<PAGE>

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                                   FORM 10-Q/A
                               AMMENDMENT NO. 2 TO

(Mark One)

[ X ] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934

For the quarterly period ended September 27, 1998

                                       OR

[   ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934

For the transition period from                       to
                               ---------------------    ---------------------

Commission file number 0-21970

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

                            MATTSON TECHNOLOGY, INC.
             (Exact name of registrant as specified in its charter)

DELAWARE                                            77-0208119
(State or other jurisdiction of             (I.R.S. Employer Identification No.)
 incorporation or organization)

3550 WEST WARREN AVENUE
FREMONT, CALIFORNIA                                    94538
(Address of principal executive offices)             (Zip Code)

                                 (510) 657-5900
              (Registrant's telephone number, including area code)

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

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days.
                              Yes   X    No
                                  -----     -----

Number of shares of common stock outstanding as of November 6, 1998: 15,001,191


                                       1
<PAGE>

The undersigned registrant hereby amends the following items, financial 
statements and exhibits or other portions of its Quarterly Report on Form 10-Q
filed November 12, 1998 as amended November 24, 1998 as set forth in the 
pages attached hereto.

                         PART I -- FINANCIAL INFORMATION


1.    FINANCIAL STATEMENTS

                            MATTSON TECHNOLOGY, INC.
                      CONDENSED CONSOLIDATED BALANCE SHEET
                                 (in thousands)
                                   (unaudited)

                                     ASSETS

<TABLE>
<CAPTION>
                                                               SEPT. 27,         DEC. 31,
                                                                 1998              1997
                                                                 ----              ----

<S>                                                          <C>               <C>
Current assets:
  Cash and cash equivalents                                  $    21,716       $    25,583
  Short-term investments                                           7,170             8,598
  Accounts receivable, net                                         9,246            14,784
  Inventories                                                     11,738            19,068
  Income tax receivable                                            3,300                 -
  Notes receivable from stockholder                                3,129                 -
  Deferred taxes                                                       -             4,222
  Prepaid expenses and other current assets                        1,510             1,000
                                                             -----------       -----------
    Total current assets                                          57,809            73,255
Property and equipment, net                                       12,950            11,188
Other assets                                                       7,098                 -
                                                             -----------       -----------
                                                             $    77,857       $    84,443
                                                             -----------       -----------
                                                             -----------       -----------


                      LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
  Accounts payable                                           $     4,637       $     3,349
  Accrued liabilities                                             19,044            12,910
                                                             -----------       -----------
    Total current liabilities                                     23,681            16,259
                                                             -----------       -----------

Stockholders' equity:
  Common stock                                                        15                14
  Additional paid in capital                                      62,521            57,418
  Retained earnings                                               (5,147)           12,117
  Treasury stock                                                  (2,987)           (1,075)
  Other                                                             (226)             (290)
                                                             -----------       -----------
    Total stockholders' equity                                    54,176            68,184
                                                             -----------       -----------
                                                             $    77,857       $    84,443
                                                             -----------       -----------
                                                             -----------       -----------
</TABLE>





     See accompanying notes to condensed consolidated financial statements.

                                       2
<PAGE>

                            MATTSON TECHNOLOGY, INC.
                 CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS
                    (in thousands, except per share amounts)
                                   (unaudited)

<TABLE>
<CAPTION>
                                                            THREE MONTHS ENDED                NINE MONTHS ENDED
                                                            ------------------                -----------------
                                                         SEPT. 27,       SEPT. 28,        SEPT. 27,        SEPT. 28,
                                                           1998            1997             1998             1997
                                                           ----            ----             ----             ----

<S>                                                    <C>             <C>             <C>              <C>
Net sales                                              $       9,420   $      22,633   $      45,317    $      52,227
Cost of sales                                                  8,920          10,784          28,541           25,507
                                                       -------------   -------------   -------------    -------------
  Gross profit                                                   500          11,849          16,776           26,720
                                                       -------------   -------------   -------------    -------------
Operating expenses:
  Research, development and engineering                        4,107           3,899          12,378           10,076
  Selling, general and administrative                          6,294           6,884          18,662           17,193
  Acquired in-process research and development                 4,220              -            4,220               -
                                                       -------------   -------------   -------------    -------------
    Total operating expenses                                  14,621          10,783          35,260           27,269
                                                       -------------   -------------   -------------    -------------
Income (loss) from operations                                (14,121)          1,066         (18,484)            (549)
Interest and other income (expense), net                         431             351           1,420            1,198
                                                       -------------   -------------   -------------    -------------
Income (loss) before income taxes                            (13,690)          1,417         (17,064)             649
Provision for (benefit from) income taxes                      1,109             468             200              213
                                                       -------------   -------------   -------------    -------------
Net income (loss)                                      $     (14,799)  $         949   $     (17,264)   $         436
                                                       -------------   -------------   -------------    -------------
                                                       -------------   -------------   -------------    -------------

