SILICON STORAGE TECHNOLOGY INC
S-3/A, 2000-10-03
SEMICONDUCTORS & RELATED DEVICES
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<PAGE>

    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON OCTOBER 3, 2000


                                                      REGISTRATION NO. 333-47042

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                           --------------------------


                                AMENDMENT NO. 1
                                       TO
                                    FORM S-3
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933

                           --------------------------

                        SILICON STORAGE TECHNOLOGY, INC.
             (Exact name of Registrant as specified in its charter)

<TABLE>
<S>                                          <C>
                CALIFORNIA                                   77-0225590
      (State or Other Jurisdiction of                     (I.R.S. Employer
      Incorporation or Organization)                   Identification Number)
</TABLE>

                               1171 SONORA COURT
                          SUNNYVALE, CALIFORNIA 94086
                                 (408) 735-9110
    (Address, including zip code, and telephone number, including area code,
                  of Registrant's principal executive offices)

                                    BING YEH
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                        SILICON STORAGE TECHNOLOGY, INC.
                               1171 SONORA COURT
                          SUNNYVALE, CALIFORNIA 94086
                                 (408) 735-9110
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)

                                   COPIES TO:

<TABLE>
<S>                                         <C>
          MARK P. TANOURY, ESQ.                       WILLIAM M. KELLY, ESQ.
         MATTHEW W. SONSINI, ESQ.                     DAVIS POLK & WARDWELL
            COOLEY GODWARD LLP                         1600 EL CAMINO REAL
          FIVE PALO ALTO SQUARE                    MENLO PARK, CALIFORNIA 94025
           3000 EL CAMINO REAL                            (650) 752-2000
       PALO ALTO, CALIFORNIA 94306
              (650) 843-5000
</TABLE>

          APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO PUBLIC:
As soon as practicable after the effective date of this Registration Statement.
                           --------------------------

    If the only securities being registered on this form are being offered
pursuant to a dividend or interest reinvestment plans, please check the
following box.  / /

    If any of the securities being registered on this form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, as amended, other than securities offered only in connection with dividend
or interest reinvestment plans, check the following box.  / /

    If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  / /

    If this form is to be a post-effective amendment filed pursuant to
Rule 462(c) under the Securities Act, check the following box and list the
Securities Act registration statement of the earlier effective registration
statement for the same offering.  / /


    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  / /


    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE SECURITIES AND EXCHANGE COMMISSION, ACTING
PURSUANT TO SECTION 8(a), MAY DETERMINE.

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

                  SUBJECT TO COMPLETION, DATED OCTOBER 3, 2000


                                  $150,000,000

                                   [SST LOGO]

           % Convertible Subordinated Notes due                , 2005

                                  -----------

    We will pay interest on the notes each       and       , beginning on
             , 2001. Holders may require us to repurchase the notes upon a
change in control. The notes are subordinated to our senior indebtedness and
effectively subordinated to all indebtedness and other liabilities of our
subsidiaries.


    Holders may convert the notes into our common stock at any time prior to
maturity at a conversion price of $    per share, which is equivalent to a
conversion rate of       shares of our common stock per $1,000 principal amount
of notes. Our common stock is listed on The Nasdaq Stock Market's National
Market under the symbol "SSTI." On October 2, 2000, the last reported sale price
for our common stock was $25.1875 per share.


    We may redeem some or all of the notes at any time before              ,
2003, at a redemption price of $1,000 per $1,000 principal amount of notes, plus
accrued and unpaid interest, if any, to but excluding the redemption date, if
certain conditions are met. We will make an additional payment in cash with
respect to the notes called for provisional redemption in an amount equal to
$    per $1,000 principal amount of notes, less the amount of any interest
actually paid on the notes before the date of redemption. We may redeem some or
all of the notes at any time on or after              , 2003, at the redemption
prices described in this prospectus.

    The underwriters have an option to purchase a maximum of $22,500,000
additional principal amount of notes to cover over-allotments of notes.

    Concurrently with this offering and pursuant to a separate prospectus, we
are selling 5,000,000 shares of our common stock, 5,750,000 shares if the
underwriters' over-allotment option is exercised in full. This offering of the
notes is not conditioned on completion of the common stock offering.

    INVESTING IN THE NOTES AND OUR COMMON STOCK INVOLVES RISKS. SEE "RISK
FACTORS" ON PAGE 8.

<TABLE>
<CAPTION>
                                                                                  UNDERWRITING
                                                             PRICE TO             DISCOUNTS AND            PROCEEDS
                                                             PUBLIC(1)             COMMISSIONS             TO SST(1)
                                                       ---------------------  ---------------------  ---------------------
<S>                                                    <C>                    <C>                    <C>
Per Note.............................................            %                      %                      %
Total................................................            $                      $                      $
</TABLE>

(1) Plus accrued interest, if any, from             , 2000.

    Delivery of the notes in book-entry form will be made on or about
             , 2000.

    Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if this
prospectus is truthful or complete. Any representation to the contrary is a
criminal offense.

CREDIT SUISSE FIRST BOSTON


                                  LEHMAN BROTHERS


                                                             CHASE H&Q

               The date of this prospectus is              , 2000
<PAGE>
                                 --------------

                               TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                          PAGE
                                        --------
<S>                                     <C>
PROSPECTUS SUMMARY....................      3
RISK FACTORS..........................      8
USE OF PROCEEDS.......................     19
CAPITALIZATION........................     20
SELECTED CONSOLIDATED FINANCIAL
  DATA................................     21
DESCRIPTION OF THE NOTES..............     23
CERTAIN UNITED STATES FEDERAL INCOME
  TAX CONSIDERATIONS..................     37
UNDERWRITING..........................     44
</TABLE>



<TABLE>
<CAPTION>
                                          PAGE
                                        --------
<S>                                     <C>
NOTICE TO CANADIAN RESIDENTS..........     47
LEGAL MATTERS.........................     48
EXPERTS...............................     48
WHERE YOU CAN FIND MORE INFORMATION...     48
INFORMATION INCORPORATED BY
  REFERENCE...........................     49
DISCLOSURE REGARDING FORWARD-LOOKING
  STATEMENTS..........................     50
</TABLE>


                                 --------------

    YOU SHOULD RELY ONLY ON INFORMATION CONTAINED IN THIS DOCUMENT OR TO WHICH
WE HAVE REFERRED YOU. WE HAVE NOT AUTHORIZED ANYONE TO PROVIDE YOU WITH
INFORMATION THAT IS DIFFERENT. THIS DOCUMENT MAY ONLY BE USED WHERE IT IS LEGAL
TO SELL THESE SECURITIES. THE INFORMATION IN THIS DOCUMENT MAY ONLY BE ACCURATE
ON THE DATE OF THIS DOCUMENT.
<PAGE>
                               PROSPECTUS SUMMARY

    YOU SHOULD READ THE FOLLOWING SUMMARY TOGETHER WITH THE MORE DETAILED
INFORMATION IN THIS PROSPECTUS CONCERNING US AND THE CONVERTIBLE SUBORDINATED
NOTES BEING SOLD IN THIS OFFERING AND THE DOCUMENTS INCORPORATED BY REFERENCE IN
THIS PROSPECTUS. UNLESS THE CONTEXT REQUIRES OTHERWISE, REFERENCES IN THIS
PROSPECTUS TO "WE," "US," "OUR" AND "SST" REFER TO SILICON STORAGE
TECHNOLOGY, INC. AND OUR WHOLLY OWNED SUBSIDIARIES.

                        SILICON STORAGE TECHNOLOGY, INC.

    We are a leading supplier of flash memory semiconductor devices for the
digital consumer, networking, wireless communication and Internet computing
markets. Flash memory is nonvolatile memory that does not lose data when the
power source is removed and is capable of electrically erasing selected blocks
of data. We believe our proprietary flash memory technology, SuperFlash, offers
superior performance to other flash memory solutions. We have three standard
flash memory product families: the small-sector flash family, the multi-purpose
flash family and the many-time programmable flash family. These families allow
us to produce products optimized for cost and functionality to support a broad
range of applications that use nonvolatile memory products. We believe the
benefits of SuperFlash include high reliability, fast write performance, ability
to be scaled to a smaller size and a low-cost manufacturing process.

    We offer over 50 products based on our SuperFlash design and manufacturing
process technology. These products include flash memory products, application
specific memory products, flash embedded controllers and mass storage products.
Our memory devices have densities ranging from 256 Kbit to 16 Mbit and are
generally used for the storage of program code. Our flash embedded
microcontrollers support concurrent flash read-while-write operations using
In-Application Programming. We also offer mass storage products that are used
for storing images, music and other data in devices such as digital cameras and
MP3 players.

    Our customers include Acer, Apple, Arima, Asustek, Compal, Cisco, Compaq,
Diamond Multimedia, FIC, Gigabyte, Hyundai, Infineon, Intel, IBM, Inventec, LG,
Liteon, Lucent, Motorola, Nortel, Panasonic, Quanta, Samsung, Sanyo, Sony and
3Com. We also license our SuperFlash technology to leading semiconductor
companies including Analog Devices, ATMI, IBM, ISD, Motorola, National
Semiconductor, Samsung, Sanyo, Seiko-Epson and TSMC to embed in semiconductor
devices that integrate flash memory with other functions on a single chip. Our
products are manufactured at leading wafer foundries and semiconductor
manufacturers including Samsung Electronics, Sanyo, Seiko-Epson, TSMC and UMC.
We also work with IBM, Samsung Electronics, Sanyo, Seiko-Epson and TSMC to
develop new technology for manufacturing our products.

    Our objective is to be the leading worldwide supplier of flash memory
devices and intellectual property for program code storage applications. In
addition, we intend to leverage our SuperFlash technology to penetrate the high
density mass storage markets. We intend to achieve our objectives by:

    - maintaining a leading position in the program code storage market;

    - continuing to enhance our leading flash memory technology;

    - introducing new products based on our SuperFlash technology;

    - maintaining a leading position in licensing embedded flash technology; and

    - penetrating the high density mass storage market.

    We were incorporated in 1989 in California. Our principal executive offices
are located at 1171 Sonora Court, Santa Clara, CA 94086, and our telephone
number is (408) 735-9110.

                                       3
<PAGE>
    "SuperFlash" and the SST logo are our registered trademarks and
In-Application Programming, SSF, MPF and MTP are our trademarks. This prospectus
also includes trademarks owned by other parties.

                                  THE OFFERING

<TABLE>
<S>                                                          <C>
Securities Offered.........................................  $150,000,000 aggregate principal amount of
                                                               % Convertible Subordinated Notes due
                                                                         , 2005. We have also granted
                                                             the underwriters an option to purchase up
                                                             to $22,500,000 aggregate principal amount
                                                             of additional notes, solely to cover
                                                             over-allotments, if any.
Offering Price.............................................  % of the principal amount of the notes,
                                                             plus accrued interest on the notes, if
                                                             any.
Interest...................................................  The notes will bear interest at an annual
                                                             rate of       %, compounded semi-annually.
                                                             Interest will be payable on each      and
                                                                   , beginning             , 2001.
Maturity Date..............................................  , 2005.
Conversion Rights..........................................  The notes are convertible at the option of
                                                             the holder at any time prior to maturity
                                                             into shares of our common stock initially
                                                             at a conversion price of $
                                                             per share, which is equal to a conversion
                                                             rate of         shares per $1,000
                                                             principal amount of notes. The conversion
                                                             rate is subject to adjustment.
Provisional Redemption.....................................  We may redeem the notes, in whole or in
                                                             part, at any time prior to             ,
                                                             2003, at a redemption price equal to
                                                             $1,000 per $1,000 principal amount of
                                                             notes to be redeemed, plus accrued and
                                                             unpaid interest, if any, to but excluding
                                                             the redemption date, if the closing price
                                                             of our common stock has exceeded 150% of
                                                             the conversion price then in effect for at
                                                             least 20 trading days within a period of
                                                             30 consecutive trading days ending on the
                                                             trading day before the date of mailing of
                                                             the redemption notice. Upon any
                                                             provisional redemption, we will make an
                                                             additional payment in cash with respect to
                                                             the notes called for provisional
                                                             redemption in an amount equal to
                                                             $      per $1,000 principal amount of
                                                             notes, less the amount of any interest
                                                             actually paid on the notes before the call
                                                             for provisional redemption. WE WILL BE
                                                             OBLIGATED TO MAKE THIS ADDITIONAL PAYMENT
                                                             ON ALL NOTES CALLED FOR PROVISIONAL
                                                             REDEMPTION, INCLUDING ANY NOTES CONVERTED
                                                             AFTER THE NOTICE DATE AND BEFORE THE
                                                             REDEMPTION DATE.
</TABLE>

                                       4
<PAGE>

<TABLE>
<S>                                                          <C>
Optional Redemption........................................  We may redeem the notes on or after
                                                                         , 2003, at the redemption
                                                             prices, plus accrued and unpaid interest,
                                                             set forth in this prospectus.
Sinking Fund...............................................  None.
Change in Control..........................................  Upon a change in control, you may require
                                                             us to purchase your notes at 100% of the
                                                             principal amount of the notes, plus
                                                             accrued and unpaid interest. We may not
                                                             have sufficient funds to pay the purchase
                                                             price for all duly tendered notes upon a
                                                             change in control.
Subordination..............................................  The notes will be general, unsecured
                                                             obligations of SST, subordinated in right
                                                             of payment to all existing and future
                                                             senior indebtedness. In addition, the
                                                             notes will be effectively subordinated to
                                                             the indebtedness and other liabilities of
                                                             our subsidiaries. As of August 31, 2000,
                                                             we had no senior indebtedness outstanding
                                                             and our subsidiaries had approximately
                                                             $3,400 of outstanding liabilities which
                                                             consisted of accounts payable and other
                                                             liabilities. We and our subsidiaries are
                                                             not prohibited from incurring senior
                                                             indebtedness or other debt under the
                                                             indenture.
Use of Proceeds............................................  Working capital, general corporate
                                                             purposes, possible acquisitions of
                                                             businesses or technologies and possible
                                                             production capacity commitments. See "Use
                                                             of Proceeds."
Trading....................................................  We do not intend to list the notes for
                                                             trading on any national securities
                                                             exchange or for inclusion in any automated
                                                             quotation system.
Trustee....................................................  Bank One Trust Company, N.A.
Common Stock Offering......................................  Under a separate prospectus we are
                                                             offering concurrently with this offering,
                                                             5,000,000 shares of our common stock,
                                                             5,750,000 shares if the underwriters'
                                                             over-allotment option is exercised in
                                                             full. Completion of the common stock
                                                             offering is not a condition to this
                                                             offering.
</TABLE>

    Except as otherwise noted, all information in this prospectus assumes the
underwriters' over- allotment option is not exercised.

                                       5
<PAGE>
                      SUMMARY CONSOLIDATED FINANCIAL DATA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                                                            SIX MONTHS ENDED
                                                  YEAR ENDED DECEMBER 31,                       JUNE 30,
                                    ----------------------------------------------------   -------------------
                                      1995       1996       1997       1998       1999       1999       2000
                                    --------   --------   --------   --------   --------   --------   --------
<S>                                 <C>        <C>        <C>        <C>        <C>        <C>        <C>
CONSOLIDATED STATEMENTS OF
  OPERATIONS DATA:
Net revenues:
  Product revenues................  $38,283    $90,638    $73,796    $ 66,875   $118,242   $ 38,226   $163,889
  License revenues................    1,245      2,652      1,526       2,536      6,552      3,093      1,611
                                    -------    -------    -------    --------   --------   --------   --------
    Total net revenues............   39,528     93,290     75,322      69,411    124,794     41,319    165,500
Cost of revenues..................   26,360     59,494     62,747      62,703     94,652     35,004     93,559
                                    -------    -------    -------    --------   --------   --------   --------
Gross profit......................   13,168     33,796     12,575       6,708     30,142      6,315     71,941
                                    -------    -------    -------    --------   --------   --------   --------
Operating expenses:
  Research and development........    4,058      6,948      8,744      14,527     18,199      9,213     17,257
  Sales and marketing.............    2,455      5,292      6,587       7,290     10,576      4,465     10,503
  General and administrative......    1,464      3,370      9,479       4,592      3,800      1,245      6,319
  In-process research and
    development...................       --         --         --          --      2,011      2,011         --
                                    -------    -------    -------    --------   --------   --------   --------
    Total operating expenses......    7,977     15,610     24,810      26,409     34,586     16,934     34,079
                                    -------    -------    -------    --------   --------   --------   --------
Income (loss) from operations.....    5,191     18,186    (12,235)    (19,701)    (4,444)   (10,619)    37,862
Interest and other income, net....      517      1,763      2,146       1,573        730        513      3,100
Interest expense..................     (273)        --         --         (31)      (214)       (36)      (545)
                                    -------    -------    -------    --------   --------   --------   --------
Income (loss) before provision for
  (benefit from) income taxes.....    5,435     19,949    (10,089)    (18,159)    (3,928)   (10,142)    40,417
Provision for (benefit from)
  income taxes....................     (594)     7,598     (3,165)       (571)        88         65      8,237
                                    -------    -------    -------    --------   --------   --------   --------
Net income (loss).................  $ 6,029    $12,351    $(6,924)   $(17,588)  $ (4,016)  $(10,207)  $ 32,180
                                    =======    =======    =======    ========   ========   ========   ========
Net income (loss) per
  share--basic....................  $  0.23    $  0.18    $ (0.10)   $  (0.26)  $  (0.06)  $  (0.15)  $   0.39
                                    =======    =======    =======    ========   ========   ========   ========
Net income (loss) per
  share--diluted..................  $  0.11    $  0.16    $ (0.10)   $  (0.26)  $  (0.06)  $  (0.15)  $   0.36
                                    =======    =======    =======    ========   ========   ========   ========
</TABLE>


<TABLE>
<CAPTION>
                                                                         JUNE 30, 2000
                                                              -----------------------------------
                                                                                       AS FURTHER
                                                               ACTUAL    AS ADJUSTED    ADJUSTED
                                                              --------   -----------   ----------
<S>                                                           <C>        <C>           <C>
CONSOLIDATED BALANCE SHEET DATA:
Cash and cash equivalents...................................  $170,632     $315,122     $434,358
Working capital.............................................   278,740      423,230      542,466
Total assets................................................   399,569      544,059      663,295
Long-term obligations.......................................       364      144,854      145,314
Total shareholders' equity..................................  $337,649     $337,649     $456,425
</TABLE>


    The as adjusted balance sheet data gives effect to the net proceeds from the
sale of $150 million principal amount of convertible subordinated notes offered
in this offering after deducting estimated underwriting discounts and
commissions and estimated offering expenses. See "Use of Proceeds."


