, Washington, DC 20549-0102. You may obtain information on the operation of the public reference room by calling the SEC at (202) 551-8090.

INVESTMENT COMPANY ACT FILE NO. 811–05518

- 32 -

Subject to Completion

Preliminary Prospectus

Investor Class

Robeco Investment Funds

of The RBB Fund, Inc.

THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. WE MAY NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED WITH THE SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER TO SELL THESE SECURITIES AND IS NOT SOLICITING AN OFFER TO BUY THESE SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.

Prospectus

SAM Sustainable Global Active Fund

SAM Sustainable Themes Fund

The securities described in this prospectus have been registered with the Securities and Exchange Commission (“SEC”). The SEC, however, has not judged these securities for their investment merit and has not determined the accuracy or adequacy of this prospectus. Anyone who tells you otherwise is committing a criminal offense.

TABLE OF CONTENTS

A look at the investment objectives, strategies, risks, expenses and financial history of each of the Robeco Investment Funds.

Details about the Robeco Investment Funds’ service providers.

Policies and instructions for opening, maintaining and closing an account in any of the Robeco Investment Funds.

- 2 -

INTRODUCTION

This Prospectus is intended to provide you with the information you need to make an informed decision about whether to invest in the Investor Class of the SAM Sustainable Global Active Fund or SAM Sustainable Themes Fund (the “Funds”), two of the Robeco Investment Funds of The RBB Fund, Inc. (the “Company”).

Sustainable Asset Management USA, Inc. (“SAM” or the “Adviser”) provides investment advisory services to the Funds.

This Prospectus has been organized so that each Fund has its own short section with important facts about the investment objectives, strategies, risks and expenses of the particular Fund. Once you read the sections about the Funds, read the “Purchase of Fund Shares” and “Redemption of Fund Shares” sections. These two sections apply to both of the Funds offered by this Prospectus.

- 3 -

SAM SUSTAINABLE GLOBAL ACTIVE FUND

IMPORTANT DEFINITIONS:

Equity Security: A security, such as a stock, representing ownership of a company. Bonds, in comparison, are referred to as fixed-income or debt securities because they represent indebtedness to the bondholder, not ownership.

Market Capitalization: Market capitalization refers to the market value of a company and is calculated by multiplying the number of shares outstanding by the current price per share.

Investment Objective

The Fund seeks long-term growth of capital primarily through investment in equity and equity-related securities.

Principal Investment Strategies

The Fund pursues it objective by investing, under normal circumstances, at least 80% of its net assets (including any borrowings for investment purposes) in a carefully selected non-diversified portfolio of equity and equity-related securities issued by U.S. and non-U.S. companies that combine their market and financial strategy with a high level of environmental awareness and a clearly defined social policy (“Sustainable Issuers”). The Fund will notify shareholders in writing at least 60 days prior to any change in this 80% policy.

Sustainable Issuers include companies in SAM’s universe of sustainable investments. SAM determines its universe of sustainable investments by analyzing economic, environmental and social criteria. Economic criteria include, without limitation, the issuer’s codes of conduct, compliance policies, instances of corruption or bribery, corporate governance policies, risk and crisis management policies and certain industry specific criteria. Environmental criteria include, without limitation, the issuer’s eco-efficiency, environmental reporting, and certain industry specific criteria. Finally, social criteria include, without limitation, the issuer’s corporate citizenship, philanthropy, labor practices, human capital development practices, social reporting, ability to attract and retain talent, and certain industry specific criteria. SAM believes that these characteristics of Sustainable Issuers make them better equipped to identify and respond to the opportunities and risks presented by global trends. The Fund defines non-U.S. companies as companies (i) that are organized under the laws of a foreign country; (ii) whose principal trading market is in a foreign country; or (iii) that have a majority of their assets, or that derive a significant portion of their revenue or profits from businesses, investments or sales, outside of the United States. Under normal market conditions, the Fund invests significantly (generally at least 40%—unless market conditions are not deemed favorable by SAM, in which case the Fund would invest at least 30%) in non-U.S. companies. The Fund generally will be invested in issuers located in countries with developed securities markets, but may also invest in issuers located in emerging markets. Under normal market conditions, the Fund expects that its investment in emerging markets will not exceed 30%. The Fund will allocate its assets among various regions and countries, including the United States (but in no less than three different countries).

In selecting portfolio securities for the Fund, SAM first defines the eligible universe through its sustainability research. SAM starts with macro research, continues by screening companies for sustainability and eliminates companies that are too small or illiquid. Second, valuations of companies are conducted using SAM’s unique discounted cash flow model, which is based on financial criteria as well as sustainability aspects pertaining to the environment, social criteria and profitability. Sustainability means striving to achieve economic success, while at the same time considering ecological and social objectives. In assessing sustainability, areas such as corporate strategy, corporate governance, transparency as well as product and service range of a company will be taken into consideration. Finally, SAM applies its bottom-up portfolio construction process, which utilizes the valuations of the companies, and is based on the discrepancy between security price and sustainable fair value and on the portfolio risk characteristics of the company’s securities.

The Fund may invest in companies of any market capitalization and currently expects that a significant amount of the Fund’s assets will be invested in micro-, small- and mid-capitalization companies. Micro- and small-capitalization companies generally will have market capitalizations under $2 billion. Mid-capitalization companies generally will have market capitalizations between $2 billion and $10 billion. Large capitalization companies generally will have capitalizations

- 4 -

of over $10 billion. The Fund may also invest in securities of other investment companies, including exchange-traded funds (“ETFs”) The Fund may invest up to 20% of its assets in equity and equity-related securities issued by non-Sustainable Issuers. The Fund may (but is not required to) invest in derivatives, including foreign currency exchange contracts and participatory notes, in lieu of investing directly in a security, currency or instrument, or for hedging purposes.

While SAM intends to fully invest the Fund’s assets at all times in accordance with the above described policies, the Fund reserves the right to hold up to 100% of its assets, as a temporary defensive measure in response to adverse market, economic, political or other conditions, in cash and eligible U.S. dollar-denominated money market instruments, such as commercial paper, government obligations and bank obligations issued by U.S. and foreign issuers. When the Fund’s assets are invested in cash or money market instruments, the Fund may not achieve its investment objective. SAM will determine when adverse market, economic, political or other conditions warrant temporary defensive measures.

Principal Risks

- 5 -

Risk/Return Information

The bar chart and performance table have been omitted because the Fund has not been in operation for a full calendar year. The Fund intends to evaluate its performance as compared to that of a broad-based index, the MSCI World Index. The MSCI World Index is a free float-adjusted market capitalization index that is designed to measure global developed market equity performance.

- 6 -

Expenses and Fees

As a shareholder, you pay certain fees and expenses. The table below describes the fees and expenses that you may pay if you buy and hold Investor Class shares of the Fund.

*Shareholders requesting redemptions by wire are charged a transaction fee of $7.50. A $15.00 custodial maintenance fee is charged per IRA account per year.

(1) To prevent the Fund from being adversely affected by the transaction costs associated with short-term shareholder transactions, the Fund will redeem shares at a price equal to the net asset value of the shares, less an additional transaction fee equal to 1.00% of the net asset value of all such shares redeemed that have been held for less than 60 days (other than shares held by defined contribution plans). Similarly, the Fund charges a transaction fee of 1.00% for any exchange of Fund shares held for less than 60 days (other than shares held by defined contribution plans and shares purchased through the reinvestment of dividends or capital gains distributions.) Such fees are not sales charges or contingent deferred sales charges, but are retained by the Fund for the benefit of remaining shareholders.

(2) Other expenses for the Fund are based on estimated amounts for the current fiscal year. Other expenses include audit, administration, custody, legal, registration, transfer agency and miscellaneous other charges for the Investor Class.

(3) SAM has contractually agreed to waive all or a portion of its advisory fee and/or reimburse expenses in an aggregate amount equal to the amount by which the Fund’s Total annual Fund operating expenses (other than brokerage commissions, extraordinary items, interest or taxes) exceeds 1.45% of the first $50 million of Fund’s average daily net assets, 1.35% if the Fund’s average daily net assets are between $50 million and $100 million, and 1.25% if the Fund’s average daily net assets exceed $100 million through December 31, 2011. SAM may not recoup any of its waived investment advisory fees.

Example

The example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% return each year, that the operating expenses of the Fund remain the same, and that you reinvested all dividends and distributions. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

- 7 -

SAM SUSTAINABLE THEMES FUND

IMPORTANT DEFINITIONS:

Equity Security: A security, such as a stock, representing ownership of a company. Bonds, in comparison, are referred to as fixed-income or debt securities because they represent indebtedness to the bondholder, not ownership.

Market Capitalization: Market capitalization refers to the market value of a company and is calculated by multiplying the number of shares outstanding by the current price per share.

Investment Objective

The Fund seeks long-term growth of capital primarily through investment in equity and equity-related securities.

Principal Investment Strategies

The Fund pursues it objective by investing, under normal circumstances, at least 80% of its net assets (including any borrowings for investment purposes) in a carefully selected non-diversified portfolio of equity and equity-related securities issued by U.S. and non-U.S. companies from sectors that benefit from current environmental, social and economic trends. SAM believes that environmental, social and economic trends such as the limited supply of fossil fuels, demand for unrestricted mobility of people, goods and information, competition for limited raw materials, escalating demand for water and current global demographic changes, present unique growth opportunities for companies in a wide range of industries. The Fund will notify shareholders in writing at least 60 days prior to any change in this 80% policy.

Based on multi-level theme and trend analyses, the Fund will primarily invest in four sustainability sectors, or investment themes, including: energy, water, healthy living and resource efficiency. Issuers in the energy investment theme include, without limitation, oil companies, oil and gas exploration companies, natural gas pipeline companies, refinery companies, energy conservation companies, coal companies, alternative energy companies, and innovative energy technology companies. Issuers in the water investment theme include, without limitation, companies involved in water distribution and water management, water treatment and water purification, water monitoring and chemical analysis, water recycling, sanitary installations and metering, irrigation, and bottled water. Issuers in the healthy living investment theme include, without limitation, companies that grow, process or sell natural and organic foods and personal care products, and companies that manufacture or sell fitness equipment . Issuers in the resource efficiency investment theme include, without limitation companies who manufacture or sell products and services that maximize the efficient use of resources. The Fund defines non-U.S. companies as companies (i) that are organized under the laws of a foreign country; (ii) whose principal trading market is in a foreign country; or (iii) that have a majority of their assets, or that derive a significant portion of their revenue or profits from businesses, investments or sales, outside of the United States. The Fund generally will be invested in issuers located in countries with developed securities markets, but may also invest in issuers located in emerging markets. Under normal market conditions, the Fund expects that its investment in emerging markets will not exceed 30%.

In selecting portfolio securities for the Fund, SAM uses a bottom-up investment process that incorporates a combination of quantitative and fundamental models. The initial step in the process focuses on assessing the impact of long-term macro trends on theme-related companies across all geographic regions and investment clusters. Securities are then selected based on price/value discrepancies, with “expensive” stocks being underweight and attractive stocks being overweight. Additional factors considered include general market conditions, market capitalization exposure, market liquidity, industry sector and geographic allocations, and risk factors, such as size and momentum, as well as total portfolio risk.

SAM integrates “sustainability” into its investment process. The investable universe resulting from the initial stage in the investment process includes companies with the highest expected returns taking into account the impact of sustainability factors. Sustainability as used in this Prospectus means seeking economic success while considering ecological and social objectives. Factors such as corporate strategy, innovation, corporate governance and considerations of the interests of shareholders, employees and other stakeholders are assessed and integrated into company valuations. In determining sustainability, SAM assesses the extent to which companies effectively manage ecological and social

- 8 -

objectives in the course of doing business. Effective management of these objectives should result in lower weighted average cost of capital and a higher return on invested capital.

The Fund may invest in companies of any market capitalization and currently expects that a significant amount of the Fund’s assets will be invested in micro-, small- and mid-capitalization companies. Micro- and small-capitalization companies generally will have market capitalizations under $2 billion. Mid-capitalization companies generally will have market capitalizations between $2 billion and $10 billion. Large capitalization companies generally will have capitalizations of over $10 billion. The Fund may also invest in securities of other investment companies, including exchange-traded funds (“ETFs”). The Fund may invest up to 20% of its assets in equity and equity-related securities issued by companies that do not meet the sustainability criteria described above. The Fund may (but is not required to) invest in derivatives, including foreign currency exchange contracts and participatory notes, in lieu of investing directly in a security, currency or instrument, or for hedging purposes.

While SAM intends to fully invest the Fund’s assets at all times in accordance with the above described policies, the Fund reserves the right to hold up to 100% of its assets, as a temporary defensive measure in response to adverse market, economic, political or other conditions, in cash and eligible U.S. dollar-denominated money market instruments, such as commercial paper, government obligations and bank obligations issued by U.S. and foreign issuers. When the Fund’s assets are invested in cash or money market instruments, the Fund may not achieve its investment objective. SAM will determine when adverse market, economic, political or other conditions warrant temporary defensive measures.

Principal Risks

- 9 -

- 10 -

- 11 -

Risk/Return Information

The bar chart and performance table have been omitted because the Fund has not been in operation for a full calendar year. The Fund intends to evaluate its performance as compared to that of a broad-based index, the MSCI World Index. The MSCI World Index is a free float-adjusted market capitalization index that is designed to measure global developed market equity performance.

- 12 -

Expenses and Fees

As a shareholder, you pay certain fees and expenses. The table below describes the fees and expenses that you may

pay if you buy and hold Investor Class shares of the Fund.

*Shareholders requesting redemptions by wire are charged a transaction fee of $7.50. A $15.00 custodial maintenance fee is charged per IRA account per year.

(1) To prevent the Fund from being adversely affected by the transaction costs associated with short-term shareholder transactions, the Fund will redeem shares at a price equal to the net asset value of the shares, less an additional transaction fee equal to 1.00% of the net asset value of all such shares redeemed that have been held for less than 60 days (other than shares held by defined contribution plans). Similarly, the Fund charges a transaction fee of 1.00% for any exchange of Fund shares held for less than 60 days (other than shares held by defined contribution plans and shares purchased through the reinvestment of dividends or capital gains distributions.) Such fees are not sales charges or contingent deferred sales charges, but are retained by the Fund for the benefit of remaining shareholders.

(2) Other expenses for the Fund are based on estimated amounts for the current fiscal year. Other expenses include audit, administration, custody, legal, registration, transfer agency and miscellaneous other charges for the Investor Class.

(3) SAM has contractually agreed to waive all or a portion of its advisory fee and/or reimburse expenses in an aggregate amount equal to the amount by which the Fund’s Total annual Fund operating expenses (other than brokerage commissions, extraordinary items, interest or taxes) exceeds 1.75% of the first $50 million of Fund’s average daily net assets, 1.65% if the Fund’s average daily net assets are between $50 million and $100 million, and 1.50% if the Fund’s average daily net assets exceed $100 million through December 31, 2011. SAM may not recoup any of its waived investment advisory fees.

Example

The example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% return each year, that the operating expenses of the Fund remain the same, and that you reinvested all dividends and distributions. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

- 13 -

ADDITIONAL INFORMATION ABOUT THE FUNDS’ INVESTMENTS AND RISKS

This section provides some additional information about the Funds’ investments and certain portfolio management techniques that the Funds may use. More information about the Funds’ investments and portfolio management techniques, some of which entail risks, is included in the SAI.

Additional Information About the Funds’ Principal Investments and Risks

Equity and Equity-Related Securities. Each Fund may invest in all types of equity securities. Equity securities include exchange-traded and over-the-counter common and preferred stocks, warrants, rights, convertible securities, depositary receipts and shares, trust certificates, limited partnership interests, shares of other investment companies and REITs, and equity participations. The number of issuers in the Funds’ portfolios will vary over time.

Foreign Securities. Each Fund may invest in securities of foreign issuers that are traded or denominated in U.S. dollars (including equity securities of foreign issuers trading in U.S. markets) through American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”), European Depositary Receipts (“EDRs”) or International Depositary Receipts (“IDRs”). In addition, the Fund may also invest in securities denominated in foreign currencies. Investments in securities of foreign entities involve special risks. These include possible political and economic instability and the possible imposition of exchange controls or other restrictions on investments. Emerging market investments offer the potential for significant gains but also involve greater risks than investing in more developed countries. Political or economic instability, lack of market liquidity and governmental actions such as currency controls or seizure of private business or property may be more likely in emerging markets.

Each Fund will normally invest a significant portion of its assets in the equity securities and equity-related instruments issued by non-U.S. companies and, under normal market conditions, up to 30% of each Fund’s assets may be invested in issuers located in countries with emerging securities markets. A Fund will invest in securities denominated in the currencies of a variety of emerging and frontier market countries. Each Fund may also invest in securities, instruments and derivatives denominated in multinational currencies such as the Euro. A Fund will value its securities and other assets in U.S. dollars. Unless hedged, currency fluctuations may have a material impact on the performance of a portfolio of non-U.S. dollar-denominated securities and such a portfolio may experience a decline or increase in value, in U.S. dollar terms, due to fluctuations in currency exchange rates. The Adviser currently intends to hedge foreign currency exposure in a Fund’s portfolio. Further, the Funds may also from time to time enter into speculative currency positions independent of other positions in the Funds’ portfolios.

Each Fund may also invest in participatory notes. Participatory notes (commonly known as “P-notes”) are derivative instruments used by investors to take positions in certain foreign securities. P-notes are generally issued by the associates of foreign-based foreign brokerages and domestic institutional brokerages. P-notes represent interests in securities listed on certain foreign exchanges, and thus present similar risks to investing directly in such securities. P-notes also expose investors to counterparty risk, which is the risk that the entity issuing the note may not be able to

honor its financial commitments.

Exchange-Traded Funds (ETFs). Each Fund may invest up to 5% of its assets in ETFs. ETFs are registered investment companies whose shares are listed and traded on U.S. stock exchanges or otherwise traded in the over-the-counter market. In general, ETFs seek to track a specified securities index or a basket of securities that an “index provider,” such as Standard & Poor’s, selects as representative of a market, market segment or industry sector. An ETF portfolio generally holds the same stocks or bonds as the index it tracks or it may hold a representative sample of such securities. Thus, an ETF is designed so that its performance will correspond closely with that of the index it tracks. As a shareholder in an ETF, the Funds will bear their pro rata portion of an ETF’s expenses, including advisory fees, in addition to its own expenses.

Other Investment Companies. Each of the Funds may invest up to 10% of its total assets in the securities of other investment companies not affiliated with the Adviser, but may not invest more than 5% of its total assets in the

- 14 -

securities of any one investment company or acquire more than 3% of the voting securities of any other investment company. Among other things, the Funds may invest in money market mutual funds for cash management purposes by “sweeping” excess cash balances into such funds until the cash is invested or otherwise utilized. Each Fund will indirectly bear its proportionate share of any management fees and other expenses paid by investment companies in which it invests in addition to the advisory and administration fees paid by the Fund.

Portfolio Turnover. Each Fund may engage in active and frequent trading, resulting in high portfolio turnover.

This may lead to the realization and distribution to shareholders of higher capital gains, increasing their tax liability.

Frequent trading may also increase transaction costs, which could detract from the Funds’ performance.

Securities Lending. The Funds may seek to increase their income by lending portfolio securities to institutions, such as certain broker-dealers. Portfolio securities loans are secured continuously by collateral maintained on a current basis at an amount at least equal to the market value of the securities loaned. The value of the securities loaned by a Fund will not exceed 33 1/3% of the value of the Fund’s total assets. A Fund may experience a loss or delay in the recovery of its securities if the borrowing institution breaches its agreement with the Fund.

Temporary Investments. Each of the Funds may depart from its principal investment strategy in response to adverse market, economic, political or other conditions by taking temporary defensive positions (up to 100% of its assets) in all types of money market and short-term debt securities. If a Fund were to take a temporary defensive position, it may be unable for a time to achieve its investment objective.

Disclosure of Portfolio Holdings

Each Fund’s complete portfolio holdings are publicly available on Robeco Investment Management Inc.’s website at www.robecoinvest.com as of each calendar quarter (March 31, June 30, September 30 and December 31) 60 days following the quarter end. Any postings will remain available on the website at least until the Funds file with the SEC their semi-annual or annual shareholder report or quarterly portfolio holdings report that includes such period. A further description of the Company’s policies and procedures with respect to the disclosure of each Fund’s portfolio securities is available in the Funds’ SAI.

- 15 -

MANAGEMENT OF THE FUND

Investment Adviser

The Adviser provides investment management and investment advisory services to investment companies and other institutional and proprietary accounts.