Net income (loss) per share:
  Basic                                                $      (1.00)   $        0.07   $       (1.19)   $        0.03
                                                       -------------   -------------   -------------    -------------
                                                       -------------   -------------   -------------    -------------
  Diluted                                              $      (1.00)   $        0.06   $       (1.19)   $        0.03
                                                       -------------   -------------   -------------    -------------
                                                       -------------   -------------   -------------    -------------



Weighted average shares outstanding:
  Basic                                                       14,839          14,109          14,522           14,103
                                                       -------------   -------------   -------------    -------------
                                                       -------------   -------------   -------------    -------------
  Diluted                                                     14,839          15,629          14,522           15,286
                                                       -------------   -------------   -------------    -------------
                                                       -------------   -------------   -------------    -------------
</TABLE>










     See accompanying notes to condensed consolidated financial statements.

                                       3
<PAGE>

                            MATTSON TECHNOLOGY, INC.
                 CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS
                                 (in thousands)
                                   (unaudited)

<TABLE>
<CAPTION>
                                                                             NINE MONTHS ENDED
                                                                             -----------------
                                                                         SEPT. 27,         SEPT. 28,
                                                                           1998              1997
                                                                           ----              ----
<S>                                                                    <C>               <C>
Cash flows from operating activities:
  Net income (loss)                                                    $   (17,264)      $       436
  Adjustments to reconcile net income (loss) to net cash 
   provided by (used in) operating activities:
   Depreciation                                                              2,517             2,104
   In-process research and development                                       4,220              -
   Amortization of intangibles                                                 241              -
   Deferred taxes                                                            4,222              -
   Changes in assets and liabilities:
      Accounts receivable                                                    5,877              (452)
      Inventories                                                            9,900            (5,215)
      Income tax receivable                                                 (2,778)             -
      Prepaid expenses and other assets                                       (296)             (540)
      Accounts payable                                                      (3,230)            1,939
      Accrued liabilities                                                      431             1,167
                                                                       -----------       -----------
   Net cash provided by (used in) operating activities                       3,840              (561)
                                                                       -----------       -----------
Cash flows from investing activities:
   Acquisition of property and equipment                                    (1,224)           (2,070)
   Notes receivable stockholder                                             (3,129)
   Purchases of short-term investments                                     (40,676)          (14,036)
   Sales and maturities of short-term investments                           42,126            22,024
                                                                       -----------       -----------
   Net cash provided by (used in) investing activities                      (2,903)            5,918
                                                                       -----------       -----------
Cash flows from financing activities:
   Retirement of debt acquired in Concept acquisition                       (4,000)             -
   Proceeds from the issuance of Common Stock, net                           1,065               978
   Purchase of Common Stock                                                 (1,912)           (3,131)
                                                                       -----------       -----------
   Net cash used in financing activities                                    (4,847)           (2,153)
                                                                       -----------       -----------
Effect of exchange rate changes on cash and cash equivalents                    43               (59)
                                                                       -----------       -----------
Net increase (decrease) in cash and cash equivalents                        (3,867)            3,145
Cash and cash equivalents, beginning of period                              25,583            21,547
                                                                       -----------       -----------
Cash and cash equivalents, end of period                               $    21,716       $    24,692
                                                                       -----------       -----------
                                                                       -----------       -----------
</TABLE>










     See accompanying notes to condensed consolidated financial statements.

                                       4
<PAGE>

                            MATTSON TECHNOLOGY, INC.
              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
                                   (UNAUDITED)

NOTE 1 BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

BASIS OF PRESENTATION

The accompanying unaudited condensed consolidated financial statements have been
prepared in accordance with generally accepted accounting principles for interim
financial information and with the instructions to Form 10-Q and Regulation S-X.
Accordingly, they do not include all of the information and footnotes required
by generally accepted accounting principles for complete financial statements.
In the opinion of management, all adjustments (consisting of normal recurring
adjustments) considered necessary for a fair presentation have been included.