    The as further adjusted balance sheet data gives effect to the net proceeds
from the sale of $150 million principal amount of convertible subordinated notes
offered in this offering and the net proceeds from the sale of 5,000,000 shares
of common stock offered in the concurrent common stock offering at an assumed
public offering price of $25.1875 per share, in each case, after deducting
estimated underwriting discounts and commissions and estimated offering
expenses. Completion of the common stock offering is not a condition to this
offering. See "Capitalization."


    The above data has been retroactively adjusted, as appropriate, to reflect a
3-for-1 stock split which was effected in August 2000.

                                       6
<PAGE>
                     QUARTERLY CONSOLIDATED FINANCIAL DATA

    The following table presents our unaudited consolidated statements of
operations data for each of the eight quarters in the period ended June 30,
2000. In our opinion:

    - this information has been presented on the same basis as the audited
      consolidated financial statements incorporated by reference in this
      prospectus, except that the net income (loss) per share data has been
      retroactively adjusted, as appropriate, to reflect a 3-for-1 stock split
      which was effected in August 2000; and

    - all necessary adjustments, consisting only of normal recurring
      adjustments, have been included in the amounts stated below to present
      fairly the unaudited quarterly results when read in conjunction with the
      audited consolidated financial statements and related notes.

    The operating results for any quarter should not be relied upon as
necessarily indicative of results for any future period. We expect our quarterly
operating results to fluctuate in future periods due to a variety of reasons,
including those discussed in "Risk Factors."

<TABLE>
<CAPTION>
                                                                        QUARTER ENDED
                                   ---------------------------------------------------------------------------------------
                                   SEPT. 30,   DEC. 31,   MAR. 31,   JUNE 30,   SEPT. 30,   DEC. 31,   MAR. 31,   JUNE 30,
                                     1998        1998       1999       1999       1999        1999       2000       2000
                                   ---------   --------   --------   --------   ---------   --------   --------   --------
                                                            (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                <C>         <C>        <C>        <C>        <C>         <C>        <C>        <C>
Net revenues:
  Product revenues...............   $17,333    $17,366    $17,793    $20,433     $32,508    $47,508    $61,813    $102,076
  License revenues...............       806        717        535      2,558       2,639        820        501       1,110
                                    -------    -------    -------    -------     -------    -------    -------    --------
    Total net revenues...........    18,139     18,083     18,328     22,991      35,147     48,328     62,314     103,186
Gross profit (loss)..............     1,902       (587)     1,349      4,966       9,206     14,621     25,839      46,102
Income (loss) from operations....    (5,373)    (6,949)    (6,788)    (3,831)        773      5,402     10,497      27,365
Net income (loss)................    (7,273)    (6,748)    (6,577)    (3,630)        448      5,743      9,644      22,536
Net income (loss) per
  share--basic...................   $ (0.11)   $ (0.10)   $ (0.09)   $ (0.05)    $  0.01    $  0.08    $  0.13    $   0.25
Net income (loss) per
  share--diluted.................   $ (0.11)   $ (0.10)   $ (0.09)   $ (0.05)    $  0.01    $  0.07    $  0.11    $   0.24
</TABLE>

                                       7
<PAGE>
                                  RISK FACTORS

    YOU SHOULD CAREFULLY CONSIDER THE RISKS DESCRIBED BELOW BEFORE MAKING AN
INVESTMENT DECISION. THE RISKS DESCRIBED BELOW ARE NOT THE ONLY RISKS FACING OUR
COMPANY. ADDITIONAL RISKS NOT PRESENTLY KNOWN TO US OR THAT WE CURRENTLY BELIEVE
ARE NOT SERIOUS MAY ALSO IMPAIR OUR BUSINESS AND OUR FINANCIAL CONDITION. OUR
BUSINESS COULD BE HARMED BY ANY OF THESE RISKS. THE TRADING PRICE OF OUR COMMON
STOCK COULD DECLINE AT ANY TIME DUE TO ANY OF THESE RISKS AND YOU MAY LOSE ALL
OR PART OF YOUR INVESTMENT. IN ASSESSING THESE RISKS, YOU SHOULD ALSO REFER TO
THE OTHER INFORMATION CONTAINED OR INCORPORATED BY REFERENCE IN THIS PROSPECTUS,
INCLUDING OUR FINANCIAL STATEMENTS AND RELATED NOTES.

                         RISKS RELATED TO OUR BUSINESS

OUR OPERATING RESULTS FLUCTUATE SIGNIFICANTLY, AND AN UNANTICIPATED DECLINE IN
REVENUE MAY DISAPPOINT SECURITIES ANALYSTS OR INVESTORS AND RESULT IN A DECLINE
IN OUR STOCK PRICE.

    Our recent growth rate may not be sustainable, and you should not use our
past financial performance to predict future operating results. We incurred net
losses in fiscal 1997, 1998 and 1999. Our recent quarterly and annual operating
results have fluctuated, and will continue to fluctuate, due to the following
factors, all of which are difficult to forecast and many of which are out of our
control:

    - the availability, timely delivery and cost of wafers from our suppliers;

    - competitive pricing pressures and related changes in selling prices;

    - fluctuations in manufacturing yields and significant yield losses;

    - new product announcements and introductions of competing products by us or
      our competitors;

    - product obsolescence;

    - lower of cost or market inventory adjustments;

    - changes in demand for, or in the mix of, our products;

    - the gain or loss of significant customers;

    - market acceptance of products utilizing our SuperFlash technology;

    - changes in the channels through which our products are distributed and the
      timeliness of receipt of distributor resale information;

    - exchange rate fluctuations;

    - general economic, political and environmental-related conditions, such as
      natural disasters;

    - difficulties in forecasting, planning and managing inventory levels;

    - unanticipated research and development expenses associated with new
      product introductions; and

    - the timing of significant orders and of license and royalty revenue.

    A downturn in the market for consumer products such as personal computers
and cellular telephones that incorporate our products can also harm our
operating results.

WE DEPEND ON A LIMITED NUMBER OF FOREIGN FOUNDRIES TO MANUFACTURE OUR PRODUCTS,
AND THESE FOUNDRIES MAY NOT BE ABLE TO SATISFY OUR MANUFACTURING REQUIREMENTS,
WHICH COULD CAUSE OUR REVENUES TO DECLINE.

    We outsource all of our manufacturing with the exception of limited testing
activities. We currently buy all of our wafers and sorted die from a limited
number of suppliers. Substantially all of our products are manufactured by three
foundries, Taiwan Semiconductor Manufacturing Co., Ltd. in Taiwan, Sanyo
Electric Co., Ltd. in Japan and Samsung Electronics Ltd. in Korea. We anticipate
that these foundries, together with National Semiconductor Corporation in the
United States, will

                                       8
<PAGE>
manufacture the majority of our products in 2001. If these suppliers fail to
satisfy our requirements on a timely basis and at competitive prices we could
suffer manufacturing delays, a possible loss of revenues or higher than
anticipated costs of revenues, any of which could harm our operating results.

    Given the current constraints on worldwide semiconductor manufacturing
capacity, our revenues for the next several quarters will largely be determined
by our ability to obtain adequate wafer supplies from our foundries. We are
currently unable to meet all of the demand for our products, and have in the
past failed to meet scheduled shipment dates, due to our inability to obtain a
sufficient supply of wafers and sorted die from our foundries. The foundries
with which we currently have arrangements, together with any additional foundry
at which capacity might be obtained, may not be willing or able to satisfy all
of our manufacturing requirements on a timely basis at favorable prices. In
addition, we have encountered delays in qualifying new products and in ramping
new product production and could experience these delays in the future. We are
also subject to the risks of service disruptions, raw material shortages and
price increases by the foundries. Such disruptions, shortages and price
increases could harm our operating results.

IF WE ARE UNABLE TO INCREASE OUR MANUFACTURING CAPACITY, OUR REVENUES MAY
DECLINE.

    In order to grow, we need to increase our present manufacturing capacity.
Events that we have not foreseen could arise which would further limit our
capacity. We are continually engaged in attempting to secure additional
manufacturing capacity to support our long-term growth. While we have made
arrangements with manufacturers to provide us with more than twice the capacity
in 2001 as compared to 2000, we still anticipate being unable to satisfy all of
our indicated customer demand, at least in the first half of 2001. In the longer
term we may determine that it is necessary to invest substantial capital in
order to secure appropriate production capacity commitments. If we cannot secure
additional manufacturing capacity on acceptable terms, our ability to grow will
be impaired and our operating results will be harmed.

OUR COST OF REVENUES MAY INCREASE IF WE ARE REQUIRED TO PURCHASE MANUFACTURING
CAPACITY IN THE FUTURE.

    To obtain additional manufacturing capacity, we may be required to make
deposits, equipment purchases, loans, joint ventures, equity investments or
technology licenses in or with wafer fabrication companies. These transactions
could involve a commitment of substantial amounts of our capital and technology
licenses in return for production capacity. We may be required to seek
additional debt or equity financing if we need substantial capital in order to
secure this capacity and we cannot assure you that we will be able to obtain
such financing.

IF OUR FOUNDRIES FAIL TO ACHIEVE ACCEPTABLE WAFER MANUFACTURING YIELDS, WE WILL
EXPERIENCE HIGHER COSTS OF REVENUES AND REDUCED PRODUCT AVAILABILITY.

    The fabrication of our products requires wafers to be produced in a highly
controlled and ultra-clean environment. Semiconductor companies that supply our
wafers sometimes have experienced problems achieving acceptable wafer
manufacturing yields. Semiconductor manufacturing yields are a function of both
our design technology and the foundry's manufacturing process technology. Low
yields may result from marginal design or manufacturing process drift. Yield
problems may not be identified until the wafers are well into the production
process, which often makes them difficult, time consuming and costly to correct.
Furthermore, we rely on independent foreign foundries for our wafers which
increases the effort and time required to identify, communicate and resolve
manufacturing yield problems. If our foundries fail to achieve acceptable
manufacturing yields, we will experience higher costs of revenues and reduced
product availability, which would harm our operating results.

                                       9
<PAGE>
IF OUR FOUNDRIES DISCONTINUE THE MANUFACTURING PROCESSES NEEDED TO MEET OUR
DEMANDS, OR FAIL TO UPGRADE THE TECHNOLOGIES NEEDED TO MANUFACTURE OUR PRODUCTS,
WE MAY FACE PRODUCTION DELAYS AND LOWER REVENUES.

    Our wafer and product requirements typically represent a small portion of
the total production of the foundries that manufacture our products. As a
result, we are subject to the risk that a foundry will cease production on an
older or lower-volume manufacturing process that it uses to produce our parts.
Additionally, we cannot be certain our foundries will continue to devote
resources to advance the process technologies on which the manufacturing of our
products is based. Each of these events could increase our costs and harm our
ability to deliver our products on time.

OUR DEPENDENCE ON THIRD-PARTY SUBCONTRACTORS TO ASSEMBLE AND TEST OUR PRODUCTS
SUBJECTS US TO A NUMBER OF RISKS, INCLUDING AN INADEQUATE SUPPLY OF PRODUCTS AND
HIGHER COSTS OF MATERIALS.

    We depend on independent subcontractors to assemble and test our products.
Our reliance on these subcontractors involves the following significant risks:

    - reduced control over delivery schedules and quality;

    - the potential lack of adequate capacity during periods of strong demand;

    - difficulties selecting and integrating new subcontractors;

    - limited warranties on products supplied to us;

    - potential increases in prices due to capacity shortages and other factors;
      and

    - potential misappropriation of our intellectual property.

    These risks may lead to increased costs, delayed product delivery or loss of
competitive advantage which would harm our profitability and customer
relationships.

OUR OPERATING EXPENSES ARE RELATIVELY FIXED, AND WE ORDER MATERIALS IN ADVANCE
OF ANTICIPATED CUSTOMER DEMAND. THEREFORE, WE HAVE LIMITED ABILITY TO REDUCE
EXPENSES QUICKLY IN RESPONSE TO ANY REVENUE SHORTFALLS.

    Our operating expenses are relatively fixed, and we therefore have limited
ability to reduce expenses quickly in response to any revenue shortfalls.
Consequently, our operating results will be harmed if our revenues do not meet
our revenue projections. We may experience revenue shortfalls for the following
reasons:

    - significant pricing pressures that occur because of declines in selling
      prices over the life of a product;

    - sudden shortages of raw materials or fabrication, test or assembly
      capacity constraints that lead our suppliers to allocate available
      supplies or capacity to other customers which, in turn, harm our ability
      to meet our sales obligations; and

    - the reduction, rescheduling or cancellation of customer orders.

    In addition, we typically plan our production and inventory levels based on
internal forecasts of customer demand, which are highly unpredictable and can
fluctuate substantially. From time to time, in response to anticipated long lead
times to obtain inventory and materials from our outside suppliers and
foundries, we may order materials in advance of anticipated customer demand.
This advance ordering may result in excess inventory levels or unanticipated
inventory write-downs if expected orders fail to materialize.

                                       10
<PAGE>
BECAUSE OUR FLASH MEMORY PRODUCTS TYPICALLY HAVE LENGTHY SALES CYCLES, WE MAY
EXPERIENCE SUBSTANTIAL DELAYS BETWEEN INCURRING EXPENSES RELATED TO RESEARCH AND
DEVELOPMENT AND THE GENERATION OF REVENUES.

    Due to the flash memory product cycle we usually require more than
nine months to realize volume shipments after we first contact a customer. We
first work with customers to achieve a design win, which may take three months
or longer. Our customers then complete the design, testing and evaluation
process and begin to ramp up production, a period which typically lasts an
additional six months or longer. As a result, a significant period of time may
elapse between our research and development efforts and our realization of
revenue, if any, from volume purchasing of our products by our customers.

WE FACE INTENSE COMPETITION FROM COMPANIES WITH SIGNIFICANTLY GREATER FINANCIAL,
TECHNICAL AND MARKETING RESOURCES THAT COULD HARM SALES OF OUR PRODUCTS.

    We compete with major domestic and international semiconductor companies,
many of which have substantially greater financial, technical, marketing,
distribution, and other resources than we do. Many of our competitors have their
own facilities for the production of semiconductor memory components and have
recently added significant capacity for such production. Our memory products,
which presently account for substantially all of our revenues, compete
principally against products offered by Intel, Advanced Micro Devices, Atmel,
STMicroelectronics, Sanyo, Winbond Electronics and Macronix. If we are
successful in developing our high density products, these products will compete
principally with products offered by Intel, Advanced Micro Devices, Fujitsu,
Sharp, Samsung Semiconductor, SanDisk and Toshiba, as well as any new entrants
to the market.

    In addition, we may in the future experience direct competition from our
foundry partners. We have licensed to our foundry partners the right to
fabricate products based on our technology and circuit design, and to sell such
products worldwide, subject to our receipt of royalty payments.

    Competition may also come from alternative technologies such as
ferroelectric random access memory, or FRAM, or other developing technologies.

OUR MARKETS ARE SUBJECT TO RAPID TECHNOLOGICAL CHANGE, AND THEREFORE, OUR
SUCCESS DEPENDS ON OUR ABILITY TO DEVELOP AND INTRODUCE NEW PRODUCTS.

    The markets for our products are characterized by:

    - rapidly changing technologies;

    - evolving and competing industry standards;

    - changing customer needs;

    - frequent new product introductions and enhancements;

    - increased integration with other functions; and

    - rapid product obsolescence.

    To develop new products for our target markets, we must develop, gain access
to and use leading technologies in a cost-effective and timely manner and
continue to expand our technical and design expertise. In addition, we must have
our products designed into our customers' future products and maintain close
working relationships with key customers in order to develop new products that
meet their changing needs.

    In addition, products for communications applications are based on
continually evolving industry standards. Our ability to compete will depend on
our ability to identify and ensure compliance with these industry standards. As
a result, we could be required to invest significant time and effort and incur
significant expense to redesign our products and ensure compliance with relevant
standards. We believe that products for these applications will encounter
intense competition and be highly price

                                       11
<PAGE>
sensitive. While we are currently developing and introducing new products for
these applications, we cannot assure you that these products will reach the
market on time, will satisfactorily address customer needs, will be sold in high
volume, or will be sold at profitable margins.

    We cannot assure you that we will be able to identify new product
opportunities successfully, develop and bring to market new products, achieve
design wins or respond effectively to new technological changes or product
announcements by our competitors. In addition, we may not be successful in
developing or using new technologies or in developing new products or product
enhancements that achieve market acceptance. Our pursuit of necessary
technological advances may require substantial time and expense. Failure in any
of these areas could harm our operating results.

OUR FUTURE SUCCESS DEPENDS IN PART ON THE CONTINUED SERVICE OF OUR KEY DESIGN
ENGINEERING, SALES, MARKETING AND EXECUTIVE PERSONNEL AND OUR ABILITY TO
IDENTIFY, RECRUIT AND RETAIN ADDITIONAL PERSONNEL.

    We are highly dependent on Bing Yeh, our President and Chief Executive
Officer, as well as the other principal members of our management and
engineering staff. There is intense competition for qualified personnel in the
semiconductor industry, in particular the highly skilled design, applications
and test engineers involved in the development of flash memory technology.
Competition is especially intense in Silicon Valley, where our corporate
headquarters is located. We may not be able to continue to attract and retain
engineers or other qualified personnel necessary for the development of our
business or to replace engineers or other qualified personnel who may leave our
employ in the future. Our anticipated growth is expected to place increased
demands on our resources and will likely require the addition of new management
and engineering personnel and the development of additional expertise by
existing management personnel. The failure to recruit and retain key design
engineers or other technical and management personnel could harm our business.

