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The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell nor do they seek an offer to buy these securities in any jurisdiction where the offer or sale is not permitted.

Filed Pursuant to Rule 424(b)(5)
Registration No. 333-240295

Subject to Completion
Preliminary Prospectus Supplement, dated August 3, 2020

PRELIMINARY PROSPECTUS SUPPLEMENT
(TO PROSPECTUS DATED AUGUST 3, 2020)

2,150,000 Shares

SiteOne Landscape Supply, Inc.

Common Stock

We are offering 2,150,000 shares of common stock of SiteOne Landscape Supply, Inc.

Our common stock is listed on the New York Stock Exchange (the “NYSE”) under the symbol SITE. The last reported sale price of our common stock on July 31, 2020 was $128.03 per share.

We have granted an option to the underwriter, exercisable for 30 days after the date of this prospectus supplement, to purchase up to 322,500 additional shares of our common stock at a price of $ per share. See “Underwriting.”

Investing in our common stock involves risks. See the section entitled “Risk Factors” on page S-4 of this prospectus supplement and on page 4 of the accompanying prospectus.

The underwriter has agreed to purchase the shares of common stock from us at a price of $ per share, which will result in aggregate proceeds of $ to us, before expenses. The underwriter may offer the shares of common stock from time to time for sale in one or more transactions on the NYSE, in the over-the-counter market, through negotiated transactions or otherwise at market prices prevailing at the time of sale or at negotiated prices. We have agreed to reimburse the underwriter for certain expenses in connection with this offering. See “Underwriting.”

Neither the U.S. Securities and Exchange Commission (the “SEC”) nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus supplement or the accompanying prospectus. Any representation to the contrary is a criminal offense.

The underwriter expects to deliver the shares to purchasers on or about , 2020.

BofA Securities

The date of this prospectus supplement is , 2020.

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PROSPECTUS SUPPLEMENT

	Page
ABOUT THIS PROSPECTUS SUPPLEMENT		S-1
PROSPECTUS SUPPLEMENT SUMMARY		S-2
OUR COMPANY		S-2
THE OFFERING		S-3
RISK FACTORS		S-4
FORWARD-LOOKING STATEMENTS		S-9
USE OF PROCEEDS		S-11
MATERIAL U.S. FEDERAL TAX CONSIDERATIONS FOR NON-U.S. HOLDERS		S-12
CERTAIN ERISA CONSIDERATIONS		S-16
UNDERWRITING		S-18
VALIDITY OF COMMON STOCK		S-24
EXPERTS		S-24
WHERE YOU CAN FIND MORE INFORMATION		S-24
INCORPORATION OF CERTAIN INFORMATION BY REFERENCE		S-25

PROSPECTUS

	ABOUT THIS PROSPECTUS					2
	OUR COMPANY					3
	RISK FACTORS					4
	FORWARD-LOOKING STATEMENTS					5
	USE OF PROCEEDS					7
	DESCRIPTION OF CAPITAL STOCK					8
	PLAN OF DISTRIBUTION					12
	VALIDITY OF COMMON STOCK					14
	EXPERTS					14
	WHERE YOU CAN FIND MORE INFORMATION					14
	INCORPORATION OF CERTAIN INFORMATION BY REFERENCE					15

Neither we nor the underwriter has authorized anyone to provide you with different information or to make any representations other than those contained or incorporated by reference into this prospectus supplement, the accompanying prospectus or in any free writing prospectus we have prepared. If anyone provides you with different or inconsistent information, you should not rely on it. This prospectus supplement and the accompanying prospectus do not constitute an offer to sell, or a solicitation of an offer to purchase, the securities offered by this prospectus supplement and the accompanying prospectus in any jurisdiction in which it is unlawful to make such offer or solicitation.

You should not assume that the information contained in this prospectus supplement, the accompanying prospectus and the documents incorporated by reference herein and therein is accurate as of any date other than the date on the front cover of those documents. Our business, financial condition, results of operations and prospects may have changed since that date.

For investors outside the United States: Neither we nor the underwriter has done anything that would permit this offering or possession or distribution of this prospectus supplement and the accompanying prospectus in any jurisdiction where action for that purpose is required, other than in the United States. You are required to inform yourselves about and to observe any restrictions relating to this offering and the distribution of this prospectus supplement and the accompanying prospectus outside of the United States.

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ABOUT THIS PROSPECTUS SUPPLEMENT

Unless the context otherwise indicates or requires, as used in this prospectus supplement, the terms “Company,” “SiteOne,” “we,” “us” and “our” mean SiteOne Landscape Supply, Inc. and its consolidated subsidiaries. The term “Holdings” refers to SiteOne Landscape Supply, Inc. individually without its subsidiaries.

This document has two parts, a prospectus supplement and an accompanying prospectus dated August 3, 2020. This prospectus supplement and the accompanying prospectus are part of a registration statement on Form S-3 that we filed with the SEC utilizing a “shelf” registration process. Under this shelf registration process, we may, from time to time, offer and sell our common stock in one or more offerings or resales.

The accompanying prospectus provides you with a general description of our common stock, which we may offer pursuant to this prospectus supplement. This prospectus supplement, which describes certain matters relating to us and the specific terms of this offering of shares of our common stock, adds to and updates information contained in the accompanying prospectus and the documents incorporated by reference therein and herein. Any statement that we make in the accompanying prospectus will be deemed modified or superseded by any inconsistent statement made by us in this prospectus supplement.

The rules of the SEC allow us to incorporate by reference information into this prospectus supplement. This information incorporated by reference is considered to be a part of this prospectus supplement, and information that we file later with the SEC, to the extent incorporated by reference, will automatically update and supersede this information. See “Incorporation of Certain Information by Reference.” You should read both this prospectus supplement and the accompanying prospectus together with the additional information incorporated by reference herein and therein, including all documents described under the headings “Incorporation of Certain Information by Reference” and “Where You Can Find More Information” in this prospectus supplement before investing in our common stock.

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PROSPECTUS SUPPLEMENT SUMMARY

The following summary does not contain all the information that may be important to purchasers of our common stock. You should carefully read the entire prospectus supplement, the accompanying prospectus and the financial statements, notes to financial statements and other information incorporated by reference in this prospectus supplement before making any investment decision.

OUR COMPANY

We are the largest and only national wholesale distributor of landscape supplies in the United States and have a growing presence in Canada. Our customers are primarily residential and commercial landscape professionals who specialize in the design, installation and maintenance of lawns, gardens, golf courses, and other outdoor spaces. Through our expansive North American network of over 550 branch locations in 45 U.S. states and six Canadian provinces, we offer a comprehensive selection of more than 120,000 SKUs, including irrigation supplies, fertilizer and control products (e.g., herbicides), landscape accessories, nursery goods, hardscapes (including pavers, natural stone, and blocks), outdoor lighting, and ice melt products to green industry professionals. We also provide value-added consultative services to complement our product offerings and to help our customers operate and grow their businesses.

Our principal executive offices are located at 300 Colonial Center Parkway, Suite 600, Roswell, Georgia 30076, and our telephone number at that address is (470) 277-7000.

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THE OFFERING

The following discussion of the offering contains basic information about the offering and the common stock and is not intended to be complete. It does not contain all the information that may be important to you. For a more complete understanding of the common stock, please refer to the section of the accompanying prospectus entitled “Description of Capital Stock.”

Common stock to be offered by us

2,150,000 shares (or 2,472,500 shares if the underwriter exercises its option to purchase additional shares in full)

Common stock outstanding after this
offering

44,156,219 shares (or 44,478,719 shares if the underwriter exercises its option to purchase additional shares in full)

Option to purchase additional shares

Use of proceeds

The aggregate proceeds to us from the sale of shares of common stock in this offering will be approximately $ million, before offering expenses. We intend to use the net proceeds from this offering for general corporate purposes, which may include the acquisition of companies or businesses, the repayment and refinancing of debt, working capital and capital expenditures. See “Use of Proceeds.”

Risk factors

You should carefully read and consider the information set forth under “Risk Factors” beginning on page S- 4 in this prospectus supplement and in the documents incorporated by reference herein, including our Annual Report on Form 10-K for the year ended December 29, 2019 and our subsequently filed Quarterly Reports on Form 10-Q, before investing in our common stock.

Dividend policy

We do not currently expect to declare or pay dividends on our common stock for the foreseeable future. Payments of dividends, if any, will be at the sole discretion of our board of directors after taking into account various factors, including general and economic conditions, our financial condition and operating results, our available cash and current and anticipated cash needs, capital requirements, contractual, legal, tax and regulatory restrictions and implications of the payment of dividends by us to our stockholders or by our subsidiaries to us, and such other factors as our board of directors may deem relevant. In addition, Delaware law may impose requirements that may restrict our ability to pay dividends to holders of our common stock. To the extent that we determine in the future to pay dividends on our common stock, none of our subsidiaries will be obligated to make funds available to us for the payment of dividends.

NYSE symbol

“SITE.”

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RISK FACTORS

Investing in our common stock involves a high degree of risk. Our reputation, business, financial position, results of operations and cash flows are subject to various risks. You should consider and read carefully all of the risks and uncertainties described in this section entitled “Risk Factors,” as well as other risks, uncertainties and information included or incorporated by reference in this prospectus supplement and the accompanying prospectus, including our financial statements and related notes included in our Annual Report on Form 10-K for the year ended December 29, 2019, filed with the SEC on February 26, 2020, our Quarterly Reports on Form 10-Q for the quarterly periods ended March 29, 2020 and June 28, 2020 filed with the SEC on April 29, 2020 and July 29, 2020, respectively, which are incorporated by reference in this prospectus supplement, before making an investment decision. The occurrence of any of the risks described in this prospectus supplement and the documents incorporated by reference in this prospectus supplement or additional risks and uncertainties not presently known to us could materially and adversely affect our reputation, business, financial position, results of operations or cash flows. In such case, the trading price of our common stock could decline, and you may lose all or part of your investment. This prospectus supplement, the accompanying prospectus and the documents incorporated by reference herein and therein also contain forward-looking statements and estimates that involve risks and uncertainties. Our actual results could differ materially from those anticipated in the forward-looking statements as a result of specific factors, including the risks and uncertainties described in the accompanying prospectus and the documents incorporated by reference in this prospectus supplement.

Risks Related to Our Business and Our Industry

The ongoing COVID-19 pandemic has had, and may continue to have, negative impacts on our business and the business of our customers and suppliers.

The ongoing COVID-19 pandemic has significantly impacted worldwide economic conditions and could have a material adverse effect on our operations and business and those of our customers and suppliers. The ongoing COVID-19 pandemic began to impact our operations late in the first quarter of 2020 and is likely to continue to affect our business, including as government authorities have, and may continue to impose mandatory business closures, “stay-at-home” or “shelter-in-place” orders, and social distancing protocols, and seek voluntary facility closures or impose other restrictions. These actions could materially adversely affect our ability to adequately staff, manage, and maintain our operations, impair our ability to sustain sufficient financial liquidity, and impact our financial results. The effects of the COVID-19 pandemic may also include the disruption or closure of our customers’ and/or suppliers’ facilities and supply chains, which could materially and adversely impact demand for our products, our ability to obtain or deliver inventory and our ability to collect accounts receivable as customers and suppliers face higher liquidity and solvency risks. While our branches and other facilities have been able to continue to operate under applicable federal, state, and local orders, government mandates in certain jurisdictions have prohibited or limited our customers’ operations, negatively impacting sales at the end of the first quarter and the early part of the second quarter of fiscal 2020 and may negatively impact sales in future periods until the COVID-19 pandemic moderates. As we cannot predict the duration or scope of the COVID-19 pandemic, the anticipated negative financial impact to our operating results cannot be reasonably estimated but could be material and last for an extended period of time.

Our business has been negatively impacted, and could also be negatively impacted over the medium-to-longer term if the disruptions related to COVID-19, among other things: limit the ability of our suppliers to manufacture, or procure from manufacturers, the products we sell, or to meet delivery requirements and commitments; limit the ability of our employees to perform their work due to impacts caused by the pandemic or local, state, or federal orders that restrict our operations or the operations of our customers; limit the ability of carriers to deliver our products to our branches and customers; limit the ability of our customers to conduct their business and purchase our products and services; decrease demand for our customers’ services; limit the ability of our customers to pay us on a timely basis; precipitate a prolonged economic downturn and/or an extended rise in unemployment or tempering of wage growth, any of which could lower demand for our products; impair our ability to operate in a typical manner or at all, generate revenues and cash flows, and/or access the capital or lending markets (or significantly increase the costs of doing so), as may be necessary to sustain our business.