The financial statements should be read in conjunction with the audited
financial statements included in the Company's Annual Report for the year ended
December 31, 1997.

The Company has amended the third quarter condensed consolidated financial 
statements as a result of recent SEC comments regarding accounting for 
acquisition-related in-process research and development. In connection with 
the Company's acquisition of Concept Systems Design in July 1998, the Company 
wrote off in-process research and development of approximately $5.8 million 
in the third quarter ended September 27, 1998. The Company has not received 
any inquiry from the SEC regarding this matter, but has decided to 
proactively address the SEC concerns. The Company believes that the write off 
of in-process research and development which it had taken was made in 
accordance with established industry practice at the time. In addition, this 
write-off was based upon a valuation provided by an independent appraiser. As 
a result of the recent SEC comments the in-process charge resulting from the 
acquisition of Concept was reduced from $5.8 million to $4.2 million. The 
resulting net change of approximately $1.6 million increases goodwill, which 
will be amortized over a five-year period. The increased amortization for the 
third quarter was approximately $53,000.

The results of operations for the three month and nine month periods ended
September 27, 1998 are not necessarily indicative of results that may be
expected for the entire year ending December 31, 1998.

NOTE 2 ACQUISITION OF CONCEPT SYSTEMS DESIGN

On July 24, 1998, the Company completed its acquisition of Concept Systems
Design, Inc. (Concept), a company involved in developing, manufacturing and
selling semiconductor capital equipment. The transaction was achieved through
the merger of a wholly-owned subsidiary of the Company with and into Concept. In
connection with the merger, the Company issued 795,138 shares of Common Stock to
the former shareholders of Concept. The former shareholders of Concept also may
acquire up to 547,569 additional shares of the Company's Common Stock in
connection with the merger if certain conditions are met prior to the end of the
first twenty-four full calendar months following the closing of the transaction.
The merger has been accounted for as a purchase and the results of operations of
Concept have been included in the statements of operations of the Company from
the date of acquisition. The purchase price of the acquisition of $4,689,000,
which includes $650,000 of estimated acquisition related costs, was used to
acquire the net assets of Concept. The purchase price was allocated to assets
acquired and liabilities assumed based on the book value of Concept's current
assets and liabilities, which management believes approximates their fair value,
the estimated fair value of property and equipment, based on management's
estimates of fair value, and an independent appraisal for all other identifiable
assets. The excess of the purchase price over the net tangible and intangible
assets acquired and liabilities assumed has been allocated to goodwill. The
allocation of the purchase price was as follows (in thousands):

<TABLE>
        <S>                                                        <C>
        Property and equipment                                     $  3,055
        Current and other assets                                      4,041
        Liabilities assumed                                         (13,570)
        Goodwill                                                      1,643
        Acquired in-process research and development                  4,220
        Acquired developed technology and workforce                   5,300
                                                                   --------
                                                                   $  4,689
                                                                   --------
                                                                   --------
</TABLE>


                                       5
<PAGE>

The acquired in-process research and development was expensed in the quarter 
ended September 27, 1998. The acquired developed technology, workforce and 
goodwill will be amortized to income over periods ranging from 3 to 7 years.

In addition to the purchase price shown above, the agreement for the acquisition
of Concept also includes the contingent distribution of shares of Common Stock
of Mattson of 100,000 shares that will be issued to the Concept shareholders if
Concept achieves net revenues of at least $16,667,000 during the first
twenty-four full calendar months following the acquisition date. Up to an
additional 447,569 shares of Mattson Common Stock will be issued to the Concept
shareholders if the net revenue milestone is achieved and the stock price of
Mattson Common Stock does not reach at least $12 per share for any consecutive
ten day trading period during the twenty-four full calendar months following the
acquisition. Additional shares issued, if any, will be valued at the fair value
of the shares at the date of issue and will result in additional goodwill.



The following table represents pro forma information assuming that the
acquisition took place at the beginning of the periods presented.