OUR ABILITY TO COMPETE SUCCESSFULLY WILL DEPEND, IN PART, ON OUR ABILITY TO
PROTECT OUR INTELLECTUAL PROPERTY RIGHTS.


    We rely on a combination of patents, trade secrets, copyrights, mask work
rights, nondisclosure agreements and other contractual provisions and technical
measures to protect our intellectual property rights. Policing unauthorized use
of our products, however, is difficult, especially in foreign countries.
Litigation may continue to be necessary in the future to enforce our
intellectual property rights, to protect our trade secrets, to determine the
validity and scope of the proprietary rights of others, or to defend against
claims of infringement or invalidity. Litigation could result in substantial
costs and diversion of resources and could harm our business, operating results
and financial condition regardless of the outcome of the litigation.


    We own 23 patents in the United States relating to our products and
processes, and have filed for several more. In addition, we hold three patents
in Europe, two patents in Germany and additional foreign patent applications
have been filed in Europe, Japan, Taiwan and Canada. We cannot assure you that
any pending patent application will be granted. Our operating results could be
seriously harmed by the failure to protect our intellectual property.

IF WE ARE ACCUSED OF INFRINGING THE INTELLECTUAL PROPERTY RIGHTS OF OTHER
PARTIES, WE MAY BECOME SUBJECT TO TIME-CONSUMING AND COSTLY LITIGATION. IF WE
LOSE, WE COULD SUFFER A SIGNIFICANT IMPACT ON OUR BUSINESS AND BE FORCED TO PAY
DAMAGES.

    Third parties may assert that our products infringe their proprietary
rights, or may assert claims for indemnification resulting from infringement
claims against us. Any such claims may cause us to delay or cancel shipment of
our products or pay damages which could seriously harm our business, financial
condition and results of operations. In addition, irrespective of the validity
or the successful assertion of such claims, we could incur significant costs in
defending against such claims.

                                       12
<PAGE>

    Over the past three years we were sued both by Atmel Corporation and Intel
Corporation regarding patent infringement issues and by Winbond Electronics
Corporation regarding our contractual relationship with them. Significant
management time and financial resources have been devoted to defending these
lawsuits. We settled with Intel in May 1999, with Winbond in October 2000, and
the Atmel litigation is ongoing.


    In addition to the Atmel, Intel and Winbond actions, we receive from time to
time letters or communications from other companies stating that such companies
have patent rights which involve our products. Since the design of all of our
products is based on SuperFlash technology, any legal finding that the use of
our SuperFlash technology infringes the patent of another company would have a
significantly negative effect on our entire product line and operating results.
Furthermore, if such a finding were made, there can be no assurance that we
could license the other company's technology on commercially reasonable terms or
that we could successfully operate without such technology. Moreover, if we are
found to infringe, we could be required to pay damages to the owner of the
protected technology and could be prohibited from making, using, selling, or
importing into the United States any products that infringe the protected
technology. In addition, the management attention consumed by and legal cost
associated with any litigation could harm our operating results.

    PUBLIC ANNOUNCEMENTS MAY HURT OUR STOCK PRICE.  During the course of
lawsuits there may be public announcements of the results of hearings, motions,
and other interim proceedings or developments in the litigation. If securities
analysts or investors perceive these results to be negative, it could harm the
market price of our stock.


    OUR LITIGATION MAY BE EXPENSIVE, MAY BE PROTRACTED AND CONFIDENTIAL
INFORMATION MAY BE COMPROMISED. Whether or not we are successful in our lawsuit
with Atmel, we expect this litigation to consume substantial amounts of our
financial and managerial resources. At any time Atmel may file additional claims
against us, which could increase the risk, expense and duration of the
litigation. Further, because of the substantial amount of discovery required in
connection with this type of litigation, there is a risk that some of our
confidential information could be compromised by disclosure.


OUR BUSINESS MAY SUFFER DUE TO RISKS ASSOCIATED WITH INTERNATIONAL SALES AND
OPERATIONS.

    During 1997, 1998, 1999 and the six months ended June 30, 2000, our export
product and licensing revenues accounted for approximately 87%, 93%, 89% and 85%
of our net revenues, respectively. Our international business activities are
subject to a number of risks, each of which could impose unexpected costs on us
that would have an adverse effect on our operating results. These risks include:

    - difficulties in complying with regulatory requirements and standards;

    - tariffs and other trade barriers;

    - costs and risks of localizing products for foreign countries;

    - reliance on third parties to distribute our products;

    - longer accounts receivable payment cycles;

    - potentially adverse tax consequences;

    - limits on repatriation of earnings; and

    - burdens of complying with a wide variety of foreign laws.

    We derived 81% and 79% of our product revenue from Asia during 1999 and the
six months ended June 30, 2000, respectively. Additionally, our major wafer
suppliers and assembly and packaging subcontractors are all located in Asia. Any
kind of economic, political or environmental instability in this region of the
world could harm our operating results due to the large concentration of our
production and sales activities in this region. For example, during 1997 and
1998, several Asian

                                       13
<PAGE>
countries where we do business, such as Japan, Taiwan and Korea, experienced
severe currency fluctuation and economic deflation, which negatively impacted
our total revenues and also negatively impacted our ability to collect payments
from these customers. During this period, the lack of capital in the financial
sectors of these countries made it difficult for our customers to open letters
of credit or other financial instruments that are guaranteed by foreign banks.
Finally, the economic situation in this period exacerbated a decline in selling
prices for our products as our competitors reduced product prices to generate
needed cash.

    It should also be noted that we are greatly impacted by the political,
economic and military conditions in Taiwan. Taiwan and China are continuously
engaged in political disputes and both countries have conducted military
exercises in or near the other's territorial waters and airspace. Such disputes
may continue and even escalate, resulting in an economic embargo, a disruption
in shipping or even military hostilities. Any of these events could delay
production or shipment of our products. Any kind of activity of this nature or
even rumors of such activity could harm our operations, revenues, operating
results, and stock price.

BECAUSE A SMALL NUMBER OF CUSTOMERS HAVE ACCOUNTED FOR, AND ARE LIKELY TO
CONTINUE TO ACCOUNT FOR, A SUBSTANTIAL PORTION OF OUR REVENUES, OUR REVENUES
COULD DECLINE DUE TO THE LOSS OF ONE OF THESE CUSTOMERS.

    More than half of our revenues come from a small number of customers. For
example, product sales to our top 10 customers accounted for approximately 62%,
66%, 57% and 46% of our product revenues for 1997, 1998, 1999 and the six months
ended June 30, 2000, respectively. One customer accounted for 16% and 15% of
product sales in 1997 and 1998. Another customer accounted for 11%, 12% and 11%
of product sales in 1998, 1999 and the six months ended June 30, 2000,
respectively. If we were to lose any of these customers or experience any
substantial reduction in orders from these customers, our revenues and operating
results would be harmed. In addition, the composition of our major customer base
changes from year to year as the market demand for our customers' products
change.

WE DO NOT TYPICALLY ENTER INTO LONG-TERM CONTRACTS WITH OUR CUSTOMERS, AND THE
LOSS OF A MAJOR CUSTOMER COULD HARM OUR BUSINESS.

    We do not typically enter into long-term contracts with our customers, and
we cannot be certain as to future order levels from our customers. When we do
enter into a long-term contract, the contract is generally terminable at the
convenience of the customer. An early termination by one of our major customers
would likely harm our financial results as it is unlikely that we would be able
to rapidly replace that revenue source.

CANCELLATIONS OR RESCHEDULING OF BACKLOG MAY RESULT IN LOWER FUTURE REVENUE AND
HARM OUR BUSINESS.

    Due to possible customer changes in delivery schedules and cancellations of
orders, our backlog at any particular date is not necessarily indicative of
actual sales for any succeeding period. A reduction of backlog during any
particular period, or the failure of our backlog to result in future revenue,
could harm our business.

IF AN EARTHQUAKE OR OTHER NATURAL DISASTER STRIKES OUR MANUFACTURING FACILITY OR
THOSE OF OUR SUPPLIERS, WE WOULD BE UNABLE TO MANUFACTURE OUR PRODUCTS FOR A
SUBSTANTIAL AMOUNT OF TIME AND WE WOULD EXPERIENCE LOST REVENUES.

    Our corporate headquarters are located in California near major earthquake
faults. In addition, some of our suppliers are located near fault lines. In the
event of a major earthquake or other natural disaster near our headquarters, our
operations could be harmed. Similarly, a major earthquake or other natural
disaster near one or more of our major suppliers, like the one that occurred in
Taiwan in

                                       14
<PAGE>
September 1999, could disrupt the operations of those suppliers, which could
limit the supply of our products and harm our business.

WE DEPEND ON MANUFACTURERS' REPRESENTATIVES AND DISTRIBUTORS TO GENERATE A
MAJORITY OF OUR REVENUES.

    We rely on manufacturers' representatives and distributors to sell our
products and these entities could discontinue selling our products at any time.
Two of our manufacturers' representatives are responsible for substantially all
of our sales in Taiwan, which accounted for 28% of our product revenues during
1999 and for the six months ended June 30, 2000. One manufacturers'
representative accounted for substantially all of our sales in China, including
Hong Kong, during 1999 and the six months ended June 30, 2000, which accounted
for 24% of our total product revenues for 1999 and the six months ended
June 30, 2000. The loss of any of these manufacturers' representatives, or any
other significant manufacturers' representative or distributor could harm our
operating results by impairing our ability to sell our products.

OUR GROWTH CONTINUES TO PLACE A SIGNIFICANT STRAIN ON OUR MANAGEMENT SYSTEMS AND
RESOURCES AND IF WE FAIL TO MANAGE OUR GROWTH, OUR ABILITY TO MARKET AND SELL
OUR PRODUCTS AND DEVELOP NEW PRODUCTS MAY BE HARMED.

    Our business is experiencing rapid growth which has strained our internal
systems and will require us to continuously develop sophisticated information
management systems in order to manage the business effectively. We are currently
implementing a supply-chain management system and a vendor electronic data
interface system. There is no guarantee that we will be able to implement these
new systems in a timely fashion, that in themselves they will be adequate to
address our expected growth, or that management will be able to foresee in a
timely manner other infrastructure needs before they arise. Our success depends
on the ability of our executive officers to effectively manage our growth. If we
are unable to manage our growth effectively, our results of operations will be
seriously harmed. If we fail to successfully implement new management
information systems, our business may suffer severe inefficiencies that may harm
the results of our operations.

                         RISKS RELATED TO OUR INDUSTRY

OUR SUCCESS IS DEPENDENT ON THE GROWTH AND STRENGTH OF THE FLASH MEMORY MARKET.

    All of our products, as well as all new products currently under design, are
stand-alone flash memory devices or devices embedded with flash memory. A memory
technology other than SuperFlash may be adopted as an industry standard. Our
competitors are generally in a better financial and marketing position than we
are from which to influence industry acceptance of a particular memory
technology. In particular, a primary source of competition may come from
alternative technologies such as FRAM devices if such technology is
commercialized for higher density applications. To the extent our competitors
are able to promote a technology other than SuperFlash as an industry standard,
our business will be harmed.

THE SELLING PRICES FOR OUR PRODUCTS ARE EXTREMELY VOLATILE AND HAVE HISTORICALLY
DECLINED. IN ADDITION, THE CYCLICAL NATURE OF THE SEMICONDUCTOR INDUSTRY COULD
CREATE FLUCTUATIONS IN OUR OPERATING RESULTS, AS WE EXPERIENCED IN 1997 AND
1998.

    The semiconductor industry has historically been cyclical, characterized by
wide fluctuations in product supply and demand. From time to time, the industry
has also experienced significant downturns, often in connection with, or in
anticipation of, maturing product cycles and declines in general economic
conditions. Downturns of this type occurred in 1997 and 1998. These downturns
have been characterized by diminished product demand, production over-capacity
and accelerated decline of selling prices, and in some cases have lasted for
more than a year. Our business could be harmed by industry-wide fluctuations in
the future. The flash memory products portion of the semiconductor

                                       15
<PAGE>
industry, from which we derived substantially all of our revenues in 1998,
continued to suffer from excess capacity in 1998, which resulted in greater than
normal price declines in our markets, which unfavorably impacted our revenues,
gross margins and profitability. While these conditions have improved in recent
periods, if they were to resume our growth and operating results would be
harmed.

THERE IS SEASONALITY IN OUR BUSINESS AND IF WE FAIL TO CONTINUE TO INTRODUCE NEW
PRODUCTS THIS SEASONALITY MAY BECOME MORE PRONOUNCED.

    Sales of our products in the consumer electronics applications market are
subject to seasonality. As a result, sales of these products are impacted by
seasonal purchasing patterns with higher sales generally occurring in the second
half of each year. In 1998 and 1999 this seasonality was partially offset by the
introduction of new products as we continued to diversify our product offerings.
If we fail to continue to introduce new products, our business may suffer and
the seasonality of a portion of our sales may become more pronounced.

                         RISKS RELATED TO THIS OFFERING

THE NOTES ARE SUBORDINATED TO SENIOR INDEBTEDNESS.

    The notes are unsecured and will be subordinated in right of payment to all
of our existing and future senior indebtedness. In the event of our bankruptcy,
liquidation or reorganization or upon acceleration of the notes due to an event
of default under the indenture and in certain other events, our assets will be
available to pay obligations on the notes only after all senior indebtedness,
and secured indebtedness ranking equally with the notes in right of payment to
the extent of any such collateral, has been paid. As a result, there may not be
sufficient assets remaining to pay amounts due on any or all of the outstanding
notes. The notes also will be effectively subordinated to the liabilities,
including trade payables of our subsidiaries. Neither we nor our subsidiaries
are prohibited from incurring debt, including senior indebtedness and secured
indebtedness, under the indenture. If we or our subsidiaries were to incur
additional debt or liabilities, our ability to pay our obligations on the notes
could be further adversely affected. As of August 31, 2000, we had no senior
indebtedness outstanding. Our subsidiaries had approximately $3,400 of
outstanding indebtedness and other liabilities, including trade payables and
excluding intercompany liabilities. We and our subsidiaries may from time to
time incur additional debt, including senior and secured indebtedness. See
"Description of the Notes--Subordination of Notes."

IF WE COMPLETE THE OFFERING OF THE CONVERTIBLE SUBORDINATED NOTES, WE WILL BE
INCREASING OUR INDEBTEDNESS SUBSTANTIALLY.

    As a result of the sale of the notes, we will incur $150 million of
additional indebtedness, $172.5 million if the underwriters' over-allotment
option is exercised, increasing our ratio of debt to equity, expressed as a
percentage, from approximately 18% to approximately 61%, 68% if the
underwriters' over-allotment option is exercised, as of June 30, 2000, on an as
adjusted basis giving effect to the sale of the notes. We may incur substantial
additional indebtedness in the future. The level of our indebtedness, among
other things, could:

    - make it difficult for us to make payments on the notes which may harm our
      business;

    - make it difficult for us to obtain any necessary future financing for
      working capital, capital expenditures, debt service requirements or other
      purposes;

    - require us to dedicate a substantial portion of our expected cash flow
      from operations to service our indebtedness, which would reduce the amount
      of our expected cash flow available for other purposes, including working
      capital and capital expenditures;

                                       16
<PAGE>
    - limit our flexibility in planning for, or reacting to changes in our
      business; and

    - make us more vulnerable in the event of a downturn in our business.

There can be no assurance that we will be able to meet our debt service
obligations, including our obligations under the notes.

WE CANNOT ASSURE YOU THAT PRICES FOR OUR NOTES WILL NOT DECLINE AFTER THE
OFFERING.

    Before this offering, there has not been a public market for the notes and
the market price of the notes may decline below the public offering price. The
public offering price will be determined by negotiations between us and the
representatives of the underwriters. In addition, an active public market for
the notes may not develop or be sustained after this offering.

WE EXPECT THE PRICE OF OUR COMMON STOCK, AND THEREFORE THE NOTES, TO BE HIGHLY
VOLATILE AND YOU MAY LOSE ALL OR PART OF YOUR INVESTMENT.

    Our common stock is quoted for trading on The Nasdaq Stock Market's National
Market. The market price for our common stock may continue to be highly volatile
for a number of reasons including:

    - fluctuations in our quarterly or yearly operating results;

    - our status as a technology company;

    - the rapid pace of technological change;

    - the uncertainty of our business transactions;

    - the contents of news, security analyst reports or other information
      forums;

    - changes in earnings estimates by analysts;

    - market conditions in the industry;

    - announcements by competitors;

    - the status of our litigation;

    - regulatory actions;

    - general economic conditions; and

    - broad market trends unrelated to our performance.

    In addition, stock prices for many technology companies fluctuate widely for
reasons which may be unrelated to operating results. These fluctuations, as well
as general economic, market and political conditions such as recessions or
military conflicts, may harm the market price of our common stock, and therefore
the notes.

WE HAVE IMPLEMENTED SOME ANTI-TAKEOVER PROVISIONS, INCLUDING A SHAREHOLDER
RIGHTS PLAN, THAT MAY PREVENT OR DELAY AN ACQUISITION OF US THAT MIGHT BE
BENEFICIAL TO OUR SHAREHOLDERS.

    Provisions of our amended and restated articles of incorporation and bylaws,
as well as provisions of California law, could make it more difficult for a
third party to acquire us, even if doing so would be beneficial to our
shareholders. These provisions include:

    - the ability of our board of directors to issue without shareholder
      approval "blank check" preferred stock to increase the number of
      outstanding shares and thwart a takeover attempt;

    - limitations on who may call special meetings of shareholders;

                                       17
<PAGE>
    - prohibitions of shareholder action by written consent, thereby requiring
      all shareholder actions to be taken at a meeting of our shareholders; and

    - advance notice requirements for nominations for election to the board of
      directors or for proposing matters that can be acted upon by shareholders
      at shareholder meetings.

In May 1999, our board of directors adopted a share purchase rights plan,
commonly referred to as a "poison pill." In addition, the terms of our stock
option plans may discourage, delay or prevent a change in our control.

                                       18
<PAGE>
                                USE OF PROCEEDS

    The net proceeds we will receive from the sale of the convertible
subordinated notes in this offering will be approximately $144.5 million, or
$166.3 million if the underwriters' over-allotment option is exercised in full,
after deducting estimated underwriting discounts and commissions and estimated
offering expenses.