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The inherent uncertainty surrounding COVID-19, due in part to rapidly changing governmental directives, public health challenges and progress, and market reactions thereto, also makes it more challenging for our management to estimate the potential impact and the future performance of our business. Accordingly, the anticipated negative financial impact to our operating results cannot be reasonably estimated at this time, but could be material and last for an extended period of time.

In the event of a cybersecurity incident, we could experience operational interruptions, incur substantial additional costs, become subject to legal or regulatory proceedings or suffer damage to our reputation.

In addition to the disruptions that may occur from interruptions in our information technology systems, cybersecurity threats and sophisticated and targeted cyberattacks pose a risk to our information technology systems. We have established security policies, processes, and defenses designed to help identify and protect against intentional and unintentional misappropriation or corruption of our information technology systems and information and disruption of our operations. Despite these efforts, our information technology systems may be damaged, disrupted, or shut down due to attacks by unauthorized access, malicious software, computer viruses, undetected intrusion, hardware failures, or other events, and in these circumstances our disaster recovery plans may be ineffective or inadequate. These breaches or intrusions could lead to business interruption, exposure of proprietary or confidential information, data corruption, damage to our reputation, exposure to legal and regulatory proceedings, and other costs. A security breach might also lead to violations of privacy laws, regulations, trade guidelines or practices related to our customers and associates and could result in potential claims from customers, associates, shareholders, or regulatory agencies. Such events could adversely impact our reputation, business, financial position, results of operations, and cash flows. In addition, we could be adversely affected if any of our significant customers or suppliers experiences any similar events that disrupt their business operations or damage their reputation.

While we maintain monitoring practices and protections of our information technology to reduce these risks and test our systems on an ongoing basis for potential threats, there can be no assurance that these efforts will prevent a cyber-attack or other security breach. We have not always been able in the past and may be unable in the future to anticipate or prevent techniques used to obtain unauthorized access or to compromise our systems because the techniques used change frequently and are generally not detected until after an incident has occurred.

In July 2020, we experienced a ransomware attack on our information technology systems. Our investigation of the ransomware attack is ongoing, and there can be no guarantees that the attack will not lead to the disclosure of customer data, our trade secrets or other intellectual property, or personal information of our employees. There can be no guarantee that the release of any of this information will not have a material adverse effect on our business, reputation, financial condition, and results of operations. In addition, the July 2020 ransomware attack could result in potential claims from customers, associates, shareholders, or regulatory agencies, which could result in significant judgements against us, penalties, and fines. The cost of investigating, mitigating, and responding to potential data security breaches and complying with applicable breach notification obligations to individuals, regulators, partners, and others, including the July 2020 ransomware attack, could be significant.

We carry cybersecurity insurance to help mitigate the financial exposure and related notification procedures in the event of intentional intrusion, including the July 2020 ransomware attack; however, there can be no assurance that our insurance will adequately protect against potential losses that could adversely affect our business.

Risks Related to Our Common Stock

Holdings is a holding company with no operations of its own, and it depends on its subsidiaries for cash to fund all of its operations and expenses, including to make future dividend payments, if any.

Our operations are conducted entirely through our subsidiaries, and our ability to generate cash to fund operations and expenses, to pay dividends or to meet debt service obligations is highly dependent on the earnings and the receipt of funds from our subsidiaries through dividends or intercompany loans. Deterioration in the financial condition, earnings or cash flow of SiteOne Landscape Supply, LLC (“Landscape”) and its subsidiaries for any reason could limit or impair their ability to pay such distributions.

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Additionally, to the extent that Holdings needs funds, and its subsidiaries are restricted from making such distributions under applicable law or regulation or under the terms of our financing arrangements, or are otherwise unable to provide such funds, it could materially adversely affect our business, financial condition, results of operations, and cash flows.

Further, the terms of the agreements governing the asset-based loan facility in the amount of up to $375.0 million, subject to availability under a borrowing base, with UBS AG, Stamford Branch, as administrative agent and collateral agent, and the other financial institutions and lenders from time to time party thereto (the “ABL Facility”) and the senior secured term loan facility with UBS AG, Stamford Branch, as administrative agent and collateral agent, and the other financial institutions and lenders from time to time party thereto (which was amended on November 23, 2016, May 24, 2017, December 12, 2017 and August 14, 2018 and as may be further amended, supplemented, waived or otherwise modified from time to time, the “Term Loan Facility” and, together with the ABL Facility, the “Credit Facilities”) restrict the ability of our subsidiaries to pay dividends, make loans or otherwise transfer assets to Holdings. Furthermore, our subsidiaries are permitted under the terms of the Credit Facilities and other indebtedness to incur additional indebtedness that may restrict or prohibit the making of distributions, the payment of dividends or the making of loans by such subsidiaries to us. In addition, Delaware law may impose requirements that may restrict our ability to pay dividends to holders of our common stock.

We do not currently expect to declare or pay dividends on our common stock for the foreseeable future. Payments of dividends, if any, will be at the sole discretion of our board of directors after taking into account various factors, including general and economic conditions, our financial condition and operating results, our available cash and current and anticipated cash needs, capital requirements, contractual, legal, tax and regulatory restrictions and implications of the payment of dividends by us to our stockholders or by our subsidiaries (including Landscape) to us, and such other factors as our board of directors may deem relevant. In addition, Delaware law may impose requirements that may restrict our ability to pay dividends to holders of our common stock. To the extent that we determine in the future to pay dividends on our common stock, none of our subsidiaries will be obligated to make funds available to us for the payment of dividends.

The market price of our common stock may be volatile.

The stock market in general and our common stock in particular have recently experienced significant volatility and the market price of our common stock may continue to fluctuate significantly. Among the factors that could affect our stock price are:

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industry or general market conditions;

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domestic and international economic and political factors unrelated to our performance;

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changes in our customers’ or their end-users’ preferences;

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new regulatory pronouncements and changes in regulatory guidelines;

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lawsuits, enforcement actions and other claims by third parties or governmental authorities;

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actual or anticipated fluctuations in our quarterly operating results;

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changes in securities analysts’ estimates of our financial performance;

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action by institutional stockholders or other large stockholders, including future sales;

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failure to meet any guidance given by us or any change in any guidance given by us, or changes by us in our guidance practices;

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announcements by us of significant impairment charges;

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speculation in the press or investment community;

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investor perception of us and our industry;

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changes in market valuations or earnings of similar companies;

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announcements by us or our competitors of significant contracts, acquisitions, dispositions or strategic partnerships;

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war, terrorist acts and epidemic disease;

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any future sales of our common stock or other securities; and

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additions or departures of key personnel.

In particular, we cannot assure that you will be able to resell your shares at or above your purchase price. The stock markets have experienced extreme volatility in recent years that has been unrelated to the operating performance of particular companies. These broad market fluctuations may adversely affect the trading price of our common stock. In the past, following periods of volatility in the market price of a company’s securities, class action litigation has often been instituted against the affected company. Any litigation of this type brought against us could result in substantial costs and a diversion of our management’s attention and resources, which would harm our business, results of operations, financial condition, and cash flows.

Future sales of shares by us could cause our stock price to decline.

Sales of substantial amounts of our common stock in the public market, or the perception that these sales could occur, could cause the market price of our common stock to decline. These sales, or the possibility that these sales may occur, also might make it more difficult for us to sell equity securities in the future at a time and at a price that we deem appropriate.

In the future, we may issue additional shares of common stock or other equity or debt securities convertible into common stock in connection with a financing, acquisition, litigation settlement or associate arrangement or otherwise. Any of these issuances could result in dilution to our existing stockholders and could cause the trading price of our common stock to decline.

Future offerings of debt or equity securities may adversely affect the market price of our common stock.

If, in the future, we decide to issue debt or equity securities that rank senior to our common stock, it is likely that such securities will be governed by an indenture or other instrument containing covenants restricting our operating flexibility. Additionally, any convertible or exchangeable securities that we issue in the future may have rights, preferences and privileges more favorable than those of our common stock and may result in dilution to owners of our common stock. We and, indirectly, our stockholders will bear the cost of issuing and servicing such securities. Because our decision to issue debt or equity securities in any future offering will depend on market conditions and other factors beyond our control, we cannot predict or estimate the amount, timing or nature of our future offerings. Thus, holders of our common stock will bear the risk of our future offerings reducing the market price of our common stock and diluting the value of their stock holdings in us.

Anti-takeover provisions in our third amended and restated certificate of incorporation and third amended and restated by-laws could discourage, delay or prevent a change of control of our company and may affect the trading price of our common stock.

Our third amended and restated certificate of incorporation (our “amended and restated certificate of incorporation”) and third amended and restated by-laws (our “amended and restated by-laws”) include a number of provisions that may discourage, delay or prevent a change in our management or control over us that stockholders may consider favorable. For example, our amended and restated certificate of incorporation and amended and restated by-laws collectively:

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authorize the issuance of “blank check” preferred stock that could be issued by our board of directors to thwart a takeover attempt;

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provide for a classified board of directors, which divides our board of directors into three classes, with members of each class serving staggered three-year terms, which prevents stockholders from electing an entirely new board of directors at an annual meeting;

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limit the ability of stockholders to remove directors;

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provide that vacancies on our board of directors, including vacancies resulting from an enlargement of our board of directors, may be filled only by a majority vote of directors then in office;

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prohibit stockholders from calling special meetings of stockholders;

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prohibit stockholder action by written consent, thereby requiring all actions to be taken at a meeting of the stockholders; and

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establish advance notice requirements for nominations of candidates for election as directors or to bring other business before an annual meeting of our stockholders.

These provisions may prevent our stockholders from receiving the benefit from any premium to the market price of our common stock offered by a bidder in a takeover context. Even in the absence of a takeover attempt, the existence of these provisions may adversely affect the prevailing market price of our common stock if the provisions are viewed as discouraging takeover attempts in the future.

Our amended and restated certificate of incorporation and amended and restated by-laws may also make it difficult for stockholders to replace or remove our management. Furthermore, the existence of the foregoing provisions could limit the price that investors might be willing to pay in the future for shares of our common stock. These provisions may facilitate management entrenchment that may delay, deter, render more difficult or prevent a change in our control, which may not be in the best interests of our stockholders.

We do not intend to pay dividends on our common stock and, consequently, your ability to achieve a return on your investment will depend on appreciation in the price of our common stock.

We do not intend to declare and pay dividends on our common stock for the foreseeable future. We currently intend to invest our future earnings, if any, to service our debt, to fund our growth, to develop our business, for working capital needs and for general corporate purposes. Therefore, you are not likely to receive any dividends on your common stock for the foreseeable future and the success of an investment in shares of our common stock will depend upon any future appreciation in their value. There is no guarantee that shares of our common stock will appreciate in value or even maintain the price at which our stockholders have purchased their shares.

In addition, Holdings’ operations are conducted entirely through our subsidiaries. As such, to the extent that we determine in the future to pay dividends on our common stock, none of our subsidiaries will be obligated to make funds available to Holdings for the payment of dividends. Further, the agreements governing the Credit Facilities significantly restrict the ability of our subsidiaries to pay dividends or otherwise transfer assets to us.

Our amended and restated certificate of incorporation designates the Court of Chancery of the State of Delaware as the exclusive forum for certain litigation that may be initiated by our stockholders, which could limit our stockholders’ ability to obtain a favorable judicial forum for disputes with us.

Our amended and restated certificate of incorporation provides that the Court of Chancery of the State of Delaware is, to the fullest extent permitted by law, the sole and exclusive forum for (i) any derivative action or proceeding brought on our behalf, (ii) any action asserting a claim of breach of a fiduciary duty owed to us or our stockholders by any of our directors, officers, other employees, agents or stockholders, (iii) any action asserting a claim arising out of or under the General Corporation Law of the State of Delaware (the “DGCL”), or as to which the DGCL confers jurisdiction on the Court of Chancery of the State of Delaware (including, without limitation, any action asserting a claim arising out of or pursuant to our amended and restated certificate of incorporation or our amended and restated by-laws) or (iv) any action asserting a claim that is governed by the internal affairs doctrine. By becoming a stockholder in our company, you will be deemed to have notice of and have consented to the provisions of our amended and restated certificate of incorporation related to choice of forum. The choice of forum provision in our amended and restated certificate of incorporation may limit our stockholders’ ability to obtain a favorable judicial forum for disputes with us or any of our directors, officers, other employees, agents or stockholders, which may discourage lawsuits with respect to such claims. Alternatively, if a court were to find the choice of forum provision contained in our amended and restated certificate of incorporation to be inapplicable or unenforceable in an action, we may incur additional costs associated with resolving such action in other jurisdictions, which could harm our business, results of operations, and financial condition.