<TABLE>
<CAPTION>
            (IN THOUSANDS)                          Unaudited             Unaudited
                                                 9 Months ended        12 Months ended
                                               September 27, 1998     December 31, 1997
                                               ------------------     -----------------
            <S>                                <C>                    <C>
            Net sales                              $    48,634           $    83,040
            Net loss                                   (27,167)               (8,694)
            Basic and diluted loss per share       $     (1.87)          $     (0.58)
</TABLE>

NOTE 3 NOTES RECEIVABLE FROM STOCKHOLDER

During the third quarter of 1998 the Company extended a one year loan to Brad
Mattson, The Chief Executive Officer of the Company, in the amount of $3.1
million. The loan is collateralized by 2.2 million shares of the Company's
Common Stock and is a full recourse note bearing interest at 10%. Interest is
payable at the end of the one year loan.

NOTE 4 BALANCE SHEET DETAIL (IN THOUSANDS):

<TABLE>
<CAPTION>
                                                              SEPT. 27,         DEC. 31,
                                                                1998              1997
                                                                ----              ----
<S>                                                        <C>               <C>
Inventories:
    Purchased parts and raw materials                      $       7,532     $      7,648
    Work-in-process                                                3,465            7,606
    Finished goods                                                   376            2,266
    Evaluation systems                                               365            1,548
                                                           -------------     ------------
                                                           $      11,738     $     19,068
                                                           -------------     ------------
                                                           -------------     ------------

Accrued liabilities:
    Warranty, installation and retrofit reserve            $       5,426     $      4,756
    Accrued compensation and benefits                              1,574            2,199
    Income taxes                                                   1,263            1,971
    Commissions                                                      553            1,277
    Deferred income                                                4,353            1,598
    Customer deposits                                              2,801                -
    Facilities consolidation accrual                               3,074                -
    Other                                                              -            1,109
                                                           -------------     ------------
                                                           $      19,044     $     12,910
                                                           -------------     ------------
                                                           -------------     ------------
</TABLE>


                                       6
<PAGE>

NOTE 5 CERTAIN STOCK TRANSACTIONS

In March 1998, the Company announced that its Board of Directors had authorized
the Company to repurchase during the next three years up to 1,000,000 shares of
the Company's Common Stock in the open market from time to time. As of November
3, 1998, the Company had repurchased 274,800 shares for approximately $1.9
million.


NOTE 6 NEW ACCOUNTING PRONOUNCEMENT

As of January 1, 1998, the Company adopted Statement of Financial Accounting
Standards No. 130 (SFAS 130), "Reporting Comprehensive Income". SFAS 130
establishes new rules for the reporting and display of comprehensive income and
its components; however, the adoption of this Statement had no impact on the
Company's net income or stockholders' equity. SFAS 130 requires unrealized gains
or losses on the Company's available for sale securities and foreign currency
translation adjustments, which prior to adoption were reported separately in
stockholders' equity, to be included in other comprehensive income. Prior year
financial statements have been reclassified to conform to the requirements of
SFAS 130.



The following are the components of comprehensive income (loss):

<TABLE>
<CAPTION>
                                                             THREE MONTHS ENDED                 NINE MONTHS ENDED
     (in thousands)                                       SEPT. 27,       SEPT. 28,         SEPT. 27,       SEPT. 28,
                                                            1998             1997             1998             1997
                                                            ----             ----             ----             ----
     <S>                                               <C>              <C>              <C>              <C>
     Net income (loss)                                 $      (14,799)  $          949   $      (17,264)  $          436
     Foreign currency translation adjustments                      36              (12)              64              (69)
                                                       ---------------  ---------------  ---------------  ---------------
     Comprehensive income (loss)                       $      (14,763)  $          937   $      (17,200)  $          367
                                                       ---------------  ---------------  ---------------  ---------------
                                                       ---------------  ---------------  ---------------  ---------------
</TABLE>


NOTE 7 NET INCOME (LOSS) PER SHARE

The Company adopted Financial Accounting Standards Board (FASB) Statement 128
effective with the quarter and year ended December 31, 1997. All earnings per
share data has been restated to reflect the FASB 128 method of computation. FASB
128 requires dual presentation of basic and diluted earnings per share (EPS) on
the face of the income statement. Basic EPS is computed by dividing income
available to common stockholders (numerator) by the weighted average number of
common shares outstanding (denominator) for the period. Diluted EPS gives effect
to all dilutive potential common shares outstanding during the period. The
computation of diluted EPS uses the average market prices during the period.

