SUMMIT VENTURES IV LP
SC 13G/A, 1999-02-12
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<PAGE>   1
                                                          OMB APPROVAL
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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. 2 )*

                          Powerwave Technologies, Inc.
                                (Name of Issuer)

                         Common Stock, $.0001 par value
                         (Title of Class of Securities)

                                    739363109
                                 (CUSIP Number)

                                December 31, 1998
             (Date of Event Which Requires Filing of this Statement)

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

         / / Rule 13d-1(b)
         / / Rule 13d-1(c)
         /X/ 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 the
disclosures provided in a prior cover page.

The information required in 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 34 Pages
<PAGE>   2
CUSIP NO. 739363109                   13G                          PAGE 2 OF 34

- --------------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON

       I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                 Summit Ventures IV, L.P.

- --------------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                         (a) / /
                                                                         (b) / /

- --------------------------------------------------------------------------------
  3    SEC USE ONLY

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

                 Delaware limited partnership

- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER

                                         0 shares

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

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

                 0  shares

- --------------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* / /


- --------------------------------------------------------------------------------
11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                 0%

- --------------------------------------------------------------------------------
12     TYPE OF REPORTING PERSON *

                 PN
- --------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 2 of 34 Pages
<PAGE>   3
CUSIP NO. 739363109                   13G                          PAGE 3 OF 34

  1    NAME OF REPORTING PERSON

       I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                 Summit Partners IV, L.P.

  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                         (a) / /
                                                                         (b) / /

  3    SEC USE ONLY

  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                 Delaware limited partnership

                           5    SOLE VOTING POWER

                                         0 shares

       NUMBER OF
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                         0  shares
          EACH             7    SOLE DISPOSITIVE POWER
       REPORTING
         PERSON                          0 shares
          WITH             8    SHARED DISPOSITIVE POWER
                                         0 shares

  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                 0 shares

10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* / /


11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                 0%

12     TYPE OF REPORTING PERSON *

                 PN

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 3 of 34 Pages
<PAGE>   4
CUSIP NO. 739363109                   13G                          PAGE 4 OF 34

- --------------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON

       I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                 Summit Ventures III, L.P.

- --------------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                         (a) / /
                                                                         (b) / /

- --------------------------------------------------------------------------------
  3    SEC USE ONLY

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

                 Delaware limited partnership

- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER

                                         0 shares

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

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

                 0 shares

- --------------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* / /


- --------------------------------------------------------------------------------
11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                 0%

- --------------------------------------------------------------------------------
12     TYPE OF REPORTING PERSON *

                 PN

- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 4 of 34 Pages
<PAGE>   5
CUSIP NO. 739363109                   13G                          PAGE 5 OF 34

- --------------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON

       I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                 Summit Partners III, L.P.

- --------------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                         (a) / /
                                                                         (b) / /

- --------------------------------------------------------------------------------
  3    SEC USE ONLY

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

                 Delaware limited partnership

- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER
                                         0 shares
       NUMBER OF           -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                         0  shares
                           -----------------------------------------------------
          EACH             7    SOLE DISPOSITIVE POWER
       REPORTING
         PERSON                          0 shares
                           -----------------------------------------------------
          WITH             8    SHARED DISPOSITIVE POWER
                                         0 shares

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

                 0 shares

- --------------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* / /


- --------------------------------------------------------------------------------
11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                 0%

- --------------------------------------------------------------------------------
   12  TYPE OF REPORTING PERSON *

                 PN
- --------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 5 of 34 Pages
<PAGE>   6
CUSIP NO. 739363109                   13G                          PAGE 6 OF 34

- --------------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON

       I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                 Summit Investors II, L.P.

- --------------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                         (a) / /
                                                                         (b) / /

- --------------------------------------------------------------------------------
  3    SEC USE ONLY

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

                 Delaware limited partnership

- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER
                                         0 shares
       NUMBER OF           -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                         0 shares
                           -----------------------------------------------------
          EACH             7    SOLE DISPOSITIVE POWER
       REPORTING
         PERSON                          0 shares
                           -----------------------------------------------------
          WITH             8    SHARED DISPOSITIVE POWER
                                         0 shares

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

                 0 shares

- --------------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* / /


- --------------------------------------------------------------------------------
11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                 0%