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FORWARD-LOOKING STATEMENTS

This prospectus supplement, the accompanying prospectus and the documents incorporated or deemed to be incorporated by reference herein or therein contain forward-looking statements and cautionary statements within the meaning of the Private Securities Litigation Reform Act of 1995. Some of the forward-looking statements can be identified by the use of terms such as “may,” “intend,” “might,” “will,” “should,” “could,” “would,” “expect,” “believe,” “estimate,” “anticipate,” “predict,” “project,” “potential,” or the negative of these terms, and similar expressions. You should be aware that these forward-looking statements are subject to risks and uncertainties that are beyond our control. Further, any forward-looking statement speaks only as of the date on which it is made, and weundertake no obligation to update any forward-looking statement to reflect events or circumstances after the date on which it is made or to reflect the occurrence of anticipated or unanticipated events or circumstances. New factors that could cause our business not to develop as we expect may emerge from time to time, and it is not possible for us to predict all of them. Factors that may cause actual results to differ materially from those expressed or implied by the forward-looking statements include, but are not limited to, the following:

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the potential negative impact of the ongoing COVID-19 pandemic (which, among other things, may exacerbate each of the risks listed below);

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economic downturn or recession;

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cyclicality in residential and commercial construction markets;

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general economic and financial conditions;

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weather conditions, seasonality and availability of water to end-users;

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public perceptions that our products and services are not environmentally friendly;

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competitive industry pressures;

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cybersecurity incidents including the July 2020 ransomware attack;

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product shortages and the loss of key suppliers;

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product price fluctuations;

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ability to pass along product cost increases;

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inventory management risks;

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ability to implement our business strategies and achieve our growth objectives;

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acquisition and integration risks;

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increased operating costs;

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risks associated with our large labor force (including work stoppages due to COVID-19);

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retention of key personnel;

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construction defect and product liability claims;

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impairment of goodwill;

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adverse credit and financial markets events and conditions (which have worsened and may continue to worsen as a result of the ongoing COVID-19 pandemic);

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credit sale risks;

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performance of individual branches;

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environmental, health and safety laws and regulations;

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hazardous materials and related materials;

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laws and government regulations applicable to our business that could negatively impact demand for our products;

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computer data processing systems;

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security of personal information about our customers;

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intellectual property and other proprietary rights;

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the possibility of securities litigation;

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unanticipated changes in our tax provisions;

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our substantial indebtedness and our ability to obtain financing in the future;

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increases in interest rates;

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risks related to our common stock;

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terrorism or the threat of terrorism; and

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risks related to other factors discussed in this prospectus supplement, the accompanying prospectus and the documents incorporated or deemed to be incorporated by reference herein and therein.

You should read this prospectus supplement, the accompanying prospectus and the documents incorporated or deemed to be incorporated by reference herein and therein completely and with the understanding that actual future results may be materially different from expectations. All forward-looking statements made in this prospectus supplement, the accompanying prospectus and the documents incorporated or deemed to be incorporated by reference herein and therein are qualified by these cautionary statements. These forward-looking statements are made only as of the date presented, and we do not undertake any obligation, other than as may be required by law, to update or revise any forward-looking or cautionary statements to reflect changes in assumptions, the occurrence of events, unanticipated or otherwise, and changes in future operating results over time or otherwise.

Comparisons of results between current and prior periods are not intended to express any future trends, or indications of future performance, unless expressed as such, and should only be viewed as historical data.

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MATERIAL U.S. FEDERAL TAX CONSIDERATIONS FOR NON-U.S. HOLDERS

The following is a discussion of material U.S. federal income and estate tax considerations relating to the purchase, ownership and disposition of our common stock by Non-U.S. Holders (as defined below) that purchase our common stock pursuant to this offering and hold such common stock as a capital asset. This discussion is based on the Internal Revenue Code of 1986, as amended (the “Code”), U.S. Treasury regulations promulgated or proposed thereunder, and administrative and judicial interpretations thereof, all as in effect on the date hereof and all of which are subject to change, possibly with retroactive effect, or to different interpretation. This discussion does not address all of the U.S. federal income and estate tax considerations that may be relevant to specific Non-U.S. Holders in light of their particular circumstances or to Non-U.S. Holders subject to special treatment under U.S. federal income taxlaw (such as banks, insurance companies, dealers in securities or other Non-U.S. Holders that generally mark their securities to market for U.S. federal income tax purposes, foreign governments, international organizations, tax-exempt entities, certain former citizens or residents of the United States, or Non-U.S. Holders that hold our common stock as part of a straddle, hedge, conversion or other integrated transaction). This discussion does not address any U.S. state or local or non-U.S. tax considerations or any U.S. federal gift or alternative minimum tax considerations.

As used in this discussion, the term “Non-U.S. Holder” means a beneficial owner of our common stock that, for U.S. federal income tax purposes, is:

•

an individual who is neither a citizen nor a resident of the United States;

•

a corporation (or other entity treated as a corporation) that is not created or organized in or under the laws of the United States, any state thereof, or the District of Columbia;

•

an estate that is not subject to U.S. federal income tax on income from non-U.S. sources which is not effectively connected with the conduct of a trade or business in the United States; or

•

a trust unless (i) a court within the United States is able to exercise primary supervision over its administration and one or more U.S. persons have the authority to control all of its substantial decisions or (ii) it has in effect a valid election under applicable U.S. Treasury regulations to be treated as a U.S. person.

If an entity treated as a partnership for U.S. federal income tax purposes invests in our common stock, the U.S. federal income taxconsiderations relating to such investment will depend in part upon the status and activities of such entity and the particular partner. Any such entity should consult its own tax advisor regarding the U.S. federal income tax considerations applicable to it and its partners relating to the purchase, ownership and disposition of our common stock.

PERSONS CONSIDERING AN INVESTMENT IN OUR COMMON STOCK SHOULD CONSULT THEIR OWN TAX ADVISORS REGARDING THE U.S. FEDERAL, STATE AND LOCAL AND NON-U.S. INCOME, ESTATE AND OTHER TAX CONSIDERATIONS RELATING TO THE PURCHASE, OWNERSHIP AND DISPOSITION OF OUR COMMON STOCK IN LIGHT OF THEIR PARTICULAR CIRCUMSTANCES.

Distributions on Common Stock

We do not currently expect to declare or pay any cash dividends on our stock for the foreseeable future. If we make a distribution of cash or other property (other than certain pro rata distributions of ourcommon stock or rights to acquire our common stock) in respect of a share of our common stock, the distribution generally will be treated as a dividend to the extent it is paid from our current or accumulated earnings and profits (as determined under U.S. federal income tax principles). If the amount of such distribution exceeds our current and accumulated earnings and profits, such excess generally will be treated first as a tax-free return of capital to the extent of the Non-U.S. Holder’s adjusted tax basis in such share of our common stock, and then as capital gain (which will be treated in the manner described below under “— Sale, Exchange or Other Disposition of Common Stock”). Distributions treated as dividends on our common stock that are paid to or for the account of a Non-U.S. Holder generally will be subject to U.S. federal withholding tax at a rate of 30%, or at a lower rate if provided by an applicable tax treaty and the Non-U.S. Holderprovides the documentation (generally Internal Revenue Service (“IRS”) Form W-8BEN or IRS Form W-8BEN-E) required to claim benefits under such tax treaty to the applicable withholding agent. A Non-U.S. Holder that

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does not timely furnish the required documentation, but that qualifies for a reduced treaty rate, may obtain a refund of any excess amounts withheld by timely filing an appropriate claim for a refund with the IRS. Even if ourcurrent or accumulated earnings and profits are less than the amount of the distribution, the applicable withholding agent may elect to treat the entire distribution as a dividend for U.S. federal withholding tax purposes. Each Non-U.S. Holdershould consult its own tax advisor regarding U.S. federal withholding tax on distributions, including such Non-U.S. Holder’s eligibility for a lower rate and the availability of a refund of any excess U.S. federal tax withheld.

If, however, a dividend is effectively connected with the conduct of a trade or business in the United States by a Non-U.S. Holder, such dividend generally will not be subject to the 30% U.S. federal withholding tax if such Non-U.S. Holder provides the appropriate documentation (generally, IRS Form W-8ECI) to the applicable withholding agent. Instead, such Non-U.S. Holdergenerally will be subject to U.S. federal income tax on such dividend in substantially the same manner as a holder that is a U.S. person (except as provided by an applicable tax treaty). In addition, a Non-U.S. Holder that is treated as a corporation for U.S. federal income tax purposes may be subject to a branch profits tax at a rate of 30% (or a lower rate if provided by an applicable tax treaty) on its effectively connected income for the taxable year, subject to certain adjustments.

The foregoing discussion is subject to the discussion below under “— FATCA Withholding” and “— Information Reporting and Backup Withholding.”

Sale, Exchange or Other Disposition of Common Stock

ANon-U.S. Holder generally will not be subject to U.S. federal income tax on any gain recognized on the sale, exchange or other disposition of our common stock unless:

such gain is effectively connected with the conduct of a trade or business in the United States by such Non-U.S. Holder, in which event such Non-U.S. Holder generally will be subject to U.S. federal income tax on such gain in substantially the same manner as a holder that is a U.S. person (except as provided by an applicable tax treaty) and, if it is treated as a corporation for U.S. federal income tax purposes, may also be subject to a branch profits tax at a rate of 30% (or a lower rate if provided by an applicable tax treaty);

ii.

such Non-U.S. Holder is an individual who is present in the United States for 183 days or more during the taxable year of such sale, exchange or other disposition and certain other conditions are met, in which event such gain (net of certain U.S. source capital losses) generally will be subject to U.S. federal income tax at a rate of 30% (except as provided by an applicable tax treaty); or

iii.

we are or have been a “United States real property holding corporation” for U.S. federal income tax purposes at any time during the shorter of (x) the five-year period ending on the date of such sale, exchange or other disposition and (y) such Non-U.S. Holder’s holding period with respect to such common stock, and certain other conditions are met.

Generally, a corporation is a “United States real property holding corporation” if the fair market value of its United States real property interests equals or exceeds 50% of the sum of the fair market value of its worldwide real property interests and its other assets used or held for use in a trade or business (all as determined for U.S. federal income tax purposes). We believe that we presently are not, and wedo not presently anticipate that we will become, a United States real property holding corporation.

The foregoing discussion is subject to the discussion below under “— FATCA Withholding” and “— Information Reporting and Backup Withholding.”

FATCA Withholding

Under the Foreign Account Tax Compliance Actprovisions of the Code and related U.S. Treasury guidance (“FATCA”), a withholding tax of 30% will be imposed in certain circumstances on payments of (i) dividends on our common stock, and (ii) subject to the discussion of proposed Treasury Regulations below, gross proceeds from the sale or other disposition of our common stock. In the case of payments made to a “foreign financial institution” (such as a bank, a broker, an investment fund or, in certain cases, a holding company), as a beneficial owner or as an intermediary, this tax generally will be imposed, subject to certain

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exceptions, unless such institution (i) has agreed to (and does) comply with the requirements of an agreement with the United States (an “FFI Agreement”) or (ii) is required by (and does comply with) applicable foreign law enacted in connection with an intergovernmental agreement between the United States and a foreign jurisdiction (an “IGA”), in either case to, among other things, collect and provide to the U.S. tax authorities or other relevant tax authorities certain information regarding U.S. account holders of such institution, and, in either case, such institution provides the withholding agent with a certification as to its FATCA status. In the case of payments made to a foreign entity that is not a financial institution (as a beneficial owner), the tax generally will be imposed, subject to certain exceptions, unless such entity provides the withholding agent with a certification as to its FATCA status and, in certain cases, (i) certifies that it does not have any “substantial” U.S. owners (generally, any specified U.S. person that directly or indirectly owns more than a specified percentage of such entity) or (ii) identifies its substantial U.S. owners. If our common stock is held through a foreign financial institution that has agreed to comply with the requirements of an FFI Agreement, such foreign financial institution (or, in certain cases, a person paying amounts to such foreign financial institution) generally will be required, subject to certain exceptions, to withhold tax on certain payments made to (i) a person (including an individual) that fails to provide any required information or documentation or (ii) a foreign financial institution that has not agreed to comply with the requirements of an FFI Agreement and is not subject to similar requirements under applicable foreign law enacted in connection with an IGA. Similar withholding requirements may apply to foreign financial institutions that are subject to FATCA requirements pursuant to applicable foreign law enacted in connection with an IGA. Proposed Treasury Regulations eliminate FATCA withholding on payments of gross proceeds. Taxpayers generally may rely on these proposed Treasury Regulations until final Treasury Regulations are issued or the proposed Treasury Regulations are withdrawn. There can be no assurance that the proposed Treasury Regulations will be finalized in their present form. Each Non-U.S. Holder should consult its own tax advisor regarding the application of FATCA to the ownership and disposition of our common stock.