For the quarter and nine months ended September 27, 1998, there were no
differences between the numerators and denominators used for the basic and
diluted EPS calculations. For the quarter and nine months ended September 28,
1997, there were no differences in the numerators used for the basic and diluted
EPS calculations; however, there were differences in the denominators because of
the effect of including dilutive stock options. Total stock options outstanding
at September 27, 1998 were 2,696,461.


                                       7
<PAGE>

ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS.

OVERVIEW

Mattson Technology, Inc. ("Mattson" or the "Company") designs, manufactures and
markets advanced fabrication equipment to semiconductor manufacturers worldwide.
The Company's product line is based on the Company's modular "Aspen" platform,
which accommodates two process chambers supporting increased throughput. The
Company currently offers Aspen Strip, CVD, RTP, LiteEtch based upon the Aspen
platform and now with the acquisition of Concept Systems Design ("Concept"), the
Company also now offers Epi products. To date, the Company has derived a
substantial majority of its sales from Aspen Strip systems. In addition, the
Company derives sales from spare parts and maintenance services.

The cyclicality and uncertainties regarding overall market conditions continue
to present significant challenges to the Company and may continue to have a
significant adverse impact on the Company's ability to forecast near term
revenue expectations. The ability of the Company to modify its operations in
response to short term changes in market conditions is limited. The extent and
duration of the continued reduction in capital spending in the semiconductor
industry and the ultimate impact on the Company and its results of operations
and financial condition cannot be precisely predicted.

The Company continues to be affected by the continuing industry slowdown. In
response to continued lower revenues, the Company has implemented and adhered to
its cost control measures, including a 15 percent reduction in its workforce and
a reduction in executive salaries. Future results will depend on a variety of
factors, particularly overall market conditions and also timing of significant
orders; the ability of the Company to bring new systems to market; the timing of
new product releases by the Company's competitors; patterns of capital spending
by the Company's customers; market acceptance of new and/or enhanced versions of
Company systems; changes in pricing by the Company, its competitors, customers,
or suppliers and the mix of products sold.

The Company generally recognizes a sale upon shipment of a system. However, from
time to time, the Company allows customers to evaluate systems. The Company does
not recognize the associated sale until and unless an evaluation system is
accepted by the customer.

On July 24, 1998 the Company completed its acquisition of Concept Systems
Design, Inc. ("Concept"), a supplier of epitaxial (EPI) systems. The transaction
was achieved through the merger of a wholly owned subsidiary of Mattson with and
into Concept. In connection with the merger, Mattson issued 795,138 shares of
Mattson Common Stock to the former shareholders of Concept. The former
shareholders of Concept also may acquire up to 547,569 additional shares of
Mattson Common Stock in connection with the merger if certain conditions are met
prior to the end of the first twenty-four full calendar months following the
closing of the transaction. The transaction has been accounted for as a
purchase. The acquisition resulted in a $4.2 million write-off of in-process
research and development in the third quarter of 1998.

The Company has amended the third quarter condensed consolidated financial 
statements as a result of recent SEC comments regarding accounting for 
acquisition-related in-process research and development. In connection with 
the Company's acquisition of Concept Systems Design in July 1998, the Company 
wrote off in-process research and development of approximately $5.8 million 
in the third quarter ended September 27, 1998. The Company has not received 
any inquiry from the SEC regarding this matter, but has decided to 
proactively address the SEC concerns. The Company believes that the write off 
of in-process research and development which it had taken was made in 
accordance with established industry practice at the time. In addition, this 
write-off was based upon a valuation provided by an independent appraiser. As 
a result of the recent SEC comments the in-process charge resulting from the 
acquisition of Concept was reduced from $5.8 million to $4.2 million. The 
resulting net change of approximately $1.6 million increases goodwill, which 
will be amortized over a five-year period. The increased amortization for the 
third quarter was approximately $53,000.

IMPACT OF YEAR 2000
Some of the Company's older computer programs were written using two digits
rather than four to define the applicable year. As a result, those computer
programs have time-sensitive software that may recognize a date using "00" as
the year 1900 rather than the year 2000. This could cause a system failure or
miscalculations causing disruptions of operations, including, among other
things, a temporary inability to process transactions, send invoices, or engage
in similar normal business activities.