- --------------------------------------------------------------------------------
   12  TYPE OF REPORTING PERSON *

                 PN
- --------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 6 of 34 Pages
<PAGE>   7
CUSIP NO. 739363109                   13G                          PAGE 7 OF 34

- --------------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON

       I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                 Stamps, Woodsum & Co. III

- --------------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                         (a) / /
                                                                         (b) / /

- --------------------------------------------------------------------------------
  3    SEC USE ONLY

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

                 Massachusetts general partnership

- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER
                                         0 shares
       NUMBER OF           -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                         0 shares
                           -----------------------------------------------------
          EACH             7    SOLE DISPOSITIVE POWER
       REPORTING
         PERSON                          0 shares
                           -----------------------------------------------------
          WITH             8    SHARED DISPOSITIVE POWER
                                         0 shares

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

                 0 shares

- --------------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* / /

- --------------------------------------------------------------------------------
11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                 0%

- --------------------------------------------------------------------------------
12     TYPE OF REPORTING PERSON *

                 PN

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 7 of 34 Pages
<PAGE>   8
CUSIP NO. 739363109                   13G                          PAGE 8 OF 34

- --------------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON

       I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                 Stamps, Woodsum & Co. IV

- --------------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                         (a) / /
                                                                         (b) / /

- --------------------------------------------------------------------------------
  3    SEC USE ONLY

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

                 Massachusetts general partnership

- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER
                                         0 shares
       NUMBER OF           -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                         0 shares
                           -----------------------------------------------------
          EACH             7    SOLE DISPOSITIVE POWER
       REPORTING
         PERSON                          0 shares
                           -----------------------------------------------------
          WITH             8    SHARED DISPOSITIVE POWER
                                         0 shares

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

                 0 shares

- --------------------------------------------------------------------------------
 10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* / /


- --------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                 0%

- --------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                 PN
- --------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 8 of 34 Pages
<PAGE>   9
CUSIP NO. 739363109                   13G                          PAGE 9 OF 34

- --------------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON

       I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                 E. Roe Stamps, IV

- --------------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                         (a) / /
                                                                         (b) / /

- --------------------------------------------------------------------------------
  3    SEC USE ONLY

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

                 United States

- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER
                                         0 shares
       NUMBER OF           -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                         0 shares
                           -----------------------------------------------------
          EACH             7    SOLE DISPOSITIVE POWER
       REPORTING        
         PERSON                          0 shares
                           -----------------------------------------------------
          WITH             8    SHARED DISPOSITIVE POWER
                                         0 shares

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

                 0 shares

- --------------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* / /


- --------------------------------------------------------------------------------
11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                 0%

- --------------------------------------------------------------------------------
12     TYPE OF REPORTING PERSON *

                 IN

- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 9 of 34 Pages
<PAGE>   10
CUSIP NO. 739363109                   13G                          PAGE 10 OF 34

- --------------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON

       I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                 Stephen G. Woodsum

- --------------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                         (a) / /
                                                                         (b) / /

- --------------------------------------------------------------------------------
  3    SEC USE ONLY

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

                 United States

- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER
                                         0 shares
       NUMBER OF           -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                         0 shares
                           -----------------------------------------------------
          EACH             7    SOLE DISPOSITIVE POWER
       REPORTING
         PERSON                          0 shares
                           -----------------------------------------------------
          WITH             8    SHARED DISPOSITIVE POWER
                                         0 shares

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

                 0 shares

- --------------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* / /


- --------------------------------------------------------------------------------
11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                 0%

- --------------------------------------------------------------------------------
12     TYPE OF REPORTING PERSON *

                 IN
- --------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                              Page 10 of 34 Pages
<PAGE>   11
CUSIP NO. 739363109                   13G                          PAGE 11 OF 34

- --------------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                Gregory M. Avis

- --------------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                        (a) / /
                                                                        (b) / /

- --------------------------------------------------------------------------------
  3    SEC USE ONLY

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

                United States
- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER
                                         0 shares
       NUMBER OF           -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY                       0 shares
        OWNED BY           -----------------------------------------------------
          EACH             7    SOLE DISPOSITIVE POWER
       REPORTING                         0 shares 
         PERSON            -----------------------------------------------------
          WITH             8    SHARED DISPOSITIVE POWER
                                         0 shares

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

                0 shares

- --------------------------------------------------------------------------------
 10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