Information Reporting and Backup Withholding

Amounts treated as payments of dividends on our common stock paid to a Non-U.S. Holder and the amount of any U.S. federal tax withheld from such payments generally must be reported annually to the IRS and to such Non-U.S. Holder by the applicable withholding agent.

The information reporting and backup withholding rules that apply to payments of dividends to certain U.S. persons generally will not apply to payments of dividends on our common stock to a Non-U.S. Holder if such Non-U.S. Holder certifies under penalties of perjury that it is not a U.S. person (generally by providing an IRS Form W-8BEN or IRS Form W-8BEN-E to the applicable withholding agent) or otherwise establishes an exemption.

Proceeds from the sale, exchange or other disposition of our common stock by a Non-U.S. Holder effected outside the United States through a non-U.S. office of a non-U.S. broker generally will not be subject to the information reporting and backup withholding rules that apply to payments to certain U.S. persons, provided that the proceeds are paid to the Non-U.S. Holder outside the United States. However, proceeds from the sale, exchange or other disposition of our common stock by a Non-U.S. Holder effected through a non-U.S. office of a non-U.S. broker with certain specified U.S. connections or a U.S. broker generally will be subject to these information reporting rules (but generally not to these backup withholding rules), even if the proceeds are paid to such Non-U.S. Holder outside the United States, unless such Non-U.S. Holder certifies under penalties of perjury that it is not a U.S. person (generally by providing an IRS Form W-8BEN or IRS Form W-8BEN-E to the applicable withholding agent) or otherwise establishes an exemption. Proceeds from the sale, exchange or other disposition of our common stock by a Non-U.S. Holder effected through a U.S. office of a broker generally will be subject to these information reporting and backup withholding rules unless such Non-U.S. Holder certifies under penalties of perjury that it is not a U.S. person (generally by providing an IRS Form W-8BEN or IRS Form W-8BEN-E to the applicable withholding agent) or otherwise establishes an exemption.

Backup withholding is not an additional tax. Any amounts withheld under the backup withholding rules generally will be allowed as a refund or a credit against a Non-U.S. Holder’s U.S. federal income tax liability if the required information is furnished by such Non-U.S. Holder on a timely basis to the IRS.

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CERTAIN ERISA CONSIDERATIONS

The following is a summary of certain considerations associated with the purchase and holding of our common stock by employee benefit plans that are subject to Title I of the Employee Retirement Income Security Act of 1974, as amended (“ERISA”), plans, individual retirement accounts and other arrangements that are subject to Section 4975 of the Code or provisions under any U.S or non-U.S. federal, state, local, or other laws or regulations that are similar to such provisions of ERISA or the Code (collectively, “Similar Laws”), and entities whose underlying assets are considered to include “plan assets” of any such plan, account or arrangement under U.S. Department of Labor regulations as modified by Section 3(42) of ERISA, or any Similar Law (each, a “Plan”).

General Fiduciary Matters

ERISA and the Code impose certain duties on persons who are fiduciaries of a Plan subject to Title I of ERISA or Section 4975 of the Code (a “Covered Plan”) and prohibit certain transactions involving the assets of a Covered Plan and its fiduciaries or other persons (referred to as “parties in interest” within the meaning of ERISA or “disqualified persons” within the meaning of the Code) having certain relationships to a Covered Plan. Under ERISA and the Code, any person who exercises any discretionary authority or control over the administration of such a Covered Plan or the management or disposition of the assets of such a Covered Plan, or who renders investment advice for a fee or other compensation to such a Covered Plan, is generally considered to be a fiduciary of the Covered Plan.

In considering an investment in our common stock of a portion of the assets of any Plan, a fiduciary should determine whether the investment is in accordance with the documents and instruments governing the Planand the applicable provisions of ERISA, the Code or any Similar Law relating to a fiduciary’s duties to the Plan including, without limitation, the prudence, diversification, delegation of control and prohibited transaction provisions of ERISA, the Codeand any other applicable Similar Laws. The prudence of a particular investment in ourcommon stock must be determined by the responsible fiduciary of a Plan by taking into account the Plan’s particular circumstances and all of the facts and circumstances of the investment, including, but not limited to, the matters discussed under “Risk Factors.”

Prohibited Transaction Issues

Section 406 of ERISA and Section 4975 of the Code prohibit Covered Plans from engaging in specified transactions involving plan assets with persons or entities who are “parties in interest,” within the meaning of ERISA, or “disqualified persons,” within the meaning of Section 4975 of the Code, unless an exemption is available. A party in interest or disqualified person who engages in a non-exempt prohibited transaction may be subject to excise taxes and other penalties and liabilities under ERISAand the Code. In addition, the fiduciary of the Covered Plan that engages in such a non-exempt prohibited transaction may be subject to penalties and liabilities under ERISA and the Code. The acquisition and/or holding of our common stock by a Covered Plan with respect to which weor the underwriter is considered a party in interest or a disqualified person may constitute or result in a direct or indirect prohibited transaction under Section 406 of ERISA and/or Section 4975 of the Code, unless the investment is acquired and is held in accordance with an applicable statutory, class or individual prohibited transaction exemption. In this regard, the U.S. Department of Labor has issued prohibited transaction class exemptions, or “PTCEs,” that may apply to the acquisition and holding of our common stock. These class exemptions include, without limitation, PTCE 84-14 respecting transactions determined by independent qualified professional asset managers, PTCE 90-1 respecting insurance companypooled separate accounts, PTCE 91-38 respecting bank collective investment funds, PTCE 95-60 respecting life insurance company general accounts and PTCE 96-23 respecting transactions determined by in-house asset managers. There can be no assurance that the conditions of any of these exemptions or any other exemption will be satisfied.

Because of the foregoing, our common stock should not be purchased or held by any person investing “plan assets” of any Plan, unless such purchase and holding by the purchaser or holder thereof will not constitute or result in a non-exempt prohibited transaction under ERISA or the Code and will not constitute or result in a violation of any applicable Similar Laws.

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Governmental plans, certain church plans and foreign plans, while each not subject to the fiduciary responsibility provisions of ERISA or the prohibited transaction provisions of ERISA or Section 4975 of the Code, may nevertheless be subject to Similar Laws. Fiduciaries of any such plans should consult with their counsel before purchasing our common stock.

Representation

Each purchaser and subsequent transferee of our common stock will be deemed to have represented and warranted that either (i) no portion of the assets used by such purchaser or transferee to acquire and hold our common stock constitutes assets of any Plan or (ii) the purchase, holding and disposition of our common stock by such purchaser or transferee will not constitute or result in a non-exempt prohibited transaction under Section 406 of ERISA or Section 4975 of the Code or will not constitute or result in any similar violation under any applicable Similar Laws.

The foregoing discussion is general in nature and is not intended to be all inclusive. Due to, among other things, the complexity of these rules and the penalties that may be imposed upon persons involved in non-exempt prohibited transactions, it is particularly important that fiduciaries, or other persons considering purchasing and holding our common stock on behalf of, or with the assets of, any Plan, consult with their counsel regarding the potential applicability of ERISA, Section 4975 of the Code and any Similar Laws to such investment and to confirm that such investment will not constitute or result in a non-exempt prohibited transaction or any other violation of an applicable requirement under ERISA, the Code or any applicable Similar Law.

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UNDERWRITING

BofA Securities, Inc. is acting as the underwriter for this offering. Subject to the terms and conditions of the underwriting agreement, we have agreed to sell to the underwriter, and the underwriter has agreed to purchase from us, the number of shares of common stock listed next to its name in the following table:

Underwriter			Number of Shares
BofA Securities, Inc.					2,150,000

The underwriter is committed to purchase all the common shares offered by us if they purchase any shares, other than those shares covered by the underwriter’s option to purchase additional shares described below. We have granted an option to the underwriter, exercisable for 30 days after the date of this prospectus supplement, to purchase up to 322,500 additional shares of our common stock at a price of $ per share.

We are offering our common stock to the public through an underwriter who is acquiring the securities for its own account. The underwriter may resell the common stock in one or more transactions, including in negotiated transactions at a fixed public offering price or at varying prices determined at the time of sale. In connection with any such underwritten sale of common stock, the underwriter may receive compensation from us, for whom it may act as agent, in the form of discounts, concessions or commissions. The underwriter may sell common stock to or through dealers, and the dealers may receive compensation in the form of discounts, concessions or commissions from the underwriter and/or commissions from the purchasers for whom they may act as agent. Such compensation may be in excess of customary discounts, concessions or commissions. Any offering price and any discounts, concessions or commissions may be changed from time to time.

We estimate that the total expenses of this offering, including registration, filing and listing fees, printing fees and legal and accounting expenses will be approximately $ . We have agreed to reimburse the underwriter for expenses up to $30,000 related to clearance of this offering with the Financial Regulatory Authority, Inc., or FINRA.

A prospectus in electronic format may be made available on the web sites maintained by the underwriter, or selling group members, if any, participating in the offering. The underwriter may agree to allocate a number of shares to underwriter and selling group members for sale to their online brokerage account holders. Internet distributions will be allocated by the underwriter and selling group members that may make Internet distributions on the same basis as other allocations.

We have agreed that we will not (i) offer, sell, contract to sell, pledge, grant any option to purchase, make any short sale or otherwise dispose, except as provided in the underwriting agreement, of any of our securities that are substantially similar to the securities offered hereby, including but not limited to any options or warrants to purchase shares of our common stock or any securities that are convertible into or exchangeable for, or that represent the right to receive, shares of our common stock or any such substantially similar securities, or (ii) enter into any hedging or other transaction which is designed or which reasonably could be expected to lead to or result in a sale or disposition of our common stock (other than pursuant to employee stock option plans existing on, or upon the conversion, exercise or exchange of any option or convertible or exchangeable securities outstanding as of, the date of this prospectus supplement), in each case without the prior written consent of the underwriter for a period of 90 days after the date of this prospectus supplement.

Our directors and executive officers will enter into lock-up agreements with the underwriter prior to the commencement of this offering pursuant to which each of these persons or entities, for a period of 90 days after the date of this prospectus supplement, may not, without the prior written consent of the underwriter, offer, sell, contract to sell, pledge, grant any option to purchase, make any short sale or otherwise dispose of any shares of our common stock, or any options or warrants to purchase any shares of our common stock, or any securities convertible into, exchangeable for or that represent the right to receive shares of our common stock, subject to certain exceptions.

We have agreed to indemnify the underwriter against certain liabilities, including liabilities under the Securities Act, or contribute payments that the underwriter may be required to make in that respect.

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Our common stock is listed on the NYSE under the symbol SITE.

The underwriter has advised us that, in connection with this offering, the underwriter may engage in stabilizing transactions, which involves making bids for, purchasing and selling shares of common stock in the open market for the purpose of preventing or retarding a decline in the market price of the common stock while this offering is in progress. These stabilizing transactions may include making short sales of the common stock, which involves the sale by the underwriter of a greater number of shares of common stock than it is required to purchase in this offering, and purchasing shares of common stock on the open market to cover positions created by short sales. The underwriter may close out any covered short position by purchasing shares in the open market.

The underwriter has advised us that, pursuant to Regulation M of the Securities Act, it may also engage in other activities that stabilize, maintain or otherwise affect the price of the common stock, including the imposition of penalty bids.