                                       8
<PAGE>

The Company has commenced a Year 2000 date conversion project to address
necessary changes and an implementation strategy. The "Year 2000 Computer
Problem" creates risks for the Company from unforeseen problems in its own
computer systems and from third parties with whom the Company deals on financial
transactions. The Company does not anticipate that it will incur material
expenditures for the resolution of any Year 2000 issues related either to its
own information systems, databases and programs, or its products. However, there
can be no assurance that the Company will not experience serious unanticipated
negative consequences or material costs caused by undetected errors. In
addition, the Company could be adversely impacted by Year 2000 issues faced by
major distributors, suppliers, customers, vendors and financial service
organizations with which the Company interacts. Management is in the process of
determining the impact, if any, that third parties who are not Year 2000
compliant may have on the operations of the Company.

FORWARD LOOKING STATEMENTS

This report on Form 10-Q contains forward looking statements regarding, among
other matters, the Company's future strategy, product development plans, and
productivity gains and growth. The forward looking statements are made pursuant
to the safe harbor provisions of the Private Securities Litigation Reform Act of
1995. Forward looking statements address matters that are subject to a number of
risks and uncertainties. In addition to the general risks associated with the
development of complex technology, future results of the Company will depend on
a variety of factors as described herein and in other filings made by the
Company with the Securities and Exchange Commission.

RESULTS OF OPERATIONS


The following table sets forth the statement of operations data of the Company
expressed as a percentage of net sales for the period indicated:

<TABLE>
<CAPTION>
                                                             THREE MONTHS ENDED                  NINE MONTHS ENDED
                                                             ------------------                  -----------------
                                                         SEPT. 27,        SEPT. 28,         SEPT. 27,         SEPT. 28,
                                                           1998              1997              1998             1997
                                                           ----              ----              ----             ----

<S>                                                      <C>              <C>               <C>               <C>
Net sales                                                  100%             100%              100%              100%
Cost of sales                                               95%              48%               63%               49%
                                                            ---              ---               ---               ---
    Gross margin                                             5%              52%               37%               51%
                                                             --              ---               ---               ---
Operating expenses:
    Research, development and engineering                   44%              17%               27%               19%
    Selling, general and administrative                     67%              30%               41%               33%
    Acquired in process research and development            45%               -                 9%                -
      Total operating expenses                             155%              48%               78%               52%
Income (loss) from operations                             (150)%              5%              (41%)              (1%)
Income (loss) before income taxes                         (145)%              6%              (38)%               1%
Net income (loss)                                         (157)%              4%              (38)%               1%
</TABLE>





                                       9
<PAGE>

NET SALES

Net sales for the third quarter of 1998 decreased 58% to $9.4 million from $22.6
million for the third quarter of 1997. The quarterly decrease in sales reflected
a 67% decrease in unit sales for the third quarter of 1998 compared to the third
quarter of 1997. There were no system revenues from the newly acquired Concept
Epi product line. Net sales for the first nine months of 1998 decreased 13% to
$45.3 million from $52.2 million for the first nine months of 1997. Net sales
for the first nine months of 1998 compared to first nine months of 1997
reflected a 20% decrease in unit sales. This decrease was due to the Company's
lower sales of its Aspen Strip products which was principally a result of the
general industry slowdown.

Third quarter bookings were $11.0 million, down from $25.2 million for the third
quarter of 1997, a decrease of 57 percent. Backlog decreased 46% to $21.9
million, compared to $40.2 million at the end of the third quarter of 1997.
There were no system bookings from the newly acquired Concept Epi product line
and there is no current backlog.

Average selling prices (ASP's) increased 6% for the third quarter of 1998
compared to the third quarter of 1997. The increases were primarily as result of
a sale of a dual chamber CVD partially offset by lower ASP's on the Aspen Strip
single chamber. ASP's increased 4% for the first nine months of 1998 compared to
the first nine months of 1997. The increases were primarily a result of the
proportionate decrease in sales of the Aspen Strip single chamber systems.

International sales to customers based in Europe, Japan and the Pacific Rim
(which includes Taiwan, Singapore and Korea), accounted for 62% and 78% of net
sales for the third quarter of 1998 and 1997, respectively. International sales
for the first nine months of 1998 and 1997 were 72% and 56% of net sales,
respectively. All sales are denominated in U.S. dollars. The Company's operating
results could be materially and adversely affected by any loss of business from,
the cancellation of orders by, or decreases in prices of systems sold through
Marubeni, the Company's distributor in Japan. The Company anticipates that
international sales will continue to account for a significant portion of 1998
total net sales.