- --------------------------------------------------------------------------------
 11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                0%

- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

                IN

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                              Page 11 of 34 Pages
<PAGE>   12
CUSIP NO. 739363109                   13G                          PAGE 12 OF 34

- --------------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                John A. Genest

- --------------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                        (a) / /
                                                                        (b) / /

- --------------------------------------------------------------------------------
  3    SEC USE ONLY

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

                United States

- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER
                                         0 shares
       NUMBER OF           -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY                       0 shares 
        OWNED BY           -----------------------------------------------------
          EACH             7    SOLE DISPOSITIVE POWER
       REPORTING                         0 shares
         PERSON            -----------------------------------------------------
          WITH             8    SHARED DISPOSITIVE POWER
                                         0 shares

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

                0 shares

- --------------------------------------------------------------------------------
 10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


- --------------------------------------------------------------------------------
 11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                0%

- --------------------------------------------------------------------------------
 12    TYPE OF REPORTING PERSON *

                IN

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                              Page 12 of 34 Pages
<PAGE>   13
CUSIP NO. 739363109                   13G                          PAGE 13 OF 34

- --------------------------------------------------------------------------------
  1     NAME OF REPORTING PERSON
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                 Martin J. Mannion

- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                         (a) / /
                                                                         (b) / /

- --------------------------------------------------------------------------------
  3     SEC USE ONLY

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

                 United States

- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER
                                         0 shares
       NUMBER OF           -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY                       0 shares
        OWNED BY           -----------------------------------------------------
          EACH             7    SOLE DISPOSITIVE POWER
       REPORTING                         0 shares
         PERSON            -----------------------------------------------------
          WITH             8    SHARED DISPOSITIVE POWER
                                         0 shares

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

                0 shares

- --------------------------------------------------------------------------------
 10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


- --------------------------------------------------------------------------------
 11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                0%

- --------------------------------------------------------------------------------
 12    TYPE OF REPORTING PERSON *

                 IN
- --------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                              Page 13 of 34 Pages
<PAGE>   14
CUSIP NO. 739363109                   13G                          PAGE 14 OF 34

- --------------------------------------------------------------------------------
  1     NAME OF REPORTING PERSON
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                 Bruce R. Evans

- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                         (a) / /
                                                                         (b) / /

- --------------------------------------------------------------------------------
  3     SEC USE ONLY

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

                 United States

- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER
                                         0 shares
       NUMBER OF           -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY                       0 shares
        OWNED BY           -----------------------------------------------------
          EACH             7    SOLE DISPOSITIVE POWER
       REPORTING                         0 shares
         PERSON            -----------------------------------------------------
          WITH             8    SHARED DISPOSITIVE POWER
                                         0 shares

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

                0 shares

- --------------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


- --------------------------------------------------------------------------------
11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                0%

- --------------------------------------------------------------------------------
12     TYPE OF REPORTING PERSON *

                IN

- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                              Page 14 of 34 Pages
<PAGE>   15
CUSIP NO. 739363109                   13G                          PAGE 15 OF 34

- --------------------------------------------------------------------------------
  1     NAME OF REPORTING PERSON
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                 Thomas S. Roberts

- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                         (a) / /
                                                                         (b) / /

- --------------------------------------------------------------------------------
  3     SEC USE ONLY

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

                 United States

- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER
                                         0 shares
       NUMBER OF           -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY                       0 shares
        OWNED BY           -----------------------------------------------------
          EACH             7    SOLE DISPOSITIVE POWER
       REPORTING                         0 shares
         PERSON            -----------------------------------------------------
          WITH             8    SHARED DISPOSITIVE POWER
                                         0 shares

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

                0 shares

- --------------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


- --------------------------------------------------------------------------------
11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                0%

- --------------------------------------------------------------------------------
12     TYPE OF REPORTING PERSON *

                IN

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                              Page 15 of 34 Pages
<PAGE>   16
CUSIP NO. 739363109                   13G                          PAGE 16 OF 34

- --------------------------------------------------------------------------------
  1     NAME OF REPORTING PERSON
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                 Walter G. Kortschak

- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                         (a) / /
                                                                         (b) / /