    We intend to use the proceeds of this offering primarily for working capital
and general corporate purposes. In addition, we may use a portion of the net
proceeds to acquire businesses or technologies. We are currently investigating
arrangements that could provide us with additional long-term wafer production
capacity. These arrangements could involve the formation of joint ventures with
leading technology companies. Such arrangements would likely involve a
substantial capital commitment by us. No agreements or understandings are
presently in effect with respect to these arrangements. Pending such uses, we
expect to invest the net proceeds in short-term, interest-bearing, investment
grade securities.

                                       19
<PAGE>
                                 CAPITALIZATION

    The following table sets forth the following information:

    - our actual capitalization as of June 30, 2000;

    - The as adjusted balance sheet data gives effect to the net proceeds from
      the sale of $150 million principal amount of convertible subordinated
      notes offered in this offering after deducting estimated underwriting
      discounts and commissions and estimated offering expenses.


    - The as further adjusted balance sheet data gives effect to the net
      proceeds from the sale of $150 million principal amount of convertible
      subordinated notes offered in this offering and the net proceeds from the
      sale of 5,000,000 shares of common stock offered in the concurrent common
      stock offering at an assumed public offering price of $25.1875 per share,
      in each case, after deducting estimated underwriting discounts and
      commissions and estimated offering expenses. Completion of the common
      stock offering is not a condition to this offering.



<TABLE>
<CAPTION>
                                                                       AS OF JUNE 30, 2000
                                                              --------------------------------------
                                                                                         AS FURTHER
                                                               ACTUAL     AS ADJUSTED     ADJUSTED
                                                              ---------   ------------   -----------
                                                              (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                           <C>         <C>            <C>
Cash and cash equivalents...................................  $170,632       $315,122     $434,358
                                                              ========       ========     ========
Long-term obligations, net of current portion...............       364        144,854      145,314
                                                              --------       --------     --------
Shareholders' equity:
  Preferred stock, no par value; 7,000,000 shares
    authorized, series A junior participating preferred
    stock, no par value; 450,000 shares designated, no
    shares issued and outstanding (actual, as adjusted and
    as further adjusted)....................................        --             --           --
  Common stock, no par value; 250,000,000 shares authorized,
    89,202,000 shares issued and outstanding (actual and as
    adjusted); 94,202,000 shares issued and outstanding (as
    further adjusted).......................................   324,968        324,968      443,744
  Accumulated other comprehensive income....................        56             56           56
  Retained earnings.........................................    12,625         12,625       12,625
                                                              --------       --------     --------
    Total shareholders' equity..............................   337,649        337,649      456,425
                                                              --------       --------     --------
    Total capitalization....................................  $338,013       $482,503     $601,739
                                                              ========       ========     ========
</TABLE>


    The number of shares of common stock to be outstanding after this offering
is based on the number of shares outstanding as of June 30, 2000, and excludes:

    - 10,066,000 shares subject to options outstanding as of June 30, 2000, at a
      weighted average exercise price of $4.723 per share;

    - 4,696,000 additional shares that we could issue under our stock option
      plans;

    - 1,771,000 shares that we could issue under our employee stock purchase
      plan; and

    - shares of common stock issuable upon the conversion of the convertible
      subordinated notes offered for sale in this offering.

    The above data has been retroactively adjusted, as appropriate, to reflect a
3-for-1 stock split which was effected in August 2000.

                                       20
<PAGE>
                      SELECTED CONSOLIDATED FINANCIAL DATA

    The following selected consolidated financial data should be read in
conjunction with "Management's Discussion and Analysis of Financial Condition
and Results of Operations" and the Consolidated Financial Statements and the
notes thereto incorporated by reference in this prospectus. The statements of
operations data for the years ended December 31, 1997, 1998 and 1999 and the
balance sheet data at December 31, 1998 and 1999 are derived from, and should be
read in conjunction with, the audited consolidated financial statements and
notes thereto incorporated by reference in this prospectus. The statements of
operations data for the year ended December 31, 1995 and 1996 and the balance
sheet data at December 31, 1995, 1996 and 1997 are derived from audited
financial statements not included in this prospectus. The statements of
operations data for the six months ended June 30, 1999 and 2000 and the balance
sheet data at June 30, 2000 are derived from our Quarterly Report on Form 10-Q
for quarterly period ended June 30, 2000 that is incorporated by reference in
this prospectus. The balance sheet data of June 30, 1999 are derived from our
Quarterly Report on Form 10-Q for quarterly period ended June 30, 1999 that is
not included in this prospectus. On June 16, 2000 our board of directors
approved a 3-for-1 stock split, in the form of a stock dividend, which was
payable on August 11, 2000 to all shareholders of record on July 28, 2000. The
following selected consolidated financial data have been retroactively adjusted,
as appropriate, to reflect this 3-for-1 stock split. The results of operations
are not necessarily indicative of the results to be expected for future periods.


<TABLE>
<CAPTION>
                                                                                                SIX MONTHS ENDED
                                                       YEAR ENDED DECEMBER 31                        JUNE 30
                                        ----------------------------------------------------   -------------------
                                          1995       1996       1997       1998     1999(2)    1999(2)      2000
                                        --------   --------   --------   --------   --------   --------   --------
                                                                                                   (UNAUDITED)
<S>                                     <C>        <C>        <C>        <C>        <C>        <C>        <C>
CONSOLIDATED STATEMENTS OF OPERATIONS
  DATA:
Net Revenues:
  Product revenues....................  $38,283    $90,638    $ 73,796   $ 66,875   $118,242   $ 38,226   $163,889
  License revenues....................    1,245      2,652       1,526      2,536      6,552      3,093      1,611
                                        -------    -------    --------   --------   --------   --------   --------
    Total net revenues................   39,528     93,290      75,322     69,411    124,794     41,319    165,500
Cost of revenues......................   26,360     59,494      62,747     62,703     94,652     35,004     93,559
                                        -------    -------    --------   --------   --------   --------   --------
Gross profit..........................   13,168     33,796      12,575      6,708     30,142      6,315     71,941
                                        -------    -------    --------   --------   --------   --------   --------
Operating expenses:
  Research and development............    4,058      6,948       8,744     14,527     18,199      9,213     17,257
  Sales and marketing.................    2,455      5,292       6,587      7,290     10,576      4,465     10,503
  General and administrative..........    1,464      3,370       9,479      4,592      3,800      1,245      6,319
  In-process research and
    development.......................       --         --          --         --      2,011      2,011         --
                                        -------    -------    --------   --------   --------   --------   --------
    Total operating expenses..........    7,977     15,610      24,810     26,409     34,586     16,934     34,079
                                        -------    -------    --------   --------   --------   --------   --------
Income (loss) from operations.........    5,191     18,186     (12,235)   (19,701)    (4,444)   (10,619)    37,862
Income and other income, net..........      517      1,763       2,146      1,573        730        513      3,100
Interest expense......................     (273)        --          --        (31)      (214)       (36)      (545)
                                        -------    -------    --------   --------   --------   --------   --------
Income (loss) before provision for
  (benefit from) income taxes.........    5,435     19,949     (10,089)   (18,159)    (3,928)   (10,142)    40,417
Provision for (benefit from) income
  taxes...............................     (594)     7,598      (3,165)      (571)        88         65      8,237
                                        -------    -------    --------   --------   --------   --------   --------
Net income (loss).....................  $ 6,029    $12,351    $ (6,924)  $(17,588)  $ (4,016)  $(10,207)  $ 32,180
                                        =======    =======    ========   ========   ========   ========   ========
Net income (loss) per share--basic....  $  0.23    $  0.18    $  (0.10)  $  (0.26)  $  (0.06)  $  (0.15)  $   0.39
                                        =======    =======    ========   ========   ========   ========   ========
Net income (loss) per
  share--diluted......................  $  0.11    $  0.16    $  (0.10)  $  (0.26)  $  (0.06)  $  (0.15)  $   0.36
                                        =======    =======    ========   ========   ========   ========   ========
Shares used in computing net income
  (loss) per share--basic.............   25,899     68,916      69,498     68,874     72,177     70,275     82,530
                                        =======    =======    ========   ========   ========   ========   ========
Shares used in computing net income
  (loss) per share--diluted...........   56,322     75,342      69,498     68,874     72,177     70,275     90,444
                                        =======    =======    ========   ========   ========   ========   ========
</TABLE>


                                       21
<PAGE>

<TABLE>
<CAPTION>
                                                                                            SIX MONTHS ENDED
                                                   YEAR ENDED DECEMBER 31                        JUNE 30
                                    ----------------------------------------------------   -------------------
                                      1995       1996       1997       1998     1999(2)    1999(2)      2000
                                    --------   --------   --------   --------   --------   --------   --------
                                                                                               (UNAUDITED)
<S>                                 <C>        <C>        <C>        <C>        <C>        <C>        <C>
BALANCE SHEET DATA:
Total assets......................  $66,403    $80,914    $ 82,539   $ 56,138   $ 88,806   $ 64,157   $399,569
                                    =======    =======    ========   ========   ========   ========   ========
Long-term obligations.............  $    76    $    71    $     66   $    663   $    446   $    587   $    364
                                    =======    =======    ========   ========   ========   ========   ========
Shareholders' equity..............  $52,172    $64,788    $ 55,889   $ 38,030   $ 41,015   $ 33,573   $337,649
                                    =======    =======    ========   ========   ========   ========   ========

OTHER DATA:
Ratio of earnings to fixed
  charges(1)......................    16.9x     134.0x          --         --         --         --      48.6x
                                    =======    =======    ========   ========   ========   ========   ========
</TABLE>

------------------------

(1) The computation of the ratios of earnings to fixed charges included us and
    our consolidated subsidiaries. Ratio of earnings to fixed charges is
    computed by dividing (a) earnings before taxes adjusted for fixed charges by
    (b) fixed charges, which includes interest expense plus the portion of
    interest expense under operating leases deemed by us to be representative of
    an appropriate interest factor, plus amortization of debt issuance costs. In
    1997, 1998 and 1999, earnings were inadequate to cover fixed charges by
    $10.1 million, $18.2 million and $3.9 million. In the six months ended
    June 30, 1999, earnings were inadequate to cover fixed charges by
    $10.1 million.

(2) In June 1999, we completed the acquisition of Linvex Technology, Corp. The
    acquisition was accounted for using the purchase method of accounting. The
    amount of the purchase price allocated to in-process research and
    development of $2.0 million was expensed at the acquisition date.

                                       22
<PAGE>
                            DESCRIPTION OF THE NOTES

    We will issue the notes under an indenture to be dated as of          , 2000
between us and Bank One Trust Company, N.A., as trustee. The following
summarizes some, but not all, of the provisions of the notes and the indenture.
We urge you to read the indenture because it, and not this description, defines
your rights as a holder of the notes. A copy of the form of indenture and the
form of certificate evidencing the notes is available to you upon request.

GENERAL

    The notes will be our unsecured, general obligations and will be
subordinated in right of payment as described under "Subordination of Notes."
The notes are convertible into common stock as described under "Conversion of
Notes." The notes will be limited to $150 million aggregate principal amount or
such greater amount not exceeding $172.5 million as would be required by the
exercise of the underwriters' over-allotment option. The notes will be issued
only in denominations of $1,000 principal amount or in multiples of $1,000
principal amount. The notes will mature on       , 2005, unless earlier redeemed
by us at our option, purchased by us at your option upon a change in control or
converted at your option. Covenants in our other financing arrangements prohibit
or limit our ability to declare or pay dividends.

    You are not protected under the indenture in the event of a highly leveraged
transaction or a change in control of SST, except to the extent described under
"Purchase of Notes at Your Option Upon a Change in Control."

    The notes will bear interest at the annual rate of       %. Interest will be
payable on each       and       , beginning       , 2001, subject to limited
exceptions if the notes are converted, redeemed or purchased prior to the
interest payment date. The record dates for the payment of interest will be each
      and       . We may, at our option, pay interest on the notes by check
mailed to the holders. However, a holder with an aggregate principal amount in
excess of $2 million will be paid by wire transfer in immediately available
funds at their election. Interest will be computed on the basis of a 360-day
year comprised of twelve 30-day months.

    We will maintain an office in the Borough of Manhattan in New York, New York
where the notes may be presented for registration, transfer, exchange or
conversion. This office will initially be an office or agency of the trustee.

CONVERSION OF NOTES

    You will have the right, at your option, to convert your notes into shares
of common stock at any time prior to maturity, unless previously redeemed or
purchased, at the conversion price of $      per share, subject to the
adjustments described below.

    Except as described below, we will not make any payment or other adjustment
for accrued interest or dividends on any common stock issued upon conversion of
the notes. If you submit your notes for conversion between a record date and the
opening of business on the next interest payment date (except for notes or
portions of notes called for redemption or subject to purchase following a
change in control on a redemption date or a purchase date, as the case may be,
occurring during the period from the close of business on a record date and
ending on the opening of business on the first business day after the next
interest payment date, or if this interest payment date is not a business day,
the second business day after the interest payment date), you must pay funds
equal to the interest payable on the interest payment date on the converted
principal amount.

    We will not issue fractional shares of common stock upon conversion of
notes. Instead, we will pay cash based upon the market price of the common stock
on the last trading day prior to the date of conversion. If the notes are called
for redemption or are subject to purchase following a change in

                                       23
<PAGE>
control, your conversion rights on the notes called for redemption or so subject
to purchase will expire at the close of business on the last business day before
the redemption date or purchase date, as the case may be, unless we default in
the payment of the redemption price or purchase price. If you have submitted
your notes for purchase upon a change in control, you may only convert your
notes if you withdraw your election in accordance with the indenture.

    The conversion price will be adjusted upon the occurrence of:

       (1) the issuance of shares of our common stock as a dividend or
           distribution on our common stock;

       (2) the subdivision or combination of our outstanding common stock;

       (3) the issuance to all or substantially all holders of our common stock
           of rights or warrants entitling them for a period of not more than
           60 days to subscribe for or purchase our common stock, or securities
           convertible into our common stock, at a price per share or a
           conversion price per share less than the then current market price
           per share, provided that the conversion price will be readjusted to
           the extent that such rights or warrants are not exercised prior to
           their expiration;

       (4) the distribution to all or substantially all holders of our common
           stock of shares of our capital stock, evidences of indebtedness or
           other non-cash assets, or rights or warrants excluding:

           - dividends, distributions and rights or warrants referred to in
             clause (1) or (3) above;

           - dividends or distributions exclusively in cash referred to in
             clause (5) below; and

           - distribution of rights to all holders of common stock pursuant to
             SST's shareholder rights plan, so long as upon conversion of the
             notes into common stock to the extent that SST's shareholders
             rights plan is still in effect upon such conversion, the holders
             will receive, in addition to the common stock, the rights described
             therein (whether or not the rights have separated from the common
             stock at the time of conversion), subject to certain limited
             exceptions;

       (5) the dividend or distribution to all or substantially all holders of
           our common stock of all-cash distributions in an aggregate amount
           that together with (A) any cash and the fair market value of any
           other consideration payable in respect of any tender offer by us or
           any of our subsidiaries for our common stock consummated within the
           preceding 12 months not triggering a conversion price adjustment and
           (B) all other all-cash distributions to all or substantially all
           holders of our common stock made within the preceding 12 months not
           triggering a conversion price adjustment, exceeds an amount equal to
           10% of our market capitalization on the business day immediately
           preceding the day on which we declare such distribution; and

       (6) the purchase of our common stock pursuant to a tender offer made by
           us or any of our subsidiaries to the extent that the same involves
           aggregate consideration that, together with (A) any cash and the fair
           market value of any other consideration payable in respect of any
           tender offer by us or any of our subsidiaries for our common stock
           consummated within the preceding 12 months not triggering a
           conversion price adjustment and (B) all-cash distributions to all or
           substantially all holders of our common stock made within the
           preceding 12 months not triggering a conversion price adjustment,
           exceeds an amount equal to 10% of our market capitalization on the
           expiration date of such tender offer.

                                       24
<PAGE>
    In the event of:

       - any reclassification of our common stock, or

       - a consolidation, merger or combination involving SST, or

       - a sale or conveyance to another person of the property and assets of
         SST as an entirety or substantially as an entirety,

in which holders of our outstanding common stock would be entitled to receive
stock, other securities, other property, assets or cash for their common stock,
holders of notes will generally be entitled to convert their notes into the same
type of consideration received by common stock holders immediately prior to one
of these types of events.

    You may, in some circumstances, be deemed to have received a distribution or
dividend subject to United States federal income tax as a result of an
adjustment or the non-occurrence of an adjustment to the conversion price. See
"Certain United States Federal Income Tax Considerations--U.S.
Holders--Dividends."

    We are permitted to reduce the conversion price of the notes by any amount
for a period of at least 20 business days if our board of directors determines
that such reduction would be in our best interest. We are required to give at
least 15 days prior notice of any reduction in the conversion price. We may also
reduce the conversion price to avoid or diminish income tax to holders of our
common stock in connection with a dividend or distribution of stock or similar
event.

    No adjustment in the conversion price will be required unless it would
result in a change in the conversion price of at least one percent. Any
adjustment not made will be taken into account in subsequent adjustments.

    Except as stated above, we will not adjust the conversion price for the
issuance of our common stock or any securities convertible into or exchangeable
for our common stock or the right to purchase our common stock or such
convertible or exchangeable securities.

SUBORDINATION OF NOTES

    The indebtedness evidenced by the notes is subordinated to the extent
provided in the indenture to the prior payment in full, in cash, junior
securities, or other payment satisfactory to holders of senior indebtedness, of
all senior indebtedness.

    Upon any distribution of our assets upon any dissolution, winding-up,
liquidation or reorganization, or in bankruptcy, insolvency, receivership or
similar proceedings, payment of the principal of, premium, if any, and interest
on the notes is to be subordinated in right of payment to the prior payment in
full, in cash, junior securities, or other payment satisfactory to holders of
senior indebtedness, of all senior indebtedness.

