SST Reports Second Quarter 2005 Financial Results
Company Announces Executive and Board Level Changes

SUNNYVALE, Calif., Apr. 21, 2005 -- SST (Silicon Storage Technology, Inc.) (NASDAQ: SSTI), a leader in flash memory technology, today announced financial results for the first quarter ended March 31, 2005.

Net revenues for the first quarter were $86.3 million, compared with $104.1 million in the fourth quarter of 2004 and with $104.4 million in the first quarter a year ago.

Net loss for the first quarter of 2005 was $13.9 million, or a loss of $0.14 per share, based on approximately 97.8 million diluted shares outstanding. This includes a $9.7 million inventory adjustment, primarily due to a decline in the pricing of several of SST's products. By comparison, the company recorded a net loss of $26.9 million, or a loss of $0.28 per share on approximately 96.2 million diluted shares outstanding in the fourth quarter of 2004. Net loss in the fourth quarter of 2004 included a $20.5 million inventory adjustment. For the first quarter of 2004, the company reported a net income of $14.2 million, or $0.14 per share on approximately 100.3 million diluted shares outstanding.

SST finished the first quarter 2005 with $75.2 million in cash, cash equivalents and short-term investments.

On April 18, 2005, Terry M. Nickerson was appointed to the Board of Directors, and the Audit Committee, the Compensation Committee and the Nominating and Corporate Governance Committee of the Board of Directors.  Nickerson replaces Yasushi Chikagami on the Audit Committee and will assume chairmanship of the Audit Committee following SST's 2005 Annual Meeting of Shareholders and is an audit committee financial expert, as such term is defined by the rules and regulations of the Securities and Exchange Commission.

Also on April 18, 2005, the Board of Directors determined to commence an executive search for a new chief financial officer. Jack K. Lai will continue to serve as SST's chief financial officer until his successor is retained, at which time SST expects that Lai will transition to a different role within the company.

These actions are part of a broader effort to, among other things, strengthen the Audit Committee and SST's financial organization, including controls over sales of SST's common stock by officers and directors.

"The difficult market environment that we began to see in the third quarter of 2004 continued through the first quarter of 2005," said Bing Yeh, president and CEO. "Unit shipments were lower than expected in the wireless communications and Internet computing segments, primarily caused by industry oversupply. In particular, shipments to the smart card IC market decreased by 42 percent after achieving record shipments in the prior quarter.

"Furthermore, the continued competitive pricing environment resulted in a 9.8 percent drop in selling prices in the first quarter. The intensified competition has created severe price erosion of our 4M, 8M and 16Mbit products. While we do not believe the current pricing environment is sustainable long-term, we believe that we will not see significant improvement in memory pricing until the latter part of 2005. However, due to the expected shipment ramp of our serial flash products, certain non-memory products and specialty memory products in the second half of this year, we expect our results to improve after the second quarter.

"For our memory products, we are continuing to drive manufacturing cost reductions through the transition to smaller geometries. Substantially all new wafer starts are now in 0.25 micron and 0.18 micron geometries. We are in the process of intensively developing 0.13 micron and 0.12 micron process technologies. While our near term gross margin is expected to be mainly impacted by our inventory and price erosion, we believe our cost reduction efforts will position us for the expected industry upturn.

"For our non-memory business, we are continuing to aggressively introduce new products, including flash microcontrollers, smart card ICs and RF IC products. Our ATA controller product with embedded flash is being designed into high volume applications. Another flash controller product is in the early stage of sampling for notebook PC applications. Our smart card ICs are expanding their presence outside the China market, including India and Europe. We expect revenue from our non-memory business, which was $11.4 million or 14.2 percent in the first quarter, to be more than $50 million in the second half of 2005. Also, recently, we purchased the remaining 16.4 percent minority interest of Emosyn, previously held by ATMI. This will allow us to more effectively integrate Emosyn into our business and improve the efficiency of our operations. We believe that our embedded flash memory business holds strong potential in the coming years. It is an important part of our ongoing strategy to diversify our revenue and to selectively enter emerging markets where our technology and our lower cost manufacturing capabilities give us distinct advantages over our competition.

"While we believe that the current difficult pricing environment may continue into the second half of 2005, we expect that demand will improve moderately in the second quarter, primarily driven by a rebound in the wireless communications market and strengthening in the PC and digital consumer markets. Furthermore, with increased shipments of non-memory products and continued lowering of our manufacturing costs, we believe we can position ourselves for returned growth in the second half and beyond."

SST expects its second quarter unit shipments to increase slightly from the first quarter. In addition, the company expects average selling prices to decline by four to six percent. Licensing revenue is expected to be down slightly from the prior quarter. Therefore, SST expects its second quarter revenues to be between $80 million and $90 million, assuming no drastic changes occur in the U.S. and international economies. Gross margin is expected to be between 11 and 15 percent, which takes into consideration the risks associated with market condition changes. Research and development spending is expected to be approximately 10 percent higher than the prior quarter. In addition, the company expects a $4 to $5 million charge as a result of the Actrans acquisition. With these revenue and expense levels, SST expects net loss per share to be between $0.20 and $0.28 in the second quarter.

SST will hold a conference call to discuss its financial results today at 1:30 p.m. PDT.  Those wishing to participate in the conference should dial (800) 230-1951 using the password "SST" at approximately 1:20 p.m. PDT.  A replay of the call will be available for two weeks by dialing (800) 475-6701 using the access code 776493.  A webcast of the conference call will be available until the next earnings conference call on the company's Web site at http://www.sst.com/events.