- --------------------------------------------------------------------------------
  3     SEC USE ONLY

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

                 United States

- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER
                                         0 shares
       NUMBER OF           -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY                       0 shares
        OWNED BY           -----------------------------------------------------
          EACH             7    SOLE DISPOSITIVE POWER
       REPORTING                         0 shares
         PERSON            -----------------------------------------------------
          WITH             8    SHARED DISPOSITIVE POWER
                                         0 shares

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

                0 shares
- --------------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


- --------------------------------------------------------------------------------
11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                0%

- --------------------------------------------------------------------------------
12     TYPE OF REPORTING PERSON *

                IN
- --------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                              Page 16 of 34 Pages
<PAGE>   17
CUSIP NO. 739363109                   13G                          PAGE 17 OF 34

- --------------------------------------------------------------------------------
  1     NAME OF REPORTING PERSON
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                 Joseph F. Trustey

- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                         (a) / /
                                                                         (b) / /

- --------------------------------------------------------------------------------
  3     SEC USE ONLY

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

                 United States

- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER
                                         0 shares
       NUMBER OF           -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY                       0 shares
        OWNED BY           -----------------------------------------------------
          EACH             7    SOLE DISPOSITIVE POWER
       REPORTING                         0 shares
         PERSON            -----------------------------------------------------
          WITH             8    SHARED DISPOSITIVE POWER
                                         0 shares

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

                0 shares

- --------------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


- --------------------------------------------------------------------------------
11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                0%

- --------------------------------------------------------------------------------
12     TYPE OF REPORTING PERSON *

                IN
- --------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                              Page 17 of 34 Pages
<PAGE>   18
                                  Schedule 13G

Item 1(a).        Name of Issuer: Powerwave Technologies, Inc.

Item 1(b).        Address of Issuer's Principal Executive Offices:
                  2026 McGaw Avenue, Irvine, CA 92614

Item 2(a).        Names of Persons Filing:  Summit Ventures IV, L.P., Summit
                  Partners IV, L.P., Summit Investors II, L.P., Summit Ventures
                  III, L.P., Summit Partners III, L.P., Stamps, Woodsum & Co.
                  III, Stamps, Woodsum & Co. IV and Messrs. E. Roe Stamps, IV,
                  Stephen G. Woodsum, Gregory M. Avis, John A. Genest, Martin J.
                  Mannion, Bruce R. Evans, Thomas S. Roberts, Walter G.
                  Kortschak and Joseph F. Trustey.

                  Summit Partners IV, L.P. is the sole general partner of Summit
                  Ventures IV, L.P. Stamps, Woodsum & Co. IV is the sole general
                  partner of Summit Partners IV, L.P. Summit Partners III, L.P.
                  is the sole general partner of Summit Ventures III, L.P.
                  Stamps, Woodsum & Co. III is the sole general partner of
                  Summit Partners III, L.P. Messrs. Stamps, Woodsum, Avis,
                  Genest, Mannion, Evans, Roberts and Kortschak are individual
                  general partners of Stamps, Woodsum & Co. IV, Summit Investors
                  II, L.P. and Stamps, Woodsum & Co. III. Mr. Trustey is an
                  individual general partner of Stamps, Woodsum & Co. IV.

                  As of December 31, 1998, Ernest K. Jacquet was no longer
                  affiliated with any of the "Entities" (as defined below).

Item 2(b).        Address of Principal Business Office or, if None,
                  Residence: The address of the principal business office of
                  Summit Ventures IV, L.P., Summit Partners IV, L.P., Summit
                  Ventures III, L.P., Summit Partners III, L.P., Summit
                  Investors II, L.P., Stamps, Woodsum & Co. IV, Stamps, Woodsum
                  & Co. III and Messrs. Stamps, Woodsum, Mannion, Genest, Evans,
                  Roberts and Trustey is Summit Partners, 600 Atlantic Avenue,
                  Boston, Massachusetts 02210. The address of the principal
                  business office of Messrs. Avis and Kortschak is Summit
                  Partners, 499 Hamilton Avenue, Palo Alto, California 94301.

Item 2(c).        Citizenship:  Each of Summit Ventures IV, L.P., Summit
                  Partners IV, L.P., Summit Ventures III, L.P., Summit Partners
                  III, L.P. and Summit Investors II, L.P. is a limited
                  partnership organized under the laws of the State of Delaware.
                  Each of Stamps, Woodsum & Co. IV and Stamps, Woodsum & Co. III
                  is a general partnership organized under the laws of the
                  Commonwealth of Massachusetts. Each of Messrs. Stamps,


                              Page 18 of 34 Pages
<PAGE>   19
                  Woodsum, Avis, Mannion, Genest, Evans, Roberts, Kortschak and
                  Trustey is a United States citizen.