    In the event of any acceleration of the notes because of an event of
default, the holders of any senior indebtedness then outstanding would be
entitled to payment in full, in cash, junior securities, or other payment
satisfactory to holders of senior indebtedness, of all obligations in respect to
such senior indebtedness before the holders of notes are entitled to receive any
payment of other distribution. We are required promptly to notify holders of
senior indebtedness if payment of the notes is accelerated because of an event
of default.

    We also may not make any payment on the notes if:

    - a default in the payment of designated senior indebtedness occurs and is
      continuing beyond any applicable period of grace, or

                                       25
<PAGE>
    - any other default occurs and is continuing with respect to designated
      senior indebtedness that permits holders of the designated senior
      indebtedness to accelerate its maturity and the trustee receives a notice
      of such default, which we refer to as a payment blockage notice, from us
      or any other person permitted to give this notice under the indenture.

    We may resume making payments on the notes:

    - in the case of a payment default, when the default is cured or waived or
      ceases to exist, and

    - in the case of any other default, the earlier of when the default is cured
      or waived or ceases to exist or 179 days after receipt of the payment
      blockage notice.

    No new period of payment blockage may be commenced pursuant to a payment
blockage notice unless and until 365 days have elapsed since our receipt of the
prior payment blockage notice.

    No default that existed on the date of delivery of any payment blockage
notice to the trustee shall be the basis for a subsequent payment blockage
notice.

    By reason of the subordination provisions described above, in the event of
our bankruptcy, dissolution or reorganization, holders of senior indebtedness
may receive more, ratably, and holders of the notes may receive less, ratably,
than our other creditors. These subordination provisions will not prevent the
occurrence of any event of default under the indenture. We are not limited or
prohibited from incurring additional senior indebtedness under the indenture.

    A portion of our operations are conducted through our subsidiaries. As a
result, our cash flow and our ability to service our debt, including the notes,
is dependent upon the earnings of our subsidiaries.

    Our subsidiaries are separate and distinct legal entities. Our subsidiaries
have no obligation to pay any amounts due on the notes or to provide us with
funds for our payment obligations, whether by dividends, distributions, loans or
other payments. In addition, any payment of dividends, distributions, loans or
advances by our subsidiaries to us could be subject to statutory or contractual
restrictions.

    Our right to receive any assets of any of our subsidiaries upon their
liquidation or reorganization, and therefore the right of the holders of the
notes to participate in those assets, will be effectively subordinated to the
claims of that subsidiary's creditors, including trade creditors and the
interests of such subsidiary's preferred stockholders. In addition, even if we
were a creditor of any of our subsidiaries, our rights as a creditor would be
subordinate to any security interest in the assets of our subsidiaries in favor
of indebtedness ranking senior or equal to the notes in right of payment, and
any indebtedness of our subsidiaries senior to that held by us.

    As of August 31, 2000, we had no senior indebtedness outstanding and our
subsidiaries had approximately $3,400 of outstanding liabilities.

DEFINITIONS OF SENIOR INDEBTEDNESS, INDEBTEDNESS, JUNIOR SECURITIES AND
DESIGNATED SENIOR INDEBTEDNESS

    "DESIGNATED SENIOR INDEBTEDNESS" means senior indebtedness under the loan
agreement and the trade credit agreement and our obligations under any
particular senior indebtedness that expressly provides that such senior
indebtedness is "designated senior indebtedness" for purposes of the indenture.

    "INDEBTEDNESS" means:

    (1) all of our indebtedness, obligations and other liabilities, contingent
       or otherwise, for borrowed money, including:

       - overdrafts, foreign exchange contracts, currency exchange agreements,
         interest rate protection agreements, and any loans or advances from
         banks, whether or not evidenced by notes or similar instruments,

                                       26
<PAGE>
       - evidenced by bonds, debentures, notes or similar instruments, whether
         or not the recourse of the lender is to all of our assets or to only a
         portion thereof, other than any account payable or other accrued
         current liability or obligation incurred in the ordinary course of
         business in connection with the obtaining of materials or services,

    (2) all of our reimbursement obligations and other liabilities, contingent
       or otherwise, with respect to letters of credit, bank guarantees or
       bankers' acceptances,

    (3) all of our obligations and liabilities, contingent or otherwise, in
       respect of leases required, in conformity with generally accepted
       accounting principles, to be accounted for as capitalized lease
       obligations on our balance sheet, or under other leases for facilities
       equipment or related assets, whether or not capitalized, entered into or
       leased for financing purposes, as determined by SST,

    (4) all of our obligations and other liabilities, contingent or otherwise,
       or under any lease or related document, including a purchase agreement,
       in connection with the lease of real property or improvements which
       provides that we are contractually obligated to purchase or cause a third
       party to purchase the leased property and thereby guarantee a minimum
       residual value of leased property to the lessor and all of our
       obligations under such lease or related document to purchase or to cause
       a third party to purchase the leased property,

    (5) all of our obligations, contingent or otherwise, with respect to an
       interest rate, currency or other swap, cap, floor or collar agreement,
       hedge agreement, forward contract, or other similar instrument or
       agreement or foreign currency hedge, exchange, purchase or similar
       instrument or agreement,

    (6) all of our direct or indirect guaranties or similar agreements to
       purchase or otherwise acquire or otherwise assure a creditor against loss
       in respect of, indebtedness, obligations or liabilities of another person
       of the kind described in clauses (1) through (5),

    (7) any indebtedness or other obligations described in clauses (1) through
       (6) secured by any mortgage, pledge, lien or other encumbrance existing
       on property which is owned or held by us, regardless of whether the
       indebtedness or other obligation secured thereby has been assumed by us,
       and

    (8) any and all refinancings, replacements, deferrals, renewals, extensions
       and refundings of, or amendments, modifications or supplements to, any
       indebtedness, obligation or liability of the kind described in
       clauses (1) through (7).

    "JUNIOR SECURITIES" means any capital stock and any indebtedness that is
subordinated in right of payment to the notes and has no scheduled installment
of principal due, by redemption, sinking fund payment, or otherwise on or prior
to the maturity of the notes.

    "LOAN AGREEMENT" means the loan and security agreement, dated as of
September 22, 1998, as amended, between SST and Foothill Capital Corporation.

    "SENIOR INDEBTEDNESS" means the principal of, premium, if any, interest,
including all interest accruing subsequent to the commencement of any bankruptcy
or similar proceeding, whether or not a claim for post-petition interest is
allowable as a claim in any such proceeding, and rent payable on or in
connection with, and all fees, costs, expenses and other amounts accrued or due
on or in connection with, indebtedness of SST, whether outstanding on the date
of the indenture or thereafter created, incurred, assumed or guaranteed by SST,
including all refinancings, replacements, deferrals, renewals, extensions or
refundings of, or amendments, modifications or supplements to, the foregoing,
unless in the case of any particular indebtedness the instrument creating or
evidencing the same or the assumption or guarantee thereof expressly provides
that such indebtedness shall not be senior in right

                                       27
<PAGE>
of payment to the notes or expressly provides that such indebtedness is on the
same basis or junior to the notes.

    "TRADE CREDIT AGREEMENT" means the trade credit agreement, dated as of
July 20, 2000, between SST and Union Bank of California, N.A.

    Senior indebtedness does not include any indebtedness of SST to any
subsidiary of SST.

OPTIONAL REDEMPTIONS BY SST

    PROVISIONAL REDEMPTION

    We may redeem the notes, in whole or in part, at any time prior to       ,
2003, at a redemption price equal to $1,000 per $1,000 principal amount of notes
to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the
redemption date if the closing price of our common stock has exceeded 150% of
the conversion price then in effect, as determined based on the then effective
conversion rate, for at least 20 trading days within a period of 30 consecutive
trading days ending on the trading day prior to the date of mailing of the
redemption notice, which date shall be not less than 30 nor more than 60 days
prior to the redemption date.

    Upon any provisional redemption, we will make an additional "make-whole"
payment in cash with respect to the notes called for redemption to holders on
the notice date in an amount equal to $      per $1,000 principal amount of
notes, less the amount of any interest actually paid per $1,000 principal amount
of notes prior to the redemption date. We will be obligated to make this
make-whole payment on all notes called for redemption, including any notes
converted after the notice date and before the redemption date.

OTHER OPTIONAL REDEMPTION

    We may, at our option, redeem the notes on or after       , 2003, in whole
or in part, on at least 20 days and no more than 60 days notice to the holder of
the notes at the following redemption prices expressed as percentages of the
principal amount:

<TABLE>
<CAPTION>
PERIOD                                                        REDEMPTION PRICE
------                                                        ----------------
<S>                                                           <C>
through            .........................................             %
through            .........................................             %
through            .........................................             %
and thereafter      ........................................       100.00%
</TABLE>

    In each case, we will pay accrued interest to, but excluding, the redemption
date. If the redemption date is an interest payment date, interest will be paid
to the record holder on the relevant record date.

    If fewer than all of the notes are to be redeemed, the trustee will select
the notes to be redeemed by lot, or in its discretion, on a PRO RATA basis. If
any note is to be redeemed in part only, a new note in principal amount equal to
the unredeemed principal portion will be issued. If a portion of your notes is
selected for partial redemption and you convert a portion of your notes, the
converted portion will be deemed to be of the portion selected for redemption.

    No sinking fund is provided for the notes.

PURCHASE OF NOTES AT YOUR OPTION UPON A CHANGE IN CONTROL

    If a change in control occurs, you will have the right to require us to
purchase all or any part of your notes 30 business days after the occurrence of
a change in control at a purchase price equal to

                                       28
<PAGE>
100% of the principal amount of the notes plus accrued and unpaid interest to,
but excluding, the purchase date. Notes submitted for purchase must be in $1,000
or multiples of $1,000 principal amount.

    We shall mail to the trustee and to each holder a written notice of the
change in control within 10 business days after the occurrence of a change in
control. This notice shall state:

    - the terms and conditions of the change in control;

    - the procedures required for exercise of the change in control; and

    - the holder's right to require SST to purchase the notes.

    You must deliver written notice of your exercise of this purchase right to a
paying agent at any time prior to the close of business on the business day
prior to the change in control purchase date. The written notice must specify
the notes for which the purchase right is being exercised. If you wish to
withdraw this election, you must provide a written notice of withdrawal to the
paying agent at any time prior to the close of business on the business day
prior to the change in control purchase date.

    A change in control will be deemed to have occurred if any of the following
occurs:

    - any "person" or "group" is or becomes the "beneficial owner," directly or
      indirectly, of shares of our voting stock representing 50% or more of the
      total voting power of all outstanding classes of our voting stock or has
      the power, directly or indirectly, to elect a majority of the members of
      our board of directors;

    - we consolidate with, or merge with or into, another person or we sell,
      assign, convey, transfer, lease or otherwise dispose of all or
      substantially all of our assets or any person consolidates with, or merges
      with or into us, in any such event other than pursuant to a transaction in
      which the persons that "beneficially owned," directly or indirectly,
      shares of our voting stock immediately prior to such transaction
      "beneficially own," directly or indirectly, shares of our voting stock
      representing at least a majority of the total voting power of all
      outstanding classes of voting stock of the surviving or transferee person;
      or

    - our company is dissolved or liquidated.

    However, a change in control will not be deemed to have occurred if either:

    - the last sale price of our common stock for any five trading days during
      the ten trading days immediately preceding the change in control is at
      least equal to 105% of the conversion price in effect on such day; or

    - in the case of a merger or consolidation, all of the consideration,
      excluding cash payments for fractional shares and cash payments made
      pursuant to dissenters' appraisal rights, in the merger or consolidation
      constituting the change in control consists of common stock traded on a
      United States national securities exchange or quoted on the Nasdaq
      National Market (or which will be so traded or quoted when issued or
      exchanged in connection with such change in control) and as a result of
      such transaction or transactions the notes become convertible solely into
      such common stock.

    For purposes of this change in control definition:

    - "person" or "group" have the meanings given to them for purposes of
      Sections 13(d) and 14(d) of the Exchange Act or any successor provisions,
      and the term "group" includes any group acting for the purpose of
      acquiring, holding or disposing or securities within the meaning of
      Rule 13d-5(b)(1) under the Exchange Act, or any successor provision;

    - a "beneficial owner" will be determined in accordance with Rule 13d-3
      under the Exchange Act, as in effect on the date of the indenture, except
      that the number of shares of voting stock of

                                       29
<PAGE>
      SST will be deemed to include, in addition to all outstanding shares of
      voting stock of SST and unissued shares deemed to be held by the "person"
      or "group" or other person with respect to which the change in control
      determination is being made, all unissued shares deemed to be held by all
      other persons;

    - "beneficially owned" has a meaning correlative to that of beneficial
      owner;

    - "unissued shares" means shares of voting stock not outstanding that are
      subject to options, warrants, rights to purchase or conversion privileges
      exercisable within 60 days of the date of determination of a change in
      control; and

    - "voting stock" means any class or classes of capital stock pursuant to
      which the holders of capital stock under ordinary circumstances have the
      power to vote in the election of the board of directors, managers or
      trustees of any person or other persons performing similar functions
      irrespective of, whether or not, at the time, capital stock of any other
      class or classes shall have, or might have, voting power by reason of the
      happening of any contingency.

    The term "all or substantially all" as used in the definition of change in
control will likely be interpreted under applicable state law and will be
dependent upon particular facts and circumstances. There may be a degree of
uncertainty in interpreting this phrase. As a result, we cannot assure you how a
court would interpret this phrase under applicable law if you elect to exercise
your rights following the occurrence of a transaction which you believe
constitutes a transfer of "all or substantially all of the assets."

    We will under the indenture:

    - comply with the provisions of Rule 13e-3, Rule 13e-4 and Rule 14e-1, if
      applicable, under the Exchange Act;

    - file a Schedule TO or any successor or similar schedule if required under
      the Exchange Act; and

    - otherwise comply with all federal and state securities laws in connection
      with any offer by us to purchase the notes upon a change in control.

    This change in control purchase feature may make more difficult or
discourage a takeover of SST and the removal of incumbent management. However,
we are not aware of any specific effort to accumulate shares of our common stock
or to obtain control of us by means of a merger, tender offer, solicitation or
otherwise. In addition, the change in control purchase feature is not part of a
plan by management to adopt a series of anti-takeover provisions. Instead, the
change in control purchase feature is a result of negotiations between us and
the underwriters.

    We could, in the future, enter into certain transactions, including
recapitalizations, that would not constitute a change in control but would
increase the amount of debt, including senior indebtedness, outstanding or
otherwise adversely affect a holder. Neither we nor our subsidiaries are
prohibited from incurring debt, including senior indebtedness, under the
indenture. The incurrence of significant amounts of additional debt could
adversely affect our ability to service our debt, including the notes.

    If a change in control were to occur, we may not have sufficient funds to
pay the change in control purchase price for the notes tendered by holders. In
addition, a change of control would result in an event of default under our
existing loan agreement and trade credit agreement. Our existing loan agreement
also prohibits, in certain situations, repurchase of the notes. Furthermore, we
may in the future incur debt that has similar change of control provisions that
permit holders of this debt to accelerate or require us to repurchase this debt
upon the occurrence of events similar to a change in control. If a change of
control occurs at a time when we are prohibited from repurchasing the notes, we
could seek the consent of our lenders to repurchase the notes or could attempt
to refinance this debt. If we do not obtain a consent or refinance the debt, we
could not repurchase the notes. Our

                                       30
<PAGE>
failure to repurchase the notes upon a change in control will result in an event
of default under the indenture, whether or not the purchase is permitted by the
subordination provisions of the indenture.

EVENTS OF DEFAULT

Each of the following will constitute an event of default under the indenture:

    (1) we fail to pay principal or premium, including any "make-whole" payment,
       if any, on any note when due, whether or not prohibited by the
       subordination provisions of the indenture;

    (2) we fail to pay any interest on any note when due if such failure
       continues for 30 days, whether or not prohibited by the subordination
       provisions of the indenture;

    (3) we fail to perform any other covenant required of us in the indenture if
       such failure continues for 60 days after notice is given in accordance
       with the indenture; or

    (4) certain events of bankruptcy, insolvency or reorganization of SST.

    If an event of default, other than an event of default described in
clause (4) above, occurs and is continuing, either the trustee or the holders of
at least 25% in aggregate principal amount of the outstanding notes may declare
the principal amount of the notes to be due and payable immediately. If an event
of default described in clause (4) above occurs, the principal amount of the
notes will automatically become immediately due and payable. Any payment by us
on the notes following any such acceleration will be subject to the
subordination provisions described above.

    After any such acceleration, but before a judgment or decree based on
acceleration, the holders of a majority in aggregate principal amount of the
notes may, under certain circumstances, rescind and annul such acceleration if
all events of default, other than the non-payment of accelerated principal, have
been cured or waived.

    Subject to the trustee's duties in the case of an event of default, the
trustee will not be obligated to exercise any of its rights or powers at the
request of the holders, unless the holders have offered to the trustee
reasonable indemnity. Subject to the trustee's indemnification, the holders of a
majority in aggregate principal amount of the outstanding notes will have the
right to direct the time, method and place of conducting any proceeding for any
remedy available to the trustee or exercising any trust or power conferred on
the trustee with respect to the notes.

    No holder will have any right to institute any proceeding under the
indenture, or for the appointment of a receiver or a trustee, or for any other
remedy under the indenture unless:

    - the holder has previously given to the trustee written notice of a
      continuing event of default;

    - the holders of at least 25% in aggregate principal amount of the
      outstanding notes have made a written request and have offered reasonable
      indemnity to the trustee to institute such proceeding as trustee; and

    - the trustee has failed to institute such proceeding, and has not received
      from the holders of a majority in aggregated principal amount of the
      outstanding notes a direction inconsistent with such request within
      60 days after such notice, request and offer.

    However, these limitations do not apply to a suit instituted by a holder for
the enforcement of payment of the principal of or any premium, including any
"make-whole" payment, or interest on any note or the right to convert the note
on or after the applicable due date.

                                       31
<PAGE>
    Generally, the holders of not less than a majority of the aggregate
principal amount of outstanding notes may waive any default or event of default
except if:

    - we fail to pay principal, premium, including any "make-whole" payment, or
      interest on any note when due;

    - we fail to convert any note into common stock; or

    - we fail to comply with any of the provisions of the indenture that would
      require the consent of the holder of each outstanding note affected.