GROSS MARGIN

The Company's gross margin for the third quarter of 1998 decreased to 5% from
52% for the third quarter of 1997, and for the first nine months of 1998
decreased to 37% from 51% for the first nine months of 1997. The decrease in
margins was significantly affected by a $2.6 million write down of inventory
related to the Company's 300mm program. Due to the continued push-out of the
industry 300mm requirements, previously inventoried 300mm program materials have
been expensed in the third quarter. Also, the addition of Concept manufacturing
overhead, the lower production volumes and pricing pressure in Taiwan and Japan
continue to result in lower margins.

The Company's gross margin may continue to be affected by a variety of factors.
Although the Company has not offered substantial discounts on its systems to
date, there can be no assurance that the Company will not continue to experience
pricing pressures in the future. The Company's gross margin on international
sales, other than sales through Marubeni, is substantially the same as domestic
sales. Sales to Marubeni typically carry a lower gross margin, as Marubeni is
primarily responsible for sales and support costs in Japan.

The Company's reliance on outside vendors generally, and a sole or a limited
group of suppliers in particular, involves several risks, including a potential
inability to obtain an adequate supply of required components and reduced
control over pricing and timely delivery of components. Any inability to obtain
adequate deliveries or any other circumstance that would require the Company to
seek alternative sources of supply or to manufacture such components internally
could delay the Company's ability to ship its systems and could have a material
adverse effect on the Company, including an increase in the Company's cost of
sales and therefore an adverse impact on gross margin. In addition, new system
introductions and enhancements and rapid growth may also have an adverse effect
on gross margin due to the inefficiencies associated with manufacturing of new
product lines and rapid expansion, respectively.



                                       10
<PAGE>

RESEARCH, DEVELOPMENT AND ENGINEERING

Research, development and engineering expenses for the third quarter of 1998
were $4.1 million, or 44% of net sales, as compared to $3.9 million, or 17%, for
the third quarter of 1997. The increase in expense as a percentage of net sales
for the third quarter of 1998 was due primarily to lower sales volume. The
addition of Concept increased research and development charges by approximately
$0.3 million for the third quarter of 1998. Research, development and
engineering expenses for the first nine months of 1998 were $12.4 million, or
27% of net sales, as compared to $10.1 million, or 19%, for the first nine
months of 1997. The increase in expenses for the first nine months of 1998 as
compared to the first nine months of 1997 was primarily due to compensation
expense which increased to $6.4 million for the first nine months of 1998 from
$5.6 million for the first nine months of 1997 and engineering materials which
increased to $2.6 million for the first nine months of 1998 from $1.9 million
for the first nine months of 1997. The Company believes that continued
investment in research and development, including its multi-product strategy is
critical to maintaining a strong technological position in the industry.

The loss in the third quarter of 1998 includes one-time charges of $4.2 million
for the write-down of certain in-process technology which were incurred as part
of the Company's acquisition of Concept Systems Design.

SELLING, GENERAL AND ADMINISTRATIVE

Selling, general and administrative expenses for the third quarter of 1998 were
$6.3 million, or 67% of net sales, as compared to $6.9 million, or 30%, for the
third quarter of 1997. The addition of Concept increased selling, general and
administrative charges by approximately $0.5 million for the third quarter of
1998. The decrease in expenses for the third quarter of 1998 was due to
decreases in commission expense of $1.1 million partially offset by increases in
building and utilities of $0.4 million and a $0.6 million non recurring
facilities charge. The facilities charge relates to the remaining lease cost on
the Company's former corporate offices which were vacated by a move of the
corporate offices to the acquired Concept facilities. The expenses for the nine
months of 1998 were $18.7 million, or 41% of net sales, as compared to $17.2
million, or 32.9%, for nine months of 1997. The increase of $1.5 million in
expenses for the nine months of 1998 was due to an increase in building and
utilities of $0.9 million and the excess facilities charge of $0.6 million.