Item 2(d).        Title of Class of Securities:  Common Stock, $.0001 par value
                  per share.

Item 2(e).        CUSIP Number:739363109

Item 3.           If this statement is filed pursuant to Rules 13d-1(b), or
                  13d-2(b), check whether the person filing is a:

                  Not Applicable.

Item 4.           Ownership.

                  Not Applicable.

Item 5.           Ownership of Five Percent or Less of a Class.

                  [ X ] Each of Summit Ventures IV, L.P., Summit Partners IV,
                  L.P., Summit Investors II, L.P., Summit Ventures III, L.P.,
                  Summit Partners III, L.P., Stamps, Woodsum & Co. III and
                  Stamps, Woodsum & Co. IV (individually an "Entity" and
                  collectively the "Entities") and Messrs. Stamps, Woodsum,
                  Avis, Genest, Mannion, Evans, Roberts, Kortschak and Trustey
                  may be deemed to own beneficially 0 shares of Common Stock as
                  of December 31, 1998, which is five percent or less of the
                  Common Stock of Powerwave Technologies, Inc.

Item 6.           Ownership of More than Five Percent on Behalf of Another
                  Person.

                  Not Applicable.

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.  The reporting persons expressly disclaim
                  membership in a "group" as defined in Rule 13d-1(b)(ii)(H).

Item 9.           Notice of Dissolution of Group.

                  Not Applicable.


                              Page 19 of 34 Pages
<PAGE>   20
Item 10.          Certification.

                  Not Applicable. This statement on Schedule 13G is not filed
                  pursuant to Rule 13d-1(b).


                              Page 20 of 34 Pages
<PAGE>   21
                                   SIGNATURES

      After reasonable inquiry and to the best of our knowledge and belief, we
certify that the information set forth in this statement is true, complete and
correct. We also hereby agree to file this statement jointly pursuant to the
Agreement listed on Exhibit 1 hereto.

Dated: February 9, 1999

SUMMIT VENTURES IV, L.P.                     STAMPS, WOODSUM & CO. IV

By: Summit Partners IV, L.P.                 By:      *
                                                 ------------------------
                                                 E. Roe Stamps, IV
By: Stamps, Woodsum & Co. IV                     General Partner

                                             SUMMIT VENTURES III, L.P.

    By:           *
        ----------------------
        E. Roe Stamps, IV                    By: Summit Partners III, L.P.
        General Partner
                                             By: Stamps, Woodsum & Co. III

SUMMIT INVESTORS II, L.P.

                                             By:      *
                                                 ----------------------
                                                 E. Roe Stamps, IV
By: /s/ John A. Genest                           General Partner
    ----------------------
    General Partner

                                             SUMMIT PARTNERS III, L.P.

SUMMIT PARTNERS IV, L.P.

                                             By: Stamps, Woodsum & Co. III

By: Stamps, Woodsum & Co. IV

                                                 By:           *
                                                      ----------------------
                                                      E. Roe Stamps, IV
    By:           *                                   General Partner
        ----------------------
        E. Roe Stamps, IV
        General Partner

                                             STAMPS, WOODSUM & CO. III

                                             By:      *
                                                 ----------------------
                                                 E. Roe Stamps, IV
                                                 General Partner


                              Page 21 of 34 Pages
<PAGE>   22
         *                                                       *
- -------------------                                     ---------------------
Bruce R. Evans                                          E. Roe Stamps, IV

         *                                                       *
- -------------------                                     ---------------------
Walter G. Kortschak                                     Stephen G. Woodsum

         *                                                       *
- -------------------                                     ---------------------
Thomas S. Roberts                                       Gregory M. Avis

         *                                                       *
- -------------------                                     ---------------------
Joseph F. Trustey                                       Martin J. Mannion

                                                        /s/ John A. Genest
                                                        ---------------------
                                                        John A. Genest

                                                        *By: /s/ John A. Genest
                                                             -------------------
                                                             John A. Genest,
                                                             Attorney-in-Fact

* Pursuant to Powers of Attorney on file with the Commission, which Powers of
Attorney are incorporated herein by reference. Copies of such Powers of Attorney
are attached hereto as Exhibit 2.