    We are required to furnish to the trustee, on an annual basis, a statement
by our officers as to whether or not SST to the officer's knowledge, is in
default in the performance or observance of any of the terms, provisions and
conditions of the indenture, specifying any known defaults.

MODIFICATION AND WAIVER

    We and the trustee may make modifications and amendments to the indenture
with the consent of the holders of a majority in aggregate principal amount of
the outstanding notes.

    However, neither we nor the trustee may make any modification or amendment
without the consent of the holder of each outstanding note if such modification
or amendment would:

    - change the stated maturity of the principal of or interest on any note;

    - reduce the principal amount of, or any premium or interest on, any note;

    - reduce the amount of principal payable upon acceleration of the maturity
      of any note;

    - change the place or currency of payment of principal of, or any premium or
      interest on, any note;

    - impair the right to institute suit for the enforcement of any payment on,
      or with respect to, any note;

    - modify the subordination provisions in a manner materially adverse to the
      holders of notes;

    - adversely affect the right of holders to convert notes other than as
      provided in or under the indenture;

    - reduce the percentage in principal amount of outstanding notes required
      for modification or amendment of the indenture;

    - reduce the percentage in principal amount of outstanding notes necessary
      for waiver of compliance with certain provisions of the indenture or for
      waiver of certain defaults; or

    - modify such provisions with respect to modification and waiver.

CONSOLIDATION, MERGER AND SALE OF ASSETS

    We may not consolidate with or merge into any other person, in a transaction
in which we are not the surviving corporation, or convey, transfer or lease our
properties and assets substantially as an entirety to any successor person,
unless:

    - the successor person, if any, is a corporation, limited liability company,
      partnership, trust or other entity organized and existing under the laws
      of the United States, or any state of the United States or the District of
      Columbia, and, if other than us, assumes our obligations on the notes and
      under the indenture;

                                       32
<PAGE>
    - immediately after giving effect to the transaction, no default or event of
      default shall have occurred and be continuing; and

    - other conditions specified in the indenture are met.

SATISFACTION AND DISCHARGE

    We may discharge our obligations under the indenture while notes remain
outstanding if (1) all outstanding notes will become due and payable at their
scheduled maturity within one year or (2) all outstanding notes are scheduled
for redemption within one year, and, in either case, we have deposited with the
trustee an amount sufficient to pay and discharge all outstanding notes on the
date of their scheduled maturity or the scheduled date of redemption.

TRANSFER AND EXCHANGE

    We have initially appointed the trustee as security registrar, paying agent
and conversion agent, acting through its corporate trust office. We reserve the
right to:

    - vary or terminate the appointment of the security registrar, paying agent
      or conversion agent;

    - appoint additional paying agents or conversion agents; or

    - approve any change in the office through which any security registrar or
      any paying agent or conversion agent acts.

PURCHASE AND CANCELLATION

    All notes surrendered for payment, redemption, registration of transfer or
exchange or conversion shall if surrendered to any person other than the
trustee, be delivered to the trustee. All notes delivered to the trustee shall
be cancelled promptly by the trustee. No notes shall be authenticated in
exchange for any notes cancelled as provided in the indenture.

    We may, to the extent permitted by law, purchase notes in the open market or
by tender offer at any price or by private agreement. Any notes purchased by us
may, to the extent permitted by law, be reissued or resold or may, at our
option, be surrendered to the trustee for cancellation. Any notes surrendered
for cancellation may not be reissued or resold and will be promptly cancelled.

REPLACEMENT OF NOTES

    We will replace mutilated, destroyed, stolen or lost notes at your expense
upon delivery to the trustee of the mutilated notes, or evidence of the loss,
theft or destruction of the notes satisfactory to us and the trustee. In the
case of a lost, stolen or destroyed note, indemnity satisfactory to the trustee
and us may be required at the expense of the holder of such note before a
replacement note will be issued.

GOVERNING LAW

    The indenture and the notes will be governed by, and construed in accordance
with, the law of the State of New York, without regard to conflicts of laws
principles.

CONCERNING THE TRUSTEE

    Bank One Trust Company, N.A. has agreed to serve as the trustee under the
indenture. The trustee will be permitted to deal with SST and any affiliates of
SST with the same rights as if it were not trustee. However, under the Trust
Indenture Act, if the trustee acquires any conflicting interest and there exists
a default with respect to the notes, the trustee must eliminate such conflicts
or resign.

                                       33
<PAGE>
    The holders of a majority in principal amount of all outstanding notes will
have the right to direct the time, method and place of conducting any proceeding
for exercising any remedy or power available to the trustee. However, any such
direction may not conflict with any law or the indenture, may not be unduly
prejudicial to the rights of another holder or the trustee and may not involve
the trustee in personal liability.

BOOK-ENTRY, DELIVERY AND FORM

    We will initially issue the notes in the form of one or more global
securities. The global security will be deposited with the trustee as custodian
for DTC and registered in the name of a nominee of DTC. Except as set forth
below, the global security may be transferred, in whole and not in part, only to
DTC or another nominee of DTC. You may hold your beneficial interests in the
global security directly through DTC if you have an account with DTC or
indirectly through organizations which have accounts with DTC. Notes in
definitive certificated form, called "certificated securities," will be issued
only in certain limited circumstances described below.

    DTC had advised us that it is:

    - a limited purpose trust company organized under the laws of the State of
      New York;

    - a member of the Federal Reserve System;

    - a "clearing corporation" within the meaning of the New York Uniform
      Commercial Code; and

    - a "clearing agency" registered pursuant to the provisions of Section 17A
      of the Exchange Act.

    DTC was created to hold securities of institutions that have accounts with
DTC ,called "participants," and to facilitate the clearance and settlement of
securities transactions among its participants in such securities through
electronic book-entry changes in accounts of the participants, thereby
eliminating the need for physical movement of securities certificates. DTC's
participants include securities brokers and dealers, which may include the
underwriters, banks, trust companies, clearing corporations and certain other
organizations. Access to DTC's book-entry system is also available to others
such as banks, brokers, dealers and trust companies, called the "indirect
participants," that clear through or maintain a custodial relationship with a
participant, whether directly or indirectly.

    We expect that pursuant to procedures established by DTC, upon the deposit
of the global security with DTC, DTC will credit, on its book-entry registration
and transfer system, the principal amount of notes represented by such global
security to the accounts of participants. The accounts to be credited shall be
designated by the underwriters. Ownership of beneficial interests in the global
security will be limited to participants or persons that may hold interests
through participants. Ownership of beneficial interests in the global security
will be shown on, and the transfer of those ownership interests will be effected
only through, records maintained by DTC, with respect to participants'
interests, the participants and the indirect participants. The laws of some
jurisdictions may require that certain purchasers of securities take physical
delivery of such securities in definitive form. These limits and laws may impair
the ability to transfer or pledge beneficial interests in the global security.

    Beneficial owners of interests in global securities who desire to convert
their interests into common stock should contact their brokers or other
participants or indirect participants through whom they hold such beneficial
interests to obtain information on procedures, including proper forms and
cut-off times, for submitting requests for conversion.

    So long as DTC, or its nominee, is the registered owner or holder of a
global security, DTC or its nominee, as the case may be, will be considered the
sole owner or holder of the notes represented by the global security for all
purposes under the indenture and the notes. In addition, no beneficial owner of
an interest in a global security will be able to transfer that interest except
in accordance with the

                                       34
<PAGE>
applicable procedures of DTC. Except as set forth below, as an owner of a
beneficial interest in the global security, you will not be entitled to have the
notes represented by the global security registered in your name, will not
receive or be entitled to receive physical delivery of certificated securities
and will not be considered to be the owner or holder of any notes under the
global security. We understand that under existing industry practice, if an
owner of a beneficial interest in the global security desires to take any action
that DTC, as the holder of the global security, is entitled to take, DTC would
authorize the participants to take such action, and the participants would
authorize beneficial owners owning through such participants to take such action
or would otherwise act upon the instructions of beneficial owners owning through
them.

    We will make payments of principal of, premium, if any, and interest on the
notes represented by the global security registered in the name of and held by
DTC or its nominee to DTC or its nominee, as the case may be, as the registered
owner and holder of the global security. Neither we, the trustee nor any paying
agent will have any responsibility or liability for any aspect of the records
relating to or payments made on account of beneficial ownership interests in the
global security or for maintaining, supervising or reviewing any records
relating to such beneficial ownership interests.

    We expect that DTC or its nominee, upon receipt of any payment of principal
of, premium, if any, or interest on the global security, will credit
participants' accounts with payments in amounts proportionate to their
respective beneficial interests in the principal amount of the global security
as shown on the records of DTC or its nominee. We also expect that payments by
participants or indirect participants to owners of beneficial interests in the
global security held through such participants or indirect participants will be
governed by standing instructions and customary practices and will be the
responsibility of such participants or indirect participants. We will not have
any responsibility or liability for any aspect of the records relating to, or
payments made on account of, beneficial ownership interests in the global
security for any note or for maintaining, supervising or reviewing any records
relating to such beneficial ownership interests or for any other aspect of the
relationship between DTC and its participants or indirect participants or the
relationship between such participants or indirect participants and the owners
of beneficial interests in the global security owning through such participants.

    Transfers between participants in DTC will be effected in the ordinary way
in accordance with DTC rules and will be settled in same-day funds. DTC has
advised us that it will take any action permitted to be taken by a holder of
notes only at the direction of one or more participants to whose account the DTC
interests in the global security is credited and only in respect of such portion
of the aggregate principal amount of notes as to which such participant or
participants has or have given such direction. However, if DTC notifies us that
they are unwilling to be a depository for the global security or ceases to be a
clearing agency or there is an event of default under the notes, DTC will
exchange the global security for certificated securities which it will
distribute to its participants.

    Although DTC is expected to follow the foregoing procedures in order to
facilitate transfers of interests in the global security among participants of
DTC, they are under no obligation to perform or continue to perform such
procedures, and such procedures may be discontinued at any time. Neither we nor
the trustee will have any responsibility or liability for the performance by DTC
or the participants or indirect participants of their respective obligations
under the rules and procedures governing their respective operations.

                                       35
<PAGE>
DEDUCTIBILITY OF INTEREST

    Generally, under Section 279 of the Internal Revenue Code, an interest
deduction in excess of $5.0 million per year is not permitted with respect to
certain "corporate acquisition indebtedness." Corporate acquisition indebtedness
includes any indebtedness that is:

    - issued to provide consideration for the direct or indirect acquisition of
      stock or assets of another corporation;

    - subordinated;

    - convertible directly or indirectly into the stock of the issuing
      corporation; and

    - issued by a corporation that has a debt to equity ratio that exceeds 2 to
      1.

    Our ability to deduct all of the interest payable on the notes will depend
on the application of the foregoing tests to us. The availability of an interest
deduction with respect to the notes was not determinative in our issuance of the
notes pursuant to this offering.

    Under Section 163(l) of the Internal Revenue Code, no deduction is permitted
for interest paid or accrued on any indebtedness of a corporation that is
"payable in equity" of the issuer or a related party. Debt is treated as debt
payable in equity of the issuer if the debt is part of an arrangement designed
to result in payment of the instrument with or by reference to the equity. Such
arrangements could include debt instruments that are convertible at the holder's
option if it is reasonably expected that the option will be exercised. The
legislative history indicates that it is not expected the provision will affect
debt with a conversion feature where the conversion price is significantly
higher than the market price of the stock on the date of the debt issuance.
Accordingly, we do not believe that our interest deduction with respect to
interest payments on the notes will be adversely affected by these rules.

                                       36
<PAGE>
            CERTAIN UNITED STATES FEDERAL INCOME TAX CONSIDERATIONS


    This section summarizes some of the U.S. federal income tax considerations
relating to the purchase, ownership, and disposition of the notes and of common
stock into which the notes may be converted. This summary does not provide a
complete analysis of all potential tax considerations. While the information
provided below is based on existing authorities, these authorities may change,
or the Internal Revenue Service, called the "IRS," might interpret the existing
authorities differently. In either case, the tax consequences of purchasing,
owning or disposing of notes or common stock could differ from those described
below. We have not sought any ruling from the IRS of an opinion of counsel with
respect to the statements made and the conclusions reached. Except as
specifically discussed below, this summary applies only to "U.S. Holders" that
purchase notes in the initial offering at their "issue price," as defined in
Section 1273 of the Internal Revenue Code, and hold the notes or common stock as
"capital assets," generally, for investment. For this purpose, U.S, Holders
include citizens or residents of the United States and corporations,
partnerships, unless the Treasury Regulations provide otherwise, or other
entities organized under the laws of the United States or any state. For U.S.
federal income tax purposes, income earned through a foreign or domestic
partnership or similar entity is attributed to its owners. Trusts are U.S.
Holders if they are subject to the primary supervision of a U.S. court and the
control of one of more U.S. persons or if they validly elect to be treated as
U.S. persons. Special rules apply to nonresident alien individuals and foreign
corporations or trusts, called "Non-U.S. Holders." This summary describes some,
but not all, of these special rules. The summary generally does not address tax
considerations that may be relevant to particular investors because of their
specific circumstances, or because they are subject to special rules such as:


    - banks or other financial institutions;

    - holders subject to the alternative minimum tax;

    - tax-exempt organizations;

    - insurance companies;

    - regulated investment companies;

    - foreign persons or entities, except to the extent specifically set forth
      below;

    - dealers in securities, commodities or currencies;

    - holders whose "functional currency" is not the U.S. dollar;

    - persons that will hold notes as a position in a hedging transaction,
      "straddle" or "conversion transaction" for tax purposes; or

    - persons deemed to sell notes or common stock under the constructive sale
      provisions of the Internal Revenue Code.

    Finally, this summary does not describe the effect of the federal estate and
gift tax laws on U.S. Holders or the effects of any applicable foreign, state,
or local laws, except as set forth with respect to non-U.S. Holders.

    INVESTORS CONSIDERING THE PURCHASE OF NOTES SHOULD CONSULT THEIR OWN TAX
ADVISORS REGARDING THE APPLICATION OF THE U.S. FEDERAL INCOME TAX LAWS TO THEIR
PARTICULAR SITUATIONS AND THE CONSEQUENCES OF FEDERAL ESTATE OR GIFT TAX LAWS,
FOREIGN, STATE, OR LOCAL LAWS, AND TAX TREATIES.

                                       37
<PAGE>
U.S. HOLDERS

    TAXATION OF INTEREST

    U.S. Holders will be required to recognize as ordinary income any interest
paid or accrued on the notes, in accordance with their regular method of
accounting.

    In general, if the terms of a debt instrument entitle a holder to receive
payments other than fixed periodic interest that exceed the issue price of the
instrument, the holder may be required to recognize additional interest as
"original issue discount" over the term of the instrument. If the amount or
timing of any additional payments on a note is contingent, the note could be
subject to special rules that apply to contingent debt instruments. These rules
generally require a holder to accrue interest income at a rate higher than the
stated interest rate on the note and to treat as ordinary income, rather than
capital gain, any gain recognized on a sale, exchange or retirement of a note
before the resolution of the contingencies. If we call the notes for optional
redemption, see "Description of the Notes--Optional Redemptions by SST,"
investors would be entitled to receive a payment in excess of stated principal
and interest, either upon the redemption or upon a conversion of the notes after
they are called for redemption but before they are actually redeemed. We do not
believe that the notes could be treated as contingent debt instruments because
of these potential additional payments. Therefore, for purposes of filing tax or
information returns with the IRS, we will not treat the notes as contingent debt
instruments or as having original issue discount. Because of the lack of
authority on point, the tax consequences of the additional payments are
uncertain. The notes could be treated as contingent debt instruments with the
consequences described above. If the notes are not treated as contingent debt
instruments, so that the potential receipt of the additional payments does not
affect the accrual of interest, the holders could still be required to recognize
income or gain upon receipt of a contingent payment. In general, a premium paid
in cash on a redemption of the notes would probably be treated as capital gain
in accordance with the rules described in the following paragraph.

    SALE, EXCHANGE OR REDEMPTION OF THE NOTES

    A U.S. Holder will generally recognize capital gain or loss if the holder
disposes of a note in a sale, redemption or exchange other than a conversion of
the note into common stock. The holder's gain or loss will equal the difference
between the proceeds received by the holder and the holder's adjusted tax basis
in the note. The proceeds received by the holder will include the amount of any
cash and the fair market value of any other property received for the note. The
holder's tax basis in the note will generally equal the amount the holder paid
for the note reduced by any amortizable note premium used to offset qualified
stated interest. The gain or loss recognized by a holder on a disposition of the
note will be long-term capital gain or loss if the holder held the note for more
than one year. Long-term capital gains of individual taxpayers are generally
taxed at a maximum federal rate of 20 percent. The deductibility of capital
losses is subject to limitation.

    The portion of any proceeds that is attributable to accrued interest will
not be taken into account in computing the holder's capital gain or loss.
Instead, that portion will be recognized as ordinary interest income to the
extent that the holder has not previously included the accrued interest in
income.

    CONVERSION OF THE NOTES

    A U.S. Holder generally will not recognize any income, gain or loss on
converting a note into common stock. If the holder receives cash in lieu of a
fractional share of stock, however, the holder would be treated as if he
received the fractional share and then had the fractional share redeemed for the
cash. The holder would recognize capital gain or loss equal to the difference
between the cash received and that portion of his basis in the stock
attributable to the fractional share. The holder's aggregate basis in the common
stock will equal his adjusted basis in the note. The holder's holding

                                       38
<PAGE>
period for the stock will include the period during which he held the note. As
noted above, if a holder converts a note after it has been called for optional
redemption, the tax consequences of the additional payment that the holder would
receive are unclear. The holder could be required to recognize income or gain on
the receipt of the additional payment.

    DIVIDENDS

    If, after a U.S. Holder converts a note into common stock, we make a
distribution in respect of that stock, the distribution will be treated as a
dividend, taxable to the U.S. Holder as ordinary income, to the extent it is
paid from our current or accumulated earnings and profits. If the distribution
exceeds our current and accumulated profits, the excess will be treated first as
a tax-free return of the holder's investment, up to the holder's basis in his
common stock. Any remaining excess will be treated as capital gain. If the U.S.
Holder is a U.S. corporation, it would generally be able to claim a deduction
equal to a portion of any dividends received.