PROVISION FOR INCOME TAXES

The Company recorded an income tax expense of $1.1 million in the third quarter.
This expense leaves the cumulative tax provision for the year at $0.2 million
which relates to estimated foreign taxes. The Company has recorded approximately
$3.3 million in refundable taxes as a result of the current year losses which
can be carried back to previous years taxes paid. In addition the Company has
assessed the realizability of the remaining deferred tax assets and determined
that a full valuation allowance is necessary for the deferred tax assets.

LIQUIDITY AND CAPITAL RESOURCES

Net cash provided by operations during the first nine months of 1998 was $3.8 
million, compared to $0.6 million of net cash used in operations during the 
first nine months of 1997. Net cash provided by operations during the first 
nine months of 1998 was primarily attributable to the net loss of $17.3 
million offset by non cash depreciation, in-process research and development 
and deferred taxes and a decrease in accounts receivable of $5.9 million, a 
decrease in inventories of $9.9 million and offset by a decrease in 
liabilities of $3.2 million.

The Board of Directors has authorized the Company to repurchase up to 
1,000,000 shares of the Company's Common Stock, of which 274,800 shares have 
been repurchased by the Company as of November 3, 1998 for approximately $1.9 
million.

During the third quarter of 1998 the Company extended a one year loan to Brad
Mattson, the Chief Executive Officer of the Company, in the amount of $3.1
million. The loan is fully collateralized. The interest rate established on the
loan is set at 10 %. The note is a full recourse note.


                                       11
<PAGE>

While the Company believes that it currently has sufficient cash and short-term
investment balances to meet the Company's cash requirements during at least the
next twelve months, to the extent that such funds are insufficient to fund the
Company's activities the Company may need to raise additional funds through
public or private equity or debt financing from other sources. The sale of
additional equity or additional convertible debt may result in additional
dilution to the Company's stockholders and such securities may have rights,
preferences or privileges senior to those of the Common Stock. There can be no
assurance that additional equity or debt financing will be available when
required or, if available, will be on terms satisfactory to the Company.

MERGER WITH CONCEPT SYSTEMS DESIGN, INC.

On July 24, 1998, the Company completed its acquisition of Concept. The
transaction was achieved through the merger of a wholly-owned subsidiary of the
Company with and into Concept. In connection with the merger, the Company issued
795,138 shares of Common Stock to the former shareholders of Concept. The former
shareholders of Concept also may acquire up to 547,569 additional shares of the
Company's Common Stock in connection with the merger if certain conditions are
met prior to the end of the first twenty-four full calendar months following the
closing of the transaction. The merger has been accounted for as a purchase.



The purchase price of the acquisition was $4,689,000 which included $650,000 in
estimated acquisition related costs. The purchase price was allocated as
follows:

<TABLE>
<S>                                                           <C>
Property and equipment                                         $    3,055,000
Current and other assets                                            4,041,000
Liabilities assumed                                               (13,570,000)
Goodwill                                                            1,643,000
Acquired in process research and development                        4,220,000
Acquired developed technology and workforce                         5,300,000
                                                              ----------------

    Total                                                      $    4,689,000
                                                              ----------------
                                                              ----------------
</TABLE>

The goodwill, acquired developed technology and workforce are recorded on the
balance sheet as other assets and will be amortized on a straight-line basis
over periods ranging from 3 to 7 years.

The acquired in process research and development was expensed at the time of the
acquisition as a one-time charge.





                                       12
<PAGE>

                          PART II -- OTHER INFORMATION


Item 3.    Quantitative and Qualitative disclosures About Market Risk

           Not Applicable

ITEM 5.    OTHER INFORMATION.

           Not Applicable

ITEM 6.    EXHIBITS AND REPORTS ON FORM 8-K.

       (a)    Exhibits

              Exhibit 27 (Electronic filing only)

       (b)    Reports on Form 8-K(a)

              Form 8-K filed August 6, 1998 reporting the acquisition of Concept
              Systems Design, Inc. by the Company

              Form 8-K/A filed September 28, 1998 amending the Company's Form
              8-K filed August 6, 1998 to include the financial statements of
              Concept Systems Design, Inc. and pro forma financial information.



                                       13
<PAGE>

                                   SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.



                                             MATTSON TECHNOLOGY, INC.




Date: February 16, 1999                         /s/ Richard S. Mora
                                   ---------------------------------------------
                                                  Richard S. Mora
                                             Vice President of Finance
                                            and Chief Financial Officer
                                          (as principal financial officer
                                           and on behalf of Registrant)












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