These activities may have the effect of raising or maintaining the market price of the common stock or preventing or retarding a decline in the market price of the common stock, and, as a result, the price of the common stock may be higher than the price that otherwise might exist in the open market. If the underwriter commences these activities, it may discontinue them at any time. The underwriter may carry out these transactions on the NYSE, in the over-the-counter market or otherwise.

Selling Restrictions

Other than in the United States, no action has been taken by us or the underwriter that would permit a public offering of the securities offered by this prospectus supplement and the accompanying prospectus in any jurisdiction where action for that purpose is required. The securities offered by this prospectus supplement and the accompanying prospectus may not be offered or sold, directly or indirectly, nor may this prospectus supplement and the accompanying prospectus or any other offering material or advertisements in connection with the offer and sale of any such securities be distributed or published in any jurisdiction, except under circumstances that will result in compliance with the applicable rules and regulations of that jurisdiction. Persons into whose possession this prospectus supplement and the accompanying prospectus comes are advised to inform themselves about and to observe any restrictions relating to the offering and the distribution of this prospectussupplement and the accompanying prospectus. This prospectus supplement and the accompanying prospectus do not constitute an offer to sell or a solicitation of an offer to buy any securities offered by this prospectus supplement and the accompanying prospectus in any jurisdiction in which such an offer or a solicitation is unlawful.

European Economic Area and the United Kingdom

In relation to each Member State of the European Economic Area and the United Kingdom (each a “Relevant State”), no shares have been offered or will be offered pursuant to this offering to the public in that Relevant State prior to the publication of a prospectus in relation to the shares which has been approved by the competent authority in that Relevant State or, where appropriate, approved in another Relevant State and notified to the competent authority in that Relevant State, all in accordance with the Prospectus Regulation, except that offers of shares may be made to the public in that Relevant State at any time under the following exemptions under the Prospectus Regulation:

to any legal entity which is a qualified investor as defined under the Prospectus Regulation;

to fewer than 150 natural or legal persons (other than qualified investors as defined under the Prospectus Regulation), subject to obtaining the prior consent of the representatives for any such offer; or

in any other circumstances falling within Article 1(4) of the Prospectus Regulation,

provided that no such offer of shares shall require the Company or any underwriter to publish a prospectus pursuant to Article 3 of the Prospectus Regulation or supplement a prospectus pursuant to Article 23 of the Prospectus Regulation.

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Each person in a Relevant State (other than a Relevant State where there is a permitted public offer) who initially acquires any shares or to whom any offer is made will be deemed to have represented, acknowledged and agreed to and with the Company and the underwriter that it is a qualified investor within the meaning of the Prospectus Regulation.

In the case of any shares being offered to a financial intermediary as that term is used in Article 5(1) of the Prospectus Regulation, each such financial intermediary will be deemed to have represented, acknowledged and agreed that the shares acquired by it in the offer have not been acquired on a non-discretionary basis on behalf of, nor have they been acquired with a view to their offer or resale to, persons in circumstances which may give rise to an offer to the public other than their offer or resale in a Relevant State to qualified investors, in circumstances in which the prior consent of the underwriter has been obtained to each such proposed offer or resale.

The Company, the underwriter and its affiliates will rely upon the truth and accuracy of the foregoing representations, acknowledgements and agreements.

For the purposes of this provision, the expression an “offer to the public” in relation to any shares in any Relevant State means the communication in any form and by any means of sufficient information on the terms of the offer and any shares to be offered so as to enable an investor to decide to purchase or subscribe for any shares, and the expression “Prospectus Regulation” means Regulation (EU) 2017/1129 (as amended).

References to the Prospectus Regulation includes, in relation to the UK, the Prospectus Regulation as it forms part of UK domestic law by virtue of the European Union (Withdrawal) Act 2018.

The above selling restriction is in addition to any other selling restrictions set out below.

In connection with the offering, the underwriter and its affiliates are not acting for anyone other than the Company and will not be responsible to anyone other than the Company for providing the protections afforded to their clients nor for providing advice in relation to the offering.

Notice to Prospective Investors in the United Kingdom

This prospectus supplement is for distribution only to persons who (i) have professional experience in matters relating to investments and who qualify as investment professionals within the meaning of Article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005 (as amended, the “Financial Promotion Order”), (ii) are persons falling within Article 49(2)(a) to (d) (“high net worth companies, unincorporated associations etc.”) of the Financial Promotion Order, (iii) are outside the United Kingdom, or (iv) are persons to whom an invitation or inducement to engage in investment activity (within the meaning of Section 21 of the Financial Services and Markets Act 2000, as amended (“FSMA”)) in connection with the issue or sale of any securities may otherwise lawfully be communicated or caused to be communicated (all such persons together being referred to as “relevant persons”). This prospectus supplement is directed only at relevant persons and must not be acted on or relied on by persons who are not relevant persons. Any investment or investment activity to which this prospectus supplement relates is available only to relevant persons and will be engaged in only with relevant persons.

Notice to Prospective Investors in Switzerland

This prospectus supplement is not intended to constitute an offer or solicitation to purchase or invest in the shares. The shares may not be publicly offered, directly or indirectly, in Switzerland within the meaning of the Swiss Financial Services Act (“FinSA”) and no application has or will be made to admit the shares to trading on any trading venue (exchange or multilateral trading facility) in Switzerland. Neither this prospectus supplement nor any other offering or marketing material relating to the shares constitutes a prospectus pursuant to the FinSA, and neither this prospectus supplement nor any other offering or marketing material relating to the shares may be publicly distributed or otherwise made publicly available in Switzerland.

Notice to Prospective Investors in the Dubai International Financial Centre

This prospectus supplement relates to an Exempt Offer in accordance with the Offered Securities Rules of the Dubai Financial Services Authority (“DFSA”). This prospectus supplement is intended for distribution

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only to persons of a type specified in the Offered Securities Rules of the DFSA. It must not be delivered to, or relied on by, any other person. The DFSA has no responsibility for reviewing or verifying any documents in connection with Exempt Offers. The DFSA has not approved this prospectus supplement nor taken steps to verify the information set forth herein and has no responsibility for the prospectus supplement. The shares to which this prospectus supplement relates may be illiquid and/or subject to restrictions on their resale. Prospective purchasers of the shares offered should conduct their own due diligence on the shares. If you do not understand the contents of this prospectus supplement you should consult an authorized financial advisor.

Notice to Prospective Investors in Australia

No placement document, prospectus, product disclosure statement or other disclosure document has been lodged with the Australian Securities and Investments Commission (“ASIC”), in relation to the offering. This prospectus supplement does not constitute a prospectus, product disclosure statement or other disclosure document under the Corporations Act 2001 (the “Corporations Act”), and does not purport to include the information required for a prospectus, product disclosure statement or other disclosure document under the Corporations Act.

Any offer in Australia of the shares may only be made to persons (the “Exempt Investors”) who are “sophisticated investors” (within the meaning of section 708(8) of the Corporations Act), “professional investors” (within the meaning of section 708(11) of the Corporations Act) or otherwise pursuant to one or more exemptions contained in section 708 of the Corporations Act so that it is lawful to offer the shares without disclosure to investors under Chapter 6D of the Corporations Act.

The shares applied for by Exempt Investors in Australia must not be offered for sale in Australia in the period of 12 months after the date of allotment under the offering, except in circumstances where disclosure to investors under Chapter 6D of the Corporations Act would not be required pursuant to an exemption under section 708 of the Corporations Act or otherwise or where the offer is pursuant to a disclosure document which complies with Chapter 6D of the Corporations Act. Any person acquiring shares must observe such Australian on-sale restrictions.

This prospectus supplement contains general information only and does not take account of the investment objectives, financial situation or particular needs of any particular person. It does not contain any securities recommendations or financial product advice. Before making an investment decision, investors need to consider whether the information in this prospectus supplement is appropriate to their needs, objectives and circumstances, and, if necessary, seek expert advice on those matters.

Notice to Prospective Investors in Hong Kong

The shares have not been offered or sold and will not be offered or sold in Hong Kong, by means of any document, other than (a) to “professional investors” as defined in the Securities and Futures Ordinance (Cap. 571) of Hong Kong and any rules made under that Ordinance; or (b) in other circumstances which do not result in the document being a “prospectus” as defined in the Companies Ordinance (Cap. 32) of Hong Kong or which do not constitute an offer to the public within the meaning of that Ordinance. No advertisement, invitation or document relating to the shares has been or may be issued or has been or may be in the possession of any person for the purposes of issue, whether in Hong Kong or elsewhere, which is directed at, or the contents of which are likely to be accessed or read by, the public of Hong Kong (except if permitted to do so under the securities laws of Hong Kong) other than with respect to shares which are or are intended to be disposed of only to persons outside Hong Kong or only to “professional investors” as defined in the Securities and Futures Ordinance and any rules made under that Ordinance.

Notice to Prospective Investors in Japan

The shares have not been and will not be registered under the Financial Instruments and Exchange Law of Japan (Law No. 25 of 1948, as amended) and, accordingly, will not be offered or sold, directly or indirectly, in Japan, or for the benefit of any Japanese Person or to others for re-offering or resale, directly or indirectly, in Japan or to any Japanese Person, except in compliance with all applicable laws, regulations and ministerial guidelines promulgated by relevant Japanese governmental or regulatory authorities in effect at the relevant

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time. For the purposes of this paragraph, “Japanese Person” shall mean any person resident in Japan, including any corporation or other entity organized under the laws of Japan.

Notice to Prospective Investors in Singapore

This prospectus supplement has not been registered as a prospectus with the Monetary Authority of Singapore. Accordingly, the shares were not offered or sold or caused to be made the subject of an invitation for subscription or purchase and will not be offered or sold or caused to be made the subject of an invitation for subscription or purchase, and this prospectus supplement or any other document or material in connection with the offer or sale, or invitation for subscription or purchase, of the shares, has not been circulated or distributed, nor will it be circulated or distributed, whether directly or indirectly, to any person in Singapore other than (i) to an institutional investor (as defined in Section 4A of the Securities and Futures Act (Chapter 289) of Singapore, as modified or amended from time to time (the “SFA”)) pursuant to Section 274 of the SFA, (ii) to a relevant person (as defined in Section 275(2) of the SFA) pursuant to Section 275(1) of the SFA, or any person pursuant to Section 275(1A) of the SFA, and in accordance with the conditions specified in Section 275 of the SFA, or (iii) otherwise pursuant to, and in accordance with the conditions of, any other applicable provision of the SFA.

Where the shares are subscribed or purchased under Section 275 of the SFA by a relevant person which is:

(a)

a corporation (which is not an accredited investor (as defined in Section 4A of the SFA)) the sole business of which is to hold investments and the entire share capital of which is owned by one or more individuals, each of whom is an accredited investor; or

(b)

a trust (where the trustee is not an accredited investor) whose sole purpose is to hold investments and each beneficiary of the trust is an individual who is an accredited investor, securities or securities-based derivatives contracts (each term as defined in Section 2(1) of the SFA) of that corporation or the beneficiaries’ rights and interest (howsoever described) in that trust shall not be transferred within six months after that corporation or that trust has acquired the shares pursuant to an offer made under Section 275 of the SFA except:

(i)

to an institutional investor or to a relevant person, or to any person arising from an offer referred to in Section 275(1A) or Section 276(4)(i)(B) of the SFA;

(ii)

where no consideration is or will be given for the transfer;

(iii)

where the transfer is by operation of law; or

(iv)

as specified in Section 276(7) of the SFA.

Notice to Prospective Investors in Canada

The shares may be sold only to purchasers purchasing, or deemed to be purchasing, as principal that are accredited investors, as defined in National Instrument 45-106 Prospectus Exemptions or subsection 73.3(1) of the Securities Act (Ontario), and are permitted clients, as defined in National Instrument 31-103 Registration Requirements, Exemptions and Ongoing Registrant Obligations. Any resale of the shares must be made in accordance with an exemption from, or in a transaction not subject to, the prospectus requirements of applicable securities laws.

Securities legislation in certain provinces or territories of Canada may provide a purchaser with remedies for rescission or damages if this prospectus supplement (including any amendment thereto) contains a misrepresentation, provided that the remedies for rescission or damages are exercised by the purchaser within the time limit prescribed by the securities legislation of the purchaser’s province or territory. The purchaser should refer to any applicable provisions of the securities legislation of the purchaser’s province or territory for particulars of these rights or consult with a legal advisor.