SST's SuperFlash technology is a NOR type, split-gate cell architecture that uses a reliable thick-oxide process with fewer manufacturing steps resulting in a low-cost, nonvolatile memory solution with excellent data retention and higher reliability. The split-gate NOR SuperFlash architecture facilitates a simple and flexible design suitable for high performance, high reliability, small or medium sector size, in- or off-system programming and a variety of densities, all in a single CMOS-compatible technology.

Headquartered in Sunnyvale, California, SST designs, manufactures and markets a diversified range of nonvolatile memory solutions, based on proprietary, patented SuperFlash technology, for high volume applications in the digital consumer, networking, wireless communications and Internet computing markets. SST's product families include various densities of high functionality flash memory components, flash mass storage products and flash microcontrollers. SST also offers its SuperFlash technology for embedded applications through its world-class manufacturing partners and technology licensees including 1^st Silicon (Malaysia) Sdn. Bhd., Freescale Semiconductor, Inc., Grace Semiconductor Manufacturing Corporation (Grace), IBM, National Semiconductor Corporation, NEC Corporation, Oki Electric Industry Co. Ltd., Powerchip Semiconductor Corp., Samsung Electronics Co. Ltd., SANYO Electric Co., Ltd., Seiko Epson Corp., Shanghai Hua Hong NEC Electronics Co., Ltd., Taiwan Semiconductor Manufacturing Co. Ltd. (TSMC), Toshiba Corporation, Vanguard International Semiconductor Corporation and Winbond Electronics Corp. TSMC offers embedded SuperFlash under its trademark Emb-FLASH. Further information on SST can be found on the company's Web site at http://www.sst.com.

Except for the historical information contained herein, this news release contains forward-looking statements regarding market conditions for flash memory products, and other non-flash memory products, such as RF ICs, flash microcontrollers, and smart cards, the company's future financial performance, the performance of new products and the company's ability to bring new products to market that involve risks and uncertainties. These risks may include timely development, acceptance and pricing of new products, the terms and conditions associated with licensees' royalty payments, the impact of competitive products and pricing, and general economic conditions as they affect the company's customers, as well as other risks detailed from time to time in the company's SEC reports, including the Annual Report on Form 10-K for the year ended December 31, 2004.

                                                                                              
                                                     Three Months Ended
                                                         March 31,
                                                    --------------------
                                                      2004       2005
                                                    ---------  ---------
                                                         (unaudited)                            
Net revenues:
     Product revenues............................. $  91,370  $  79,270
     Technology licensing.........................    13,063      7,045
                                                    ---------  ---------
          Total net revenues......................   104,433     86,315
Cost of revenues..................................    66,282     73,722
                                                    ---------  ---------
Gross profit......................................    38,151     12,593
                                                    ---------  ---------
Operating expenses:
     Research and development.....................    11,803     11,965
     Sales and marketing..........................     6,928      7,340
     General and administrative...................     3,999      6,702
                                                    ---------  ---------
          Total operating expenses................    22,730     26,007
                                                    ---------  ---------
Income (loss) from operations.....................    15,421    (13,414)
Interest and other income.........................       394        327
Interest and other expense........................       (54)      (147)
Impairment of equity investments..................        --         --
                                                    ---------  ---------
Income (loss) before provision for
   income taxes...................................    15,761    (13,234)
Provision for income taxes........................     1,528        747
Minority interest.................................        --        (84)
                                                    ---------  ---------
Net income (loss)................................. $  14,233  $ (13,897)
                                                    =========  =========

Net income (loss) per share - basic .............. $    0.15  $   (0.14)
                                                    =========  =========

Shares used in per share calculation - basic .....    95,821     97,820
                                                    =========  =========

Net income (loss) per share - diluted ............ $    0.14  $   (0.14)
                                                    =========  =========

Shares used in per share calculation - diluted....   100,258     97,820
                                                    =========  =========

                                                                                   
                                                         December 31,   March 31,
                                                             2004          2005
                                                         ------------  ------------
                                                         (unaudited)   (unaudited)
                        ASSETS                                                     
Current assets:
    Cash, cash equivalents and short-term investments.. $    103,993  $     75,216
    Trade accounts receivable, net.....................       58,179        45,790
    Inventories........................................      156,618       176,194
    Other current assets...............................       16,049        14,521
                                                         ------------  ------------
         Total current assets..........................      334,839       311,721
Equipment, furniture and fixtures, net.................       16,620        16,132
Long-term marketable securities........................       23,094        27,092
Other assets...........................................      112,178       111,473
Goodwill...............................................       15,600        15,600
                                                         ------------  ------------
         Total assets.................................. $    502,331  $    482,018
                                                         ============  ============
                                                                                   
                      LIABILITIES                                                  
Current liabilities:
    Notes payable, current portion..................... $        705  $        372
    Trade accounts payable.............................       89,155        84,297
    Accrued expenses and other liabilities.............       30,593        23,023
    Deferred revenue...................................        2,388         2,566
                                                         ------------  ------------
         Total current liabilities.....................      122,841       110,258
Other liabilities......................................        1,307         1,958
Minority interest......................................        2,199         2,115
                                                         ------------  ------------
         Total liabilities.............................      126,347       114,331
                                                         ------------  ------------
                                                                                   
                 SHAREHOLDERS' EQUITY                                              
Common stock...........................................      358,578       360,303
Accumulated other comprehensive income.................       16,542        20,416
Retained earnings......................................          864       (13,032)
                                                         ------------  ------------
         Total shareholders' equity....................      375,984       367,687
                                                         ------------  ------------
         Total liabilities and shareholders' equity.... $    502,331  $    482,018
                                                         ============  ============