                              Page 22 of 34 Pages

<PAGE>   1
                                                                       Exhibit 1

                                    AGREEMENT

         Pursuant to Rule 13d-1(f)(1) under the Securities Exchange Act of 1934,
the undersigned hereby agree that only one statement containing the information
required by Schedule 13G need be filed with respect to the ownership by each of
the undersigned of shares of Common Stock of Powerwave Technologies, Inc.

         This agreement may be executed in any number of counterparts, each of
which shall be deemed an original.

         EXECUTED this 9th day of February, 1999.

SUMMIT VENTURES IV, L.P.                     STAMPS, WOODSUM & CO IV

By: Summit Partners IV, L.P.                 By:      *
                                                 ---------------------
                                                 E. Roe Stamps, IV
By: Stamps, Woodsum & Co. IV                     General Partner

                                             SUMMIT VENTURES III, L.P.

    By:           *
         ---------------------
         E. Roe Stamps, IV                   By: Summit Partners III, L.P.
         General Partner

                                             By: Stamps, Woodsum & Co. III

SUMMIT INVESTORS II, L.P.

                                             By:      *
                                                 ---------------------
                                                 E. Roe Stamps, IV
By: /s/ John A. Genest                           General Partner
    ---------------------
    General Partner

                                             SUMMIT PARTNERS III, L.P.

SUMMIT PARTNERS IV, L.P.

                                             By: Stamps, Woodsum & Co. III

By: Stamps, Woodsum & Co. IV

                                             By:      *
                                                 ---------------------
                                                 E. Roe Stamps, IV
    By: /s/ John A. Genest                       General Partner
        ---------------------
        E. Roe Stamps, IV
        General Partner                      STAMPS, WOODSUM & CO. III

                                             By:      *
                                                 ---------------------
                                                 E. Roe Stamps, IV
                                                 General Partner


                              Page 23 of 34 Pages
<PAGE>   2
         *                                                       *
- -------------------                                     ---------------------
Bruce R. Evans                                          E. Roe Stamps, IV

         *                                                       *
- -------------------                                     ---------------------
Walter G. Kortschak                                     Stephen G. Woodsum

         *                                                       *
- -------------------                                     ---------------------
Thomas S. Roberts                                       Gregory M. Avis

         *                                                       *
- -------------------                                     ---------------------
Joseph F. Trustey                                       Martin J. Mannion

                                                        /s/ John A. Genest
                                                        ---------------------
                                                        John A. Genest

                                                        *By: /s/ John A. Genest
                                                             ------------------
                                                             John A. Genest,
                                                             Attorney-in-Fact

* Pursuant to Powers of Attorney on file with the Commission, which Powers of
Attorney are incorporated herein by reference. Copies of such Powers of Attorney
are attached hereto as Exhibit 2.


                              Page 24 of 34 Pages

<PAGE>   1
                                                                       Exhibit 2

                                POWER OF ATTORNEY

         KNOW ALL MEN BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints each and any of E. Roe Stamps, IV,
Stephen G. Woodsum and John A. Genest his true and lawful attorney-in-fact and
agent, with full power of substitution and resubstitution, for him and in his
name, place and stead, in any and all capacities (until revoked in writing) to
sign any and all instruments, certificates and documents required to be executed
on behalf of himself individually or on behalf of each or any of Summit
Ventures, L.P., Summit Partners, L.P., Stamps, Woodsum & Co., Summit Partners'
Holdings, L.P., Summit Ventures II, L.P., Summit Partners II, L.P., Stamps,
Woodsum & Co. II, SV Eurofund C.V., SV International, L.P., Stamps, Woodsum
International & Co., Summit Investors, L.P., Summit Investors II, L.P., Summit
Investors III, L.P., Summit Ventures III, L.P., Summit Partners III, L.P.,
Stamps, Woodsum & Co. III, Summit Ventures IV, L.P., Summit Partners IV, L.P.,
Stamps, Woodsum & Co., IV, Summit Subordinated Debt Fund, L.P., Summit Partners
SD, L.P., SW Management Corp., Summit Management Co., Summit Subordinated Debt
Fund II, L.P., and Summit Partners SD II, LLC, pursuant to sections 13 and 16 of
the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and any
and all regulations promulgated thereunder, and to file the same, with all
exhibits thereto, and any other documents in connection therewith, with the
Securities and Exchange Commission, and with any other entity when and if such
is mandated by the Exchange Act or by the By-laws of the National Association of
Securities Dealers, granting unto said attorney-in-fact and agent full power and
authority to do and perform each and every act and thing requisite and necessary
fully to all intents and purposes as she might or could do in person thereby
ratifying and confirming all that said attorney-in-fact and agent, or her
substitute or substitutes, may lawfully do or cause to be done by virtue hereof.