Pursuant to section 3A.3 (or, in the case of securities issued or guaranteed by the government of a non-Canadian jurisdiction, section 3A.4) of National Instrument 33-105 Underwriting Conflicts (NI 33-105), the

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underwriter is not required to comply with the disclosure requirements of NI 33-105 regarding underwriter conflicts of interest in connection with this offering.

Other Relationships

The underwriter and its affiliates are a full service financial institution engaged in various activities, which may include sales and trading, commercial and investment banking, advisory, investment management, investment research, principal investment, hedging, market making, brokerage and other financial and non-financial activities and services. The underwriter and its respective affiliates have provided, and may in the future provide, a variety of these services to the issuer and to persons and entities with relationships with the issuer, for which they received or will receive customary fees and expenses. For example, an affiliate of the underwriter acts as an agent and a lender under our ABL Facility and our Term Loan Facility.

In the ordinary course of their various business activities, the underwriter and its affiliates, officers, directors and employees may purchase, sell or hold a broad array of investments and actively traded securities, derivatives, loans, commodities, currencies, credit default swaps and other financial instruments for their own account and for the accounts of their customers, and such investment and trading activities may involve or relate to assets, securities and/or instruments of the issuer (directly, as collateral securing other obligations or otherwise) and/or persons and entities with relationships with the issuer. The underwriter and its affiliates may also communicate independent investment recommendations, market color or trading ideas and/or publish or express independent research views in respect of such assets, securities or instruments and may at any time hold, or recommend to clients that they should acquire, long and/or short positions in such assets, securities and instruments.

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VALIDITY OF COMMON STOCK

The validity of the common stock offered in this offering will be passed upon for us by King & Spalding LLP, Atlanta, Georgia. Certain legal matters with respect to this offering will be passed upon for the underwriter by Simpson Thacher & Bartlett LLP, New York, New York.

EXPERTS

The consolidated financial statements and the related financial statement schedule incorporated by reference in this prospectus supplement and the effectiveness of SiteOne Landscape Supply Inc.’s internal control over financial reporting have been audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in their reports, which are incorporated by reference herein. Such consolidated financial statements and financial statement schedule are incorporated by reference in reliance upon the report of such firm given upon their authority as experts in accounting and auditing.

WHERE YOU CAN FIND MORE INFORMATION

This prospectus supplement and any accompanying prospectus are part of a registration statement that we filed with the SEC and do not contain all the information set forth in the registration statement and the exhibits thereto. Some items are omitted in accordance with the rules and regulations of the SEC. For further information with respect to us and the common stock offered hereby, we refer you to the registration statement and the exhibits filed therewith. Statements contained in this prospectus supplement, any accompanying prospectus and the documents incorporated or deemed to be incorporated by reference herein or therein as to the contents of any contract, agreement or any other document referred to are summaries of the material terms of the respective contract, agreement or other document. With respect to each of these contracts, agreements or other documents filed as an exhibit to the registration statement or the documents incorporated or deemed to be incorporated by reference into this prospectus supplement or any accompanying prospectus, reference is made to the exhibits for a more complete description of the matter involved.

The SEC maintains an internet site at http://www.sec.gov, from which interested persons can electronically access the registration statement and the documents incorporated or deemed to be incorporated by reference therein, including the exhibits and any schedules thereto. Copies of the registration statement and the documents incorporated or deemed to be incorporated by reference therein, including the exhibits and schedules thereto, are also available at your request, without charge, from SiteOne Landscape Supply, Inc., 300 Colonial Center Parkway, Suite 600, Roswell, Georgia 30076.

We are subject to the informational requirements of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and, accordingly, file annual reports containing financial statements audited by an independent registered public accounting firm, quarterly reports containing unaudited financial statements, current reports, proxy statements and other information with the SEC. You may inspect the materials without charge at the SEC’s website.

You may access, free of charge, our reports filed with the SEC (for example, our Annual Reports on Form 10-K, our Quarterly Reports on Form 10-Q and our Current Reports on Form 8-K and any amendments to those forms) through our website (http://investors.siteone.com). Reports filed with or furnished to the SEC will be available as soon as reasonably practicable after they are filed with or furnished to the SEC. None of the information contained on, or that may be accessed through, our websites or any other website identified herein is part of, or incorporated into, this prospectus supplement. All website addresses in this prospectus supplement are intended to be inactive textual references only.

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INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

The SEC allows us to “incorporate by reference” into this prospectus supplement information we file with the SEC in other documents. This means that we can disclose important information to you by referring to another document we have filed with the SEC. The information relating to us contained in this prospectus supplement should be read together with the information in the documents incorporated or deemed to be incorporated by reference.

We incorporate by reference, as of their respective dates of filing, the documents listed below (excluding any portions of such documents that have been “furnished” but not “filed” for purposes of the Exchange Act):

•

our Annual Report on Form 10-K for the year ended December 29, 2019, filed with the SEC on February 26, 2020 (SEC File No. 001-37760);

•

the subsection “Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations — Results of Operations — Comparison of the 2018 Fiscal Year to the 2017 Fiscal Year” included in our Annual Report on Form 10-K for the year ended December 31, 2018, filed with the SEC on February 27, 2019 (SEC File No. 001-37760);

•

our Quarterly Reports on Form 10-Q for the quarter ended March 29, 2020, filed with the SEC on April 29, 2020 and for the quarter ended June 28, 2020, filed with the SEC on July 29, 2020 (SEC File No. 001-37760);

•

our Current Reports on Form 8-K filed with the SEC on February 12, 2020, April 1, 2020 (but only with respect to Item 2.03), May 15, 2020 and July 27, 2020;

•

our Definitive Proxy Statement on Schedule 14A filed with the SEC on April 1, 2020 (SEC File No. 001-37760) (only those parts incorporated in our Annual Report on Form 10-K for the year ended December 29, 2019); and

•

all documents filed by us with the SEC pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act, as amended (other than Current Reports on Form 8-K furnished under Items 2.02 and 7.01 (including any financial statements or exhibits relating thereto furnished pursuant to Item 9.01) of Form 8-K and not specifically incorporated by reference), after the date of this prospectus supplement.

You should read the information relating to us in this prospectus supplement and the accompanying prospectus together with the information in the documents incorporated or deemed to be incorporated by reference herein. Nothing contained herein shall be deemed to incorporate information furnished to, but not filed with, the SEC.

Any statement incorporated by reference in this prospectus supplement from an earlier dated document that is inconsistent with a statement contained in this prospectus supplement or in any other document filed after the date of the earlier dated document, but prior to the date hereof, which also is incorporated by reference in this prospectus supplement, shall be deemed to be modified or superseded for purposes of this prospectus supplement by such statement contained in this prospectus supplement or in any other document filed after the date of the earlier dated document, but prior to the date hereof, which also is incorporated by reference in this prospectus supplement.

Any person, including any beneficial owner, to whom this prospectus supplement and the accompanying prospectus is delivered may request copies of any of the documents incorporated or deemed to be incorporated by reference in this prospectus supplement, without charge, by written or oral request directed to SiteOne Landscape Supply, Inc., c/o Briley Brisendine, Secretary, 300 Colonial Center Parkway, Roswell, Georgia 30076, Telephone: (470) 277-7000 or the Investor Relations portion of our website at http://investors.siteone.com or from the SEC through the SEC’s Internet website at the address provided under “Where You Can Find More Information.” All other information contained on our website is not a part of this prospectus supplement. Documents incorporated or deemed to be incorporated by reference in this prospectus supplement are available without charge, excluding any exhibits to those documents unless the exhibit is specifically incorporated by reference into those documents.

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PROSPECTUS

SiteOne Landscape Supply, Inc.

Common Stock

SiteOne Landscape Supply, Inc. may offer and sell from time to time shares of its common stock.

The specific amount and price of the common stock will be determined at the time of any offering set forth in the applicable prospectus supplement.

The securities may be offered directly by us through agents designated from time to time by us or to or through underwriters or dealers. If any agents, dealers or underwriters are involved in the sale of any of the common stock, their names, and any applicable purchase price, fee, commission or discount arrangement between or among them, will be set forth, or will be calculable from the information set forth, in the applicable prospectus supplement. See the sections entitled “Plan of Distribution” and “About This Prospectus” for more information. No common stock may be sold without delivery of this prospectus and the applicable prospectus supplement describing the method and terms of the specific offering.

The common stock of SiteOne Landscape Supply, Inc. is listed on the New York Stock Exchange under the symbol SITE. The last reported sale price of our common stock on July 31, 2020 was $128.03 per share.

Investing in our common stock involves risks. See the section entitled “Risk Factors” on page 4 of this prospectus and any risk factors described in the applicable prospectus supplement and in the documents we incorporate by reference.

Neither the U.S. Securities and Exchange Commission (the “SEC”) nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus. Any representation to the contrary is a criminal offense.

The date of this prospectus is August 3, 2020.

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ABOUT THIS PROSPECTUS

Unless the context otherwise indicates or requires, as used in this prospectus, the terms “Company,” “SiteOne,” “we,” “us” and “our” mean SiteOne Landscape Supply, Inc. and its consolidated subsidiaries. The term “Holdings” refers to SiteOne Landscape Supply, Inc. individually without its subsidiaries.

This prospectus is part of an “automatic shelf” registration statement on Form S-3 that we filed with the SEC as a “well-known seasoned issuer” as defined in Rule 405 under the Securities Act of 1933, as amended (the “Securities Act”), utilizing a “shelf” registration process. Under this shelf registration process, we over time may offer and sell shares of our common stock in one or more offerings or resales. This prospectus provides you with a general description of the shares of common stock we may offer. Each time we sell common stock, we will provide a prospectus supplement containing specific information about the terms of the applicable offering. Such prospectus supplement may add, update or change information contained in this prospectus. You should read this prospectus and the applicable prospectus supplement together with additional information described under the heading “Where You Can Find More Information.”

We may offer the securities directly, through agents, or to or through underwriters. The applicable prospectus supplement will describe the terms of the plan of distribution and set forth the names of any underwriters involved in the sale of the common stock. See “Plan of Distribution” for more information. No common stock may be sold without delivery of a prospectus supplement describing the method and terms of the specific offering.

The rules of the SEC allow us to incorporate information by reference into this prospectus. This information incorporated by reference is considered to be part of this prospectus, and information that we file later with the SEC will automatically update and supersede this information. See “Incorporation of Certain Information by Reference.” You should read both this prospectus and any prospectus supplement together with additional information described under the heading “Where You Can Find More Information.”

Neither we nor any underwriters have authorized anyone to provide you with different information or to make any representations other than those contained or incorporated by reference into this prospectus, any accompanying prospectus supplement or in any free writing prospectuses we have prepared. If anyone provides you with different or inconsistent information, you should not rely on it. This prospectus and any accompanying prospectus supplement do not constitute an offer to sell, or a solicitation of an offer to purchase, the securities offered by this prospectus and any accompanying prospectus supplement in any jurisdiction in which it is unlawful to make such offer or solicitation.

You should not assume that the information incorporated by reference or provided in this prospectus or any accompanying prospectus supplement or any free writing prospectus prepared by us is accurate as of any date other than the date on the front cover of those documents. Our business, financial condition, results of operations and prospects may have changed since that date.

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OUR COMPANY

Our principal executive offices are located at 300 Colonial Center Parkway, Suite 600, Roswell, Georgia 30076, and our telephone number at that address is (470) 277-7000.

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RISK FACTORS

An investment in our common stock involves a high degree of risk. Before making an investment decision, you should carefully consider the specific risks described under the heading “Risk Factors” in the applicable prospectus supplement and under the caption “Risk Factors” in any of our filings with the SEC pursuant to Sections 13(a), 14 or 15(d) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), including our Annual Report on Form 10-K for the year ended December 29, 2019 filed with the SEC on February 26, 2020 and our Quarterly Reports on Form 10-Q for the quarterly periods ended March 29, 2020 and June 28, 2020 filed with the SEC on April 29, 2020 and July 29, 2020, respectively, which are incorporated by reference into this prospectus. If any of these risks, as well as other risks and uncertainties that are not yet identified or that we currently think are immaterial, actually occur, our business, results of operations or financial condition could be materially and adversely affected. In such an event, the trading price of our common stock could decline and you could lose part or all of your investment.