Subject to the general supervision of the Company’s Board of Directors, the Adviser manages the Funds’ portfolio and is responsible for the selection and management of all portfolio investments of the Funds in accordance with the Fund’s investment objectives and policies.

Sustainable Asset Management USA, Inc.

SAM, located at 909 Third Avenue, 32nd Floor, New York, NY 10022 and Josefstrasse 218, CH-8005 Zurich, Switzerland, provides investment advisory services to the Funds. SAM is an affiliate of Robeco Investment Management, Inc., and a subsidiary of Robeco Group. SAM provides investment management and investment advisory services to other institutional and proprietary accounts.

Pursuant to an investment advisory agreement with the Company, SAM is entitled to an advisory fee at the annual rate of 0.80% of the Sustainable Global Active Fund and 1.00% of the Sustainable Themes Fund’s average daily net assets, computed daily and payable monthly. A discussion regarding the Board of Directors’ basis for approving the investment advisory agreement with respect to the SAM Funds will be available in the Funds’ semi-annual report for the period ending February 28, 2009.

SAM has contractually agreed to waive a portion of its advisory fees and/or reimburse expenses to the extent necessary to limit total annual operating expenses of the SAM Global Active Fund to 1.20% of the first $50 million of Fund’s average daily net assets, 1.10% if the Fund’s average daily net assets is between $50 million and $100 million, and 1.00% if the Fund’s average daily net assets exceeds $100 million and has agreed to limit total annual operating expenses of the SAM Themes Fund to 1.50% of the first $50 million of Fund’s average daily net assets, 1.40% if the Fund’s average daily net assets is between $50 million and $100 million, and 1.25% if the Fund’s average daily net assets exceeds $100 million through December 31, 2011. The Adviser may discontinue these arrangements at any time after December 31, 2011.

Portfolio Managers

The investment results for different strategies of the Adviser are not solely dependent on any one individual. There is a common philosophy and approach that is the backdrop for all of the investment strategies of the Adviser. This philosophy is then executed through a very disciplined investment process managed by the designated portfolio manager for the strategy. This manager will be supported, not only by a secondary manager, but by the Adviser’s general research staff and, very often, by dedicated analysts to the particular strategy.

The SAI provides additional information about the portfolio managers’ compensation, other accounts managed by the portfolio managers and the portfolio managers’ ownership of securities in the Fund.

SAM Sustainable Global Active Fund

Diego d’Argenio, CFA, serves as senior portfolio manger for the SAM Sustainable Global Active Fund. He has been employed by SAM and SAM AG since 2005. Prior to that, he worked for three years at ARCA Asset Management in Milan as equity portfolio manager and member of its investment committee in charge of tactical asset allocation development. He started his career in Kuwait Petroleum as Financial analyst. Diego d’Argenio successfully pursued studies in Economics with major in Finance at Rome University. In addition to that he holds a Master in finance and Investment Banking and he is since 2005 a Chartered financial Analyst (CFA).

SAM Sustainable Themes Fund

- 16 -

Rainer Baumann, CFA serves as senior portfolio manager for the SAM Sustainable Themes Fund. He has been dually employed by SAM and SAM AG, since 2002. Prior to that, Mr. Baumann was a portfolio manager for UBS AG where he was responsible for the management of private mandates and was a member of the investment committee in Europe. He started his career as an assistant in the bank audit department at PricewaterhouseCoopers LLP and has a total of 9 years experience. Mr. Baumann is a chartered financial analyst and holds a master’s degree in business administration from the University of Zurich.

Marketing Arrangements

The Adviser, or its affiliates, may pay additional compensation, out of profits derived from the Adviser’s management fee and not as an additional charge to the Funds, to certain financial institutions (which may include banks, securities dealers and other industry professionals) for the sale and/or distribution of Funds shares or the retention and/or servicing of Funds investors and Fund shares (“revenue sharing”). These payments are in addition to any distribution or servicing fees payable under a 12b-1 distribution and service plan of the Funds, any record keeping or sub-transfer agency fees payable by the Funds, or other fees described in the fee table or elsewhere in the Prospectus or SAI. Examples of “revenue sharing” payments include, but are not limited to, payment to financial institutions for “shelf space” or access to a third party platform or fund offering list or other marketing programs, including, but not limited to, inclusion of the Funds on preferred or recommended sales lists, mutual fund “supermarket” platforms and other formal sales programs; granting the Adviser access to the financial institution’s sales force; granting the Adviser access to the financial institution’s conferences and meetings; assistance in training and educating the financial institution’s personnel; and obtaining other forms of marketing support. The level of revenue sharing payments made to financial institutions may be a fixed fee or based upon one or more of the following factors; gross sales, current assets and/or number of accounts of the Funds attributable to the financial institution, or other factors as agreed to by the Adviser and the financial institution or any combination thereof. The amount of these revenue sharing payments is determined at the discretion of the Adviser from time to time, may be substantial, and may be different for different financial institutions depending upon the services provided by the financial institution. Such payments may provide an incentive for the financial institution to make shares of the Funds available to its customers and may allow the Funds greater access to the financial institution’s customers.

Prior Performance of Similarly Advised Accounts

The Funds’ respective portfolio managers are employees of both SAM and SAM’s affiliate, SAM AG. The tables below present past performance information for the SAM Sustainable Global Active Composite (the “Global Active Composite”) and the SAM Sustainable Themes Composite (the “Themes Composite”). The Global Active Composite consists of all separate accounts and/or commingled accounts managed by the Sustainable Global Active Fund’s portfolio managers on behalf of SAM AG in a substantially similar manner as the Sustainable Global Active Fund. The Themes Composite consists of all separate accounts and/or commingled accounts managed by the Sustainable Themes Fund’s portfolio managers on behalf of SAM AG in a substantially similar manner as the Sustainable Themes Fund. All of the accounts comprising the Global Active Composite have substantially similar investment objectives, policies and strategies as the Sustainable Global Active Fund. All of the accounts comprising the Themes Composite have substantially similar investment objectives, policies and strategies as the Sustainable Themes Fund.

The information is provided to illustrate the past performance of the Funds’ respective portfolio managers in managing substantially similar accounts and does not represent the performance of the Sustainable Global Active Fund or the Sustainable Themes Fund. Investors should not consider this performance information as a substitute for the performance of the Sustainable Global Active Fund or the Sustainable Themes Fund, nor should investors consider this information as an indication of the future performance of the Sustainable Global Active Fund or the Sustainable Themes Fund or of SAM or of SAM AG. The overall expenses of the accounts in the Global Active Composite and the Themes Composite are generally lower than those that would be experienced by the holders of Investor Class shares of the Sustainable Global Active Fund and the Sustainable Themes Fund, respectively, and, therefore, the performance of the Investor Class shares of the Sustainable Global Active Fund and Sustainable Themes Fund would generally be lower. However, the Sustainable Global Active Fund’s and the Sustainable Themes Fund’s results in the future also may be different because the accounts in the Global Active Composite and Themes Composite, respectively, are not subject to certain investment limitations, diversification requirements and other restrictions imposed on mutual funds under applicable U.S. securities and tax laws that, if applicable, could have adversely affected the performance of the accounts in the Global Active Composite and the Themes Composite. In addition, the securities held by the Sustainable Global Active Fund and the Sustainable Themes Fund will not be identical to the securities held by the accounts in the Global

- 17 -

Active Composite and Themes Composite, respectively. The performance of each Composite is also compared to the performance of a broad-based securities benchmark index appropriate to both the Sustainable Global Active Fund and the Sustainable Themes Fund. The index is unmanaged and is not subject to fees and expenses typically associated with managed funds, including the Sustainable Global Active Fund and the Sustainable Themes Fund. Investors cannot invest directly in the index. The performance information is accompanied by additional disclosures, which are an integral part of the information.

- 18 -

SAM SUSTAINABLE GLOBAL ACTIVE COMPOSITE

(Returns as of November 30, 2008)

SAM SUSTAINABLE THEMES COMPOSITE

(Returns as of November 30, 2008)

- 19 -

- 20 -

Other Service Providers

The following chart shows the Funds’ service providers and includes their addresses and principal activities.

- 21 -

SHAREHOLDER INFORMATION

Pricing of Fund Shares

Investor Class shares of the Funds (“Shares”) are priced at their net asset value (“NAV”). The NAV per share of each Fund is calculated as follows:

The Funds’ NAV is calculated once daily at the close of regular trading hours on the New York Stock Exchange (“NYSE”) (generally 4:00 p.m. Eastern time) on each day the NYSE is open. The NYSE is generally open Monday through Friday, except national holidays. Each Fund will effect purchases of Fund shares at the NAV next determined after receipt of your order or request in proper form. Each Fund will effect redemptions of Fund shares at the NAV next calculated after receipt of your order in proper form.

The Funds’ equity securities listed on any national or foreign exchange market system will be valued at the last sale price, except for the National Association of Securities Dealers Automatic Quotation System (“NASDAQ”). Equity securities listed on NASDAQ will be valued at the official closing price. Equity securities traded in the over-the-counter market are valued at their closing prices. If there were no transactions on that day, securities traded principally on an exchange or on NASDAQ will be valued at the mean of the last bid and ask prices prior to the market close. Fixed income securities having a remaining maturity of 60 days or less are valued at amortized cost, which approximates market value. Fixed income securities having a remaining maturity of greater than 60 days are valued using an independent pricing service. When prices are not available from such services or are deemed to be unreliable, securities may be valued by dealers who make markets in such securities. Foreign securities, currencies and other securities denominated in foreign currencies are translated into U.S. dollars at the exchange rate of such currencies against the U.S. dollar provided by a pricing service. All assets denominated in foreign currencies will be converted into U.S. dollars at the exchange rates in effect at the time of valuation. If a Fund holds foreign equity securities, the calculation of the Funds’ NAV will not occur at the same time as the determination of the value of the foreign equities securities in the Funds’ portfolio, since these securities are traded on foreign exchanges.

If market quotations are unavailable or deemed unreliable, securities will be valued in accordance with procedures adopted by the Company’s Board of Directors. In addition, the prices of foreign securities may be affected by events that occur after the close of a foreign market but before the Fund prices its shares. In such instances, a foreign security may be fair valued in accordance with procedures adopted by the Company’s Board of Directors. Relying on prices supplied by pricing services or dealers or using fair valuation involves the risk that the values used by a Fund to price its investments may be higher or lower than the values used by other investment companies and investors to price the same investments.

Investments in other open-end investment companies are valued based on the NAV of those investment companies (which may use fair value pricing as discussed in their prospectuses).

Market Timing

In accordance with the policy adopted by the Company’s Board of Directors, the Company discourages market timing and other excessive trading practices. Purchases should be made with a view to longer-term investment only. Excessive short-term (market timing) trading practices may disrupt portfolio management strategies, increase brokerage and administrative costs, harm Fund performance and result in dilution in the value of Fund shares held by long-term shareholders. The Company and the Adviser reserve the right to reject or restrict purchase requests from any investor. The Company and the Adviser will not be liable for any loss resulting from rejected purchase orders. To minimize harm to the Company and its shareholders (or the Adviser), the Company (or the Adviser) will exercise their right if, in the Company’s (or the Adviser’s) judgment, an investor has a history of excessive trading or if an investor’s trading, in the judgment of the Company or the Adviser, has been or may be disruptive to the Fund. No waivers of the provisions of the

- 22 -

policy established to detect and deter market timing and other excessive trading activity are permitted that would harm a Fund and its shareholders or would subordinate the interests of a Fund and its shareholders to those of the Adviser or any affiliated person or associated person of the Adviser.

To deter excessive shareholder trading, the Funds generally charge a redemption fee of 1% on shares redeemed within 60 days of purchase. In addition, the Funds generally limits the number of exchanges to six (6) times per year (one exchange per calendar month). For further information on redemptions and exchanges, please see the sections titled “Shareholder Information — Redemption of Fund Shares” and “Shareholder Information — Exchange Privilege.”

Pursuant to the policy adopted by the Board of Directors, the Adviser has developed criteria that they use to identify trading activity that may be excessive. The Adviser reviews on a regular, periodic basis available information related to the trading activity in the Funds in order to assess the likelihood that a Fund may be the target of excessive trading. As part of its excessive trading surveillance process, the Adviser, on a periodic basis, examines transactions that exceed certain monetary thresholds or numerical limits within a period of time (see “Exchange Privilege” below). If, in its judgment, an Adviser detects excessive, short-term trading, the Adviser may reject or restrict a purchase request and may further seek to close an investor’s account with a Fund. The Adviser may modify its surveillance procedures and criteria from time to time without prior notice regarding the detection of excessive trading or to address specific circumstances. The Adviser will apply the criteria in a manner that, in the Adviser’s judgment, will be uniform. There is no assurance that an Adviser will be able to identify market timers, particularly if they are investing through intermediaries.

If necessary, the Company may prohibit additional purchases of Fund shares by a financial intermediary or by certain customers of the financial intermediary. Financial intermediaries may also monitor their customers’ trading activities in the Company. The criteria used by intermediaries to monitor for excessive trading may differ from the criteria used by the Company. If a financial intermediary fails to enforce the Company’s excessive trading policies, the Company may take certain actions, including terminating the relationship.

Purchase of Fund Shares

Shares representing interests in the Funds are offered continuously for sale by PFPC Distributors, Inc. (the “Distributor”). The Board of Directors has approved a Distribution Agreement and adopted a separate Plan of Distribution for the shares (the “Plan”) pursuant to Rule 12b-1 under the Investment Company Act of 1940. Under the Plan, the Distributor is entitled to receive from each Fund a distribution fee with respect to the Shares, which is accrued daily and paid monthly, of up to 0.25% on an annualized basis of the average daily net assets of the Shares. The actual amount of such compensation under the Plan is agreed upon by the Company’s Board of Directors and by the Distributor. Because these fees are paid out of each Fund’s assets on an ongoing basis, over time these fees will increase the cost of your investment and may cost you more than paying other types of sales charges.

Amounts paid to the Distributor under the Plan may be used by the Distributor to cover expenses that are related to (i) the sale of the Shares, (ii) ongoing servicing and/or maintenance of the accounts of shareholders, and (iii) sub-transfer agency services, subaccounting services or administrative services related to the sale of the Shares, all as set forth in the Funds’ 12b-1 Plan. Ongoing servicing and/or maintenance of the accounts of shareholders may include updating and mailing prospectuses and shareholder reports, responding to inquiries regarding shareholder accounts and acting as agent or intermediary between shareholders and the Funds or their service providers. The Distributor may delegate some or all of these functions to Service Organizations. See “Purchases Through Intermediaries” below.

The Plan obligates the Funds, during the period it is in effect, to accrue and pay to the Distributor on behalf of the Shares the fee agreed to under the Distribution Agreement. Payments under the Plan are not tied exclusively to expenses actually incurred by the Distributor, and the payments may exceed distribution expenses actually incurred.

Purchases Through Intermediaries. Shares of the Funds may also be available through certain brokerage firms, financial institutions and other industry professionals (collectively, “Service Organizations”). Certain features of the Shares, such as the initial and subsequent investment minimums and certain trading restrictions, may be modified or waived by Service Organizations. Service Organizations may impose transaction or administrative charges or other direct fees, which charges and fees would not be imposed if Shares are purchased directly from the Company. Therefore, you should contact the Service Organization acting on your behalf concerning the fees (if any) charged in connection with a purchase or redemption of Shares and should read this Prospectus in light of the terms governing your

- 23 -

accounts with the Service Organization. Service Organizations will be responsible for promptly transmitting client or customer purchase and redemption orders to the Company in accordance with their agreements with the Company and with clients or customers. Service Organizations or, if applicable, their designees that have entered into agreements with the Company or its agent may enter confirmed purchase orders on behalf of clients and customers, with payment to follow no later than the Company’s pricing on the following Business Day. If payment is not received by such time, the Service Organization could be held liable for resulting fees or losses. The Company will be deemed to have received a purchase or redemption order when a Service Organization, or, if applicable, its authorized designee, accepts a purchase or redemption order in good order if the order is actually received by the Company in good order not later than the next business morning. If a purchase order is not received by a Fund in good order, PNC Global Investment Servicing. (the “Transfer Agent”) will contact the financial intermediary to determine the status of the purchase order. Orders received by the Company in good order will be priced at each Fund’s NAV next computed after they are deemed to have been received by the Service Organization or its authorized designee.

The Company relies upon the integrity of Service Organizations to ensure that orders are timely and properly submitted. The Funds cannot assure you that a Service Organization properly submitted to it all purchase and redemption orders received from the Service Organization’s customers before the time for determination of a Fund’s NAV in order to obtain that day’s price.

For administration, subaccounting, transfer agency and/or other services, the Adviser, the Distributor or their affiliates may pay Service Organizations and certain recordkeeping organizations a fee (the “Service Fee”) of the average annual NAV of accounts with the Company maintained by such Service Organizations or recordkeepers. The Service Fee payable to any one Service Organization is determined based upon a number of factors, including the nature and quality of services provided, the operations processing requirements of the relationship and the standardized fee schedule of the Service Organization or recordkeeper.

General. You may also purchase Shares of the Funds at the NAV per share next calculated after your order is received by the Transfer Agent in proper form as described below. After an initial purchase is made, the Transfer Agent will set up an account for you on the Company records. The minimum initial investment in each Fund is $2,500 and the minimum additional investment is $100. The minimum initial and subsequent investment requirements may be reduced or waived from time to time. For purposes of meeting the minimum initial purchase, purchases by clients which are part of endowments, foundations or other related groups may be combined. You can only purchase Shares of a Fund on days the NYSE is open and through the means described below. Shares may be purchased by principals and employees of the Adviser and its subsidiaries and by their spouses and children either directly or through any trust that has the principal, employee, spouse or child as the primary beneficiaries, their individual retirement accounts, or any pension and profit-sharing plan of the Adviser and its subsidiaries without being subject to the minimum investment limitations.

Initial Investment By Mail. An account may be opened by completing and signing the application included with this Prospectus and mailing it to the Transfer Agent at the address noted below, together with a check ($2,500 minimum) payable to the Fund in which you would like to invest. Third party checks will not be accepted.

The name of the Fund should be designated on the application and should appear on the check. Payment for the purchase of Shares received by mail will be credited to a shareholder’s account at the NAV per share of the Fund next determined after receipt of payment in good order.

Initial Investment By Wire. Shares of the Funds may be purchased by wiring federal funds to PNC Bank, N.A. (see instructions below). A completed application must be forwarded to the Transfer Agent at the address noted above under “Initial Investment by Mail” in advance of the wire. For each Fund, notification must be given to the Transfer Agent at (888) 261-4073 prior to 4:00 p.m., Eastern time, on the wire date. (Prior notification must also be received from investors with existing accounts.) Request account information and routing instructions by calling the Transfer Agent at (888) 261-4073. Funds should be wired to:

- 24 -

PNC Bank, N.A.

Philadelphia, Pennsylvania 19103

ABA# 0310-0005-3

Account # 86-1108-2507

F/B/O [name of fund]

Ref. (Account Number)

Shareholder or Account Name

Federal fund wire purchases will be accepted only on days when the NYSE and PNC Bank, N.A. are open for business.

Additional Investments. Additional investments may be made at any time (minimum additional investment $100) by purchasing Shares of a Fund at the NAV per Share of the Fund by mailing a check to the Transfer Agent at the address noted under “Initial Investment by Mail” (payable to SAM Sustainable Global Active Fund or SAM Sustainable Themes Fund, respectively) or by wiring monies to PNC Bank, N.A. as outlined under “Initial Investment by Wire.” For each Fund, notification must be given to the Transfer Agent at (888) 261-4073 prior to 4:00 p.m., Eastern time, on the wire date. Initial and additional purchases made by check cannot be redeemed until payment of the purchase has been collected. This may take up to 15 calendar days from the date of purchase.

Automatic Investment Plan. Additional investments in Shares of the Funds may be made automatically by authorizing the Transfer Agent to withdraw funds from your bank account through an Automatic Investment Plan ($100 minimum). Investors desiring to participate in an Automatic Investment Plan should call the Transfer Agent at (888) 261-4073.

Retirement Plans. Shares may be purchased in conjunction with individual retirement accounts (“IRAs”) and rollover IRAs where PFPC Trust Company acts as custodian. A $15.00 custodial maintenance fee is charged per IRA account per year. For further information as to applications and annual fees, contact the Transfer Agent at (888) 261- 4073. To determine whether the benefits of an IRA are available and/or appropriate, you should consult with a tax advisor.