    The terms of the notes allow for changes in the conversion price of the
notes in certain circumstances. A change in conversion price that allows
noteholders to receive more shares of common stock on conversion may increase
the noteholders' proportionate interest in our earnings and profits or assets.
In that case, noteholders would be treated as though they received a dividend in
the form of our stock. Such a constructive stock dividend would be taxable to
the noteholders even though they would not actually receive any cash or other
property. A taxable constructive stock dividend would result, for example, if
the conversion price is adjusted to compensate noteholders for distributions of
cash or property to our shareholders.

    Not all changes in conversion price that allow noteholders to receive more
stock on conversion, however, increase the noteholders' proportionate interests
in SST. For instance, a change in conversion price could simply prevent the
dilution of the noteholders' interests upon a stock split or other change in
capital structure. Changes of this type, if made by a bona fide, reasonable
adjustment formula, are not treated as constructive stock dividends. Conversely,
if an event occurs that dilutes the noteholders' interests and the conversion
price is not adjusted, the resulting increase in the proportionate interests of
our shareholders could be treated as a taxable stock dividend to them. Any
taxable constructive stock dividends resulting from a change to, or failure to
change, the conversion price would be treated like dividends paid in cash or
other property. They would result in ordinary income to the recipient, to the
extent of our current or accumulated earnings and profits, with any excess
treated as a tax-free return of capital or as capital gain.

    SALE OF COMMON STOCK

    A U.S. Holder will generally recognize capital gain or loss on a sale or
exchange of common stock. The holder's gain or loss will equal the difference
between the proceeds received by the holder and the holder's adjusted tax basis
in the stock. The proceeds received by the holder will include the amount of any
cash and the fair market value of any other property received for the stock. The
gain or loss recognized by a holder on a sale or exchange of stock will be
long-term capital gain or loss if the holder held the stock for more than one
year.

SPECIAL TAX RULES APPLICABLE TO NON-U.S. HOLDERS

    TAXATION OF INTEREST

    Payments of interest to nonresident persons or entities are generally
subject to U.S. federal income tax at a rate of 30 percent, collected by means
of withholding by the payor. Payments of interest on the notes to most Non-U.S.
Holders, however, will qualify as "portfolio interest," and thus will be exempt
from the withholding tax, if the holders certify their nonresident status as
described below. The portfolio interest exception will not apply to payments of
interest to a Non-U.S. Holder that

                                       39
<PAGE>
    - owns, directly or indirectly, at least 10 percent of our voting stock, or

    - is a "controlled foreign corporation" that is related to us.

    In general, a foreign corporation is a controlled foreign corporation if at
least 50 percent of its stock is owned, directly or indirectly, by one or more
U.S. persons that each owns, directly or indirectly, at least 10 percent of the
corporation's voting stock.

    The portfolio interest exception and several of the special rules for
Non-U.S. Holders described below apply only if the holder certifies its
nonresident status. A Non-U.S. Holder can meet this certification requirement by
providing a Form W-8BEN or appropriate substitute form to us, or our paying
agent. If the holder holds the note through a financial institution or other
agent acting on the holder's behalf, the holder will be required to provide
appropriate documentation to the agent. The holder's agent will then be required
to provide certification to us or our paying agent, either directly or through
other intermediaries. For payments made to a foreign partnership after
December 31, 2000, the certification requirements generally apply to the
partners rather than the partnership.

    Although payments of interest on the notes will generally be exempt from
withholding tax as described above, we intend to withhold on "make-whole"
payments made upon conversion to Non-U.S. Holders. See "Conversion of the Notes"
below.

    SALE, EXCHANGE OR REDEMPTION OF NOTES

    Non-U.S. Holders generally will not be subject to U.S. federal income tax on
any gain realized on the sale, exchange, or other disposition of notes. This
general rule, however, is subject to several exceptions. For example, the gain
would be subject to U.S. federal income tax if

    - the gain is effectively connected with the conduct by the Non-U.S. Holder
      of a U.S. trade or business,

    - the Non-U.S. Holder was a citizen or resident of the United States and
      thus is subject to special rules that apply to expatriates, or

    - the rules of the Foreign Investment in Real Property Tax Act, called
      "FIRPTA" and described below, treat the gain as effectively connected with
      a U.S. trade or business.

    The FIRPTA rules may apply to a sale, exchange or other disposition of notes
if we are, or were within five years before the transaction, a "U.S. real
property holding corporation" or "USRPHC." In general, we would be a USRPHC if
interests in U.S. real estate comprised most of our assets. We do not believe
that we are a USRPHC or that we will become one in the future. The FIRPTA rules
would apply to a disposition of notes by a Non-U.S. Holder only if the holder
owned, directly or indirectly, more than 5 percent of our common stock within
five years before the holder's disposition of the notes and if the common stock
was not regularly traded, as defined in the applicable treasury regulations, on
an established securities market. For this purpose, the Non-U.S. Holder would be
treated as owning the stock that the holder could acquire on conversion of the
holder's notes. If all of these conditions were met, and the FIRPTA rules
applied to the sale, exchange, or other disposition of notes by a Non-U.S.
Holder, then any gain recognized by the holder would be treated as effectively
connected with a U.S. trade or business, and would thus be subject to U.S.
federal income tax.

    CONVERSION OF THE NOTES

    A Non-U.S. Holder generally will not recognize any income, gain or loss on
converting a note into common stock. Any gain recognized as a result of the
holder's receipt of cash in lieu of a fractional share of stock would also
generally not be subject to U.S. federal income tax. See "Special Tax Rules
Applicable to Non-U.S. Holders--Sale of Common Stock," below. A holder could be
subject to U.S. federal income tax, however, on any "make-whole" payment
received upon conversion. We intend to

                                       40
<PAGE>
withhold tax from any such payment. If the payment were determined not to be
subject to U.S. federal income tax, a Non-U.S. Holder would be entitled to a
refund of the tax withheld.

    DIVIDENDS

    Dividends paid to a Non-U.S. Holder on common stock received on conversion
of a note will generally be subject to U.S. withholding tax at a 30 percent
rate. The withholding tax might not apply, however, or might apply at a reduced
rate, under the terms of a tax treaty between the United States and the Non-U.S.
Holder's country of residence. A Non-U.S. Holder must demonstrate its
entitlement to treaty benefits by certifying its nonresident status. Some of the
common means of meeting this requirement are described above under "Special Tax
Rules Applicable to Non-U.S. Holders--Taxation of Interest."

    SALE OF COMMON STOCK

    Non-U.S. Holders will generally not be subject to U.S. federal income tax on
any gains realized on the sale, exchange, or other disposition of common stock.
This general rule, however, is subject to exceptions, one of which is described
under "Special Tax Rules Applicable to Non-U.S. Holders--Sale, Exchange or
Redemption of Notes."

    INCOME OR GAINS EFFECTIVELY CONNECTED WITH A U.S. TRADE OR BUSINESS

    The preceding discussion of the tax consequences of the purchase, ownership
or disposition of notes or common stock by a Non-U.S. Holder assumes that the
holder is not engaged in a U.S. trade or business. If any interest on the notes,
dividends on common stock, or gain from the sale, exchange or other disposition
of the notes or stock is effectively connected with a U.S. trade or business
conducted by the Non-U.S. Holder, then the income or gain will be subject to
U.S. federal income tax at the regular graduated rates. If the Non-U.S. Holder
is eligible for the benefits of a tax treaty between the United States and the
holder's country of residence, any "effectively connected" income or gain will
be subject to U.S. federal income tax only if it is also attributable to a
permanent establishment maintained by the holder in the United States. Payments
of dividends that are effectively connected with a U.S. trade or business, and
therefore included in the gross income of a Non-U.S. Holder, will not be subject
to the 30 percent withholding tax. To claim exemption from withholding, the
holder must certify its qualification, which can be done by filing a
Form W-8ECI. If the Non-U.S. Holder is a corporation, that portion of its
earnings and profits that are effectively connected with its U.S. trade or
business would generally be subject to a "branch profits tax." The branch
profits tax rate is generally 30 percent, although an applicable tax treaty
might provide for a lower rate.

    U.S. FEDERAL ESTATE TAX

    The estates of nonresident alien individuals are subject to U.S. federal
estate tax on property with a U.S. situs. The notes will not be U.S. situs
property as long as interest on the notes paid immediately before the death of
the holder would have qualified as portfolio interest, exempt from withholding
tax as described above under "Special Tax Rules Applicable to Non-U.S.
Holders--Taxation of Interest." Because we are a U.S. corporation, our common
stock will be U.S. situs property, and therefore will be included in the taxable
estate of a nonresident alien decedent. The U.S. federal estate tax liability of
the estate of a nonresident alien may be effected by a tax treaty between the
United States and the decedent's country of residence.

BACKUP WITHHOLDING AND INFORMATION REPORTING

    The Internal Revenue Code and the Treasury regulations require those who
make specified payments to report the payments to the IRS. Among the specified
payments are interest, dividends, and

                                       41
<PAGE>
proceeds paid by brokers to their customers. The required information returns
enable the IRS to determine whether the recipient properly included the payments
in income. This reporting regime is reinforced by "backup withholding" rules.
These rules require the payors to withhold tax at a 31 percent rate from
payments subject to information reporting if a recipient fails to cooperate with
the reporting regime by failing to provide his taxpayer identification number to
the payor, furnishing an incorrect identification number, or repeatedly failing
to report interest or dividends on his returns. The information reporting and
backup withholding rules do not apply to payments to corporations, whether
domestic or foreign.

    Payments of interest or dividends to individual U.S. Holders of notes or
common stock will generally be subject to information reporting, and will be
subject to backup withholding unless the holder provides us or our paying agent
with a correct taxpayer identification number.

    The information reporting and backup withholding rules do not apply to
payments that are subject to the 30 percent withholding tax on dividends or
interest paid to nonresidents, or to payments that are exempt from that tax by
application of a tax treaty or special exception. Therefore, payments of
dividends on common stock, or interest on notes, will generally not be subject
to information reporting or backup withholding. To avoid backup withholding on
dividends paid after December 31, 2000, a Non-U.S. Holder will have to certify
its nonresident status. Some of the common means of doing so are described under
"Special Rules Applicable to Non-U.S. Holders--Taxation of Interest."

    Payments made to U.S. Holders by a broker upon a sale of notes or common
stock will generally be subject to information reporting and backup withholding.
If, however, the sale is made through a foreign office of a U.S. broker, the
sale will be subject to information reporting but not backup withholding. If the
sale is made through a foreign office of a foreign broker, the sale will
generally not be subject to either information reporting or backup withholding.
This exception may not apply, however, if the foreign broker is owned or
controlled by U.S. persons, or is engaged in a U.S. trade or business.

    Payments made to Non-U.S. Holders by a broker upon a sale of notes or common
stock will not be subject to information reporting or backup withholding as long
as the Non-U.S. Holder certifies its foreign status.

    Any amounts withheld from a payment to a holder of notes or common stock
under the backup withholding rules can be credited against any U.S. federal
income tax liability of the holder.

    THE PRECEDING DISCUSSION OF CERTAIN U.S. FEDERAL INCOME TAX CONSIDERATIONS
IS FOR GENERAL INFORMATION ONLY. IT IS NOT TAX ADVICE. EACH PROSPECTIVE INVESTOR
SHOULD CONSULT ITS OWN TAX ADVISOR REGARDING THE PARTICULAR U.S. FEDERAL, STATE,
LOCAL, AND FOREIGN TAX CONSEQUENCES OF PURCHASING, HOLDING, AND DISPOSING OF OUR
NOTES OR COMMON STOCK, INCLUDING THE CONSEQUENCES OF ANY PROPOSED CHANGE IN
APPLICABLE LAWS.

OTHER TAX CONSEQUENCES

    MARKET DISCOUNT

    For holders other than initial holders, gain recognized upon the maturity or
earlier disposition of a note may be affected by the "market discount"
provisions of the Internal Revenue Code. For this purpose, the market discount
on the notes generally will be equal to the amount, if any, by which the stated
redemption price at maturity of the notes immediately after acquisition (other
than at original issue) exceeds the holder's adjusted tax basis in the notes.
Subject to a DE MINIMIS exception, these provisions generally require a U.S.
Holder who acquires notes at a market discount to treat as ordinary income any
gain recognized on the disposition of such notes to the extent of the "accrued
market

                                       42
<PAGE>
discount" on such notes at the time of disposition, unless the holder elects to
include accrued market discount in income currently. This election to include
market discount in income currently, once made, applies to all market discount
obligations acquired on or after the first taxable year to which the election
applies and may not be revoked without the consent of the IRS. In general,
market discount will be treated as accruing on a straight-line basis over the
remaining term of the notes at the time of acquisitions, or, at the election of
the holder, under a constant yield method. A U.S. Holder who acquires notes at a
market discount and who does not elect to include accrued market discount in
income currently may be required to defer the deduction of a portion of the
interest on any indebtedness incurred or maintained to purchase or carry the
notes until such notes are disposed of in a taxable transaction. If a holder
acquires notes with market discount and receives our common stock upon
conversion of such notes, the amount of accrued market discount not previously
included in income with respect to the converted notes through the date of
conversion will be treated as ordinary income upon the disposition of the common
stock.

    Under the President's recent budget proposal, accrual basis taxpayers could
be required to accrue market discount currently, subject to certain limitations.

    AMORTIZABLE PREMIUM

    A U.S. Holder who purchases a note at a premium over its stated principal
amount, plus accrued interest, generally may elect to amortize such premium,
called a "Section 171 premium," from the purchase date to the note's maturity
date under a constant-yield method that reflects semiannual compounding based on
the note's payment period. Amortizable premium, however, will not include any
premium attributable to a note conversion feature. The premium attributable to
the conversion feature is the excess, if any, of the note's purchase price over
what the note's fair market value would be if there were no conversion feature.
Amortized Section 171 premium is treated as an offset to interest income on a
note and not as a separate deduction. A U.S. Holder who elects to amortize the
note premium must reduce his tax basis in the note as described above under
"Sale, Exchange or Redemption of the Notes." The election to amortize a premium
on a constant yield method, once made, applies to all debt obligations held or
subsequently acquired by the electing U.S. Holder on or after the first day of
the first taxable year to which the election applies and may not be revoked
without the consent of the IRS.

                                       43
<PAGE>
                                  UNDERWRITING


    Under the terms and subject to the conditions contained in an underwriting
agreement, dated             , 2000, we have agreed to sell to the underwriters
named below, for whom Credit Suisse First Boston Corporation, Lehman Brothers
Inc. and Chase Securities Inc. are acting as representatives, the following
respective principal amounts of the notes:



<TABLE>
<CAPTION>
                                                              PRINCIPAL AMOUNT
UNDERWRITER                                                       OF NOTES
-----------                                                   ----------------
<S>                                                           <C>
Credit Suisse First Boston Corporation......................    $
Lehman Brothers Inc.........................................
Chase Securities Inc........................................

                                                                ------------
      Total.................................................    $150,000,000
                                                                ============
</TABLE>


    The underwriting agreement provides that the underwriters are obligated to
purchase all of the notes if any are purchased, other than those notes covered
by the over-allotment option described below. The underwriting agreement also
provides that if an underwriter defaults the purchase commitments of
non-defaulting underwriters may be increased or the offering may be terminated.

    We have granted to the underwriters a 30-day option to purchase on a pro
rata basis up to $22,500,000 additional principal amount of notes at the initial
public offering price less the underwriting discounts and commissions. The
option may be exercised only to cover any over-allotments in the sale of the
notes.

    The underwriters propose to offer the notes initially at the public offering
price on the cover page of this prospectus and to selling group members at that
price less a selling concession of    % of the principal amount per note. The
underwriters and selling group members may allow a discount of    % of the
principal amount per note on sales to other broker/dealers. After the initial
public offering, the public offering price and concession and discount to
broker/dealers may be changed by the representatives.

    The following table summarizes the compensation and estimated expenses we
will pay.

<TABLE>
<CAPTION>
                                                     PER NOTE                            TOTAL
                                          -------------------------------   -------------------------------
                                             WITHOUT            WITH           WITHOUT            WITH
                                          OVER-ALLOTMENT   OVER-ALLOTMENT   OVER-ALLOTMENT   OVER-ALLOTMENT
                                          --------------   --------------   --------------   --------------
<S>                                       <C>              <C>              <C>              <C>
Underwriting Discounts and Commissions
paid by SST.............................     $                $                $                $
Expenses payable by SST.................     $                $                $                $
</TABLE>

    The notes are a new issue of securities with no established trading market.
One or more of the underwriters intends to make a secondary market for the
notes. However, they are not obligated to do so and may discontinue making a
secondary market for the notes at any time without notice. No assurance can be
given as to how liquid the trading market for the notes will be.

    We have agreed that we will not offer, sell, contract to sell or otherwise
dispose of, directly or indirectly, or file with the Securities and Exchange
Commission a registration statement under the Securities Act relating to, any
additional debt securities, shares of our common stock, or securities
convertible into or exchangeable or exercisable for any shares of common stock,
or publicly disclose our intention to make any offer, sale, disposition or
filing, without the prior written consent of Credit

                                       44
<PAGE>
Suisse First Boston Corporation for a period of 90 days after the date of this
prospectus, except issuances pursuant to the exercise of employee stock options
and rights to purchase shares of our common stock under our employment benefit
plans and the sale of common stock in the concurrent common stock offering.

    Our officers and directors have agreed that they will not offer, sell,
contract to sell, pledge or otherwise dispose of, directly or indirectly, any
shares of our common stock or securities convertible into or exchangeable or
exercisable for any shares of our common stock, enter into a transaction which
would have the same effect, or enter any swap, hedge or other arrangement that
transfers, in whole or in part, any of the economic consequences of ownership of
our common stock, whether such aforementioned transaction is to be settled by
delivery of our common stock or such other securities, in cash or otherwise, or
publicly disclose the intention to make any such offer, sale, pledge or
disposition, or to enter into any such transaction, swap, hedge or other
arrangement, without, in each case, the prior written consent of Credit Suisse
First Boston Corporation for a period of 90 days after the date of this
prospectus, except that each of our officers and directors may sell up to 30,000
of their shares without consent.