                              Page 25 of 34 Pages
<PAGE>   2
         IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
10th day of February, 1997.

                                                     /s/  E. Roe Stamps, IV
                                                     E. Roe Stamps, IV

Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )

         On this 10th day of February, 1997, before me personally came E. Roe
Stamps, IV, known to me to be the person described and who executed the
foregoing instrument that he acknowledged that he executed the same.

[Notary Seal]

                                         /s/  Cynthia R. Freidman
                                         Notary Public

                                         My Commission expires: October 20, 2000


                              Page 26 of 34 Pages
<PAGE>   3
         IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
10th day of February, 1997.

                                                     /s/  Stephen G. Woodsum
                                                     Stephen G. Woodsum

Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )

         On this 10th day of February, 1997, before me personally came Stephen
G. Woodsum, known to me to be the person described and who executed the
foregoing instrument that he acknowledged that he executed the same.

[Notary Seal]

                                         /s/  Cynthia R. Freidman
                                         Notary Public

                                         My Commission expires: October 20, 2000


                              Page 27 of 34 Pages
<PAGE>   4
         IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
10th day of February, 1997.

                                                     /s/  Martin J. Mannion
                                                     Martin J. Mannion

Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )

         On this 10th day of February, 1997, before me personally came Martin J.
Mannion, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]

                                         /s/  Cynthia R. Freidman
                                         Notary Public

                                         My Commission expires: October 20, 2000


                              Page 28 of 34 Pages
<PAGE>   5
         IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
10th day of February, 1997.

                                                     /s/  John A. Genest
                                                     John A. Genest

Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )

         On this 10th day of February, 1997, before me personally came John A.
Genest, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]

                                         /s/  Cynthia R. Freidman
                                         Notary Public

                                         My Commission expires: October 20, 2000


                              Page 29 of 34 Pages
<PAGE>   6
         IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
10th day of February, 1997.

                                                     /s/  Gregory M. Avis
                                                     Gregory M. Avis

State of California                         )
                                            ) ss:
County of Santa Clara                       )

         On this 3rd day of February, 1997, before me personally came Stephen G.
Woodsum, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]

                                             /s/  Katherine C. Ely
                                             Notary Public

                                             My Commission expires: May 28, 2000


                              Page 30 of 34 Pages
<PAGE>   7
         IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
10th day of February, 1997.

                                                     /s/  Thomas S. Roberts
                                                     Thomas S. Roberts

Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )

         On this 10th day of February, 1997, before me personally came Thomas S.
Roberts, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]

                                         /s/ Cynthia R. Freidman
                                         Notary Public

                                         My Commission expires: October 20, 2000


                              Page 31 of 34 Pages
<PAGE>   8
         IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
10th day of February, 1997.

                                                     /s/  Bruce R. Evans
                                                     Bruce R. Evans

Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )

         On this 10th day of February, 1997, before me personally came Bruce R.
Evans, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]

                                         /s/ Cynthia R. Freidman
                                         Notary Public

                                         My Commission expires: October 20, 2000


                              Page 32 of 34 Pages
<PAGE>   9
         IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
10th day of February, 1997.

                                                     /s/  Walter G. Kortschak
                                                     Walter G. Kortschak

State of California                         )
                                            ) ss:
County of Santa Clara                       )

         On this 3rd day of February, 1997, before me personally came Walter G.
Kortschak, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]

                                             /s/ Katherine C. Ely
                                             Notary Public

                                             My Commission expires: May 28, 2000


                              Page 33 of 34 Pages
<PAGE>   10
         IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
10th day of February, 1997.

                                                     /s/  Joseph F. Trustey
                                                     Joseph F. Trustey

Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )

         On this 10th day of February, 1997, before me personally came Joseph F.
Trustey, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]

                                         /s/ Cynthia R. Freidman
                                         Notary Public

                                         My Commission expires: October 20, 2000


                              Page 34 of 34 Pages


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