Other Purchase Information. The Company reserves the right, in its sole discretion, to suspend the offering of Shares or to reject purchase orders when, in the judgment of management, such suspension or rejection is in the best interests of the Funds. Subject to Board of Directors’ discretion, SAM will monitor the Funds’ total assets and may decide to close a Fund at any time to new investments or to new accounts due to concerns that a significant increase in the size of the Fund may adversely affect the implementation of the Fund’s strategy. Subject to Board of Directors’ discretion, SAM may also choose to reopen a closed Fund to new investments at any time, and may subsequently close the Fund again should concerns regarding the Fund’s size recur. If a Fund closes to new investments, generally the closed Fund would be offered only to certain existing shareholders of the Fund and certain other persons, who are generally subject to cumulative, maximum purchase amounts, as follows:

a. Persons who already hold Shares of the closed Fund directly or through accounts maintained by brokers by arrangement with the Company;

b. Existing and future clients of financial advisers and planners whose clients already hold Shares of the closed Fund;

c. Employees of the Adviser and their spouses, parents and children; and

d. Directors of the Company.

Other persons who are shareholders of other Robeco Funds are not permitted to acquire Shares of the closed Fund by exchange. Distributions to all shareholders of the closed Fund will continue to be reinvested unless a shareholder elects otherwise. The Adviser, subject to the Board of Directors’ discretion, reserves the right to implement other purchase limitations at the time of closing, including limitations on current shareholders.

- 25 -

Purchases of the Funds’ Shares will be made in full and fractional shares of the Funds calculated to three decimal places.

The Company’s officers are authorized to waive the minimum initial and subsequent investment requirements.

Good Order. You must include complete and accurate required information on your purchase request. Please see “Purchase of Fund Shares” for instructions. Purchase requests not in good order may be rejected.

Customer Identification Program. Federal law requires the Company to obtain, verify and record identifying information, which may include the name, residential or business street address, date of birth (for an individual), social security or taxpayer identification number or other identifying information for each investor who opens or reopens an account with the Company. Applications without the required information, or without any indication that a social security or taxpayer identification number has been applied for, may not be accepted. After acceptance, to the extent permitted by applicable law or its customer identification program, the Company reserves the right (a) to place limits on transactions in any account until the identity of the investor is verified; or (b) to refuse an investment in a Company portfolio or to involuntarily redeem an investor’s Shares and close an account in the event that an investor’s identity is not verified. The Company and its agents will not be responsible for any loss in an investor’s account resulting from the investor’s delay in providing all required identifying information or from closing an account and redeeming an investor’s Shares when an investor’s identity cannot be verified.

Redemption of Fund Shares

Normally, your investment firm will send your request to redeem Shares to the Funds’ transfer agent. Consult your investment professional for more information. You can redeem some or all of your Fund shares directly through the Fund only if the account is registered in your name. All IRA shareholders must complete an IRA withdrawal form to redeem shares from their IRA account.

You may redeem Shares of each Fund at the next NAV calculated after a redemption request is received by the Transfer Agent in proper form. You can only redeem Shares on days the NYSE is open and through the means described below.

You may redeem Shares of a Fund by mail, or, if you are authorized, by telephone (excluding retirement accounts where PFPC Trust Company acts as custodian). The value of Shares redeemed may be more or less than the purchase price, depending on the market value of the investment securities held by a Fund. There is generally no charge for a redemption. However, with the exception of defined contribution plans, if a shareholder of the Fund redeems Shares held for less than 60 days, a transaction fee of 1% of the NAV of the Shares redeemed at the time of redemption will be charged. For purposes of this redemption feature, Shares purchased first will be considered to be Shares first redeemed.

Redemption By Mail. Your redemption requests should be addressed to SAM Sustainable Global Active Fund or SAM Sustainable Themes Fund, c/o PNC Global Investment Servicing, P.O. Box 9816, Providence, RI 02940; for overnight delivery, requests should be addressed to SAM Sustainable Global Active Fund or SAM Sustainable Themes Fund, c/o PNC Global Investment Servicing, 101 Sabin Street, Pawtucket, RI 02860-1427 and must include:

a. Name of the Fund;

b. Account number;

c. Your share certificates, if any, properly endorsed or with proper powers of attorney;

d. A letter of instruction specifying the number of Shares or dollar amount to be redeemed, signed by all registered owners of the Shares in the exact names in which they are registered;

e. Medallion signature guarantees are required when (i) the redemption proceeds are to be sent to someone other than the registered shareholder(s) or (ii) the redemption request is for $50,000 or more. A signature guarantee may be obtained from a domestic bank or trust company, broker, dealer, clearing agency or savings

- 26 -

association who are participants in a Medallion Program recognized by the Securities Transfer Association. The three recognized Medallion Programs are Securities Transfer Agent Medallion Program (STAMP), Stock Exchanges Medallion Program (SEMP) and New York Stock Exchange, Inc. Medallion Program (MSP). Signature guarantees which are not a part of these programs will not be accepted. Please note that a notary public stamp or seal is not acceptable; and

f. Other supporting legal documents, if required, in the case of estates, trusts, guardianships, custodianships, corporations, pension and profit sharing plans and other organizations.

Redemption By Telephone. In order to request a telephone redemption, you must have returned your account application containing a telephone election. To add a telephone redemption option to an existing account, contact the Transfer Agent by calling (888) 261-4073. Please note that IRA accounts are not eligible for telephone redemption. Once you are authorized to utilize the telephone redemption option, a redemption of Shares may be requested by calling the Transfer Agent at (888) 261-4073 and requesting that the redemption proceeds be mailed to the primary registration address or wired per the authorized instructions. A wire charge of $7.50 is assessed and charged to the shareholder. If the telephone redemption option or the telephone exchange option is authorized, the Transfer Agent may act on telephone instructions from any person representing himself or herself to be a shareholder and believed by the Transfer Agent to be genuine. The Transfer Agent’s records of such instructions are binding and shareholders, not the Company or the Transfer Agent, bear the risk of loss in the event of unauthorized instructions reasonably believed by the Company or the Transfer Agent to be genuine. The Company and the Transfer Agent will employ reasonable procedures to confirm that instructions communicated are genuine and, if it does not, it may be liable for any losses due to unauthorized or fraudulent instructions. The procedures employed by the Company and the Transfer Agent in connection with transactions initiated by telephone include tape recording of telephone instructions and requiring some form of personal identification prior to acting upon instructions received by telephone.

Systematic Withdrawal Plan. If your account has a value of at least $10,000, you may establish a Systematic Withdrawal Plan and receive regular periodic payments. A request to establish a Systematic Withdrawal Plan must be submitted in writing to the Transfer Agent at P.O. Box 9816, Providence, RI 02940. Each withdrawal redemption will be processed on or about the 25th of the month and mailed as soon as possible thereafter. There are no service charges for maintenance; the minimum amount that you may withdraw each period is $100. (This is merely the minimum amount allowed and should not be mistaken for a recommended amount.) The holder of a Systematic Withdrawal Plan will have any income dividends and any capital gains distributions reinvested in full and fractional shares at NAV. To provide funds for payment, Shares will be redeemed in such amounts as are necessary at the redemption price. The systematic withdrawal of Shares may reduce or possibly exhaust the Shares in your account, particularly in the event of a market decline. As with other redemptions, a systematic withdrawal payment is a sale for federal income tax purposes. Payments made pursuant to a Systematic Withdrawal Plan cannot be considered as actual yield or income since part of such payments may be a return of capital.

You will ordinarily not be allowed to make additional investments of less than the aggregate annual withdrawals under the Systematic Withdrawal Plan during the time you have the plan in effect and, while a Systematic Withdrawal Plan is in effect, you may not make periodic investments under the Automatic Investment Plan. You will receive a confirmation of each transaction and the Share and cash balance remaining in your plan. The plan may be terminated on written notice by the shareholder or by the Funds and will terminate automatically if all Shares are liquidated or withdrawn from the account or upon the death or incapacity of the shareholder. You may change the amount and schedule of withdrawal payments or suspend such payments by giving written notice to the Funds’ transfer agent at least ten Business Days prior to the end of the month preceding a scheduled payment.

Transaction Fee on Certain Redemptions

The Funds require the payment of a transaction fee on redemption of Shares held for less than 60 days equal to 1.00% of the NAV of such Shares redeemed at the time of redemption. This additional transaction fee is paid to the Funds, NOT to the Adviser, Distributor or Transfer Agent. It is NOT a sales charge or a contingent deferred sales charge. The fee does not apply to defined contribution plans or to redeemed Shares that were purchased through reinvested dividends or capital gain distributions. The additional transaction fee is intended to limit short-term trading in the Fund or, to the extent that short-term trading persists, to impose the costs of that type of activity on the shareholders who engage

- 27 -

in it. These costs include: (i) brokerage costs; (ii) market impact costs — i.e., the decrease in market prices which may result when a Fund sells certain securities in order to raise cash to meet the redemption request; (iii) the realization of capital gains by the other shareholders in the Fund; and (iv) the effect of the “bid-ask” spread in the over-the-counter market. The transaction fee represents a Fund’s estimate of the brokerage and other transaction costs which may be incurred by the Fund in disposing of stocks in which the Fund may invest. Without the additional transaction fee, a Fund would generally be selling its shares at a price less than the cost to the Fund of acquiring the portfolio securities necessary to maintain its investment characteristics, resulting in reduced investment performance for all shareholders in the Fund. With the additional transaction fee, the transaction costs of selling additional stocks are not borne by all existing shareholders, but the source of funds for these costs is the transaction fee paid by those investors making redemptions of the Fund. Each Fund reserves the right, at their discretion, to waive, modify or terminate the additional transaction fee.

The Funds will use the first-in, first-out method to determine your holding period. Under this method, the date of redemption or exchange will be compared with the earliest purchase date of Shares held in your account. The short-term redemption fee will be assessed on the net asset value of those Shares calculated at the time the redemption is effected.

Involuntary Redemption. The Funds reserve the right to redeem a shareholder’s account in any Fund at any time the value of the account in the Fund falls below $500 as the result of a redemption or an exchange request. Shareholders will be notified in writing that the value of their account in the Fund is less than $500 and will be allowed 30 days to make additional investments before the redemption is processed. The transaction fee applicable to each Fund will not be charged when Shares are involuntarily redeemed.

Other Redemption Information. Redemption proceeds for Shares of a Fund recently purchased by check may not be distributed until payment for the purchase has been collected, which may take up to fifteen days from the purchase date. Shareholders can avoid this delay by utilizing the wire purchase option.

Other than as described above, payment of the redemption proceeds will be made within seven days after receipt of an order for a redemption. The Company may suspend the right of redemption or postpone the date at times when the NYSE is closed or under any emergency circumstances as determined by the SEC.

If the Board of Directors determines that it would be detrimental to the best interests of the remaining shareholders of a Fund to make payment wholly or partly in cash, redemption proceeds may be paid in whole or in part by an in-kind distribution of readily marketable securities held by the Fund instead of cash in conformity with applicable rules of the SEC. Investors generally will incur brokerage charges on the sale of portfolio securities so received in the payment of redemptions. The Company has elected, however, to be governed by Rule 18f-1 under the 1940 Act, so that each Fund is obligated to redeem its Shares solely in cash up to the lesser of $250,000 or 1% of its NAV during any 90-day period for any one shareholder of the Fund.

Proper Form. You must include complete and accurate required information on your redemption request. Please see “Redemption of Fund Shares” for instructions. Redemption requests not in proper form may be delayed.

Exchange Privilege

The exchange privilege is available to shareholders residing in any state in which the Shares being acquired may be legally sold. A shareholder may exchange Investor Class Shares of any Robeco Investment Fund for Investor Class Shares of another Robeco Investment Fund, up to six (6) times per year (one exchange per calendar month). Such an exchange will be effected at the NAV of the exchanged Investor Class Shares and the NAV of the Investor Class Shares to be acquired next determined after PNC Global Investment Servicing’s receipt of a request for an exchange. An exchange of Fund Shares held for less than 60 days (with the exception of Shares purchased through dividend reinvestment or the reinvestment of capital gains) will be subject to a transaction fee of 1.00%. An exchange of Shares will be treated as a sale for federal income tax purposes. A shareholder may make an exchange by sending a written request to the Transfer Agent or, if authorized, by telephone (see “Redemption by Telephone” above). Defined contribution plans are not subject to the above exchange limitations, including any applicable redemption fee.

If the exchanging shareholder does not currently own Investor Class Shares of a Fund, a new account will be

- 28 -

established with the same registration, dividend and capital gain options as the account from which Shares are exchanged, unless otherwise specified in writing by the shareholder with all signatures guaranteed. See “Redemption by Mail” for information on signature guarantees. The exchange privilege may be modified or terminated at any time, or from time to time, by a Fund, upon 60 days’ written notice to shareholders.

If a shareholder wants to exchange shares into a new account in a Fund, the dollar value of the Shares acquired must equal or exceed the Fund’s minimum investment requirement for a new account. If a shareholder wants to exchange shares into an existing account, the dollar value of the shares must equal or exceed the Fund’s minimum investment requirement for additional investments. If an amount remains in a Fund from which the exchange is being made that is below the minimum account value required, the account will be subject to involuntary redemption.

The Funds’ exchange privilege is not intended to afford shareholders a way to speculate on short-term movements in the market. Accordingly, in order to prevent excessive use of the exchange privilege, which may potentially disrupt the management of a Fund and increase transaction costs, each Fund has established a policy of limiting excessive exchange activity. Shareholders are entitled to six (6) exchange redemptions (one exchange per calendar month) from each Fund during any twelve-month period. Notwithstanding these limitations, each Fund reserves the right to reject any purchase request (including exchange purchases from other Robeco Investment Funds) that is deemed to be disruptive to efficient portfolio management.

Dividends and Distributions

Each Fund will distribute substantially all of its net investment income and net realized capital gains, if any, to its shareholders. All distributions are reinvested in the form of additional full and fractional Shares of the Fund unless a shareholder elects otherwise.

Each Fund will declare and pay dividends from net investment income annually. Ordinary income for the Funds in certain circumstances may be “qualified dividend income” taxable to individual shareholders at a maximum 15% U.S. federal income tax rate. Net realized capital gains (including net short-term capital gains), if any, will be distributed by the Funds at least annually. The estimated amount of any annual distribution will be posted to Robeco’s website at www.robecoinvest.com or a free copy may be obtained by calling (888) 261-4073.

The Funds may pay additional distributions and dividends at other times if necessary for the Fund to avoid U.S. federal tax. The Funds’ distributions and dividends, whether received in cash or reinvested in additional Fund Shares, are subject to U.S. federal income tax.

Taxes

The following is a summary of certain United States tax considerations relevant under current law, which may be subject to change in the future. Except where otherwise indicated, the discussion relates to investors who are individual United States citizens or residents. You should consult your tax adviser for further information regarding federal, state, local and/or foreign tax consequences relevant to your specific situation.

Federal Taxes. Each Fund contemplates distributing as dividends each year all or substantially all of its taxable income, including its net capital gain (the excess of net long-term capital gain over net short-term capital loss). Except as otherwise discussed below, you will be subject to federal income tax on Fund distributions regardless of whether they are paid in cash or reinvested in additional shares. Fund distributions attributable to short-term capital gains and net investment income will generally be taxable to you as ordinary income, except as discussed below.

Distributions attributable to the net capital gain of a Fund will be taxable to you as long-term capital gain, no matter how long you have owned your Fund shares. The maximum long-term capital gain rate applicable to individuals, estates, and trusts is currently 15%. You will be notified annually of the tax status of distributions to you.

Distributions of “qualifying dividends” will also generally be taxable to you at long-term capital gain rates, as long as certain requirements are met. In general, if 95% or more of the gross income of a Fund (other than net capital gain) consists of dividends received from domestic corporations or “qualified” foreign corporations (“qualifying dividends”), then all distributions paid by the Fund to individual shareholders will be taxed at long-term

- 29 -

capital gains rates. But if less than 95% of the gross income of a Fund (other than net capital gain) consists of qualifying dividends, then distributions paid by the Fund to individual shareholders will be qualifying dividends only to the extent they are derived from qualifying dividends earned by the Fund. For the lower rates to apply, you must have owned your Fund shares for at least 61 days during the 121-day period beginning on the date that is 60 days before the Fund’s ex-dividend date (and the Fund will need to have met a similar holding period requirement with respect to the shares of the corporation paying the qualifying dividend). The amount of a Fund’s distributions that qualify for this favorable treatment may be reduced as a result of the Fund’s securities lending activities (if any), a high portfolio turnover rate or investments in debt securities or “non-qualified” foreign corporations.

Distributions from a Fund will generally be taxable to you in the taxable year in which they are paid, with one exception. Distributions declared by a Fund in October, November or December and paid in January of the following year are taxed as though they were paid on December 31.

A portion of distributions paid by a Fund to shareholders that are corporations may also qualify for the dividends received deduction for corporations, subject to certain holding period requirements and debt financing limitations.

The Funds may be subject to foreign withholding or foreign taxes on income or gain from certain foreign securities. If more than 50% of the assets of a Fund consist of foreign securities, that Fund may make an election to treat a proportionate amount of those taxes as constituting a distribution to each shareholder, which would allow you either (i) to credit that proportionate amount of taxes against U.S. Federal income tax liability as a foreign tax credit or (ii) to take that amount as an itemized deduction.

If you purchase shares just before a distribution, the purchase price will reflect the amount of the upcoming distribution, but you will be taxed on the entire amount of the distribution received, even though, as an economic matter, the distribution simply constitutes a return of capital. This is known as “buying into a dividend.”

Sales and Exchanges. You will generally recognize taxable gain or loss for federal income tax purposes on a sale, exchange or redemption of your shares, including an exchange for shares of another Fund, based on the difference between your tax basis in the shares and the amount you receive for them. Generally, you will recognize long-term capital gain or loss if you have held your Fund shares for over twelve months at the time you dispose of them. (To aid in computing your tax basis, you should retain your account statements for the periods during which you held shares.)

Any loss realized on shares held for six months or less will be treated as a long-term capital loss to the extent of any capital gain dividends that were received on the shares. Additionally, any loss realized on a disposition of shares of a Fund may be disallowed under “wash sale” rules to the extent the shares disposed of are replaced with other shares of the same Fund within a period of 61 days beginning 30 days before and ending 30 days after the shares are disposed of, such as pursuant to a dividend reinvestment in shares of a Fund. If disallowed, the loss will be reflected in an upward adjustment to the basis of the shares acquired.

IRAs and Other Tax-Qualified Plans. The one major exception to the preceding tax principles is that distributions on, and sales, exchanges and redemptions of, shares held in an IRA (or other tax-qualified plan) will not be currently taxable.

Backup Withholding. The Funds may be required in certain cases to withhold and remit to the Internal Revenue Service a percentage of taxable dividends or gross proceeds realized upon sale payable to shareholders who have failed to provide a correct tax identification number in the manner required, or who are subject to withholding by the Internal Revenue Service for failure to properly include on their return payments of taxable interest or dividends, or who have failed to certify to the Fund that they are not subject to backup withholding when required to do so or that they are “exempt recipients.” The current withholding rate is 28%.

U.S. Tax Treatment of Foreign shareholders. For nonresident aliens, foreign corporations and other foreign investors, Fund distributions attributable to net capital gains of each Fund will generally be exempt from U.S. tax, but all other Fund distributions will generally be subject to a 30% withholding tax. The withholding tax

- 30 -

may, however, be reduced (and, in some cases, eliminated) under an applicable tax treaty between the United States and a shareholder’s country of residence or incorporation, provided that the shareholder furnishes the Fund with a properly completed Form W-8BEN to establish entitlement for these treaty benefits.

Foreign shareholders will generally not be subject to U.S. tax on gains realized on sale, exchange or redemption of shares in the Funds.

Different U.S. tax rules may apply to a foreign shareholder, however, if the investment in a Fund is connected to a trade or business of the shareholder in the United States or the shareholder is present in the United States for 183 days or more in a year.

All foreign investors should consult their own tax advisors regarding the tax consequences in their country of residence of an investment in the Funds.

State and Local Taxes. You may also be subject to state and local taxes on income and gain from Fund shares. State income taxes may not apply, however, to the portions of a Fund’s distributions, if any, that are attributable to interest on U.S. government securities. You should consult your tax adviser regarding the tax status of distributions in your state and locality.

Sunset of Tax Provisions. Some of the tax provisions described above are subject to sunset provisions. Specifically, a sunset provision provides that the 15% long-term capital gain rate and the taxation of dividends at the long-term capital gain rate will change after 2010.

More information about taxes is contained in the SAI.

Multi-Class Structure

Each Fund also offers Institutional Class Shares, which are offered directly to institutional investors without distribution fees in a separate prospectus. Shares of each class of a Fund represent equal pro rata interests in the Fund and accrue dividends and calculate NAV and performance quotations in the same manner. The performance of each class is quoted separately due to different actual expenses. The total return on Investor Class Shares of a Fund can be expected to differ from the total return on Institutional Class Shares of the same Fund. Information concerning other classes of the Funds can be requested by calling the Funds at (888) 261-4073.

NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR MAKE ANY REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS OR IN THE FUNDS’ SAI INCORPORATED HEREIN BY REFERENCE, IN CONNECTION WITH THE OFFERING MADE BY THIS PROSPECTUS AND, IF GIVEN OR MADE, SUCH REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY OR ITS DISTRIBUTOR. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY THE COMPANY OR BY THE DISTRIBUTOR IN ANY JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY BE MADE.

- 31 -

ROBECO INVESTMENT FUNDS

of

The RBB Fund, Inc.

(888) 261-4073

http://www.robecoinvest.com

For More Information:

This Prospectus contains important information you should know before you invest. Read it carefully and keep it for future reference. More information about the SAM Sustainable Global Active Fund and SAM Sustainable Themes Fund is available free of charge, upon request, including:

Annual/Semi–Annual Reports

These reports contain additional information about the Funds’ investments, describe the Funds’ performance, list portfolio holdings, and discuss recent market conditions and economic trends. The annual report includes fund strategies that significantly affected the Funds’ performance during their last fiscal year. When available, the annual and semi-annual reports to shareholders may be obtained by visiting http://www.robecoinvest.com.

Statement of Additional Information

An SAI, dated [                        ], 2009 has been filed with the SEC. The SAI, which includes additional information about the SAM Sustainable Global Active Fund and SAM Sustainable Themes Fund, may be obtained free of charge, along with the annual and semi–annual reports, when available, by calling (888) 261-4073. The SAI, as supplemented from time to time, is incorporated by reference into this prospectus (and is legally part of the prospectus). The SAI is not available on the Adviser’s website because a copy may be obtained by calling (888) 261-4073.

Shareholder Inquiries

Representatives are available to discuss account balance information, mutual fund prospectuses, literature, programs and services available. Hours: 8 a.m. to 6 p.m. (Eastern time) Monday–Friday. Call: (888) 261-4073 or visit the website of Robeco Investment Management at http://www.robecoinvest.com.

Purchases and Redemptions

Call (888) 261-4073.

Written Correspondence

Street Address:

Robeco Investment Funds, c/o PNC Global Investment Servicing, 101 Sabin Street, Pawtucket, RI 02860-1427 P.O. Box Address:

Robeco Investment Funds, c/o PNC Global Investment Servicing, P.O. Box 9816, Providence, RI 02940

Securities and Exchange Commission

You may view and copy information about the Company and the Funds, including the SAI, by visiting the SEC’s Public Reference Room in Washington, DC or the EDGAR Database on the SEC’s Internet site at www.sec.gov. You may also obtain copies of Fund documents by paying a duplicating fee and sending an electronic request to the following e-mail address: publicinfo@sec.gov, or by sending your written request and a duplicating fee to the SEC’s Public Reference Section, Washington, DC 20549-0102. You may obtain information on the operation of the public reference room by calling the SEC at (202) 551-8090.

INVESTMENT COMPANY ACT FILE NO. 811–05518

- 32 -

Subject to Completion

Preliminary Statement of Additional Information Dated January 26, 2009

Information contained herein pertaining to the SAM Sustainable Global Active Fund and SAM Sustainable Themes Fund of The RBB Fund, Inc. is subject to completion or amendment. A post-effective amendment to The RBB Fund, Inc.’s registration statement relating to shares of the SAM Sustainable Global Active Fund and SAM Sustainable Themes Fund has been filed with the Securities and Exchange Commission. Shares of the SAM Sustainable Global Active Fund and SAM Sustainable Themes Fund may not be sold nor may offers to buy shares of such Funds be accepted prior to the time the post-effective amendment to the registration statement becomes effective. This Statement of Additional Information shall not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of shares of the SAM Sustainable Global Active Fund and SAM Sustainable Themes Fund in any state in which such offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of any such state.

STATEMENT OF

ADDITIONAL INFORMATION

ROBECO INVESTMENT FUNDS

of

The RBB Fund, Inc.

Institutional Class

SAM Sustainable Global Active Fund

SAM Sustainable Themes Fund

Investor Class

SAM Sustainable Global Active Fund

SAM Sustainable Themes Fund

[                    ], 2009

This Statement of Additional Information (“SAI”) provides information about the SAM Sustainable Global Active Fund (“Sustainable Global Active Fund”) and SAM Sustainable Themes Fund (“Sustainable Themes Fund”) (each, a “Fund,” and together, the “Funds”). The Funds are series of The RBB Fund, Inc. (the “Company”). This information is in addition to the information contained in the Institutional Class and Investor Class shares’ Prospectuses of the Funds dated [                    ], 2009 (each, a “Prospectus” and together, the “Prospectuses”).

This SAI is not a prospectus. It should be read in conjunction with the Prospectuses. Copies of the Prospectuses may be obtained by calling toll-free (888) 261-4073. The audited financial statements and related report of Ernst & Young LLP, the independent registered public accounting firm for each Fund, will be available in the Funds’ Annual Report for the period ending August 31, 2009. The Funds’ Annual Report (when available) may be obtained upon request and without charge may be obtained by calling toll-free (888) 261-4073.

TABLE OF CONTENTS

-i-

GENERAL INFORMATION

The Company is an open-end management investment company currently operating twenty separate portfolios. The Company is registered under the Investment Company Act of 1940, as amended, (the “1940 Act”) and was organized as a Maryland corporation on February 29, 1988. This SAI pertains to the Institutional Class and Investor Class shares representing interests in two non-diversified Robeco Investment Funds, which are offered by the Prospectuses. Sustainable Asset Management USA, Inc. (“SAM” or the “Adviser”), an affiliate of Robeco Investment Management Inc. (“Robeco”), serves as the investment adviser to the Funds.

INVESTMENT INSTRUMENTS AND POLICIES

The following supplements the information contained in the Prospectuses concerning the investment objectives and policies of the Funds.

The Sustainable Global Active Fund seeks to provide long-term growth of capital primarily through investment in equity securities.

The Sustainable Themes Fund seeks to provide long-term growth of capital primarily through investment in equity securities.

The Adviser may not necessarily invest in all of the instruments or use all of the investment techniques permitted by the Funds’ Prospectuses and this SAI, or invest in such instruments or engage in such techniques to the full extent permitted by the Funds’ investment policies and limitations.

Asset-Backed Securities. The Funds may invest in asset-backed securities, which represent participations in, or are secured by and payable from, pools of assets such as motor vehicle installment sale contracts, installment loan contracts, leases of various types of real and personal property, receivables from revolving credit (credit card) agreements and other categories of receivables. Asset-backed securities may also be collateralized by a portfolio of U.S. government securities, but are not direct obligations of the U.S. government, its agencies or instrumentalities. Such asset pools are securitized through the use of privately-formed trusts or special purpose corporations. Payments or distributions of principal and interest on asset-backed securities may be guaranteed up to certain amounts and for a certain time period by a letter of credit or a pool insurance policy issued by a financial institution unaffiliated with the trust or corporation, or other credit enhancements may be present; however privately issued obligations collateralized by a portfolio of privately issued asset-backed securities do not involve any government-related guarantee or insurance. Asset-backed securities present credit risks that are not presented by mortgage-backed securities. That is because asset-backed securities generally do not have the benefit of a security interest in collateral that is comparable to mortgage assets. See “Risk Factors Associated with Mortgage-Backed Securities.”

1

Bank and Corporate Obligations. Each Fund may purchase obligations of issuers in the banking industry, such as short-term obligations of bank holding companies, certificates of deposit, bankers’ acceptances and time deposits issued by U.S. or foreign banks or savings institutions having total assets at the time of purchase in excess of $1 billion. Investment in obligations of foreign banks or foreign branches of U.S. banks may entail risks that are different from those of investments in obligations of U.S. banks due to differences in political, regulatory and economic systems and conditions. The Funds may also make interest-bearing savings deposits in commercial and savings banks in amounts not in excess of 5% of its total assets.

The Funds may invest in debt obligations, such as bonds and debentures, issued by corporations and other business organizations that are rated at the time of purchase within the three highest ratings categories of Standard & Poor’s^® (“S&P”), Fitch, Inc. / Fitch Ratings Ltd. (“Fitch”) or Moody’s Investors, Inc. (“Moody’s”) (or which, if unrated, are determined by the Adviser to be of comparable quality). Unrated securities will be determined to be of comparable quality to rated debt obligations if, among other things, other outstanding obligations of the issuers of such securities are rated A or better. See Appendix “A” to this SAI for a description of corporate debt ratings. An issuer of debt obligations may default on its obligation to pay interest and repay principal. Also, changes in the financial strength of an issuer or changes in the credit rating of a security may affect its value.

Borrowing. Each Fund may borrow up to 33 1/3 percent of its respective total assets. The Adviser intends to borrow only for temporary or emergency purposes, including to meet portfolio redemption requests so as to permit the orderly disposition of portfolio securities, or to facilitate settlement transactions on portfolio securities. Investments will not be made when borrowings exceed 5% of a Fund’s total assets. Although the principal of such borrowings will be fixed, a Fund’s assets may change in value during the time the borrowing is outstanding. Each Fund expects that some of its borrowings may be made on a secured basis. In such situations, either the custodian will segregate the pledged assets for the benefit of the lender or arrangements will be made with a suitable subcustodian, which may include the lender. If the securities held by a Fund should decline in value while borrowings are outstanding, the net asset value (“NAV”) of the Fund’s outstanding shares will decline in value by proportionately more than the decline in value suffered by the Fund’s securities. As a result, a Fund’s share price may be subject to greater fluctuation until the borrowing is paid off. A Fund’s short sales and related borrowings are not subject to the restrictions outlined above.

Commercial Paper. Each Fund may purchase commercial paper rated (at the time of purchase) “A-1” by S&P^® or “Prime-1” by Moody’s or, when deemed advisable by the Adviser, issues rated “A-2” or “Prime-2” by S&P^® or Moody’s, respectively. These rating categories are described in Appendix “A” to this SAI. The Funds may also purchase unrated commercial paper provided that such paper is determined to be of comparable quality by the Adviser pursuant to guidelines approved by the Company’s Board of Directors. Commercial paper issues in which a Fund may invest include securities issued by corporations without registration under the Securities Act of 1933, as amended (the “Securities Act”) in reliance on the exemption from such registration afforded by Section 3(a) (3) thereof, and commercial paper issued in reliance on the so-called “private placement” exemption from registration, which is afforded by Section 4(2) of the Securities Act (“Section 4(2) paper”). Section 4(2) paper is restricted as to disposition under the federal securities laws in that any resale must similarly be made in an exempt transaction. Section 4(2) paper is normally resold to other institutional investors through or with the assistance of investment dealers who make a market in Section 4(2) paper, thus providing liquidity. Each Fund does not presently intend to invest more than 5% of its net assets in commercial paper.

2

Convertible Securities and Preferred Stocks. The Funds may invest in convertible securities. A convertible security is a bond, debenture, note, preferred stock or other security that may be converted into or exchanged for a prescribed amount of common stock of the same or a different issuer within a particular period of time at a specified price or formula. A convertible security entitles the holder to receive interest paid or accrued on debt or the dividend paid on preferred stock until the convertible security matures or is redeemed, converted or exchanged. Before conversion, convertible securities have characteristics similar to nonconvertible debt securities in that they ordinarily provide a stable stream of income with generally higher yields than those of common stocks of the same or similar issuers. Convertible securities rank senior to common stock in a corporation’s capital structure but are usually subordinated to comparable nonconvertible securities. While no securities investment is completely without risk, investments in convertible securities generally entail less risk than the corporation’s common stock, although the extent to which such risk is reduced depends in large measure upon the degree to which the convertible security sells above its value as a fixed income security. Convertible securities have unique investment characteristics in that they generally: (1) have higher yields than common stocks, but lower yields than comparable non-convertible securities; (2) are less subject to fluctuation in value than the underlying stock since they have fixed income characteristics; and (3) provide the potential for capital appreciation if the market price of the underlying common stock increases.

The value of a convertible security is a function of its “investment value” (determined by its yield in comparison with the yields of other securities of comparable maturity and quality that do not have a conversion privilege) and its “conversion value” (the security’s worth, at market value, if converted into the underlying common stock). The investment value of a convertible security is influenced by changes in interest rates, with investment value declining as interest rates increase and increasing as interest rates decline. The credit standing of the issuer and other factors also may have an effect on the convertible security’s investment value. The conversion value of a convertible security is determined by the market price of the underlying common stock. If the conversion value is low relative to the investment value, the price of the convertible security is governed principally by its investment value. Generally the conversion value decreases as the convertible security approaches maturity. To the extent the market price of the underlying common stock approaches or exceeds the conversion price, the price of the convertible security will be increasingly influenced by its conversion value. A convertible security generally will sell at a premium over its conversion value by the extent to which investors place value on the right to acquire the underlying common stock while holding a fixed income security.

A convertible security might be subject to redemption at the option of the issuer at a price established in the convertible security’s governing instrument. If a convertible security held by a Fund is called for redemption, that Fund will be required to permit the issuer to redeem the security, convert it into the underlying common stock or sell it to a third party. The Funds do not presently intend to invest more than 5% of each Fund’s respective net assets, in convertible securities, or securities received by a Fund upon conversion thereof.

3

Preferred stocks are securities that represent an ownership interest in a company and provide their owner with claims on the company’s earnings and assets prior to the claims of owners of common stocks but after those of bond owners. Preferred stocks in which the Funds may invest include sinking fund, convertible, perpetual fixed and adjustable rate (including auction rate) preferred stocks. There is no minimum credit rating applicable to a Fund’s investment in preferred stocks and securities convertible into or exchangeable for common stock.

Credit Default Swaps, Interest Rate Swaps, Mortgage Swaps, Currency Swaps, Total Return Swaps, Options on Swaps and Interest Rate Caps, Floors and Collars. The Funds may enter into credit default, interest rate and total return swaps. The Funds may also enter into interest rate caps, floors and collars. In addition, a Fund may enter into mortgage swaps and currency swaps.

The Funds may enter into swap transactions for hedging purposes or to seek to increase total return. As examples, a Fund may enter into swap transactions for the purpose of attempting to obtain or preserve a particular return or spread at a lower cost than obtaining a return or spread through purchases and/or sales of instruments in other markets, to protect against currency fluctuations, as a duration management technique, to protect against any increase in the price of securities the Fund anticipates purchasing at a later date, or to gain exposure to certain markets in an economical way.

Swap agreements are two party contracts entered into primarily by institutional investors. In a standard “swap” transaction, two parties agree to exchange the returns (or differentials in rates of return) earned or realized on particular predetermined investments or instruments, which may be adjusted for an interest factor. The gross returns to be exchanged or “swapped” between the parties are generally calculated with respect to a “notional amount,” i.e., the return on or increase in value of a particular dollar amount invested at a particular interest rate, in a particular foreign currency or security, or in a “basket” of securities representing a particular index. As examples, credit default swaps involve the receipt of floating or fixed rate payments in exchange for assuming potential credit losses of an underlying security. Credit default swaps give one party to a transaction the right to dispose of or acquire an asset (or group of assets), or the right to receive from or make a payment to the other party, upon the occurrence of specified credit events. Interest rate swaps involve the exchange by a Fund with another party of their respective commitments to pay or receive interest, such as an exchange of fixed-rate payments for floating rate payments. Mortgage swaps are similar to interest rate swaps in that they represent commitments to pay and receive interest. The notional principal amount, however, is tied to a reference pool or pools of mortgages. Currency swaps involve the exchange of the parties’ respective rights to make or receive payments in specified currencies. Total return swaps are contracts that obligate a party to pay or receive interest in exchange for payment by the other party of the total return generated by a security, a basket of securities, an index, or an index component.

The purchase of an interest rate cap entitles the purchaser, to the extent that a specified index exceeds a predetermined interest rate, to receive payment of interest on a notional principal amount from the party selling such interest rate cap. The purchase of an interest rate floor entitles the purchaser, to the extent that a specified index falls below a predetermined interest rate, to receive payments of interest on a notional principal amount from the party selling the interest rate floor. An interest rate collar is the combination of a cap and a floor that preserves a certain return within a predetermined range of interest rates.

4

A great deal of flexibility is possible in the way swap transactions are structured. However, generally a Fund will enter into credit default, interest rate, total return and mortgage swaps on a net basis, which means that the two payment streams are netted out, with a Fund receiving or paying, as the case may be, only the net amount of the two payments. Credit default, interest rate, total return and mortgage swaps do not normally involve the delivery of securities, other underlying assets or principal. Accordingly, the risk of loss with respect to credit default, interest rate, total return and mortgage swaps is normally limited to the net amount of payments that a Fund is contractually obligated to make. If the other party to a credit default, interest rate, total return or mortgage swap defaults, the Fund’s risk of loss consists of the net amount of payments that the Fund is contractually entitled to receive, if any. In contrast, currency swaps may involve the delivery of the entire principal amount of one designated currency in exchange for the other designated currency. Therefore, the entire principal value of a currency swap is subject to the risk that the other party to the swap will default on its contractual delivery obligations.

A credit default swap may have as reference obligations one or more securities that may, or may not, be currently held by a Fund. The protection “buyer” in a credit default swap is generally obligated to pay the protection “seller” an upfront or a periodic stream of payments over the term of the swap provided that no credit event, such as a default, on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. A Fund may be either the buyer or seller in the transaction. If the Fund is a buyer and no credit event occurs, the Fund may recover nothing if the swap is held through its termination date. However, if a credit event occurs, the buyer generally may elect to receive the full notional value of the swap in exchange for an equal face amount of deliverable obligations of the reference entity whose value may have significantly decreased. As a seller, a Fund generally receives an upfront payment or a rate of income throughout the term of the swap provided that there is no credit event. As the seller, a Fund would effectively add leverage to its portfolio because, in addition to its total net assets, a Fund would be subject to investment exposure on the notional amount of the swap. If a credit event occurs, the value of any deliverable obligation received by a Fund as seller, coupled with the upfront or periodic payments previously received, may be less than the full notional value it pays to the buyer, resulting in a loss of value to the Fund.

To the extent that a Fund’s exposure in a transaction involving a swap or an interest rate floor, cap or collar is covered by the segregation of cash or liquid assets, or is covered by other means in accordance with SEC guidance, the Fund and the Adviser believe that the transactions do not constitute senior securities under the Act and, accordingly, will not treat them as being subject to a Fund’s borrowing restrictions.

A Fund will not enter into any credit default, interest rate, total return or mortgage swap transactions unless the unsecured commercial paper, senior debt or claims-paying ability of the other party thereto is rated investment grade by S&P’s or Moody’s, or, if unrated by such rating organization, determined to be of comparable quality by the Adviser. If there is a default by the other party to such a transaction, the Fund will have contractual remedies pursuant to the agreements related to the transaction.

5

The use of credit default, interest rate, mortgage, total return and currency swaps, as well as interest rate caps, floors and collars, is a highly specialized activity which involves investment techniques and risks different from those associated with ordinary portfolio securities transactions. The use of a swap requires an understanding not only of the referenced asset, reference rate, or index but also of the swap itself, without the benefit of observing the performance of the swap under all possible market conditions. If the Adviser is incorrect in its forecasts of market values, credit quality, interest rates and currency exchange rates, the investment performance of the Fund would be less favorable than it would have been if these investment instruments were not used.

Equity Markets. The Funds invest primarily in equity markets at all times. Equity markets can be highly volatile, so that investing in the Funds involves substantial risk. As a result, investing in the Funds involves the risk of loss of capital.

European Currency Unification. As of January 1, 1999, the European Economic and Monetary Union (EMU) introduced a new single currency called the euro. The euro has replaced the national currencies of many European countries. The new European Central Bank has control over each member country’s monetary policies. Therefore, the member countries no longer control their own monetary policies by directing independent interest rates for their currencies. The national governments of the participating countries, however, have retained the authority to set tax and spending policies and public debt levels.

The change to the euro as a single currency is still relatively new. The elimination of currency risk among EMU countries has affected the economic environment and behavior of investors, particularly in European markets, but the long-term impact of those changes on currency values or on the business or financial condition of European countries and issuers, and issuers in other regions, whose securities the Fund may hold, or the impact, if any, on Fund performance, cannot fully be assessed at this time. In addition, the introduction of the euro presents other unique uncertainties, including the fluctuation of the euro relative to non-euro currencies; whether the interest rate, tax and labor regimes of European countries participating in the euro will converge over time; and whether the conversion of the currencies of other countries that now are or may in the future become members of the European Union (“EU”) will have an impact on the euro. Also, it is possible that the euro could be abandoned in the future by countries that have already adopted its use. These or other events, including political and economic developments, could cause market disruptions, and could adversely affect the value of securities held by the Funds.