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

    Our common stock is traded on the Nasdaq Stock Market's National Market
under the symbol "SSTI."

    In connection with the offering, the underwriters, may engage in stabilizing
transactions, over-allotment transactions, syndicate covering transactions,
penalty bids and passive market making in accordance with Regulation M under the
Securities Exchange Act of 1934.

    - Stabilizing transactions permit bids to purchase the underlying security
      so long as the stabilizing bids do not exceed a specified maximum.

    - Over-allotment involves sales by the underwriters of notes in excess of
      principal amount of the notes the underwriters are obligated to purchase,
      which creates a syndicate short position. The short position may be either
      a covered short position or a naked short position. In a covered short
      position, the principal amount of the notes over-allotted by the
      underwriters is not greater than the principal amount of the notes that
      they may purchase in the over-allotment option. In a naked short position,
      the principal amount of the notes involved is greater than the principal
      amount of the notes in the over-allotment option. The underwriters may
      close out any short position by either exercising their over-allotment
      option and/or purchase notes in the open market.

    - Syndicate covering transactions involve purchases of notes and common
      stock in the open market after the distribution has been completed in
      order to cover syndicate short positions. In determining the source of
      notes and common stock to close out the short position, the underwriters
      will consider, among other things, the price of notes and common stock
      available for purchase in the open market as compared to the price at
      which they may purchase notes through the over-allotment option. If the
      underwriters sell more notes than could be covered by the over-allotment
      option--a naked short position--that position can only be closed out by
      buying notes in the open market. A naked short position is more likely to
      be created if the underwriters are concerned that there may be downward
      pressure on the price of the notes and common stock in the open market
      after pricing that could adversely affect investors who purchase in the
      offering.

    - Penalty bids permit the representatives to reclaim a selling concession
      from a syndicate member when the notes originally sold by such syndicate
      member are purchased in a stabilizing transaction or a syndicate covering
      transaction to cover syndicate short positions.

                                       45
<PAGE>
    - In passive market making, market makers in the common stock who are
      underwriters or prospective underwriters may, subject to limitations, make
      bids for or purchases of the common stock until the time, if any, at which
      a stabilizing bid is made.

These stabilizing transactions, syndicate covering transactions and penalty bids
may have the effect of raising or maintaining the market price of the notes and
common stock or preventing or retarding a decline in the market price of the
notes and common stock. As a result the price of the notes and common stock may
be higher than the price that might otherwise exist in the open market. These
transactions, if commenced, may be discontinued at any time.

                                       46
<PAGE>
                          NOTICE TO CANADIAN RESIDENTS

RESALE RESTRICTIONS

    The distribution of the notes in Canada is being made only on a private
placement basis exempt from the requirement that we prepare and file a
prospectus with the securities regulatory authorities in each province where
trades of notes are made. Any resale of the notes in Canada must be made under
applicable securities laws which will vary depending on the relevant
jurisdiction, and which may require resales to be made under available statutory
exemptions or under a discretionary exemption granted by the applicable Canadian
securities regulatory authority. Purchasers are advised to seek legal advice
prior to any resale of the notes.

REPRESENTATIONS OF PURCHASERS

    By purchasing notes in Canada and accepting a purchase confirmation, a
purchaser is representing to us and the dealer from whom the purchase
confirmation is received that:

    - the purchaser is entitled under applicable provincial securities laws to
      purchase the notes without the benefit of a prospectus qualified under
      those securities laws,

    - where required by law, the purchaser is purchasing as principal and not as
      agent, and

    - the purchaser has reviewed the text above under "Resale Restrictions."

RIGHTS OF ACTION (ONTARIO PURCHASERS)

    The securities being offered are those of a foreign issuer and Ontario
purchasers will not receive the contractual right of action prescribed by
Ontario securities law. As a result, Ontario purchasers must rely on other
remedies that may be available, including common law rights of action for
damages or rescission or rights of action under the civil liability provisions
of the U.S. federal securities laws.

ENFORCEMENT OF LEGAL RIGHTS

    All of the issuer's directors and officers as well as the experts named
herein may be located outside of Canada and, as a result, it may not be possible
for Canadian purchasers to effect service of process within Canada upon the
issuer or such persons. All or a substantial portion of the assets of the issuer
and such persons may be located outside of Canada and, as a result, it may not
be possible to satisfy a judgment against the issuer or such persons in Canada
or to enforce a judgment obtained in Canadian courts against such issuer or
persons outside of Canada.

NOTICE TO BRITISH COLUMBIA RESIDENTS

    A purchaser of notes to whom the SECURITIES ACT (British Columbia) applies
is advised that the purchaser is required to file with the British Columbia
Securities Commission a report within ten days of the sale of any notes acquired
by the purchaser to this offering. The report must be in the form attached to
British Columbia Securities Commission Blanket Order BOR #95/17, a copy of which
may be obtained from us. Only one report must be filed for notes acquired on the
same date and under the same prospectus exemption.

TAXATION AND ELIGIBILITY FOR INVESTMENT

    Canadian purchasers of notes should consult their own legal and tax advisors
with respect to the tax consequences of an investment in the notes in their
particular circumstances and about the eligibility of the notes for investment
by the purchaser under relevant Canadian legislation.

                                       47
<PAGE>
                                 LEGAL MATTERS

    The validity of the securities being sold in this offering will be passed
upon for us by Cooley Godward LLP, Palo Alto, California. The underwriters have
been represented by Davis Polk & Wardwell, Menlo Park, California.

                                    EXPERTS

    The financial statements incorporated in this Prospectus by reference to the
Annual Report on Form 10-K for the year ended December 31, 1999, have been so
incorporated in reliance on the report of PricewaterhouseCoopers LLP,
independent accountants, given on the authority of said firm as experts in
auditing and accounting.

                      WHERE YOU CAN FIND MORE INFORMATION


    We have filed with the Securities and Exchange Commission a registration
statement, which term shall include any amendment to the registration statement,
on Form S-3 under the Securities Act of 1933 with respect to the convertible
subordinated notes offered by our company. This prospectus, which constitutes a
part of the registration statement, does not contain all of the information set
forth in the registration statement, some items of which are contained in
exhibits to the registration statement as permitted by the rules and regulations
of the SEC. We file proxy statements and annual, quarterly and special reports
and other information with the SEC. You can inspect and copy the registration
statement as well as the reports, proxy statements and other information we have
filed with the SEC without charge at the public reference facilities maintained
by the SEC in Room 1024, 450 Fifth Street, N.W., Washington, DC 20549, and the
SEC's regional offices located at the Northwestern Atrium Center, 500 West
Madison Street, Suite 1400, Chicago, Illinois 60661 and Seven World Trade
Center, 13th Floor, New York, New York 10048, and copies of all or any part of
the registration statement may be obtained from the SEC upon the payment of fees
prescribed by it. The SEC maintains a Web site at http://www.sec.gov that
contains reports, proxy and information statements and other information
regarding companies that file electronically with it. Our common stock is listed
on the Nasdaq National Market, and you may also inspect copies of these reports,
proxy statements and other information at the offices of The Nasdaq Stock
Market, 1735 K Street, N.W., Washington, DC 20006.


                                       48
<PAGE>
                     INFORMATION INCORPORATED BY REFERENCE

    The SEC allows us to "incorporate by reference" our publicly filed documents
into this prospectus, which means that we can disclose important information to
you by referring you to those documents. The information included in those
documents is considered part of this prospectus. Information in this prospectus
supersedes information incorporated by reference that we filed with the SEC
prior to the date of this prospectus, while information that we later file with
the SEC will automatically update and supersede this information. We incorporate
by reference the documents listed below and any future filings we will make with
the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act
of 1934.

    The following documents filed with the SEC are incorporated by reference in
this prospectus:

        1.  Our Annual Report on Form 10-K for the year ended December 31, 1999,
    filed with the SEC on February 24, 2000, as amended by our Amended Annual
    Report on Form 10-K/A for the year ended December 31, 1999, filed with the
    SEC on April 28, 2000.

        2.  Our Proxy Statement filed with the SEC on May 11, 2000.

        3.  Our Quarterly Report on Form 10-Q for the quarterly period ended
    March 31, 2000, filed with the SEC on May 15, 2000.

        4.  Our Quarterly Report on Form 10-Q for the quarterly period ended
    June 30, 2000, filed with the SEC on August 7, 2000.


        5.  Our Current Report on Form 8-K dated October 1, 2000, filed with the
    SEC on October 3, 2000.



        6.  The description of our common stock in our registration statement on
    Form 8-A filed with the SEC on October 5, 1995, including any amendments or
    reports filed for the purpose of updating such description.



        7.  All of the filings pursuant to the Securities Exchange Act after the
    date of filing of the original registration statement and prior to the
    effectiveness of the registration statement.


    We will furnish without charge to you, on written or oral request, a copy of
any or all of the documents incorporated by reference, other than exhibits to
those documents. You should direct any requests for documents to Investor
Relations, 1171 Sonora Court, Sunnyvale, California 94086,
telephone: (408) 735-9110.

                                       49
<PAGE>
                DISCLOSURE REGARDING FORWARD-LOOKING STATEMENTS

    This prospectus, including the documents that we incorporate by reference,
contains forward-looking statements within the meaning of Section 27A of the
Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934.
Any statements about our expectations, beliefs, plans, objectives, assumptions
or future events or performance are not historical facts and may be
forward-looking. These statements are often, but not always, made through the
use of words or phrases such as "anticipate," "estimate," "plans," "projects,"
"continuing," "ongoing," "expects," "management believes," "we believe," "we
intend" and similar words or phrases. Accordingly, these statements involve
estimates, assumptions and uncertainties which could cause actual results to
differ materially from those expressed in them. Any forward-looking statements
are qualified in their entirety by reference to the factors discussed throughout
this prospectus.

    Because the risk factors in this prospectus could cause actual results or
outcomes to differ materially from those expressed in any forward-looking
statements made by us, you should not place undue reliance on any such
forward-looking statements. 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 or statements to reflect events or circumstances after
the date on which such statement is made or to reflect the occurrence of
unanticipated events. New factors emerge from time to time, and it is not
possible for us to predict which will arise. In addition, we cannot assess the
impact of each factor on our business or the extent to which any factor, or
combination of factors, may cause actual results to differ materially from those
contained in any forward-looking statements.

                                       50
<PAGE>
                                   [SST LOGO]
<PAGE>
                                    PART II
                   INFORMATION NOT REQUIRED IN THE PROSPECTUS

ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

    The following table sets forth the costs and expenses, other than
underwriting discounts and commissions, payable by us in connection with the
sale of the convertible subordinated notes and common stock being registered
hereby. All amounts are estimates except the Securities and Exchange Commission
registration fee and the NASD filing fee.

<TABLE>
<S>                                                           <C>
Securities and Exchange Commission registration fee.........  $   45,540
NASD filing fee.............................................      17,750
Nasdaq National Market additional listing fee...............      17,500
Accounting fees and expenses................................     200,000
Legal fees and expenses.....................................     500,000
Printing and engraving......................................     200,000
Blue sky fees and expenses..................................       5,000
Transfer agent fees and expenses............................      15,000
Miscellaneous...............................................       9,210
                                                              ----------
  Total.....................................................  $1,010,000
                                                              ==========
</TABLE>

ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS

    Section 317 of the California Corporations Code allows for the
indemnification of officers, directors, and other corporate agents in terms
sufficiently broad to indemnify such persons under certain circumstances for
liabilities, including reimbursement for expenses incurred, arising under the
Securities Act of 1933, as amended. Article V of our articles of incorporation
and Article X of our bylaws provide for indemnification of our directors,
officers, employees and other agents to the extent and under the circumstances
permitted by the California Corporations Code. Our articles of incorporation
further provides that we must indemnify our directors and executive officers and
may indemnify our other officers and employees and agents to the fullest extent
permitted by California law. We believe that indemnification under our articles
of incorporation covers negligence and gross negligence on the part of
indemnified parties.

    We have entered into indemnification agreements with each of our directors
and officers. These agreements, among other things, require us to indemnify each
director and officer for certain expenses including attorneys' fees, judgments,
fines and settlement amounts incurred by any such person in any action or
proceeding, including any action by or in the right of SST, arising out of
person's services as our director or officer, any subsidiary of ours or any
other company or enterprise to which the person provides services at our
request.

    The Underwriting Agreement (Exhibit 1.1) will provide for indemnification by
the underwriters of SST, our directors, our officers who sign the Registration
Statement, and our controlling persons for some liabilities, including
liabilities arising under the Securities Act.

                                      II-1
<PAGE>
ITEM 16. EXHIBITS


<TABLE>
<CAPTION>
       EXHIBIT
       NUMBER                             DESCRIPTION OF DOCUMENT
---------------------   ------------------------------------------------------------
<C>                     <S>
         1.1*           Form of Underwriting Agreement.

         4.1*           Form of indenture to be entered into between SST and Bank
                        One Trust Company, N.A. as trustee, including the form of
                        note.

         5.1*           Opinion of Cooley Godward LLP.

        12.1+           Computation of Ratio of Earnings to Fixed Charges.

        23.1            Consent of PricewaterhouseCoopers LLP, independent
                        accountants.

        23.2*           Consent of Cooley Godward LLP. See Exhibit 5.1.

        24.1+           Power of Attorney.

        25.1+           Statement of Eligibility and Qualification on Form T-1 of
                        Bank One Trust Company, N.A.
</TABLE>


------------------------


+   Previously filed.


*   To be filed by amendment.

ITEM 17. UNDERTAKINGS

    The undersigned registrant hereby undertakes:

        (1) That for purposes of determining any liability under the Securities
    Act, the information omitted from the form of this prospectus filed as part
    of this Registration Statement in reliance upon Rule 430A and contained in a
    form of prospectus filed by the Registrant pursuant to Rule 424(b)(1) or (4)
    or 497(h) under the Securities Act shall be deemed to be part of this
    Registration Statement as of the time it was declared effective.

        (2) That for purposes of determining any liability under the Securities
    Act, each post-effective amendment that contains a form of prospectus shall
    be deemed to be a new registration statement relating to the securities
    offered therein, and the offering of such securities at that time shall be
    deemed to be the initial bona fide offering thereof.

        (3) Insofar as indemnification for liabilities arising under the
    Securities Act may be permitted to directors, officers and controlling
    persons of the Registrant pursuant to the provisions referenced in Item 15
    of this Registration Statement or otherwise, the Registrant has been advised
    that in the opinion of the Securities and Exchange Commission such
    indemnification is against public policy as expressed in the Securities Act
    and is, therefore, unenforceable. In the event that a claim for
    indemnification against such liabilities (other than the payment by the
    Registrant of expenses incurred or paid by a director, officer, or
    controlling person of the Registrant in the successful defense of any
    action, suit or proceeding) is asserted by such director, officer, or
    controlling person in connection with the securities being registered, the
    Registrant will, unless in the opinion of its counsel the matter has been
    settled by controlling precedent, submit to a court of appropriate
    jurisdiction the question of whether such indemnification by it is against
    public policy as expressed in the Securities Act of 1933, and will be
    governed by the final adjudication of such issue.

                                      II-2
<PAGE>
                                   SIGNATURES


    Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this Amendment No. 1 to
Registration Statement on Form S-3 to be signed on its behalf by the
undersigned, thereunto duly authorized, in the city of Sunnyvale, state of
California, on October 3, 2000.


<TABLE>
<S>                                                    <C>  <C>
                                                       SILICON STORAGE TECHNOLOGY, INC.

                                                       By:  /s/ BING YEH
                                                            -----------------------------------------
                                                            Bing Yeh
                                                            President and Chief Executive Officer
</TABLE>


    In accordance with the requirements of the Securities Act of 1933, this
Amendment No. 1 to Registration Statement has been signed by the following
persons in the capacities and on the dates stated:



<TABLE>
<CAPTION>
                  SIGNATURE                                    TITLE                       DATE
                  ---------                                    -----                       ----
<S>                                            <C>                                    <C>
/s/ BING YEH                                   President, Chief Executive Officer     October 3, 2000
------------------------------------             and Director (PRINCIPAL
Bing Yeh                                         EXECUTIVE OFFICER)

/s/ JEFFREY L. GARON                           Vice President Finance &               October 3, 2000
------------------------------------             Administration, Chief Financial
Jeffrey L. Garon                                 Officer and Secretary (PRINCIPAL
                                                 FINANCIAL AND ACCOUNTING OFFICER)

/s/ YAW WEN HU*                                Senior Vice President, Operations and  October 3, 2000
------------------------------------             Process Development and Director
Yaw Wen Hu

/s/ TSUYOSHI TAIRA*                            Director                               October 3, 2000
------------------------------------
Tsuyoshi Taira

/s/ RONALD CHWANG*                             Director                               October 3, 2000
------------------------------------
Ronald Chwang

                                               Director
------------------------------------
Yasushi Chikagami
</TABLE>



<TABLE>
<S>   <C>                                            <C>                                    <C>
*By:  /s/ BING YEH                                                                          October 3, 2000
      -------------------------------
      Bing Yeh
      ATTORNEY-IN-FACT
</TABLE>


                                      II-3
<PAGE>
                                    EXHIBITS


<TABLE>
<CAPTION>
       EXHIBIT
       NUMBER                             DESCRIPTION OF DOCUMENT
---------------------   ------------------------------------------------------------
<C>                     <S>
         1.1*           Form of Underwriting Agreement.

         4.1*           Form of indenture to be entered into between SST and Bank
                        One Trust Company, N.A. as trustee, including the form of
                        note.

         5.1*           Opinion of Cooley Godward LLP.

        12.1+           Computation of Ratio of Earnings to Fixed Charges.

        23.1            Consent of PricewaterhouseCoopers LLP, independent
                        accountants.

        23.2*           Consent of Cooley Godward LLP. See Exhibit 5.1.

        24.1+           Power of Attorney.

        25.1+           Statement of Eligibility and Qualification on Form T-1 of
                        Bank One Trust Company, N.A.
</TABLE>


------------------------


+   Previously filed.


*   To be filed by amendment.


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