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FORWARD-LOOKING STATEMENTS

This prospectus, any accompanying prospectus supplement and the documents incorporated or deemed to be incorporated by reference herein or therein contain forward-looking statements and cautionary statements within the meaning of the Private Securities Litigation Reform Act of 1995. Some of the forward-looking statements can be identified by the use of terms such as “may,” “intend,” “might,” “will,” “should,” “could,” “would,” “expect,” “believe,” “estimate,” “anticipate,” “predict,” “project,” “potential,” or the negative of these terms, and similar expressions. You should be aware that these forward-looking statements are subject to risks and uncertainties that are beyond our control. Further, any forward-looking statement speaks only as of the date on which it is made, and we undertake no obligation to update any forward-looking statement to reflect events or circumstances after the date on which it is made or to reflect the occurrence of anticipated or unanticipated events or circumstances. New factors that could cause our business not to develop as we expect may emerge from time to time, and it is not possible for us to predict all of them. Factors that may cause actual results to differ materially from those expressed or implied by the forward-looking statements include, but are not limited to, the following:

•

the potential negative impact of the ongoing COVID-19 pandemic (which, among other things, may exacerbate each of the risks listed below);

•

economic downturn or recession;

•

cyclicality in residential and commercial construction markets;

•

general economic and financial conditions;

•

weather conditions, seasonality and availability of water to end-users;

•

public perceptions that our products and services are not environmentally friendly;

•

competitive industry pressures;

•

cybersecurity incidents including the July 2020 ransomware attack;

•

product shortages and the loss of key suppliers;

•

product price fluctuations;

•

ability to pass along product cost increases;

•

inventory management risks;

•

ability to implement our business strategies and achieve our growth objectives;

•

acquisition and integration risks;

•

increased operating costs;

•

risks associated with our large labor force (including work stoppages due to COVID-19);

•

retention of key personnel;

•

construction defect and product liability claims;

•

impairment of goodwill;

•

adverse credit and financial markets events and conditions (which have worsened and may continue to worsen as a result of the ongoing COVID-19 pandemic);

•

credit sale risks;

•

performance of individual branches;

•

environmental, health and safety laws and regulations;

•

hazardous materials and related materials;

•

laws and government regulations applicable to our business that could negatively impact demand for our products;

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•

computer data processing systems;

•

security of personal information about our customers;

•

intellectual property and other proprietary rights;

•

the possibility of securities litigation;

•

unanticipated changes in our tax provisions;

•

our substantial indebtedness and our ability to obtain financing in the future;

•

increases in interest rates;

•

risks related to our common stock;

•

terrorism or the threat of terrorism; and

•

risks related to other factors discussed in this prospectus, any accompanying prospectus supplement and the documents incorporated or deemed to be incorporated by reference in this prospectus.

You should read this prospectus, any accompanying prospectus supplement and the documents incorporated or deemed to be incorporated by reference herein or therein completely and with the understanding that actual future results may be materially different from expectations. All forward-looking statements made in this prospectus, any accompanying prospectus supplement and the documents incorporated or deemed to be incorporated by reference herein or therein are qualified by these cautionary statements. These forward-looking statements are made only as of the date presented, and we do not undertake any obligation, other than as may be required by law, to update or revise any forward-looking or cautionary statements to reflect changes in assumptions, the occurrence of events, unanticipated or otherwise, and changes in future operating results over time or otherwise.

Comparisons of results for current and any prior periods are not intended to express any future trends, or indications of future performance, unless expressed as such, and should only be viewed as historical data.

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DESCRIPTION OF CAPITAL STOCK

The following summary does not purport to be complete and is subject to and qualified in its entirety by reference to the General Corporation Law of the State of Delaware (the “DGCL”), Holdings’ Third Amended and Restated Certificate of Incorporation (“Charter”) and Holdings’ Third Amended and Restated By-laws (“By-laws”), as each may be amended from time to time.

General

The Company has the authority to issue up to 1,000,000,000 shares of common stock, par value $0.01 per share. As of July 31, 2020, there were 42,006,219 shares of our common stock issued and outstanding.

Common Stock

Holders of common stock are entitled:

•

to cast one vote for each share held of record on all matters submitted to a vote of the stockholders;

•

to receive, on a pro rata basis, dividends and distributions, if any, that our board of directors may declare out of legally available funds, subject to preferences that may be applicable to preferred stock, if any, then outstanding; and

•

upon our liquidation, dissolution or winding up, to share equally and ratably in any assets remaining after the payment of all debt and other liabilities, subject to the prior rights, if any, of holders of any outstanding shares of preferred stock.

Our ability to pay dividends on our common stock is subject to our subsidiaries’ ability to pay dividends to us, which is in turn subject to the restrictions set forth in the agreements that govern our indebtedness.

The holders of our common stock do not have any preemptive, cumulative voting, subscription, conversion, redemption or sinking fund rights. The common stock is not subject to future calls or assessments by us. The rights and privileges of holders of our common stock are subject to any series of preferred stock that we may issue in the future.

Our common stock is listed on the NYSE under the symbol SITE.

Preferred Stock

Under Holdings’ Charter, our board of directors has the authority, without further action by our stockholders, to issue up to 100,000,000 shares of preferred stock in one or more series and to fix the voting powers, designations, preferences and the relative participating, optional or other special rights, and the qualifications, limitations and restrictions of each series, including dividend rights, dividend rates, conversion rights, voting rights, terms of redemption, liquidation preferences and the number of shares constituting any series. No shares of our authorized preferred stock are currently outstanding. Because the board of directors has the power to establish the preferences and rights of the shares of any additional series of preferred stock, it may afford holders of any preferred stock preferences, powers and rights, including voting and dividend rights, senior to the rights of holders of our common stock, which could adversely affect the holders of the common stock and could delay, discourage or prevent a takeover of us even if a change of control of our company would be beneficial to the interests of our stockholders.

Annual Stockholders Meeting

Holdings’ By-laws provide that annual stockholder meetings will be held at a date, time and place, if any, as exclusively selected by our board of directors. To the extent permitted under applicable law, we may conduct meetings by remote communications, including by webcast.

Voting

The affirmative vote of a plurality of the shares of our common stock present, in person or by proxy, at the meeting and entitled to vote on the election of directors will decide the election of any directors, and the

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affirmative vote of a majority of the shares of our common stock present, in person or by proxy, at the meeting and entitled to vote at any annual or special meeting of stockholders will decide all other matters voted on by stockholders, unless the question is one upon which, by express provision of law, under Holdings’ Charter, or under our By-laws, a different vote is required, in which case such provision will control.

Anti-Takeover Effects of Our Certificate of Incorporation and By-Laws

The provisions of Holdings’ Charter and By-laws summarized below may have an anti-takeover effect and may delay, defer or prevent a tender offer or takeover attempt that you might consider in your best interest, including an attempt that might result in your receipt of a premium over the market price for your shares. These provisions are also designed, in part, to encourage persons seeking to acquire control of us to first negotiate with our board of directors, which could result in an improvement of their terms.

Authorized but Unissued Shares of Common Stock. Shares of our authorized and unissued common stock are available for future issuances without additional stockholder approval. While the additional shares are not designed to deter or prevent a change of control, under some circumstances we could use the additional shares to create voting impediments or to frustrate persons seeking to effect a takeover or otherwise gain control by, for example, issuing those shares in private placements to purchasers who might side with our board of directors in opposing a hostile takeover bid.

Authorized but Unissued Shares of Preferred Stock. Under Holdings’ Charter, our board of directors has the authority, without further action by our stockholders, to issue up to 100,000,000 shares of preferred stock in one or more series and to fix the voting powers, designations, preferences and the relative participating, optional or other special rights and qualifications, limitations and restrictions of each series, including dividend rights, dividend rates, conversion rights, voting rights, terms of redemption, liquidation preferences and the number of shares constituting any series. The existence of authorized but unissued preferred stock could reduce our attractiveness as a target for an unsolicited takeover bid since we could, for example, issue shares of preferred stock to parties who might oppose such a takeover bid or shares that contain terms the potential acquiror may find unattractive. This may have the effect of delaying or preventing a change of control, may discourage bids for the common stock at a premium over the market price of the common stock, and may adversely affect the market price of, and the voting and other rights of the holders of, our common stock.

Classified Board of Directors. In accordance with the terms of Holdings’ Charter, our board of directors is divided into three classes, Class I, Class II and Class III, with members of each class serving staggered three-year terms. Under Holdings’ Charter, our board of directors consists of such number of directors as may be determined from time to time by resolution of the board of directors, but in no event may the number of directors be less than one. Any additional directorships resulting from an increase in the number of directors will be distributed among the three classes so that, as nearly as possible, each class will consist of one-third of the directors. Holdings’ Charter also provides that any vacancy on our board of directors, including a vacancy resulting from an enlargement of our board of directors, may be filled only by the affirmative vote of a majority of our directors then in office, even if less than a quorum, or by a sole remaining director. Any director elected to fill a vacancy will hold office until such director’s successor shall have been duly elected and qualified or until such director’s earlier death, resignation or removal. Our classified board of directors could have the effect of delaying or discouraging an acquisition of us or a change in our management.

Removal of Directors. Holdings’ Charter provides that directors may be removed only for cause upon the affirmative vote of holders of at least a majority of the outstanding shares of common stock then entitled to vote at an election of directors.

Special Meetings of Stockholders. Holdings’ Charter provides that a special meeting of stockholders may be called only by the Chairman of our board of directors or by a resolution adopted by a majority of our board of directors. Stockholders are not permitted to call a special meeting of stockholders.

Stockholder Advance Notice Procedure. Holdings’ By-laws establish an advance notice procedure for stockholders to make nominations of candidates for election as directors or to bring other business before an annual meeting of our stockholders. The By-laws provide that any stockholder wishing to nominate persons for election as directors at, or bring other business before, an annual meeting must deliver to our corporate secretary a written notice of the stockholder’s intention to do so. These provisions may have the effect of

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precluding the conduct of certain business at a meeting if the proper procedures are not followed. We expect that these provisions may also discourage or deter a potential acquirer from conducting a solicitation of proxies to elect the acquirer’s own slate of directors or otherwise attempting to obtain control of our company. To be timely, the stockholder’s notice must be delivered to our corporate secretary at our principal executive offices not less than 90 days nor more than 120 days before the first anniversary date of the annual meeting for the preceding year; provided, however, that in the event that the annual meeting is set for a date that is more than 30 days before or more than 70 days after the first anniversary date of the preceding year’s annual meeting, a stockholder’s notice must be delivered to our corporate secretary (x) not less than 90 days nor more than 120 days prior to the meeting or (y) no later than the close of business on the 10th day following the day on which a public announcement of the date of the meeting is first made by us.

No Stockholder Action by Written Consent. Holdings’ Charter provides that stockholder action may be taken only at an annual meeting or special meeting of stockholders.

Limitations on Liability and Indemnification

Holdings’ Charter contains provisions permitted under the DGCL relating to the liability of directors. These provisions eliminate a director’s personal liability for monetary damages resulting from a breach of fiduciary duty, except in circumstances involving:

•

any breach of the director’s duty of loyalty;

•

acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of the law;

•

Section 174 of the DGCL (unlawful dividends); or

•

any transaction from which the director derives an improper personal benefit.

The principal effect of the limitation on liability provision is that a stockholder will be unable to prosecute an action for monetary damages against a director unless the stockholder can demonstrate a basis for liability for which indemnification is not available under the DGCL. These provisions, however, should not limit or eliminate our rights or any stockholder’s rights to seek non-monetary relief, such as an injunction or rescission, in the event of a breach of a director’s fiduciary duty. These provisions do not alter a director’s liability under federal securities laws. The inclusion of this provision in Holdings’ Charter may discourage or deter stockholders or management from bringing a lawsuit against directors for a breach of their fiduciary duties, even though such an action, if successful, might otherwise have benefited us and our stockholders. Holdings’ Charter and Holdings’ By-laws require us to indemnify and advance expenses to our directors and officers to the fullest extent not prohibited by the DGCL and other applicable law, except in the case of a proceeding instituted by the director without the approval of our board of directors. Holdings’ Charter and Holdings’ By-laws provide that we are required to indemnify our directors and executive officers, to the fullest extent permitted by law, for all judgments, fines, settlements, legal fees and other expenses incurred in connection with pending or threatened legal proceedings because of the director’s or officer’s positions with us or another entity that the director or officer serves at our request, subject to various conditions, and to advance funds to our directors and officers to enable them to defend against such proceedings. To receive indemnification, the director or officer must have been successful in the legal proceeding or have acted in good faith and in what was reasonably believed to be a lawful manner in our best interest and, with respect to any criminal proceeding, have had no reasonable cause to believe his or her conduct was unlawful. Your investment may be adversely affected to the extent we pay costs of settlement and damage awards against directors and officers pursuant to these indemnification provisions.