Exchange-Traded Funds (ETFs). Each Fund may invest in open-end investment companies whose shares are listed for trading on a national securities exchange or the Nasdaq Market System. ETF shares typically trade like shares of common stock and provide investment results that generally correspond to the price and yield performance of the component stocks of a widely recognized index such as the S&P 500^® Index. There can be no assurance, however, that this can be accomplished as it may not be possible for an ETF to replicate the composition and relative weightings of the securities of its corresponding index. ETFs are subject to risks of an investment in a broadly based portfolio of common stocks, including the risk that the general

6

level of stock prices may decline, thereby adversely affecting the value of suck investment. Individual shares of an ETF are generally not redeemable at their net asset value, but trade on an exchange during the day at prices that are normally close to, but not the same as, their net asset value. There is no assurance that an active trading market will be maintained for the shares of an ETF or that market prices of the shares of an ETF will be close to their net asset values.

Investments in securities of ETFs beyond the limitations set forth in Section 12(d)(1)(A) of the 1940 Act are subject to certain terms and conditions set forth in an exemptive order issued by the SEC to the exchange-traded fund. Section 12(d)(1)(A) states that a mutual fund may not acquire shares of other investment companies, such as ETFs, in excess of: 3% of the total outstanding voting stock of the investment company; 5% of its total assets invested in the investment company; or more than 10% of the fund’s total assets were to be invested in the aggregate in all investment companies. The purchase of shares of ETFs may result in duplication of expenses, including advisory fees, in addition to a mutual fund’s own expenses.

Each Fund may also acquire investment company shares received or acquired as dividends, through offers of exchange or as a result of reorganization, consolidation or merger. The purchase of shares of other investment companies may result in duplication of expenses such that investors indirectly bear a proportionate share of the expenses of such mutual funds including operating costs and investment advisory and administrative fees.

Foreign Securities. Each Fund may invest in securities of foreign issuers either directly or through American Depositary Receipts (“ADRs”) Global Depositary Receipts (“GDRs”), European Depositary Receipts (“EDRs”) or International Depositary Receipts (“IDRs”). ADRs are securities, typically issued by a U.S. financial institution (a “depository”), that evidence ownership interests in a security or pool of securities issued by a foreign issuer and deposited with the depository. ADRs may be listed on a national securities exchange or may trade in the over-the-counter market. ADR prices are denominated in U.S. dollars; the underlying security may be denominated in a foreign currency. GDRs, EDRs and IDRs are securities that represent ownership interests in a security or pool of securities issued by a non-U.S. or U.S. corporation. Depositary receipts may be available through “sponsored” or “unsponsored” facilities. A sponsored facility is established jointly by the issuer of the security underlying the receipt and the depository, whereas an unsponsored facility is established by the depository without participation by the issuer of the underlying security. Holders of unsponsored depositary receipts generally bear all of the costs of the unsponsored facility. The depository of an unsponsored facility is frequently under no obligation to distribute shareholder communications received from the issuer of the deposited security or to pass through, to the holders of the receipts, voting rights with respect to the deposited securities. The depository of unsponsored depositary receipts may provide less information to receipt holders. Investments in depositary receipts do not eliminate the risks in investing in foreign issuers. The underlying security may be subject to foreign government taxes, which would reduce the yield on such securities.

Investments in foreign securities involve higher costs than investments in U.S. securities, including higher transaction costs as well as the imposition of additional taxes by foreign governments. In addition, foreign investments may include additional risks associated with currency exchange rates, less complete financial information about the issuers, less market liquidity and political stability. Volume and liquidity in most foreign bond markets are less than in the United States and, at times, volatility or price can be greater than in the United States.

7

Future political and economic information, the possible imposition of withholding taxes on interest income, the possible seizure or nationalization of foreign holdings, the possible establishment of exchange controls, or the adoption of other governmental restrictions, might adversely affect the payment of principal and interest on foreign obligations. Inability to dispose of Fund securities due to settlement problems could result either in losses to a Fund due to subsequent declines in value of the securities, or, if the Fund has entered into a contract to sell the securities, could result in possible liability to the purchaser. Individual foreign economies may differ favorably or unfavorably from the U.S. economy in such respects as growth or gross national product, rate of inflation, capital reinvestment, resource self-sufficiency and balance of payments position.

Fixed commissions on foreign securities exchanges are generally higher than negotiated commissions on U.S. exchanges, although the Funds endeavor to achieve the most favorable net results on their portfolio transactions. There is generally less government supervision and regulation of securities exchanges, brokers, dealers and listed companies than in the United States.

Settlement mechanics (e.g., mail service between the United States and foreign countries) may be slower or less reliable than within the United States, thus increasing the risk of delayed settlements of portfolio transactions or loss of certificates for portfolio securities. Foreign markets also have different clearance and settlement procedures, and in certain markets there have been times when settlements have been unable to keep pace with the volume of securities transactions, making it difficult to conduct such transactions. Such delays in settlement could result in temporary periods when a portion of the assets of a Fund is uninvested and no return is earned thereon. The inability of the Funds to make intended security purchases due to settlement problems could cause a Fund to miss attractive investment opportunities.

Although the Funds may invest in securities denominated in foreign currencies, each Fund values its securities and other assets in U.S. dollars. As a result, the NAV of a Fund’s shares may fluctuate with U.S. dollar exchange rates as well as the price changes of the Fund’s securities in the various local markets and currencies. Thus, an increase in the value of the U.S. dollar compared to the currencies in which a Fund makes its investments could reduce the effect of increases and magnify the effect of decreases in the price of the Fund’s securities in their local markets. Conversely, a decrease in the value of the U.S. dollar may have the opposite effect of magnifying the effect of increases and reducing the effect of decreases in the prices of a Fund’s securities in its foreign markets. In addition to favorable and unfavorable currency exchange rate developments, each Fund is subject to the possible imposition of exchange control regulations or freezes on convertibility of currency.

Each Fund may invest in obligations of foreign branches of U.S. banks (Eurodollars) and U.S. branches of foreign banks (Yankee dollars) as well as foreign branches of foreign banks. These investments involve risks that are different from investments in securities of U.S. banks, including potential unfavorable political and economic developments, different tax provisions, seizure of foreign deposits, currency controls, interest limitations or other governmental restrictions which might affect payment of principal or interest. The Funds may also invest in Yankee bonds, which are issued by foreign governments and their agencies and foreign corporations, but pay interest in U.S. dollars and are typically issued in the United States.

8

Investing in Emerging Countries. Under normal market conditions, each Fund expects that its investment in securities of issuers located in emerging countries will not exceed 30% of their respective total assets. The securities markets of emerging countries are less liquid and subject to greater price volatility, and have a smaller market capitalization, than the U.S. securities markets. In certain countries, there may be fewer publicly traded securities and the market may be dominated by a few issues or sectors. Issuers and securities markets in such countries are not subject to as extensive and frequent accounting, financial and other reporting requirements or as comprehensive government regulations as are issuers and securities markets in the U.S. In particular, the assets and profits appearing on the financial statements of emerging country issuers may not reflect their financial position or results of operations in the same manner as financial statements for U.S. issuers. Substantially less information may be publicly available about emerging country issuers than is available about issuers in the United States.

Emerging country securities markets are typically marked by a high concentration of market capitalization and trading volume in a small number of issuers representing a limited number of industries, as well as a high concentration of ownership of such securities by a limited number of investors. The markets for securities in certain emerging countries are in the earliest stages of their development. Even the markets for relatively widely traded securities in emerging countries may not be able to absorb, without price disruptions, a significant increase in trading volume or trades of a size customarily undertaken by institutional investors in the securities markets of developed countries. The limited size of many of these securities markets can cause prices to be erratic for reasons apart from factors that affect the soundness and competitiveness of the securities issuers. For example, prices may be unduly influenced by traders who control large positions in these markets. Additionally, market making and arbitrage activities are generally less extensive in such markets, which may contribute to increased volatility and reduced liquidity of such markets. The limited liquidity of emerging country securities may also affect a Fund’s ability to accurately value its portfolio securities or to acquire or dispose of securities at the price and time it wishes to do so or in order to meet redemption requests.

With respect to investments in certain emerging market countries, antiquated legal systems may have an adverse impact on the Funds. For example, while the potential liability of a shareholder in a U.S. corporation with respect to acts of the corporation is generally limited to the amount of the shareholder’s investment, the notion of limited liability is less clear in certain emerging market countries. Similarly, the rights of investors in emerging market companies may be more limited than those of shareholders in U.S. corporations.

Transaction costs, including brokerage commissions or dealer mark-ups, in emerging countries may be higher than in the United States and other developed securities markets. In addition, existing laws and regulations are often inconsistently applied. As legal systems in emerging countries develop, foreign investors may be adversely affected by new or amended laws and regulations. In circumstances where adequate laws exist, it may not be possible to obtain swift and equitable enforcement of the law.

Foreign investment in the securities markets of certain emerging countries is restricted or controlled to varying degrees. These restrictions may limit a Fund’s investment in certain emerging countries and may increase the expenses of the Fund. Certain emerging countries require governmental approval prior to investments by foreign persons or limit investment by foreign persons to only a specified percentage of an issuer’s outstanding securities or a specific class of

9

securities which may have less advantageous terms (including price) than securities of the company available for purchase by nationals. In addition, the repatriation of both investment income and capital from emerging countries may be subject to restrictions which require governmental consents or prohibit repatriation entirely for a period of time. Even where there is no outright restriction on repatriation of capital, the mechanics of repatriation may affect certain aspects of the operation of a Fund. A Fund may be required to establish special custodial or other arrangements before investing in certain emerging countries.

Emerging countries may be subject to a substantially greater degree of economic, political and social instability and disruption than is the case in the United States, Japan and most Western European countries. This instability may result from, among other things, the following: (i) authoritarian governments or military involvement in political and economic decision making, including changes or attempted changes in governments through extra-constitutional means; (ii) popular unrest associated with demands for improved political, economic or social conditions; (iii) internal insurgencies; (iv) hostile relations with neighboring countries; (v) ethnic, religious and racial disaffection or conflict; and (vi) the absence of developed legal structures governing foreign private investments and private property. Such economic, political and social instability could disrupt the principal financial markets in which the Funds may invest and adversely affect the value of the Funds’ assets. A Fund’s investments can also be adversely affected by any increase in taxes or by political, economic or diplomatic developments.

Each Fund may seek investment opportunities within former “east bloc” countries in Eastern Europe. Most Eastern European countries had a centrally planned, socialist economy for a substantial period of time. The governments of many Eastern European countries have more recently been implementing reforms directed at political and economic liberalization, including efforts to decentralize the economic decision-making process and move towards a market economy. However, business entities in many Eastern European countries do not have an extended history of operating in a market-oriented economy, and the ultimate impact of Eastern European countries’ attempts to move toward more market-oriented economies is currently unclear. In addition, any change in the leadership or policies of Eastern European countries may halt the expansion of or reverse the liberalization of foreign investment policies now occurring and adversely affect existing investment opportunities.

The economies of emerging countries may differ unfavorably from the U.S. economy in such respects as growth of gross domestic product, rate of inflation, capital reinvestment, resources, self-sufficiency and balance of payments. Many emerging countries have experienced in the past, and continue to experience, high rates of inflation. In certain countries inflation has at times accelerated rapidly to hyperinflationary levels, creating a negative interest rate environment and sharply eroding the value of outstanding financial assets in those countries. Other emerging countries, on the other hand, have recently experienced deflationary pressures and are in economic recessions. The economies of many emerging countries are heavily dependent upon international trade and are accordingly affected by protective trade barriers and the economic conditions of their trading partners. In addition, the economies of some emerging countries are vulnerable to weakness in world prices for their commodity exports.

A Fund’s income and, in some cases, capital gains from foreign stocks and securities will be subject to applicable taxation in certain of the countries in which it invests, and treaties between the U.S. and such countries may not be available in some cases to reduce the otherwise applicable tax rates. See “Taxation.”

10

Foreign markets also have different clearance and settlement procedures, and in certain markets there have been times when settlements have been unable to keep pace with the volume of securities transactions, making it difficult to conduct such transactions. Such delays in settlement could result in temporary periods when a portion of the assets of a Fund remain uninvested and no return is earned on such assets. The inability of a Fund to make intended security purchases or sales due to settlement problems could result either in losses to the Fund due to subsequent declines in value of the portfolio securities or, if the Fund has entered into a contract to sell the securities, could result in possible liability to the purchaser.

Forward Commitment and When-Issued Transactions. Each Fund may purchase or sell securities on a when-issued or forward commitment basis (subject to its investment policies and restrictions). These transactions involve a commitment by a Fund to purchase or sell securities at a future date (ordinarily one or two months later). The price of the underlying securities (usually expressed in terms of yield) and the date when the securities will be delivered and paid for (the settlement date) are fixed at the time the transaction is negotiated. When-issued purchases and forward commitments are negotiated directly with the other party, and such commitments are not traded on exchanges. A Fund will not enter into such transactions for the purpose of leverage.

When-issued purchases and forward commitments enable a Fund to lock in what is believed by the Adviser to be an attractive price or yield on a particular security for a period of time, regardless of future changes in interest rates. For instance, in periods of rising interest rates and falling prices, a Fund might sell securities it owns on a forward commitment basis to limit its exposure to falling prices. In periods of falling interest rates and rising prices, a Fund might sell securities it owns and purchase the same or a similar security on a when-issued or forward commitment basis, thereby obtaining the benefit of currently higher yields. When-issued securities or forward commitments involve a risk of loss if the value of the security to be purchased declines prior to the settlement date.

The value of securities purchased on a when-issued or forward commitment basis and any subsequent fluctuations in their value are reflected in the computation of a Fund’s NAV starting on the date of the agreement to purchase the securities, and the Fund is subject to the rights and risks of ownership of the securities on that date. A Fund does not earn interest on the securities it has committed to purchase until they are paid for and delivered on the settlement date. When a Fund makes a forward commitment to sell securities it owns, the proceeds to be received upon settlement are included in the Fund’s assets. Fluctuations in the market value of the underlying securities are not reflected in the Fund’s NAV as long as the commitment to sell remains in effect. Settlement of when-issued purchases and forward commitment transactions generally takes place within two months after the date of the transaction, but a Fund may agree to a longer settlement period.

A Fund will make commitments to purchase securities on a when-issued basis or to purchase or sell securities on a forward commitment basis only with the intention of completing the transaction and actually purchasing or selling the securities. If deemed advisable as a matter of investment strategy, however, a Fund may dispose of or renegotiate a commitment after it is

11

entered into. A Fund also may sell securities it has committed to purchase before those securities are delivered to the Fund on the settlement date. A Fund may realize a capital gain or loss in connection with these transactions, and its distributions from any net realized capital gains will be taxable to shareholders.

When a Fund purchases securities on a when-issued or forward commitment basis, the fund or its custodian will maintain in a segregated account cash or liquid securities having a value (determined daily) at least equal to the amount of the Fund’s purchase commitments. These procedures are designed to ensure that the Fund will maintain sufficient assets at all times to cover its obligations under when-issued purchases and forward commitments.

Forward Foreign Currency Transactions. The Funds may to the extent that it invests in foreign securities, enter into forward foreign currency exchange contracts in order to protect against uncertainty in the level of future foreign currency exchange rates. The Funds will conduct its foreign currency exchange transactions either on a spot (i.e., cash) basis at the spot rate prevailing in the foreign currency exchange market, or through entering into forward contracts to purchase or sell foreign currencies. A forward foreign currency exchange contract involves an obligation to purchase or sell a specific currency at a future date, which may be any fixed number of days (usually less than one year) from the date of the contract agreed upon by the parties, at a price set at the time of the contract. These contracts are traded in the interbank market conducted directly between traders (usually large commercial banks) and their customers. A forward contract generally has no deposit requirement, and no commissions are charged at any stage for trades. Although foreign exchange dealers do not charge a fee for conversion, they do realize a profit based on the difference (the spread) between the price at which they are buying and selling various currencies.

A Fund is permitted to enter into forward contracts under two circumstances. First, when a Fund enters into a contract for the purchase or sale of a security quoted or denominated in a foreign currency, it may desire to “lock in” the U.S. dollar price of the security. By entering into a forward contract for the purchase or sale, for a fixed number of U.S. dollars, of the amount of foreign currency involved in the underlying security transactions, the Funds will be able to insulate itself from a possible loss resulting from a change in the relationship between the U.S. dollar and the subject foreign currency during the period between the date on which the security is purchased or sold and the date on which payment is made or received.

Second, when the Adviser believes that the currency of a particular foreign country may suffer a substantial decline against the U.S. dollar, it may cause a Fund to enter a forward contract to sell, for a fixed U.S. dollar amount, the amount of foreign currency approximating the value of some or all of a Fund’s portfolio securities quoted or denominated in such foreign currency. The precise matching of the forward contract amounts and the value of the securities involved will not generally be possible since the future value of such securities in foreign currencies will change as a consequence of market movements in the value of those securities between the date the forward contract is entered into and the date it matures.

Although the Funds have no current intention to do so, they may engage in cross-hedging by using forward contracts in one currency to hedge against fluctuations in the value in securities denominated or quoted in a different currency if the Adviser determines that there is a pattern of correlation between the two currencies. Cross-hedging may also include entering into a forward

12

transaction involving two foreign currencies, using one foreign currency as a proxy for the U.S. dollar to hedge against variations in the other U.S. foreign currency, if the Adviser determines that there is a pattern of correlation between the proxy currency and the U.S. dollar.

The Funds will not enter into forward contracts to sell currency or maintain a net exposure to such contracts if the consummation of such contracts would obligate the Funds to deliver an amount of foreign currency in excess of the value of the Funds’ respective portfolio securities or other assets quoted or denominated in that currency. At the consummation of the forward contract, the Funds may either make delivery of the foreign currency or terminate its contractual obligation by purchasing an offsetting contract obligating it to purchase at the same maturity date, the same amount of such foreign currency. If a Fund chooses to make delivery of foreign currency, it may be required to obtain such delivery through the sale of portfolio securities quoted or denominated in such currency or through conversion of other assets of a Fund into such currency. If a Fund engages in an offsetting transaction, the Fund will realize a gain or a loss to the extent that there has been a change in forward contract prices. Closing purchase transactions with respect to forward contracts are usually effected with the currency trader who is party to the original forward contract.

The Funds’ transactions in forward contracts will be limited to those described above. Of course, a Fund is not required to enter into such transactions with regard to its foreign currency quoted or denominated securities, and a Fund will not do so unless deemed appropriate by the Adviser.

When entering into a forward contract, the Funds will segregate either cash or liquid securities quoted or denominated in any currency in an amount equal to the value of the Funds’ total assets committed to the consummation of forward currency exchange contracts which require the Funds to purchase a foreign currency. If the value of the segregated securities declines, additional cash or securities will be segregated by the Funds on a daily basis so that the value of the segregated securities will equal the amount of the Funds’ commitments with respect to such contracts.

This method of protecting the value of the Funds’ portfolio securities against a decline in the value of a currency does not eliminate fluctuations in the underlying prices of the securities. It simply establishes a rate of exchange which can be achieved at some future point in time. The precise projection of short-term currency market movements is not possible, and short-term hedging provides a means of fixing the U.S. dollar value of only a portion of the Funds’ foreign assets. It also reduces any potential gain which may have otherwise occurred had the currency value increased above the settlement price of the contract.

While the Funds may enter into forward contracts to seek to reduce currency exchange rate risks, transactions in such contracts involve certain other risks. Thus, while the Funds may benefit from such transactions, unanticipated changes in currency prices may result in a poorer overall performance for the Funds than if it had not engaged in any such transactions. Moreover, there may be imperfect correlation between the Funds’ portfolio holdings or securities quoted or denominated in a particular currency and forward contracts entered into by the Funds. Such imperfect correlation may cause the Funds to sustain losses, which will prevent the Funds from achieving a complete hedge, or expose the Funds to the risk of foreign exchange loss.

13

Forward contracts are subject to the risks that the counterparty to such contract will default on its obligations. Since a forward foreign currency exchange contract is not guaranteed by an exchange or clearing house, a default on the contract would deprive the Funds of unrealized profits, transaction costs or the benefits of a currency hedge or force the Funds to cover its purchase or sale commitments, if any, at the current market price.

The Funds’ foreign currency transactions (including related options, futures and forward contracts) may be limited by the requirements of Subchapter M of the Internal Revenue Code of 1986, as amended (the “Code”) for qualification as a regulated investment company.

