MATTSON TECHNOLOGY INC
SC 13G/A, 2000-02-14
SPECIAL INDUSTRY MACHINERY, NEC
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13G


                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                                (AMENDMENT NO. 3)


                            Mattson Technology, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    57723100
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

Check the following box to designate the rule pursuant to which this Schedule is
filed:

    [ ]    Rule 13d - 1(b)

    [ ]    Rule 13d - 1(c)

    [ ]    Rule 13d - 1(d)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter disclosure
provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

                               Page 1 of 5 pages
<PAGE>   2

- -------------------------------                 -------------------------------
      CUSIP NO. 57723100             13G               Page 2 of 5 Pages
- -------------------------------                 -------------------------------

- --------------------------------------------------------------------------------
1           NAME OF REPORTING PERSON S. S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
            PERSON

            Brad Mattson
- --------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                      (a)  [ ]
            N/A                                                       (b)  [ ]
- --------------------------------------------------------------------------------
3           SEC USE ONLY

- --------------------------------------------------------------------------------
4           CITIZENSHIP OR PLACE OF ORGANIZATION

            U.S.A.
- --------------------------------------------------------------------------------
                        5           SOLE VOTING POWER

    NUMBER OF                       3,691,265
     SHARES             --------------------------------------------------------
  BENEFICIALLY          6           SHARED VOTING POWER
    OWNED BY
     BY EACH                        0
    REPORTING           --------------------------------------------------------
     PERSON             7           SOLE DISPOSITIVE POWER
      WITH
                                    3,691,265
                        --------------------------------------------------------
                        8           SHARED DISPOSITIVE POWER

                                    0
- --------------------------------------------------------------------------------
9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            3,691,265
- --------------------------------------------------------------------------------
10          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
            SHARES*

            [ ] N/A
- --------------------------------------------------------------------------------
11          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
            22.5%
- --------------------------------------------------------------------------------
12          TYPE OF REPORTING PERSON *
            IN
- --------------------------------------------------------------------------------



                      *SEE INSTRUCTION BEFORE FILLING OUT!



                               Page 2 of 5 pages
<PAGE>   3

- -------------------------------                 -------------------------------
      CUSIP NO. 57723100             13G               Page 3 of 5 Pages
- -------------------------------                 -------------------------------

ITEM 1.

        (a)    Name of Issuer:  Mattson Technology, Inc.

        (b)    Address of Issuer's Principal Executive Offices:
               2800 Bayview Drive
               Fremont, CA  94538
ITEM 2.

        (a)    Name of Person Filing:  Brad Mattson

        (b)    Address of Principal Business Office or, if none, Residence:
               Mattson Technology, Inc.
               2800 Bayview Drive
               Fremont, CA  94538

        (c)    Citizenship: The filing person is a citizen of the United States
               of America.

        (d)    Title of Class of Securities:  Common Stock

        (e)    CUSIP Number:  57723100

ITEM 3.        STATUS OF PERSON FILING:
               Not Applicable

ITEM 4.        OWNERSHIP

        (a)    Amount Beneficially Owned:
               Amount owned "beneficially" within the meaning of rule 13d-3:
               3,691,265 shares; includes 155,749 shares subject to options
               exercisable within 60 days of December 31, 1999.

        (b)    Percent of Class: 22.5%, based on 16,216,144 shares outstanding
               as of December 31, 1999.

        (c)    Number of shares as to which such person has:

               (i)    sole power to vote or to direct the vote:  3,691,265

               (ii)   shared power to vote or to direct the vote:  0

               (iii)  sole power to dispose or to direct the disposition of:
                      3,691,265

               (iv)   shared power to dispose or to direct the disposition of: 0



                               Page 3 of 5 pages
<PAGE>   4

- -------------------------------                 -------------------------------
      CUSIP NO. 57723100             13G               Page 4 of 5 Pages
- -------------------------------                 -------------------------------

ITEM 5.        OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS
               Not Applicable.

ITEM 6.        OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON
               Pursuant to a November 17, 1999 Pledge Agreement between
               Prudential Securities Incorporated and Brad Mattson, 1,600,000 of
               Mr. Mattson's shares shall be pledged to secure a loan from
               Prudential Securities Incorporated to Mr. Mattson. In case of
               certain events constituting a default under the Pledge
               Agreement, the financial institution may sell the shares and
               receive the proceeds of any such sale up to the amount
               required to satisfy in full Mr. Mattson's obligations under
               the loan and the Pledge Agreement.

ITEM 7.        IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
               ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING
               COMPANY
               Not Applicable.

ITEM 8.        IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP
               Not Applicable.

ITEM 9.        NOTICE OF DISSOLUTION OF THE GROUP
               Not Applicable.

ITEM 10.       CERTIFICATION
               Not Applicable.



                               Page 4 of 5 pages
<PAGE>   5

- -------------------------------                 -------------------------------
      CUSIP NO. 57723100             13G               Page 5 of 5 Pages
- -------------------------------                 -------------------------------

                                    SIGNATURE

        After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

Date: February 10, 2000
                                       /s/ Brad Mattson
                                       ------------------------------------
                                       Brad Mattson


                               Page 5 of 5 pages




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