Section 203 of Delaware General Corporation Law

We are subject to Section 203 of the Delaware General Corporation Law (“Section 203”), an anti-takeover law. In general, Section 203 prohibits a publicly held Delaware corporation from engaging in a business combination with an interested stockholder for a period of three years following the date such person became an interested stockholder, unless the business combination or the transaction in which such person became an interested stockholder is approved in a prescribed manner. Generally, a “business combination” includes a merger, asset or stock sale, or other transaction resulting in a financial benefit to the interested

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stockholder. Generally, an “interested stockholder” is a person that, together with affiliates and associates, owns, or within three years prior to the determination of interested stockholder status did own, 15% or more of a corporation’s voting stock. The existence of this provision may have an anti-takeover effect with respect to transactions not approved in advance by the board, including discouraging attempts that might result in a premium over the market price for the shares of common stock.

Choice of Forum

Holdings’ Charter provides that the Court of Chancery of the State of Delaware is, to the fullest extent permitted by law, the sole and exclusive forum for (i) any derivative action or proceeding brought on our behalf, (ii) any action asserting a claim of breach of a fiduciary duty owed to us or our stockholders by any of our directors, officers, other employees, agents or stockholders, (iii) any action asserting a claim arising out of or under the DGCL or as to which the DGCL confers jurisdiction on the Court of Chancery of the State of Delaware (including, without limitation, any action asserting a claim arising out of or pursuant to Holdings’ Charter or Holdings’ By-laws) or (iv) any action asserting a claim that is governed by the internal affairs doctrine. By becoming a stockholder in our company, you will be deemed to have notice of and have consented to the provisions of Holdings’ Charter related to choice of forum.

Market Listing

Our common stock is listed on the NYSE under the symbol SITE.

Transfer Agent and Registrar

The transfer agent and registrar for our common stock is American Stock Transfer & Trust Company.

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PLAN OF DISTRIBUTION

General

We may sell the shares of our common stock covered by this prospectus using one or more of the following methods:

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to or through underwriters in a public offering;

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“at the market” to or through market makers or into an existing market for the securities;

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ordinary brokerage transactions and transactions in which the broker-dealer solicits purchasers;

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block trades in which the broker-dealer will attempt to sell the securities as agent but may position and resell a portion of the block as principal to facilitate the transaction;

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purchases by a broker-dealer as principal and resale by the broker-dealer for its account;

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privately negotiated transactions;

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short sales (including short sales “against the box”);

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through the writing or settlement of standardized or over-the-counter options or other hedging or derivative transactions, whether through an options exchange or otherwise;

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by pledge to secure debts and other obligations;

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in other ways not involving market makers or established trading markets, including direct sales to purchasers or sales effected through agents;

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a combination of any such methods of sale; and

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any other method permitted pursuant to applicable law.

The distribution of the common stock may be effected from time to time in one or more transactions: at a fixed price, or prices, which may be changed from time to time; at market prices prevailing at the time of sale; at prices related to such prevailing market prices; or at negotiated prices.

To the extent required by law, this prospectus may be amended or supplemented from time to time to describe a specific plan of distribution. Any prospectus supplement relating to a particular offering of our common stock us may include the following information to the extent required by law:

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the terms of the offering;

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the names of any underwriters or agents and the amounts of shares underwritten or purchased by each of them;

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the purchase price of the securities;

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any delayed delivery arrangements;

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any underwriting discounts and other items constituting underwriter compensation;

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any initial public offering price; and

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any discounts or concessions allowed or reallowed or paid to dealers.

We may offer our common stock to the public through underwriting syndicates represented by managing underwriters or through underwriters without an underwriting syndicate. If underwriters are used for the sale of our common stock, the securities will be acquired by the underwriters for their own account. In connection with any such underwritten sale of common stock, underwriters may receive compensation from us, for whom they may act as agents, in the form of discounts, concessions or commissions. Underwriters may sell common stock to or through dealers, and the dealers may receive compensation in the form of discounts, concessions or commissions from the underwriters and/or commissions from the purchasers for whom they may act as agents. Such compensation may be in excess of customary discounts, concessions or commissions. Any offering price and any discounts, concessions or commissions may be changed from time to time.

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If we use an underwriter or underwriters to effectuate the sale of shares of our common stock, we and they will execute an underwriting agreement with those underwriters at the time of sale of those securities. To the extent required by law, the names of the underwriters will be set forth in the prospectus supplement used by the underwriters to sell those securities. Unless otherwise indicated in the prospectus supplement relating to a particular offering of common stock, the obligations of the underwriters to purchase the securities will be subject to customary conditions precedent, and the underwriters will be obligated to purchase all of the securities offered if any of the securities are purchased.

In effecting sales, brokers or dealers engaged by us may arrange for other brokers or dealers to participate. Broker-dealers may receive discounts, concessions or commissions from us (or, if any broker-dealer acts as agent for the purchaser of shares, from the purchaser) in amounts to be negotiated. Such compensation may be in excess of customary discounts, concessions or commissions. If dealers are utilized in the sale of securities, the names of the dealers and the terms of the transaction will be set forth in a prospectus supplement, if required.

We may also sell shares of our common stock from time to time through agents. We will name any agent involved in the offer or sale of such shares and will list commissions payable to these agents in a prospectus supplement, if required. These agents will be acting on a best efforts basis to solicit purchases for the period of their appointment, unless we state otherwise in any required prospectus supplement.

We may sell shares of our common stock directly to purchasers. In this case, it may not engage underwriters or agents in the offer and sale of such shares.

Any underwriters, broker-dealers or agents that participate in the sale of our shares of common stock or interests therein may be “underwriters” within the meaning of the Securities Act. Any discounts, commissions, concessions or profit they earn on any resale of the shares may be underwriting discounts and commissions under the Securities Act. If any entity is deemed an underwriter or any amounts deemed underwriting discounts and commissions, the prospectus supplement will identify the underwriter or agent and describe the compensation received from us.

Certain of the underwriters, broker-dealers or agents who may become involved in the sale of the shares of common stock may engage in transactions with and perform other services for us in the ordinary course of their business for which they will receive ordinary compensation.

Indemnification

We may enter agreements under which underwriters, dealers and agents who participate in the distribution of our common stock may be entitled to indemnification by us against various liabilities, including liabilities under the Securities Act, and to contribution with respect to payments which the underwriters, dealers or agents may be required to make.

Price Stabilization and Short Positions

If underwriters or dealers are used in the sale of shares of our common stock, until the distribution of the shares is completed, rules of the SEC may limit the ability of any underwriters to bid for and purchase our common stock. As an exception to these rules, representatives of any underwriters are permitted to engage in transactions that stabilize the price of our common stock. These transactions may consist of bids or purchases for the purpose of pegging, fixing or maintaining the price of our common stock. If the underwriters create a short position in shares of our common stock in connection with an offering (that is, if they sell more shares than are set forth on the cover page of the applicable prospectus supplement), the representatives of the underwriters may reduce that short position by purchasing shares in the open market.

We make no representation or prediction as to the direction or magnitude of any effect that the transactions described above may have on the price of our common stock. In addition, we make no representation that the representatives of any underwriters will engage in these transactions or that these transactions, once commenced, will not be discontinued without notice.

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VALIDITY OF COMMON STOCK

The validity of the common stock offered by this prospectus will be passed upon for us by King & Spalding LLP, Atlanta, Georgia. Certain legal matters with respect to the common stock may be passed upon by counsel for any underwriters, dealers or agents, each of whom will be named in the related prospectus supplement.

EXPERTS

The consolidated financial statements and the related financial statement schedule incorporated by reference in this prospectus and the effectiveness of SiteOne Landscape Supply Inc.’s internal control over financial reporting have been audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in their reports, which are incorporated by reference herein. Such consolidated financial statements and financial statement schedule are incorporated by reference in reliance upon the report of such firm given upon their authority as experts in accounting and auditing.

WHERE YOU CAN FIND MORE INFORMATION

This prospectus and any accompanying prospectus supplement are part of a registration statement that we filed with the SEC and do not contain all the information set forth in the registration statement and the exhibits thereto. Some items are omitted in accordance with the rules and regulations of the SEC. For further information with respect to us and the common stock offered hereby, we refer you to the registration statement and the exhibits filed therewith. Statements contained in this prospectus, any accompanying prospectus supplement and the documents incorporated or deemed to be incorporated by reference herein or therein as to the contents of any contract, agreement or any other document referred to are summaries of the material terms of the respective contract, agreement or other document. With respect to each of these contracts, agreements or other documents filed as an exhibit to the registration statement or the documents incorporated or deemed to be incorporated by reference into this prospectus or any accompanying prospectus supplement, reference is made to the exhibits for a more complete description of the matter involved.

We are subject to the informational requirements of the Exchange Act and, accordingly, file annual reports containing financial statements audited by an independent registered public accounting firm, quarterly reports containing unaudited financial statements, current reports, proxy statements and other information with the SEC. You may inspect the materials without charge at the SEC’s website.

You may access, free of charge, our reports filed with the SEC (for example, our Annual Reports on Form 10-K, our Quarterly Reports on Form 10-Q and our Current Reports on Form 8-K and any amendments to those forms) through our website (http://investors.siteone.com). Reports filed with or furnished to the SEC will be available as soon as reasonably practicable after they are filed with or furnished to the SEC. None of the information contained on, or that may be accessed through, our websites or any other website identified herein is part of, or incorporated into, this prospectus. All website addresses in this prospectus are intended to be inactive textual references only.

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INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

The SEC allows us to “incorporate by reference” into this prospectus information we file with the SEC in other documents. This means that we can disclose important information to you by referring to another document we have filed with the SEC. The information relating to us contained in this prospectus should be read together with the information in the documents incorporated or deemed to be incorporated by reference.

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our Annual Report on Form 10-K for the year ended December 29, 2019, filed with the SEC on February 26, 2020 (SEC File No. 001-37760);

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the subsection “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations — Results of Operations — Comparison of the 2018 Fiscal Year to the 2017 Fiscal Year” included in of our Annual Report on Form 10-K for the year ended December 31, 2018, filed with the SEC on February 27, 2019 (SEC File No. 001-37760);

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our Current Reports on Form 8-K filed with the SEC on February 12, 2020, April 1, 2020 (but only with respect to Item 2.03), May 15, 2020 and July 27, 2020;

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You should read the information relating to us in this prospectus and any accompanying prospectus supplement together with the information in the documents incorporated or deemed to be incorporated by reference herein. Nothing contained herein shall be deemed to incorporate information furnished to, but not filed with, the SEC.

Any statement incorporated by reference in this prospectus from an earlier dated document that is inconsistent with a statement contained in this prospectus or in any other document filed after the date of the earlier dated document, but prior to the date hereof, which also is incorporated by reference in this prospectus, shall be deemed to be modified or superseded for purposes of this prospectus by such statement contained in this prospectus or in any other document filed after the date of the earlier dated document, but prior to the date hereof, which also is incorporated by reference in this prospectus.

Any person, including any beneficial owner, to whom this prospectus is delivered may request copies of any of the documents incorporated or deemed to be incorporated by reference in this prospectus, without charge, by written or oral request directed to SiteOne Landscape Supply, Inc., c/o Briley Brisendine, Secretary, 300 Colonial Center Parkway, Roswell, Georgia 30076, Telephone: (470) 277-7000 or the Investor Relations portion of our website at http://investors.siteone.com or from the SEC through the SEC’s Internet website at the address provided under “Where You Can Find More Information.” All other information contained on our website is not a part of this prospectus. Documents incorporated or deemed to be incorporated by reference in this prospectus are available without charge, excluding any exhibits to those documents unless the exhibit is specifically incorporated by reference into those documents.