Futures Contracts. The Funds may invest in futures contracts. A futures contract may generally be described as an agreement between two parties to buy and sell particular financial instruments for an agreed price during a designated month (or to deliver the final cash settlement price, in the case of a contract relating to an index or otherwise not calling for physical delivery at the end of trading in the contract). When interest rates are rising or securities prices are falling, a Fund can seek to offset a decline in the value of its current portfolio securities through the sale of futures contracts. When interest rates are falling or securities prices are rising, a Fund, through the purchase of futures contracts, can attempt to secure better rates or prices than might later be available in the market when it effects anticipated purchases.

To seek to increase total return, to equalize cash or to hedge against changes in interest rates or securities prices may purchase and sell various kinds of futures contracts, and purchase and write call and put options on any of such futures contracts. A Fund may also enter into closing purchase and sale transactions with respect to any of such contracts and options. The futures contracts may be based on various securities (such as U.S. government securities), securities indices, and any other financial instruments and indices. A Fund will engage in futures and related options transactions for bona fide hedging purposes as described below or for purposes of seeking to increase total return, in each case, only to the extent permitted by regulations of the Commodity Futures Trading Commission (“CFTC”). All futures contracts entered into by a Fund are traded on U.S. exchanges or boards of trade that are licensed and regulated by the CFTC or on foreign exchanges.

Positions taken in the futures markets are not normally held to maturity but are instead liquidated through offsetting transactions, which may result in a profit or a loss. While futures contracts on securities will usually be liquidated in this manner, a Fund may instead make, or take, delivery of the underlying securities or currency whenever it appears economically advantageous to do so. A clearing corporation associated with the exchange on which futures on securities are traded guarantees that, if still open, the sale or purchase will be performed on the settlement date.

Hedging, by use of futures contracts, seeks to establish with more certainty than would otherwise be possible the effective price or rate of return on portfolio securities or securities that a Fund proposes to acquire or the exchange rate of currencies in which portfolio securities are quoted or denominated. A Fund may, for example, take a “short” position in the futures market by selling futures contracts to seek to hedge against an anticipated rise in interest rates or a decline in market prices that would adversely affect the value of the Fund’s portfolio securities. Such futures contracts may include contracts for the future delivery of securities held by a Fund or securities with characteristics similar to those of the Fund’s portfolio securities. If, in the

14

opinion of the Adviser, there is a sufficient degree of correlation between price trends for a Fund’s portfolio securities and futures contracts based on other financial instruments, securities indices or other indices, the Fund may also enter into such futures contracts as part of its hedging strategy. Although under some circumstances prices of securities in a Fund’s portfolio may be more or less volatile than prices of such futures contracts, the Adviser will attempt to estimate the extent of this volatility difference based on historical patterns and compensate for any such differential by having the Fund enter into a greater or lesser number of futures contracts or by seeking to achieve only a partial hedge against price changes affecting the Fund’s portfolio securities. When hedging of this character is successful, any depreciation in the value of portfolio securities will be substantially offset by appreciation in the value of the futures position. On the other hand, any unanticipated appreciation in the value of a Fund’s portfolio securities would be substantially offset by a decline in the value of the futures position.

On other occasions, a Fund may take a “long” position by purchasing futures contracts. This would be done, for example, when a Fund anticipates the subsequent purchase of particular securities when it has the necessary cash, but expects the prices then available in the applicable market to be less favorable than prices that are currently available.

Holding Company Depository Receipts. The Funds may invest in Holding Company Depository Receipts (“HOLDRS”). HOLDRS represent trust-issued receipts that represent individual and undivided beneficial ownership interests in the common stock or American Depositary Receipts (“ADRs”) of specific companies in a particular industry, sector or group. Each of the Funds do not presently intend to invest more than 5% of their respective net assets in HOLDRS.

Restricted and Illiquid Securities. The Funds may not invest more than 15% of each Fund’s respective net assets in illiquid securities, including securities that are illiquid by virtue of the absence of a readily available market or legal or contractual restrictions on resale. Illiquid securities include: repurchase agreements and time deposits with a notice or demand period of more than seven days; interest rate; currency, mortgage and credit default swaps; interest rate caps; floors and collars; municipal leases; certain restricted securities, such as those purchased in a private placement of securities, unless it is determined, based upon a review of the trading markets for a specific restricted security, that such restricted security is liquid; and certain over-the-counter options. Securities that have legal or contractual restrictions on resale but have a readily available market are not considered illiquid for purposes of this limitation. With respect to each Fund, repurchase agreements subject to demand are deemed to have a maturity equal to the notice period.

Mutual funds do not typically hold a significant amount of restricted or other illiquid securities because of the potential for delays on resale and uncertainty in valuation. Limitations on resale may have an adverse effect on the marketability of portfolio securities and a mutual fund might be unable to dispose of restricted or other illiquid securities promptly or at reasonable prices and might thereby experience difficulty in satisfying redemptions within seven days. A mutual fund might also have to register such restricted securities in order to dispose of them resulting in additional expense and delay. Adverse market conditions could impede such a public offering of securities.

15

Each Fund may purchase securities which are not registered under the Securities Act but which may be sold to “qualified institutional buyers” in accordance with Rule 144A under the Securities Act (“Restricted Securities”). These securities will not be considered illiquid so long as it is determined by the Adviser that an adequate trading market exists for the securities. This investment practice could have the effect of increasing the level of illiquidity in a Fund during any period that qualified institutional buyers become uninterested in purchasing restricted securities.

The Adviser will monitor the liquidity of Restricted Securities held by a Fund under the supervision of the Company’s Board of Directors. In reaching liquidity decisions, the Adviser may consider, among others, the following factors: (1) the unregistered nature of the security; (2) the frequency of trades and quotes for the security; (3) the number of dealers wishing to purchase or sell the security and the number of other potential purchasers; (4) dealer undertakings to make a market in the security; and (5) the nature of the security and the nature of the marketplace trades (e.g., the time needed to dispose of the security, the method of soliciting offers and the mechanics of the transfer).

The purchase price and subsequent valuation of Restricted Securities normally reflect a discount from the price at which such securities trade when they are not restricted, since the restriction makes them less liquid. The amount of the discount from the prevailing market price is expected to vary depending upon the type of security, the character of the issuer, the party who will bear the expenses of registering the Restricted Securities and prevailing supply and demand conditions.

Indexed Securities. The Funds may invest in indexed securities whose value is linked to securities indices. Most such securities have values which rise and fall according to the change in one or more specified indices, and may have characteristics similar to direct investments in the underlying securities. Depending on the index, such securities may have greater volatility than the market as a whole.

The Funds may also invest in exchange-traded funds, which generally track their related indices and trade like an individual stock throughout the trading day. An example would be Standard & Poor’s Depositary Receipts (commonly referred to as “Spiders”), which are exchange-traded shares of a closed-end investment company that are designed to replicate the price performance and dividend yield of the Standard & Poor’s 500^® Composite Stock Price Index.

Initial Public Offerings. Each of the Funds may purchase stock in an initial public offering (“IPO”). An IPO is a company’s first offering of stock to the public. Risks associated with IPOs may include considerable fluctuation in the market value of IPO shares due to certain factors, such as the absence of a prior public market, unseasoned trading, a limited number of shares available for trading, lack of information about the issuer and limited operating history. The purchase of IPO shares may involve high transaction costs. When a Fund’s asset base is small, a significant portion of the Fund’s performance could be attributable to investments in IPOs, because such investments would have a magnified impact on the Fund. As a Fund’s assets grow, the effect of the Fund’s investments in IPOs on the Fund’s performance probably will decline, which could reduce the Fund’s performance. Because of the price volatility of IPO shares, a Fund may choose to hold IPO shares for a very short period of time. This may increase the turnover of the Fund’s portfolio and may lead to increased expenses to the Fund, such as commissions and transaction costs. In addition, the Adviser cannot guarantee continued access to IPOs.

16

Investment Company Securities. Each Fund may invest in securities issued by other investment companies to the extent permitted by the 1940 Act. Under the 1940 Act, each Fund’s investments in such securities currently are limited to, subject to certain exceptions, (i) 3% of the total voting stock of any one investment company, (ii) 5% of the Fund’s total assets with respect to any one investment company and (iii) 10% of the Fund’s total assets with respect to investment companies in the aggregate. Investments in the securities of other investment companies will involve duplication of advisory fees and certain other expenses. Rule 12d1-1 under the 1940 Act permits a Fund to invest an unlimited amount of its uninvested cash in a money market fund so long as, among other things, said investment is consistent with the Fund’s investment objectives and policies. As a shareholder in an investment company, a Fund would bear its pro rata portion of the investment company’s expenses, including advisory fees, in addition to its own expenses.

Lending of Portfolio Securities. Each Fund may lend its portfolio securities to financial institutions in accordance with the investment restrictions described below. Such loans would involve risks of delay in receiving additional collateral in the event the value of the collateral decreased below the value of the securities loaned or of delay in recovering the securities loaned or even loss of rights in the collateral should the borrower of the securities fail financially. However, loans will be made only to borrowers deemed by the Adviser to be of good standing and only when, in the Adviser’s judgment, the income to be earned from the loans justifies the attendant risks. Any loans of a Fund’s securities will be fully collateralized and marked to market daily.

Market Fluctuation. The market value of each Fund’s investments, and thus each Fund’s NAV, will change in response to market conditions affecting the value of its portfolio securities. When interest rates decline, the value of fixed rate obligations can be expected to rise. Conversely, when interest rates rise, the value of fixed rate obligations can be expected to decline. In contrast, as interest rates on adjustable rate loans are reset periodically, yields on investments in such loans will gradually align themselves to reflect changes in market interest rates, causing the value of such investments to fluctuate less dramatically in response to interest rate fluctuations than would investments in fixed rate obligations. Because the investment alternatives available to each Fund may be limited by the specific objective of that Fund, investors should be aware that an investment in a particular Fund may be subject to greater market fluctuation than an investment in a portfolio of securities representing a broader range of investment alternatives. In view of the specialized nature of the investment activities of each Fund, an investment in any single Fund should not be considered a complete investment program.

Micro-Cap, Small-Cap and Mid-Cap Stocks. The Funds may invest in securities of companies with micro-, small- and mid-size capitalizations tend to be riskier than securities of companies with large capitalizations. This is because micro-, small- and mid-cap companies typically have smaller product lines and less access to liquidity than large cap companies, and are therefore more sensitive to economic downturns. In addition, growth prospects of micro-, small- and mid-cap companies tend to be less certain than large cap companies, and the dividends paid on micro-, small- and mid-cap stocks are frequently negligible. Moreover, micro-, small-

17

and mid-cap stocks have, on occasion, fluctuated in the opposite direction of large cap stocks or the general stock market. Consequently, securities of micro-, small- and mid-cap companies tend to be more volatile than those of large-cap companies. The market for micro- and small-cap securities may be thinly traded and as a result, greater fluctuations in the price of micro- and small-cap securities may occur.

Money Market Instruments. Each Fund may invest a portion of its assets in short-term, high-quality instruments for purposes of temporary defensive measures which include, among other things, bank obligations. Bank obligations include bankers’ acceptances, negotiable certificates of deposit, and non-negotiable time deposits earning a specified return and issued by a U.S. bank which is a member of the Federal Reserve System or insured by the Bank Insurance Fund of the Federal Deposit Insurance Corporation (“FDIC”), or by a savings and loan association or savings bank which is insured by the Savings Association Insurance Fund of the FDIC. Such deposits are not FDIC insured and the Fund bears the risk of bank failure. Bank obligations also include U.S. dollar-denominated obligations of foreign branches of U.S. banks and obligations of domestic branches of foreign banks. Such investments may involve risks that are different from investments in securities of domestic branches of U.S. banks. These risks may include future unfavorable political and economic developments, possible withholding taxes on interest income, seizure or nationalization of foreign deposits, currency controls, interest limitations, or other governmental restrictions which might affect the payment of principal or interest on the securities held in a Fund. Additionally, these institutions may be subject to less stringent reserve requirements and to different accounting, auditing, reporting and recordkeeping requirements than those applicable to domestic branches of U.S. banks. A Fund will invest in obligations of domestic branches of foreign banks and foreign branches of domestic banks only when the Adviser believes that the risks associated with such investment are minimal. The value of money market instruments tends to fall when current interest rates rise. Money market instruments are generally less sensitive to interest rate changes than longer-term securities.

Mortgage-Backed Securities. Certain Funds may invest in mortgage pass-through certificates and multiple-class pass-through securities, such as real estate mortgage investment conduits (“REMIC”) pass-through certificates and collateralized mortgage obligations (“CMOs”).

Guaranteed mortgage pass-through securities represent participation interests in pools of residential mortgage loans and are issued by U.S. governmental or private lenders and guaranteed by the U.S. government or one of its agencies or instrumentalities, including but not limited to the Government National Mortgage Association (“Ginnie Mae”), Federal National Mortgage Association (“Fannie Mae”) and the Federal Home Loan Mortgage Corporation (“Freddie Mac”). Ginnie Mae certificates are guaranteed by the full faith and credit of the U.S. government for timely payment of principal and interest on the certificates. Fannie Mae and Freddie Mac certificates are not backed by the full faith and credit of the U.S. government. Fannie Mae certificates are guaranteed by Fannie Mae, a federally chartered and privately owned corporation, for full and timely payment of principal and interest on the certificates. Fannie Mae is authorized to borrow from the U.S. Treasury to meet its obligations. Freddie Mac certificates are guaranteed by Freddie Mac, a corporate instrumentality of the U.S. government, for timely payment of interest and the ultimate collection of all principal of the related mortgage loans.

18

CMOs and REMIC pass-through or participation certificates may be issued by, among others, U.S. government agencies and instrumentalities as well as private lenders. CMOs and REMIC certificates are issued in multiple classes and the principal of and interest on the mortgage assets may be allocated among the several classes of CMOs or REMIC certificates in various ways. Each class of CMOs or REMIC certificates, often referred to as a “tranche,” is issued at a specific adjustable or fixed interest rate and must be fully retired no later than its final distribution date. Generally, interest is paid or accrues on all classes of CMOs or REMIC certificates on a monthly basis.

Typically, CMOs are collateralized by Ginnie Mae, Fannie Mae or Freddie Mac certificates but also may be collateralized by other mortgage assets such as whole loans or private mortgage pass-through securities. Debt service on CMOs is provided from payments of principal and interest on collateral of mortgaged assets and any reinvestment income thereon.

A REMIC is a CMO that qualifies for special tax treatment under the Code and invests in certain mortgages primarily secured by interests in real property and other permitted investments. Investors may purchase “regular” and “residual” interest shares of beneficial interest in REMIC trusts although the Funds do not intend to invest in residual interests.

Certain Funds may invest in mortgage-backed securities issued by trusts or other entities formed or sponsored by private originators of and institutional investors in mortgage loans and other non-governmental entities (or representing custodial arrangements administered by such institutions). These private originators and institutions include savings and loan associations, mortgage bankers, commercial banks, insurance companies, investment banks and special purpose subsidiaries of the foregoing.

Privately issued mortgage-backed securities are generally backed by pools of conventional (i.e., non-government guaranteed or insured) mortgage loans. Since such mortgage-backed securities normally are not guaranteed by an entity having the credit standing of Ginnie Mae, Fannie Mae or Freddie Mac, in order to receive a high quality rating from the rating organizations (e.g., S&P’s or Moody’s), they often are structured with one or more types of “credit enhancement.” Such credit enhancement falls into two categories: (1) liquidity protection and (2) protection against losses resulting after default by a borrower and liquidation of the collateral (e.g., sale of a house after foreclosure). Liquidity protection refers to the payment of cash advances to holders of mortgage-backed securities when a borrower on an underlying mortgage fails to make its monthly payment on time. Protection against losses resulting after default and liquidation is designed to cover losses resulting when, for example, the proceeds of a foreclosure sale are insufficient to cover the outstanding amount on the mortgage. Such protection may be provided through guarantees, insurance policies or letters of credit, through various means of structuring the securities or through a combination of such approaches.

Examples of credit enhancement arising out of the structure of the transaction include “senior-subordinated securities” (multiple class securities with one or more classes entitled to receive payment before other classes, with the result that defaults on the underlying mortgages are borne first by the holders of the subordinated class), creation of “spread accounts” or “reserve funds” (where cash or investments are held in reserve against future losses) and “over-collateralization” (where the scheduled payments on the underlying mortgages in a pool exceed the amount required to be paid on the mortgage-backed securities). The

19

degree of credit enhancement for a particular issue of mortgage-backed securities is based on the level of credit risk associated with the particular mortgages in the related pool. Losses on a pool in excess of anticipated levels could nevertheless result in losses to security holders since credit enhancement rarely covers every dollar owed on a pool.

Investing in Mortgage-Backed Securities (such as those described above) involves certain risks, including the failure of a counter-party to meet its commitments, adverse interest rate changes and the effects of prepayments on mortgage cash flows. Further, the yield characteristics of Mortgage-Backed Securities differ from those of traditional fixed income securities. The major differences typically include more frequent interest and principal payments (usually monthly), the adjustability of interest rates, and the possibility that prepayments of principal may be made substantially earlier than their final distribution dates.

Prepayment rates are influenced by changes in current interest rates and a variety of economic, geographic, social and other factors and cannot be predicted with certainty. Both adjustable rate mortgage loans and fixed rate mortgage loans may be subject to a greater rate of principal prepayments in a declining interest rate environment and to a lesser rate of principal prepayments in an increasing interest rate environment. Under certain interest rate and prepayment rate scenarios, a Fund may fail to recoup fully its investment in Mortgage-Backed Securities notwithstanding any direct or indirect governmental or agency guarantee. When a Fund reinvests amounts representing payments and unscheduled prepayments of principal, it may receive a rate of interest that is lower than the rate on existing adjustable rate mortgage pass-through securities. Thus, Mortgage-Backed Securities, and adjustable rate mortgage pass-through securities in particular, may be less effective than other types of U.S. government securities as a means of “locking in” interest rates.

Conversely, in a rising interest rate environment, a declining prepayment rate will extend the average life of many Mortgage-Backed Securities. This possibility is often referred to as extension risk. Extending the average life of a Mortgage-Backed Security increases the risk of depreciation due to future increases in market interest rates. The market for certain types of Mortgage-Backed Securities (i.e., certain CMOs) may not be liquid under all interest rate scenarios, which may prevent a Fund from selling such securities held in its portfolio at times or prices that it desires.

Different types of derivative debt securities are subject to different combinations of prepayment, extension and/or interest rate risk. Conventional mortgage pass-through securities and sequential pay CMOs are subject to all of these risks, but are typically not leveraged. Thus, the magnitude of exposure may be less than for more leveraged Mortgage-Backed Securities.

Planned amortization class (“PAC”) and target amortization class (“TAC”) CMO bonds involve less exposure to prepayment, extension and interest rate risk than other Mortgage-Backed Securities, provided that prepayment rates remain within expected prepayment ranges or “collars.” To the extent that prepayment rates remain within these prepayment ranges, the residual or support tranches of PAC and TAC CMOs assume the extra prepayment extension and interest rate risk associated with the underlying mortgage assets.

20

Options on Futures Contracts. The Funds may purchase and sell various kinds of futures contracts, and purchase and write call and put options on any of such futures contracts. The acquisition of put and call options on futures contracts will give a Fund the right (but not the obligation) for a specified price to sell or to purchase, respectively, the underlying futures contract at any time during the option period. As the purchaser of an option on a futures contract, a Fund obtains the benefit of the futures position if prices move in a favorable direction but limits its risk of loss in the event of an unfavorable price movement to the loss of the premium and transaction costs.

The writing of a call option on a futures contract generates a premium, which may partially offset a decline in the value of a Fund’s assets. By writing a call option, a Fund becomes obligated, in exchange for the premium, (upon exercise of the option) to sell a futures contract if the option is exercised, which may have a value higher than the exercise price. Conversely, the writing of a put option on a futures contract generates a premium, which may partially offset an increase in the price of securities that a Fund intends to purchase. However, the Fund becomes obligated (upon exercise of the option) to purchase a futures contract if the option is exercised, which may have a value lower than the exercise price. Thus, the loss incurred by a Fund in writing options on futures is potentially unlimited and may exceed the amount of the premium received. The Funds will incur transaction costs in connection with the writing of options on futures.

The holder or writer of an option on a futures contract may terminate its position by selling or purchasing an offsetting option on the same financial instrument. There is no guarantee that such closing transactions can be effected. A Fund’s ability to establish and close out positions on such options will be subject to the development and maintenance of a liquid market.

The Funds will engage in futures and related options transactions for bona fide hedging and to seek to increase total return as permitted by the CFTC regulations, which permit principals of an investment company, registered under the 1940 Act to engage in such transactions without registering as commodity pool operators. A Fund will determine that the price fluctuations in the futures contracts and options on futures used for hedging purposes are substantially related to price fluctuations in securities held by the Fund or securities or instruments which it expects to purchase. Except as stated below, a Fund’s futures transactions will be entered into for traditional hedging purposes — i.e., futures contracts will be sold to protect against a decline in the price of securities that the Fund owns or futures contracts will be purchased to protect the Fund against an increase in the price of securities it intends to purchase. As evidence of this hedging intent, each Fund expects that on 75% or more of the occasions on which it takes a long futures or option position (involving the purchase of futures contracts), the Fund will have purchased, or will be in the process of purchasing, equivalent amounts of related securities in the cash market at the time when the futures or option position is closed out. However, in particular cases, when it is economically advantageous for a Fund to do so, a long futures position may be terminated or an option may expire without the corresponding purchase of securities or other assets.

Each Fund will engage in transactions in currency forward contracts, futures contracts and options only to the extent such transactions are consistent with the requirements of the Code, for maintaining its qualification as a regulated investment company for federal income tax purposes. See “Taxes.”

21

Transactions in futures contracts and options on futures involve brokerage costs, require margin deposits and, in some cases, may require the applicable Fund to establish a segregated account consisting of cash or liquid securities in an amount equal to the underlying value of such contracts and options.

The use of futures contracts entails certain risks, including but not limited to the following: no assurance that futures contracts transactions can be offset at favorable prices; possible reduction of the Fund’s income due to the use of hedging; possible reduction in value of both the securities hedged and the hedging instrument; possible lack of liquidity due to daily limits on price fluctuations; imperfect correlation between the contract and the securities being hedged; and potential losses in excess of the amount initially invested in the futures contracts themselves. If the expectations of the Adviser regarding movements in securities prices or interest rates are incorrect, the Fund may have experienced better investment results without hedging. The use of futures contracts and options on futures contracts requires special skills in addition to those needed to select portfolio securities.

While transactions in futures contracts and options on futures may reduce certain risks, such transactions themselves entail certain other risks. Thus, while a Fund may benefit from the use of futures and options on futures, unanticipated changes in interest rates or securities prices may result in a poorer overall performance for the Fund than if it had not entered into any futures contracts or options transactions. In the event of an imperfect correlation between a futures position and a portfolio position which is intended to be protected, the desired protection may not be obtained and the Fund may be exposed to risk of loss.

Perfect correlation between a Fund’s futures positions and portfolio positions will be impossible to achieve. There are no futures contracts based upon individual securities, except certain U.S. government securities. Other futures contracts available to hedge the Funds’ portfolio investments generally are limited to futures on various securities indices.

Options on Securities and Securities Indices. The Funds may each write covered call and secured put options on any securities in which it may invest or on any domestic stock indices based on securities in which it may invest. A Fund may purchase and write such options on securities that are listed on national domestic securities exchanges or foreign securities exchanges or traded in the over-the-counter market. A call option written by a Fund obligates the Fund to sell specified securities to the holder of the option at a specified price if the option is exercised at any time before the expiration date, regardless of the market price of the security. All call options written by a Fund are covered, which means that the Fund will own the securities subject to the option so long as the option is outstanding or use the other methods described below. The purpose of a Fund in writing covered call options is to realize greater income than would be realized in portfolio securities transactions alone. However, in writing covered call options for additional income, a Fund may forego the opportunity to profit from an increase in the market price of the underlying security.

A put option written by a Fund obligates the Fund to purchase specified securities from the option holder at a specified price if the option is exercised at any time before the expiration date, regardless of the market price for the security. The purpose of writing such options is to generate additional income. However, in return for the option premium, the Fund accepts the risk that it will be required to purchase the underlying securities at a price in excess of the securities’ market value at the time of purchase.

22

All call and put options written by a Fund are covered. A written call option or put option may be covered by (i) maintaining cash or liquid securities in a segregated account noted on the Fund’s records or maintained by the Fund’s custodian with a value at least equal to the Fund’s obligation under the option, (ii) entering into an offsetting forward commitment and/or (iii) purchasing an offsetting option or any other option which, by virtue of its exercise price or otherwise, reduces the Fund’s net exposure on its written option position.

A Fund may terminate its obligations under an exchange-traded call or put option by purchasing an option identical to the one it has written. Obligations under over-the-counter options may be terminated only by entering into an offsetting transaction with the counterparts to such option. Such purchases are referred to as “closing purchase transactions” and do not result in the ownership of an option. A closing purchase transaction will ordinarily be effected to realize a profit on an outstanding option, to prevent an underlying security from being called, to permit the sale of the underlying security or to permit the writing of a new option containing different terms on such underlying security. The cost of such a liquidation purchase plus transaction costs may be greater than the premium received upon the original option, in which event the Fund will have incurred a loss in the transaction.

A Fund may also write (sell) covered call and put options on any securities index composed of securities in which it may invest. Options on securities indices are similar to options on securities, except that the exercise of securities index options requires cash settlement payments and does not involve the actual purchase or sale of securities. The amount of this settlement will be equal to the difference between the closing price of the of the securities index at the time of exercise and the exercise price of the option expressed in dollars, times a specified amount. In addition, securities index options are designed to reflect price fluctuations in a group of securities or segment of the securities market rather than price fluctuations in a single security.

The Funds may cover call options on a securities index by owning securities whose price changes are expected to be similar to those of the underlying index or by having an absolute and immediate right to acquire such securities without additional cash consideration (or for additional cash consideration held in a segregated account) upon conversion or exchange of other securities in its portfolio. A Fund may also cover call and put options on a securities index by using the other methods described above.

A Fund would normally purchase call options in anticipation of an increase, or put options in anticipation of a decrease (“protective puts”) in the market value of securities of the type in which it may invest. The purchase of a call option would entitle a Fund, in return for the premium paid, to purchase specified securities at a specified price during the option period. A Fund would ordinarily realize a gain on the purchase of a call option if, during the option period, the value of such securities exceeded the sum of the exercise price, the premium paid and transaction costs; otherwise the Fund would realize either no gain or a loss on the purchase of the call option. The purchase of a put option would entitle a Fund, in exchange for the premium paid, to sell specified securities at a specified price during the option period. The purchase of protective puts is designed to offset or hedge against a decline in the market value of a Fund’s securities. Put options may also be purchased by a Fund for the purpose of affirmatively

23

benefiting from a decline in the price of securities which it does not own. A Fund would ordinarily realize a gain if, during the option period, the value of the underlying securities decreased below the exercise price sufficiently to cover the premium and transaction costs; otherwise the Fund would realize either no gain or a loss on the purchase of the put option. Gains and losses on the purchase of put options may be offset by countervailing changes in the value of the underlying portfolio securities.

A Fund may purchase put and call options on securities indices for the same purposes as it may purchase options on securities. Options on securities indices are similar to options on securities, except that the exercise of securities index options requires cash payments and does not involve the actual purchase or sale of securities. In addition, securities index options are designed to reflect price fluctuations in a group of securities or segment of the securities market rather than price fluctuations in a single security.

Transactions by a Fund in options on securities and securities indices will be subject to limitations established by each of the exchanges, boards of trade or other trading facilities on which such options are traded governing the maximum number of options in each class which may be written or purchased by a single investor or group of investors acting in concert, regardless of whether the options are written or purchased on the same or different exchanges, boards of trade or other trading facilities or are held or written in one or more accounts or through one or more brokers. Thus, the number of options that a Fund may write or purchase may be affected by options written or purchased by other investment advisory clients of the Adviser. An exchange, board of trade or other trading facility may order the liquidation of positions found to be in excess of these limits, and it may impose certain other sanctions.

Although the Funds may use option transactions to seek to generate additional income and to seek to reduce the effect of any adverse price movement in the securities or currency subject to the option, they do involve certain risks that are different in some respects from investment risks associated with similar mutual funds, which do not engage in such activities. These risks include the following: for writing call options, the inability to effect closing transactions at favorable prices and the inability to participate in the appreciation of the underlying securities above the exercise price; for writing put options, the inability to effect closing transactions at favorable prices and the obligation to purchase the specified securities or to make a cash settlement on the securities index at prices which may not reflect current market values; and for purchasing call and put options, the possible loss of the entire premium paid. In addition, the effectiveness of hedging through the purchase or sale of securities index options, including options on the S&P 500^® Index, will depend upon the extent to which price movements in the portion of the securities portfolio being hedged correlate with the price movements in the selected securities index. Perfect correlation may not be possible because the securities held or to be acquired by a Fund may not exactly match the composition of the securities index on which options are written. If the forecasts of the Adviser regarding movements in securities prices or interest rates are incorrect, a Fund’s investment results may have been better without the hedge transactions.

There is no assurance that a liquid secondary market on a domestic or foreign options exchange will exist for any particular exchange-traded option or at any particular time. If a Fund is unable to effect a closing purchase transaction with respect to covered options it has written, the Fund will not be able to sell the underlying securities or dispose of assets held in a segregated

24

account until the options expire or are exercised. Similarly, if a Fund is unable to effect a closing sale transaction with respect to options it has purchased, it would have to exercise the options in order to realize any profit and will incur transaction costs upon the purchase or sale of underlying securities or currencies.

Reasons for the absence of a liquid secondary market on an exchange include the following: (i) there may be insufficient trading interest in certain options; (ii) restrictions may be imposed by an exchange on opening transactions or closing transactions or both; (iii) trading halts, suspensions or other restrictions may be imposed with respect to particular classes or series of options; (iv) unusual or unforeseen circumstances may interrupt normal operations on an exchange; (v) the facilities of an exchange or the Options Clearing Corporation may not at all times be adequate to handle current trading volume; or (vi) one or more exchanges could, for economic or other reasons, decide or be compelled at some future date to discontinue the trading of options (or a particular class or series of options), in which event the secondary market on that exchange (or in that class or series of options) would cease to exist although outstanding options on that exchange that had been issued by the Options Clearing Corporation as a result of trades on that exchange would continue to be exercisable in accordance with their terms.

A Fund’s ability to terminate over-the-counter options is more limited than with exchange-traded options and may involve the risk that broker-dealers participating in such transactions will not fulfill their obligations. The Adviser will monitor the liquidity of over-the-counter options and, if it determines that such options are not readily marketable, a Fund’s ability to enter such options will be subject to the Fund’s limitation on investments on illiquid securities.

The writing and purchase of options is a highly specialized activity, which involves investment techniques and risks different from those associated with ordinary portfolio securities transactions. The successful use of options for hedging purposes depends in part on the Adviser’s ability to predict future price fluctuations and the degree of correlation between the options and securities markets.

Portfolio Turnover. Those investment strategies that require periodic changes to portfolio holdings with the expectation of outperforming equity indices are typically referred to as “active” strategies. These strategies contrast with “passive” (“index”) strategies that buy and hold only the stocks in the equity indices. Passive strategies tend to trade infrequently—only as the stocks in the indices change (largely due to changes in the sizes of the companies in the indices, takeovers or bankruptcies). Most equity mutual funds pursue active strategies, which have higher turnover than passive strategies.

The generally higher portfolio turnover of active investment strategies can adversely affect taxable investors, especially those in higher marginal tax brackets, in two ways. First, short-term capital gains, which often accompany higher turnover investment strategies, are currently taxed at ordinary income rates. Ordinary income tax rates are higher than long-term capital gain tax rates for middle and upper income taxpayers. Thus, the tax liability is often higher for investors in active strategies. Second, the more frequent realization of gains caused by higher turnover investment strategies means that taxes will be paid sooner. Such acceleration of the tax liability is financially more costly to investors. Less frequent realization of capital gains allows the payment of taxes to be deferred until later years, allowing more of the gains to compound before taxes are paid. Consequently, after-tax compound rates of return will

25

generally be higher for taxable investors using investment strategies with very low turnover, compared with high turnover strategies. The difference is particularly large when the general market rates of return are higher than average, such as during the majority of the last ten years.

There are no limitations on the length of time that securities must be held by any Fund and a Fund’s annual portfolio turnover rate may vary significantly from year to year. A high rate of portfolio turnover (100% or more) involves correspondingly greater transaction costs, which must be borne by the applicable Fund and its shareholders.

In determining such portfolio turnover, U.S. government securities and all other securities (including options) which have maturities at the time of acquisition of one year or less (“short-term securities”) are excluded. The annual portfolio turnover rate is calculated by dividing the lesser of the cost of purchases or proceeds from sales of portfolio securities for the year by the monthly average of the value of the portfolio securities owned by the applicable Fund during the year. The monthly average is calculated by totaling the values of the portfolio securities as of the beginning and end of the first month of the year and as of the end of the succeeding 11 months and dividing the sum by 13. A turnover rate of 100% would occur if all of a Fund’s portfolio securities (other than short-term securities) were replaced once in a period of one year. It should be noted that if a Fund were to write a substantial number of options, which are exercised, the portfolio turnover rate of that Fund would increase. Increased portfolio turnover results in increased brokerage costs, which a Fund must pay, and the possibility of more short-term gains, distributions of which are taxable as ordinary income.

The Funds will trade their portfolio securities without regard to the length of time for which they have been held. To the extent that a Fund’s portfolio is traded for short-term market considerations and portfolio turnover rate exceeds 100%, the annual portfolio turnover rate of the Fund could be higher than most mutual funds.

Purchase Warrants. Each Fund may invest in purchase warrants and similar rights. Purchase warrants are privileges issued by a corporation which enable the owner to subscribe to and purchase a specified number of shares of the corporation at a specified price during a specified period of time. Subscription rights normally have a short lifespan to expiration. The purchase of warrants involves the risk that the Fund could lose the purchase value of a warrant if the right to subscribe to additional shares is not executed prior to the warrants’ expiration. Also, the purchase of warrants involves the risk that the effective price paid for the warrant added to the subscription price of the related security may exceed the value of the subscribed security’s market price such as when there is no movement in the level of the underlying security. These Funds may not invest more than 5% of each Fund’s respective net assets in purchase warrants and similar rights.

Real Estate Investment Trust Securities. The Funds may invest in real estate investment trusts (“REITs”). REITs generally invest directly in real estate, in mortgages or in some combination of the two. Individual REITs may own a limited number of properties and may concentrate in a particular region or property type. A REIT is a corporation, or a business trust that would otherwise be taxed as a corporation, which meets the definitional requirements of the Code. The Code permits a qualifying REIT to deduct dividends paid, thereby effectively eliminating corporate level Federal income tax and making the REIT a pass-through vehicle for Federal income tax purposes. To meet the definitional requirements of the Code, a REIT must,

26

among other things, invest substantially all of its assets in interests in real estate (including mortgages and other REITs) or cash and government securities, derive most of its income from rents from real property or interest on loans secured by mortgages on real property, and distribute to shareholders annually a substantial portion of its otherwise taxable income.

Generally, REITs can be classified as equity REITs, mortgage REITs and hybrid REITs. Equity REITs invest the majority of their assets directly in real property and derive their income primarily from rents and capital gains from appreciation realized through property sales. Mortgage REITs invest the majority of their assets in real estate mortgages and derive their income primarily from interest payments. Hybrid REITs combine the characteristics of both equity and mortgage REITs. The values of securities issued by REITs are affected by tax and regulatory requirements and by perceptions of management skill. They also are subject to heavy cash flow dependency, defaults by borrowers or tenants, self-liquidation and the possibility of failing to qualify for tax-free status under the Code or to maintain exemption from the 1940 Act.

The REITs in which the Funds may invest may be affected by economic forces and other factors related to the real estate industry. REITs are sensitive to factors such as changes in real estate values, property taxes, interest rates, cash flow of underlying real estate assets, occupancy rates, government regulations affecting zoning, land use and rents, and management skill and creditworthiness of the issuer. Companies in the real estate industry may also be subject to liabilities under environmental and hazardous waste laws. REITS whose underlying assets include long-term health care properties; such as nursing, retirement and assisted living homes, may be impacted by federal regulations concerning the health care industry. Each Fund will indirectly bear its proportionate share of expenses, including management fees, paid by each REIT in which it invests in addition to the expenses of the Fund. Each Fund is also subject to the risk that the REITs in which it invests will fail to qualify for tax-free pass-through of income under the Code, and/or fail to qualify for an exemption from registration as an investment company under the 1940 Act. Mortgage REITs may be affected by the quality of the credit extended. A REIT’s return may be adversely affected when interest rates are high or rising.

Investing in REITs may involve risks similar to those associated with investing in small capitalization companies. REITs may have limited financial resources, may trade less frequently and in a limited volume and may be subject to more abrupt or erratic price movements than larger company securities. Historically, small capitalization stocks, such as REITs, have been more volatile in price than the larger capitalization stocks included in the S&P 500^®.

Repurchase Agreements. The Funds may agree to purchase securities from financial institutions subject to the seller’s agreement to repurchase them at an agreed-upon time and price (“repurchase agreements”). The securities held subject to a repurchase agreement may have stated maturities exceeding 397 days, provided the repurchase agreement itself matures in less than 13 months. Default by or bankruptcy of the seller would, however, expose a Fund to possible loss because of adverse market action or delays in connection with the disposition of the underlying obligations.

The repurchase price under the repurchase agreements described above generally equals the price paid by the Fund plus interest negotiated on the basis of current short-term rates (which may be more or less than the rate on the securities underlying the repurchase agreement). The financial institutions with whom the Funds may enter into repurchase agreements will be banks

27

which the Adviser considers creditworthy pursuant to criteria approved by the Board of Directors and non-bank dealers of U.S. government securities that are listed on the Federal Reserve Bank of New York’s list of reporting dealers. The Adviser will consider the creditworthiness of a seller in determining whether to have the Fund enter into a repurchase agreement. The seller under a repurchase agreement will be required to maintain the value of the securities subject to the agreement at not less than the repurchase price plus accrued interest. The Adviser will mark to market daily the value of the securities, and will, if necessary, require the seller to maintain additional securities, to ensure that the value is not less than the repurchase price.

Default by or bankruptcy of the seller would, however, expose a Fund to possible loss because of adverse market action or delays in connection with the disposition of the underlying obligations.

Reverse Repurchase Agreements. The Funds may enter into reverse repurchase agreements with respect to portfolio securities for temporary purposes (such as to obtain cash to meet redemption requests) when the liquidation of portfolio securities is deemed disadvantageous or inconvenient by the Adviser. Reverse repurchase agreements involve the sale of securities held by a Fund subject to the Fund’s agreement to repurchase the securities at an agreed-upon price, date and rate of interest. Such agreements are considered to be borrowings under the 1940 Act, and may be entered into only for temporary or emergency purposes. While reverse repurchase transactions are outstanding, a Fund will maintain in a segregated account with the Fund’s custodian or a qualified sub-custodian, cash or liquid securities of an amount at least equal to the market value of the securities, plus accrued interest, subject to the agreement and will monitor the account to ensure that such value is maintained. Reverse repurchase agreements involve the risk that the market value of the securities sold by the Fund may decline below the price of the securities the Fund is obligated to repurchase and the interest received on the cash exchanged for the securities.

Risk Considerations of Medium Grade Securities. Obligations in the lowest investment grade (i.e., BBB or Baa), referred to as “medium grade” obligations, have speculative characteristics, and changes in economic conditions and other factors are more likely to lead to weakened capacity to make interest payments and repay principal on these obligations than is the case for higher rated securities. In the event that a security purchased by a Fund is subsequently downgraded below investment grade, the Adviser will consider such event in its determination of whether the Fund should continue to hold the security.

Special Situation Companies. The Funds may invest in “Special Situations.” The term “Special Situation” shall be deemed to refer to a security of a company in which an unusual and possibly non-repetitive development is taking place which, in the opinion of the investment adviser of the Fund, may cause the security to attain a higher market value independently, to a degree, of the trend in the securities market in general. The particular development (actual or prospective), which may qualify a security as a “Special Situation,” may be one of many different types.

Such developments may include, among others, a technological improvement or important discovery or acquisition which, if the expectation for it materialized, would effect a substantial change in the company’s business; a reorganization; a recapitalization or other development involving a security exchange or conversion; a merger, liquidation or distribution

28

of cash, securities or other assets; a breakup or workout of a holding company; litigation which, if resolved favorably, would improve the value of the company’s stock; a new or changed management; or material changes in management policies. A “Special Situation” may often involve a comparatively small company, which is not well known, and which has not been closely watched by investors generally, but it may also involve a large company. The fact, if it exists, that an increase in the company’s earnings, dividends or business is expected, or that a given security is considered to be undervalued, would not in itself be sufficient to qualify as a “Special Situation.” A Fund may invest in securities (even if not “Special Situations”) which, in the opinion of the investment adviser of the Fund, are appropriate investments for the Fund, including securities which the investment adviser of the Fund believes are undervalued by the market. A Fund shall not be required to invest any minimum percentage of its aggregate portfolio in “Special Situations,” nor shall it be required to invest any minimum percentage of its aggregate portfolio in securities other than “Special Situations.”

Securities of Unseasoned Issuers. Each of the Funds may invest in securities of unseasoned issuers, including equity securities of unseasoned issuers which are not readily marketable (a) to the extent consistent with each Fund’s primary investment strategies as set forth in the Prospectuses and with each Fund’s policy on investments in illiquid securities; or (b) 5% of net assets for each of the Funds. The term “unseasoned” refers to issuers which, together with their predecessors, have been in operation for less than three years.

Structured Securities. The Funds may invest up to 5% of their net assets in structured securities to the extent consistent with its investment objective. The value of the principal of and/or interest on structured securities is determined by reference to changes in the value of specific currencies, commodities, securities, indices or other financial indictors (the “Reference”) or the relative change in two or more References. The interest rate or the principal amount payable upon maturity or redemption may be increased or decreased depending upon changes in the applicable Reference. Examples of structured securities include, but are not limited to, notes where the principal repayment at maturity is determined by the value of the relative change in two or more specified securities or securities indices.

The terms of some structured securities may provide that in certain circumstances no principal is due at maturity and, therefore, the Fund could suffer a total loss of its investment. Structured securities may be positively or negatively indexed, so that appreciation of the Reference may produce an increase or decrease in the interest rate or value of the security at maturity. In addition, changes in the interest rate or the value of the security at maturity may be a multiple of the changes in the value of the Reference. Consequently, structured securities may entail a greater degree of market risk than other types of securities. Structured securities may also be more volatile, less liquid and more difficult to accurately price than less complex securities due to their derivative nature.

29

Temporary Investments. Although the Funds invest primarily in equity securities, for temporary defensive purposes, the Funds may hold cash or invest in a variety of money market instruments and short-term and medium-term debt securities including: (a) obligations of the United States or foreign governments, their respective agencies or instrumentalities; (b) bank deposits and bank obligations (including certificates of deposit, time deposits and bankers’ acceptances) of U.S. or foreign banks denominated in any currency; (c) floating rate securities and other instruments denominated in any currency issued by international development agencies; (d) finance company and corporate commercial paper and other short-term corporate debt obligations of U.S. and foreign corporations; and (e) repurchase agreements with banks and broker-dealers with respect to such securities.

U.S. Government Obligations. The Funds may purchase U.S. government agency and instrumentality obligations that are debt securities issued by U.S. government-sponsored enterprises and federal agencies. Some obligations of agencies and instrumentalities of the U.S. government are supported by the full faith and credit of the U.S. government or by U.S. Treasury guarantees, such as securities of the Ginnie Mae and the Federal Housing Authority; others, by the ability of the issuer to borrow, provided approval is granted, from the U.S. Treasury, such as securities of Freddie Mac and others, only by the credit of the agency or instrumentality issuing the obligation, such as securities of Fannie Mae and the Federal Loan Banks. Such guarantees of U.S. government securities held by a Fund do not, however, guarantee the market value of the shares of the Fund. There is no guarantee that the U.S. government will continue to provide support to its agencies or instrumentalities in the future. U.S. government obligations that are not backed by the full faith and credit of the U.S. government are subject to greater risks than those that are backed by the full faith and credit of the U.S. government. All U.S. government obligations are subject to interest rate risk.

Each Fund’s net assets may be invested in obligations issued or guaranteed by the U.S. Treasury or the agencies or instrumentalities of the U.S. government, including, but not limited to, options and futures on such obligations. The maturities of U.S. government securities usually range from three months to thirty years. Examples of types of U.S. government obligations include U.S. Treasury Bills, Treasury Notes and Treasury Bonds and the obligations of Federal Home Loan Banks, Federal Farm Credit Banks, Federal Land Banks, the Federal Housing Administration, Farmers Home Administration, Export-Import Bank of the United States, Small Business Administration, Fannie Mae, Ginnie Mae, General Services Administration, Central Bank for Cooperatives, Freddie Mac, Federal Intermediate Credit Banks, the Maritime Administration, the Asian-American Development Bank and the Inter-American Development Bank. U.S. government securities may include inflation-indexed fixed income securities, such as U.S. Treasury Inflation Protected Securities (TIPS). The interest rate of TIPS, which is set at auction, remains fixed throughout the term of the security and the principal amount of the security is adjusted for inflation. The inflation-adjusted principal is not paid until maturity.

On September 7, 2008, Fannie Mae and Freddie Mac (collectively the “GSEs”) were placed under the conservatorship of the Federal Housing Finance Agency (“FHFA”) to provide stability in the financial markets, mortgage availability and taxpayer protection by preserving the GSEs’ assets and property and putting the GSEs in a sound and solvent condition. Under the conservatorship, the management of the GSEs was replaced. Additionally, the GSEs are expected to modestly increase their mortgage-backed security portfolios through the end of 2009 and then gradually reduce such portfolios at the rate of 10 percent per year until stabilizing at a lower, less risky size.

30

The U.S. Treasury, Fannie Mae and the Federal Reserve acted in collaboration to take the following steps to support the conservatorship. First, the U.S. Treasury and Fannie Mae have established Preferred Stock Purchase Agreements pursuant to which the U.S. Treasury will receive senior preferred equity shares and warrants to ensure that the GSEs maintain a positive net worth. The GSEs’ common and preferred shareholders will bear any losses ahead of the new government senior preferred shares. Second, the U.S. Treasury has established a new secured lending credit facility which will be available to Fannie Mae, Freddie Mac and the FHLBs to assist the entities in funding their regular business activities in the capital markets, until December 31, 2009. Also, the U.S. Treasury has initiated a program to purchase the GSE mortgage-backed securities through December 31, 2009, to aid mortgage affordability.

When-Issued Purchases and Forward Commitments. To the extent consistent with their respective investment objectives, each Fund may purchase securities on a when-issued basis or purchase or sell securities on a forward commitment basis. When a Fund agrees to purchase securities on a when-issued basis or to purchase or sell securities on a forward commitment basis, the custodian will set aside cash, U.S. government securities or other liquid assets equal to the amount of the purchase or the commitment in a separate account. The market value of the separate account will be monitored and if such market value declines, the Fund will subsequently be required to place additional assets in the separate account in order to ensure that the value of the account remains equal to the amount of the Fund’s commitments.

The Funds will make commitments to purchase securities on a when-issued basis or to purchase or sell securities on a forward commitment basis only with the intention of completing the transaction and actually purchasing or selling the securities. If deemed advisable as a matter of investment strategy, however, a Fund may dispose of or renegotiate a commitment after it is entered into, and may sell securities it has committed to purchase before those securities are delivered to the Fund on the settlement date. In these cases, the Fund may realize a capital gain or loss.

The value of the securities underlying a when-issued purchase or a forward commitment to purchase securities, and any subsequent fluctuations in their value, is taken into account when determining a Fund’s NAV starting on the day that the Fund agrees to purchase the securities. The Funds do not earn interest on the securities committed to purchase until the securities are paid for and delivered on the settlement date. When a Fund makes a forward commitment to sell securities, the proceeds to be received upon settlement are included in the Fund’s assets, and fluctuations in the value of the underlying securities are not reflected in the Fund’s NAV as long as the commitment remains in effect.

31

INVESTMENT LIMITATIONS

The Funds have adopted the following fundamental investment limitations which may not be changed with respect to the Funds without the affirmative vote of the holders of a majority of the Funds’ outstanding shares (as defined in Section 2(a) (42) of the 1940 Act). As used in this SAI and in the Prospectuses, “shareholder approval” and a “majority of the outstanding shares” of a Fund means, with respect to the approval of an investment advisory agreement, a distribution plan or a change in a fundamental investment limitation, the lesser of (1) 67% of the shares of the particular Fund represented at a meeting at which the holders of more than 50% of the outstanding shares of such Fund are present in person or by proxy, or (2) more than 50% of the outstanding shares of such Fund. Each Fund’s investment goals and strategies described in the Prospectuses may be changed by the Company’s Board of Directors without the approval of the Fund’s shareholders.

Each Fund may not:

1. Purchase, sell or invest in commodities or commodity contracts or real estate or interests in real estate, except futures contracts on securities and securities indices and options on such futures, forward foreign currency exchange contracts and except that the Fund may purchase, sell or invest in marketable securities of companies holding real estate or interests in real estate, including real estate investment trusts.

2. Make loans except to the extent permitted by the 1940 Act.

3. Borrow money, issue senior securities or mortgage, pledge or hypothecate its assets except to the extent permitted by the 1940 Act, provided, however, that (a) collateral arrangements in connection with short sales, options, futures, options on futures or other permitted investment practices and collateral arrangements with respect to initial or variation margin for such transactions will not be deemed to be a pledge or other encumbrance of the Fund’s assets, and (b) assets held in escrow or in a separate account in connection with the Fund’s permitted investment practices will not be considered to be borrowings or deemed to be a pledge or other encumbrance of the Fund’s assets.

4. Engage in the business of underwriting the securities of other issuers (except as the Fund may be deemed an underwriter under the 1933 Act in connection with the purchase and sale of portfolio securities in accordance with its investment objective and policies); provided, however, that the Fund may invest all or part of its investable assets in an open-end investment company with substantially the same investment objective, policies and restrictions as the Fund.

5. Except during temporary defensive periods, purchase the securities of any issuer if, as a result of such purchase, less than 25% of the assets of (a) the Sustainable Global Assets Fund would be invested in the securities of Sustainable Issuers and (b) the Sustainable Themes Fund would be invested in the securities of securities issued by U.S. and non-U.S. companies from sectors that benefit from current environmental, social and economic trends.

For purposes of Investment Limitation No. 2, the Funds currently may engage in repurchase agreement transactions, in which a Fund purchases securities from a broker or bank with an agreement by the seller to repurchase the securities at an agreed upon price at an agreed

32

upon time. These transactions allow a Fund to invest its cash to generate income, usually on a short-term basis, while maintaining liquidity to honor its redemption obligations. Generating portfolio income through investment in repurchase agreements is not an integral part of the Funds’ investment programs. The Funds would engage in these transactions primarily to keep its cash fully invested, but available to meet redemption requests. In addition, the Funds currently may enter into securities lending transactions whereby a Fund would loan securities that it owns to institutions on a temporary basis. In these transactions, the Fund transfers its ownership interest in a security with the right to receive income from the borrower and the right to have the security returned to the Fund on short notice, for example, to enable the Fund to vote the securities. The value of the securities loaned by each of the Funds will not exceed one-third of the value of the Fund’s total assets. Securities lending allows a Fund to generate income on portfolio securities to enhance the Fund’s returns. The investment limitation would also permit the Fund make other types of loans to the extent permitted by the 1940 Act.

Except with respect to each Fund’s fundamental investment restriction regarding borrowings, any investment limitation of a Fund that is expressed as a percentage is determined at the time of investment by the Fund. An increase or decrease in a Fund’s net asset value or a company’s market capitalization subsequent to a Fund’s initial investment will not affect the Fund’s compliance with the percentage limitation or the company’s status as small, medium or large cap. From time to time, the Adviser may include as small, medium or large cap certain companies having market capitalizations outside the definitions described in the Prospectuses. Under the 1940 Act, each Fund will be required to maintain continuous asset coverage of at least 300% for borrowings from a bank. In the event that such asset coverage is below 300%, the applicable Fund will be required to reduce the amount of its borrowings to obtain 300% asset coverage, within three days (not including weekends and holidays) or such longer period as the rules and regulations of the SEC prescribe. In addition, under the 1940 Act, each Fund may not invest more than 5% of its assets in the securities of any issuer that derives more than 15% of its gross revenue from a securities-related business, unless an exemption is available under the 1940 Act or the rules thereunder.

DISCLOSURE OF PORTFOLIO HOLDINGS

The Company has adopted, on behalf of the Funds, a policy relating to the disclosure of each Fund’s portfolio securities to ensure that disclosure of information about portfolio holdings is in the best interest of Fund shareholders. The policies relating to the disclosure of the Funds’ portfolio securities are designed to allow disclosure of portfolio holdings information where necessary to the Fund’s operation without compromising the integrity or performance of the Fund. It is the policy of the Company that disclosure of a Fund’s portfolio holdings to a select person or persons prior to the release of such holdings to the public (“selective disclosure”) is prohibited, unless there are legitimate business purposes for selective disclosure.

The Company discloses portfolio holdings information as required in regulatory filings and shareholder reports, discloses portfolio holdings information as required by federal and state securities laws and may disclose portfolio holdings information in response to requests by governmental authorities. As required by the federal securities laws, including the 1940 Act, the Company will disclose the Funds’ portfolio holdings in applicable regulatory filings, including shareholder reports, reports on Form N-CSR and Form N-Q or such other filings, reports or disclosure documents as the applicable regulatory authorities may require.

33

The Adviser currently makes the Funds’ complete portfolio holdings, top ten holdings, sector weightings and other portfolio characteristics publicly available on its web site, www.robecoinvest.com as disclosed in the following table:

The scope of the information relating to the Funds’ portfolios that is made available on the web site may change from time to time without notice. The Adviser or its affiliates may include each Fund’s portfolio information that has already been made public through a Web posting or SEC filing in marketing literature and other communications to shareholders, advisors or other parties, provided that, in the case of information made public through the Web, the information is disclosed no earlier than the day after the date of posting to the Web site.

The Company may distribute or authorize the distribution of information about the Funds’ portfolio holdings that is not publicly available to its third-party service providers of the Company, which include PFPC Trust Company, the custodian; PNC Global Investment Servicing (U.S.) Inc. (“PNC”) (formerly known as PFPC Inc.), the administrator, accounting agent and transfer agent; the Funds’ independent registered public accounting firm; Drinker Biddle & Reath LLP, legal counsel; GCom²Solutions, R.R. Donnelly and Command, the financial printers; and Institutional Shareholder Services, the Funds’ proxy voting service. These service providers are required to keep such information confidential, and are prohibited from trading based on the information or otherwise using the information except as necessary in providing services to the Funds. Such holdings are released on conditions of confidentiality, which include appropriate trading prohibitions. “Conditions of confidentiality” include confidentiality terms included in written agreements, implied by the nature of the relationship (e.g. attorney-client relationship), or required by fiduciary or regulatory principles (e.g., custody services provided by financial institutions). Portfolio holdings may also be provided earlier to shareholders and their agents who receive redemptions in kind that reflect a pro rata allocation of all securities held in a Fund’s portfolio.

Portfolio holdings may also be disclosed, upon authorization by a designated officer of the Adviser, to certain independent reporting agencies recognized by the SEC as acceptable agencies for the reporting of industry statistical information. Disclosures to financial consultants are also subject to a confidentiality agreement and/or trading restrictions as well as a 60-day time lag. The foregoing disclosures are made pursuant to the Company’s policy on selective disclosure of portfolio holdings. The Board of Directors of the Company or a committee thereof may, in limited circumstances, permit other selective disclosure of portfolio holdings subject to a confidentiality agreement and/or trading restrictions. Portfolio holdings may also be provided earlier to shareholders and their agents who receive redemptions in kind that reflect a pro rata allocation of all securities held in the Funds’ portfolios.

34

The Adviser reserves the right to refuse to fulfill any request for portfolio holdings information from a shareholder or non-shareholder if it believes that providing such information will be contrary to the best interests of the Funds.

Any violations of the policy set forth above as well as any corrective action undertaken to address such violations must be reported by the Adviser, director, officer or third party service provider to the Company’s Chief Compliance Officer, who will determine whether the violation should be reported immediately to the Board of Directors of the Company or at its next quarterly Board meeting.

MANAGEMENT OF THE COMPANY

The business and affairs of the Company are managed under the direction of the Company’s Board of Directors. The Company is organized under and managed pursuant to Maryland law. The Directors and executive officers of the Company, their dates of birth, business addresses and principal occupations during the past five years are set forth below.

35

36

37

The Board and Standing Committees

Board. The Board of Directors is comprised of nine individuals, three of whom are considered “Interested” Directors as defined by the 1940 Act. The remaining Directors are referred to as “Disinterested” or “Independent” Directors. The Board meets at least quarterly to review the investment performance of each portfolio in the mutual fund family and other operational matters, including policies and procedures with respect to compliance with regulatory and other requirements. Currently, the Board of Directors has an Audit Committee, an Executive Committee, a Nominating and Governance Committee and a Regulatory Oversight Committee. The responsibilities of each committee and its members are described below.

Audit Committee. The Board has an Audit Committee comprised of one Interested Director and three Independent Directors. The current members of the Audit Committee are Messrs. Brodsky, Giordano, McKay and Sternberg. The Audit Committee, among other things, reviews results of the annual audit and approves the firm(s) to serve as independent auditors. The Audit Committee convened five times during the fiscal year ended August 31, 2008.

Executive Committee. The Board has an Executive Committee comprised of four Independent Directors. The current members of the Executive Committee are Messrs. Giordano, Reichman, Sargent and Sternberg. The Executive Committee may generally carry on and manage the business of the Company when the Board of Directors is not in session. The Executive Committee did not convene during the fiscal year ended August 31, 2008.

Nominating and Governance Committee. The Board has a Nominating and Governance Committee comprised only of Independent Directors. The current members of the Nominating and Governance Committee are Messrs. Giordano, McKay and Sargent. The Nominating and Governance Committee recommends to the Board of Directors all persons to be nominated as Directors of the Company. The Nominating and Governance Committee will consider nominees recommended by shareholders. Recommendations should be submitted to the Committee care of the Company’s Secretary. The Nominating and Governance Committee convened twice during the fiscal year ended August 31, 2008.

Regulatory Oversight Committee. The Board has a Regulatory Oversight Committee compromised of two Interested Directors and three Independent Directors. The current members of the Regulatory Oversight Committee are Messrs. Carnall, Reichman, Sargent, Sablowsky and Straniere. The Regulatory Oversight Committee monitors regulatory developments in the mutual fund industry and focuses on various regulatory aspects of the operation of the Company. The Regulatory Oversight Committee convened six times during the fiscal year ended August 31, 2008.

38

Director Ownership of Shares of the Company

The following table sets forth the dollar range of equity securities beneficially owned by each Director in the Funds and in all of the portfolios (which for each Director comprise all registered investment companies within the Company’s family of investment companies overseen by him), as of December 31, 2007.

Directors’ and Officers’ Compensation

Effective October 1, 2008 the Company pays each Director at the rate of $17,500 annually, $3,500 for each regular meeting of the Board of Directors, $1,500 for each special meeting of the Board of Directors and Committee meeting attended in person and $1,000 for each special meeting of the Board of Directors and Committee meeting attended telephonically. From March 1, 2008 to October 1, 2008 the Company paid each Director at the rate of $17,500 annually, $3,500 for each regular meeting of the Board of Directors and $500 for each special meeting of the Board of Directors and Committee meeting lasting up to one hour or $1,500 for each special meeting of the Board of Directors and Committee meeting lasting over one hour attended by a Director or in which he participated, whether or not it was held in conjunction with a Board meeting. From May 23, 2007 to March 1, 2008 the Company paid each Director at the rate of $17,500 annually, $3,500 per meeting of the Board of Directors and $500 for each committee meeting lasting up to one hour or $1,500 for each committee meeting lasting over one hour attended by a Director or in which he participates, whether or not it is held in conjunction with a Board meeting. Prior to November 15, 2007, no Director was paid for a committee

39

meeting if it was held in conjunction with a Board meeting. The Chairman of the Board receives an additional fee of $12,000 per year for his services in this capacity, and the Chairman of the Audit Committee, Nominating Committee and Regulatory Oversight Committee receives an additional fee of $4,000 per year for his services. From February 15, 2006 to May 23, 2007, the Company paid each Director at the rate of $17,500 annually and $3,500 per meeting of the Board of Directors or any committee thereof that was not held in conjunction with a Board meeting. Each Director received a fee of $500 for telephonic Board or Committee meetings lasting one-half hour or less. The Chairman of the Board received an additional fee of $12,000 per year for his services in this capacity, and the Chairman of the Audit Committee received an additional fee of $4,000 per year for his services.

Directors are reimbursed for any reasonable out-of-pocket expenses incurred in attending meetings of the Board of Directors or any committee thereof. The Company also compensates its President, Treasurer and Chief Compliance Officer for their respective services to the Company. For the fiscal year ended August 31, 2008, each of the following members of the Board of Directors and the President, Treasurer and Chief Compliance Officer received compensation from the Company in the following amounts: