ENTERPRISE PARTNERS IV LP
SC 13G, 2000-03-09
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<PAGE>   1
                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549




                                            ------------------------------------
                                            OMB APPROVAL
                                            ------------------------------------
                                            OMB Number:    3235-0145
                                            Expires:      August 31, 1999
                                            Estimated average burden
                                            hours per response........14.90
                                            ------------------------------------

                                  SCHEDULE 13G


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

                                STAMPS.COM, INC.
                          -----------------------------
                                (Name of Issuer)




                                  COMMON STOCK
                        ---------------------------------
                         (Title of Class of Securities)




                                   8582857101
                       ----------------------------------
                                 (CUSIP Number)





                                December 31, 1999
        ----------------------------------------------------------------
             (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).

POTENTIAL PERSONS WHO ARE TO RESPOND TO THE COLLECTION OF INFORMATION CONTAINED
IN THIS FORM ARE NOT REQUIRED TO RESPOND UNLESS THE FORM DISPLAYS A CURRENTLY
VALID OMB CONTROL NUMBER.


<PAGE>   2

<TABLE>
<CAPTION>
  ------------------------------------------                                              --------------------------------------
  CUSIP NO. 8582857 101                                          13G                      PAGE   2   OF  15  PAGES
                                                                                               -----    ----
  ------------------------------------------                                              --------------------------------------



<S>         <C>
 ---------- --------------------------------------------------------------------------------------------------------------------
 1          NAME OF REPORTING PERSON
            I.R.S. IDENTIFICATION NO(S). OF ABOVE PERSON(S) (ENTITIES ONLY)

            ENTERPRISE PARTNERS IV, L.P.        33-0761558
 ---------- --------------------------------------------------------------------------------------------------------------------
 2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
            (a)
            (b) [X]
 ---------- --------------------------------------------------------------------------------------------------------------------
 3          SEC USE ONLY
 ---------- --------------------------------------------------------------------------------------------------------------------
 4          CITIZENSHIP OR PLACE OF ORGANIZATION

            DELAWARE
 ----------------------------- ----- -------------------------------------------------------------------------------------------
          NUMBER OF            5     SOLE VOTING POWER

            SHARES                   4,987,732
                               ----- -------------------------------------------------------------------------------------------
         BENEFICIALLY          6     SHARED VOTING POWER

           OWNED BY                  0
                               ----- -------------------------------------------------------------------------------------------
             EACH              7     SOLE DISPOSITIVE POWER

          REPORTING                  4,987,732
                               ----- -------------------------------------------------------------------------------------------
            PERSON             8     SHARED DISPOSITIVE POWER

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

            4,987,732
 ---------- --------------------------------------------------------------------------------------------------------------------
 10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

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

            12.2%
 ---------- --------------------------------------------------------------------------------------------------------------------
 12         TYPE OF REPORTING PERSON*

            PN
 ---------- --------------------------------------------------------------------------------------------------------------------
</TABLE>


                      *SEE INSTRUCTION BEFORE FILLING OUT!


<PAGE>   3


<TABLE>
<CAPTION>
  ------------------------------------------                                              --------------------------------------
  CUSIP NO. 8582857 101                                          13G                      PAGE   3   OF  15  PAGES
                                                                                               -----    ----
  ------------------------------------------                                              --------------------------------------


<S>         <C>
 ---------- --------------------------------------------------------------------------------------------------------------------
 1          NAME OF REPORTING PERSON
            I.R.S. IDENTIFICATION NO(S). OF ABOVE PERSON(S) (ENTITIES ONLY)

            ENTERPRISE PARTNERS IV ASSOCIATES, L.P.        33-0761557
 ---------- --------------------------------------------------------------------------------------------------------------------
 2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
            (a)
            (b) [X]
 ---------- --------------------------------------------------------------------------------------------------------------------
 3          SEC USE ONLY
 ---------- --------------------------------------------------------------------------------------------------------------------
 4          CITIZENSHIP OR PLACE OF ORGANIZATION

            DELAWARE
 ----------------------------- ----- -------------------------------------------------------------------------------------------
          NUMBER OF            5     SOLE VOTING POWER

            SHARES                   433,716
                               ----- -------------------------------------------------------------------------------------------
         BENEFICIALLY          6     SHARED VOTING POWER

           OWNED BY                  0
                               ----- -------------------------------------------------------------------------------------------
             EACH              7     SOLE DISPOSITIVE POWER

          REPORTING                  433,716
                               ----- -------------------------------------------------------------------------------------------
            PERSON             8     SHARED DISPOSITIVE POWER

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

            433,716
 ---------- --------------------------------------------------------------------------------------------------------------------
 10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

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

            1.1%
 ---------- --------------------------------------------------------------------------------------------------------------------
 12         TYPE OF REPORTING PERSON*

            PN
 ---------- --------------------------------------------------------------------------------------------------------------------
</TABLE>


                      *SEE INSTRUCTION BEFORE FILLING OUT!


<PAGE>   4


<TABLE>
<CAPTION>
  ------------------------------------------                                              --------------------------------------
  CUSIP NO. 8582857 101                                          13G                      PAGE   4   OF  15  PAGES
                                                                                               -----    ----
  ------------------------------------------                                              --------------------------------------


<S>         <C>
 ---------- --------------------------------------------------------------------------------------------------------------------
 1          NAME OF REPORTING PERSON
            I.R.S. IDENTIFICATION NO(S). OF ABOVE PERSON(S) (ENTITIES ONLY)

            ENTERPRISE MANAGEMENT PARTNERS IV, L.P.        33-07681560
 ---------- --------------------------------------------------------------------------------------------------------------------
 2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
            (a)
            (b) [X]
 ---------- --------------------------------------------------------------------------------------------------------------------
 3          SEC USE ONLY
 ---------- --------------------------------------------------------------------------------------------------------------------
 4          CITIZENSHIP OR PLACE OF ORGANIZATION

            DELAWARE
 ----------------------------- ----- -------------------------------------------------------------------------------------------
          NUMBER OF            5     SOLE VOTING POWER

            SHARES                   5,421,448
                               ----- -------------------------------------------------------------------------------------------
         BENEFICIALLY          6     SHARED VOTING POWER

           OWNED BY                  0
                               ----- -------------------------------------------------------------------------------------------
             EACH              7     SOLE DISPOSITIVE POWER

          REPORTING                  5,421,448
                               ----- -------------------------------------------------------------------------------------------
            PERSON             8     SHARED DISPOSITIVE POWER

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

            5,421,448
 ---------- --------------------------------------------------------------------------------------------------------------------
 10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

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

            13.2%
 ---------- --------------------------------------------------------------------------------------------------------------------
 12         TYPE OF REPORTING PERSON*

            PN
 ---------- --------------------------------------------------------------------------------------------------------------------
</TABLE>


                      *SEE INSTRUCTION BEFORE FILLING OUT!


<PAGE>   5

<TABLE>
<CAPTION>
  ------------------------------------------                                              --------------------------------------
  CUSIP NO. 8582857 101                                          13G                      PAGE   5   OF  15  PAGES
                                                                                               -----    ----
  ------------------------------------------                                              --------------------------------------


<S>         <C>
 ---------- --------------------------------------------------------------------------------------------------------------------
 1          NAME OF REPORTING PERSON
            I.R.S. IDENTIFICATION NO(S). OF ABOVE PERSON(S) (ENTITIES ONLY)

            ANDREW E. SENYEI
 ---------- --------------------------------------------------------------------------------------------------------------------
 2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
            (a)
            (b) [X]
 ---------- --------------------------------------------------------------------------------------------------------------------
 3          SEC USE ONLY
 ---------- --------------------------------------------------------------------------------------------------------------------
 4          CITIZENSHIP OR PLACE OF ORGANIZATION

            USA
 ----------------------------- ----- -------------------------------------------------------------------------------------------
          NUMBER OF            5     SOLE VOTING POWER

            SHARES                   0
                               ----- -------------------------------------------------------------------------------------------
         BENEFICIALLY          6     SHARED VOTING POWER

           OWNED BY                  5,421,448
                               ----- -------------------------------------------------------------------------------------------
             EACH              7     SOLE DISPOSITIVE POWER

          REPORTING                  0
                               ----- -------------------------------------------------------------------------------------------
            PERSON             8     SHARED DISPOSITIVE POWER

            WITH:                    5,421,448
 ----------------------------- -------------------------------------------------------------------------------------------------
 9          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            5,421,448(1)
 ---------- --------------------------------------------------------------------------------------------------------------------
 10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

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

            13.2%
 ---------- --------------------------------------------------------------------------------------------------------------------
 12         TYPE OF REPORTING PERSON*

            IN
 ---------- --------------------------------------------------------------------------------------------------------------------
</TABLE>


                      *SEE INSTRUCTION BEFORE FILLING OUT!

(1)The sole general partner of Enterprise Partners IV and Enterprise Partners IV
Associates is Enterprise Management Partners IV. Enterprise Management Partners
IV may be deemed to beneficially own the shares owned by Enterprise Partners IV
and Enterprise Partners IV Associates. Andrew E. Senyei is a general partner of
Enterprise Management Partners IV and may be deemed to be the indirect
beneficial owner of the shares owned by Enterprise Partners IV and Enterprise
Partners IV Associates. Mr. Senyei disclaims beneficial ownership of all shares
held by Enterprise Partners IV and Enterprise Partners IV Associates, except to
the extent of his pecuniary interest therein.
<PAGE>   6

<TABLE>
<CAPTION>
  ------------------------------------------                                              --------------------------------------
  CUSIP NO. 8582857 101                                          13G                      PAGE   6   OF  15  PAGES
                                                                                               -----    ----
  ------------------------------------------                                              --------------------------------------


<S>         <C>
 ---------- --------------------------------------------------------------------------------------------------------------------
 1          NAME OF REPORTING PERSON
            I.R.S. IDENTIFICATION NO(S). OF ABOVE PERSON(S) (ENTITIES ONLY)

            JAMES H. BERGLUND
 ---------- --------------------------------------------------------------------------------------------------------------------
 2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
            (a)
            (b) [X]
 ---------- --------------------------------------------------------------------------------------------------------------------
 3          SEC USE ONLY
 ---------- --------------------------------------------------------------------------------------------------------------------
 4          CITIZENSHIP OR PLACE OF ORGANIZATION

            USA
 ----------------------------- ----- -------------------------------------------------------------------------------------------
          NUMBER OF            5     SOLE VOTING POWER

            SHARES                   0
                               ----- -------------------------------------------------------------------------------------------
         BENEFICIALLY          6     SHARED VOTING POWER

           OWNED BY                  5,421,448
                               ----- -------------------------------------------------------------------------------------------
             EACH              7     SOLE DISPOSITIVE POWER

          REPORTING                  0
                               ----- -------------------------------------------------------------------------------------------
            PERSON             8     SHARED DISPOSITIVE POWER

            WITH:                    5,421,448
 ----------------------------- -------------------------------------------------------------------------------------------------
 9          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            5,421,448(2)
 ---------- --------------------------------------------------------------------------------------------------------------------
 10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

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

            13.2%
 ---------- --------------------------------------------------------------------------------------------------------------------
 12         TYPE OF REPORTING PERSON*

            IN
 ---------- --------------------------------------------------------------------------------------------------------------------
</TABLE>


                      *SEE INSTRUCTION BEFORE FILLING OUT!

(2)The sole general partner of Enterprise Partners IV and Enterprise Partners IV
Associates is Enterprise Management Partners IV. Enterprise Management Partners
IV may be deemed to beneficially own the shares owned by Enterprise Partners IV
and Enterprise Partners IV Associates. James H. Berglund is a general partner of
Enterprise Management Partners IV and may be deemed to be the indirect
beneficial owner of the shares owned by Enterprise Partners IV and Enterprise
Partners IV Associates. Mr. Berglund disclaims beneficial ownership of all
shares held by Enterprise Partners IV and Enterprise Partners IV Associates,
except to the extent of his pecuniary interest therein.
<PAGE>   7
<TABLE>
<CAPTION>
  ------------------------------------------                                              --------------------------------------
  CUSIP NO. 8582857 101                                          13G                      PAGE   7   OF  15  PAGES
                                                                                               -----    ----
  ------------------------------------------                                              --------------------------------------


<S>         <C>
 ---------- --------------------------------------------------------------------------------------------------------------------
 1          NAME OF REPORTING PERSON
            I.R.S. IDENTIFICATION NO(S). OF ABOVE PERSON(S) (ENTITIES ONLY)

            RONALD TAYLOR
 ---------- --------------------------------------------------------------------------------------------------------------------
 2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
            (a)
            (b) [X]
 ---------- --------------------------------------------------------------------------------------------------------------------
 3          SEC USE ONLY
 ---------- --------------------------------------------------------------------------------------------------------------------
 4          CITIZENSHIP OR PLACE OF ORGANIZATION

            USA
 ----------------------------- ----- -------------------------------------------------------------------------------------------
          NUMBER OF            5     SOLE VOTING POWER

            SHARES                   0
                               ----- -------------------------------------------------------------------------------------------
         BENEFICIALLY          6     SHARED VOTING POWER

           OWNED BY                  5,421,448
                               ----- -------------------------------------------------------------------------------------------
             EACH              7     SOLE DISPOSITIVE POWER

          REPORTING                  0
                               ----- -------------------------------------------------------------------------------------------
            PERSON             8     SHARED DISPOSITIVE POWER

            WITH:                    5,421,448
 ----------------------------- -------------------------------------------------------------------------------------------------
 9          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            5,421,448(3)
 ---------- --------------------------------------------------------------------------------------------------------------------
 10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

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

            13.2%
 ---------- --------------------------------------------------------------------------------------------------------------------
 12         TYPE OF REPORTING PERSON*

            IN
 ---------- --------------------------------------------------------------------------------------------------------------------
</TABLE>


                      *SEE INSTRUCTION BEFORE FILLING OUT!

(3) The sole general partner of Enterprise Partners IV and Enterprise Partners
IV Associates is Enterprise Management Partners IV. Enterprise Management
Partners IV may be deemed to beneficially own the shares owned by Enterprise
Partners IV and Enterprise Partners IV Associates. Ronald Taylor is a general
partner of Enterprise Management Partners IV and may be deemed to be the
indirect beneficial owner of the shares owned by Enterprise Partners IV and
Enterprise Partners IV Associates. Mr. Taylor disclaims beneficial ownership of
all shares held by Enterprise Partners IV and Enterprise Partners IV Associates,
except to the extent of his pecuniary interest therein.
<PAGE>   8

<TABLE>
<CAPTION>
  ------------------------------------------                                              --------------------------------------
  CUSIP NO. 8582857 101                                          13G                      PAGE   8   OF  15  PAGES
                                                                                               -----    ----
  ------------------------------------------                                              --------------------------------------


<S>         <C>
 ---------- --------------------------------------------------------------------------------------------------------------------
 1          NAME OF REPORTING PERSON
            I.R.S. IDENTIFICATION NO(S). OF ABOVE PERSON(S) (ENTITIES ONLY)

            WILLIAM R. STENSRUD
 ---------- --------------------------------------------------------------------------------------------------------------------
 2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
            (a)
            (b) [X]
 ---------- --------------------------------------------------------------------------------------------------------------------
 3          SEC USE ONLY
 ---------- --------------------------------------------------------------------------------------------------------------------
 4          CITIZENSHIP OR PLACE OF ORGANIZATION

            USA
 ----------------------------- ----- -------------------------------------------------------------------------------------------
          NUMBER OF            5     SOLE VOTING POWER

            SHARES                   0
                               ----- -------------------------------------------------------------------------------------------
         BENEFICIALLY          6     SHARED VOTING POWER

           OWNED BY                  5,421,448
                               ----- -------------------------------------------------------------------------------------------
             EACH              7     SOLE DISPOSITIVE POWER

          REPORTING                  0
                               ----- -------------------------------------------------------------------------------------------
            PERSON             8     SHARED DISPOSITIVE POWER

            WITH:                    5,421,448
 ----------------------------- -------------------------------------------------------------------------------------------------
 9          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            5,421,448(4)
 ---------- --------------------------------------------------------------------------------------------------------------------
 10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

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

            13.2%
 ---------- --------------------------------------------------------------------------------------------------------------------
 12         TYPE OF REPORTING PERSON*

            IN
 ---------- --------------------------------------------------------------------------------------------------------------------
</TABLE>


                      *SEE INSTRUCTION BEFORE FILLING OUT!

(4)The sole general partner of Enterprise Partners IV and Enterprise Partners IV
Associates is Enterprise Management Partners IV. Enterprise Management Partners
IV may be deemed to beneficially own the shares owned by Enterprise Partners IV
and Enterprise Partners IV Associates. William R. Stensrud is a general partner
of Enterprise Management Partners IV and may be deemed to be the indirect
beneficial owner of the shares owned by Enterprise Partners IV and Enterprise
Partners IV Associates. Mr. Stensrud disclaims beneficial ownership of all
shares held by Enterprise Partners IV and Enterprise Partners IV Associates,
except to the extent of his pecuniary interest therein.
<PAGE>   9


ITEM 1.

          (a)       Name of Issuer: STAMPS.COM, INC.
          (b)       Address of Issuer's Principal Executive Offices:
                    3420 OCEAN PARK BOULEVARD, SUITE 1040, SANTA MONICA,
                    CALIFORNIA 90405
ITEM 2.

          (a)       Name of Person Filing: ENTERPRISE PARTNERS IV, L.P. ("EPIV")
                    ENTERPRISE PARTNERS IV ASSOCIATES, L.P. ("EPIVA")
                    ENTERPRISE MANAGEMENT PARTNERS IV, L.P. ("EMPIV")
                    ANDREW E. SENYEI ("AES")
                    JAMES H. BERGLUND ("JHB")
                    RONALD TAYLOR ("RT")
                    WILLIAM R. STENSRUD ("WRS")

          (b)       Address of Principal Business Office or, if none, Residence:
                    5000 BIRCH STREET, SUITE 6200, NEWPORT BEACH, CALIFORNIA
                    92660
          (c)       Citizenship: ENTITIES:
                    EPIV - DELAWARE
                    EPIVA - DELAWARE
                    EMPIV - DELAWARE

                    INDIVIDUALS:
                    AES - USA
                    JHB - USA
                    RT - USA
                    WRS - USA

          (d)       Title of Class of Securities: COMMON STOCK
          (e)       CUSIP Number: 8582857 101

ITEM 3.   NOT APPLICABLE


<PAGE>   10



ITEM 4.   OWNERSHIP

          (a)       Provide the following information regarding the aggregate
                    number and percentage of the class of securities of the
                    issuer identified in Item 1.

<TABLE>
<CAPTION>
                              EPIV             EPIVA        EMPIV          AES            JHB            RT             WRS

<S>                           <C>              <C>          <C>            <C>            <C>            <C>            <C>
(a) AMOUNT BENEFICIALLY       4,987,732        433,716      5,421,448    5,421,448(1)   5,421,448(2)   5,421,448(3)   5,421,448(4)
OWNED:
(b) PERCENT OF CLASS:               9.7%           1.1%          13.2%        13.2%          13.2%          13.2%          13.2%
(c) NUMBER OF SHARES AS
TO WHICH SUCH PERSON HAS:
(i) SOLE POWER TO VOTE        3,990,186        346,973      4,337,159            0              0              0              0
OR DIRECT THE VOTE:
(ii) SHARED POWER TO                  0              0              0    5,421,448      5,421,448      5,421,448      5,421,448
VOTE OR TO DIRECT THE
VOTE:
(iii) SOLE POWER TO           3,990,186        346,973      4,337,159            0              0              0              0
DISPOSE OR TO DIRECT THE
DISPOSITION OF:
(iv) SHARED POWER TO                  0              0              0    5,421,448      5,421,448      5,421,448      5,421,448
DISPOSE OR TO DIRECT THE
DISPOSITION OF:
</TABLE>


ITEM 5.   OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS:

          NOT APPLICABLE

- ---------------------------------
(1) The sole general partner of Enterprise Partners IV and Enterprise
Partners IV Associates is Enterprise Management Partners IV. Enterprise
Management Partners IV may be deemed to beneficially own the shares owned by
Enterprise Partners IV and Enterprise Partners IV Associates. Andrew E. Senyei
is a general partner of Enterprise Management Partners IV and may be deemed to
be the indirect beneficial owner of the shares owned by Enterprise Partners IV,
and Enterprise Partners IV Associates. Mr. Senyei disclaims beneficial ownership
of all shares held by Enterprise Partners IV and Enterprise Partners IV
Associates, except to the extent of his pecuniary interest therein.

(2) The sole general partner of Enterprise Partners IV and Enterprise Partners
IV Associates is Enterprise Management Partners IV. Enterprise Management
Partners IV may be deemed to beneficially own the shares owned by Enterprise
Partners IV and Enterprise Partners IV Associates. Jams H. Berglund is a general
partner of Enterprise Management Partners IV and may be deemed to be the
indirect beneficial owner of the shares owned by Enterprise Partners IV, and
Enterprise Partners IV Associates. Mr. Berglund disclaims beneficial ownership
of all shares held by Enterprise Partners IV and Enterprise Partners IV
Associates, except to the extent of his pecuniary interest therein.

(3) The sole general partner of Enterprise Partners IV and Enterprise Partners
IV Associates is Enterprise Management Partners IV. Enterprise Management
Partners IV may be deemed to beneficially own the shares owned by Enterprise
Partners IV and Enterprise Partners IV Associates. Ronald Taylor is a general
partner of Enterprise Management Partners IV and may be deemed to be the
indirect beneficial owner of the shares owned by Enterprise Partners IV, and
Enterprise Partners IV Associates. Mr. Taylor disclaims beneficial ownership of
all shares held by Enterprise Partners IV and Enterprise Partners IV Associates,
except to the extent of his pecuniary interest therein.

(4) The sole general partner of Enterprise Partners IV and Enterprise Partners
IV Associates is Enterprise Management Partners IV. Enterprise Management
Partners IV may be deemed to beneficially own the shares owned by Enterprise
Partners IV and Enterprise Partners IV Associates. William R. Stensrud is a
general partner of Enterprise Management Partners IV and may be deemed to be the
indirect beneficial owner of the shares owned by Enterprise Partners IV, and
Enterprise Partners IV Associates. Mr. Stensrud disclaims beneficial ownership
of all shares held by Enterprise Partners IV and Enterprise Partners IV
Associates, except to the extent of his pecuniary interest therein.


<PAGE>   11


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:

          NO REPORTING PERSON IS A MEMBER OF A GROUP AS DEFINED IN SECTION
          240.13d-1(b)(1)(ii)(J) OF THE ACT.

ITEM 9.   NOTICE OF DISSOLUTION OF A GROUP

          NOT APPLICABLE

ITEM 10.  CERTIFICATION

          NOT APPLICABLE

EXHIBITS: A: JOINT FILING STATEMENT



<PAGE>   12





                                    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:  March 7, 2000

<TABLE>

<S>                                                             <C>
ENTERPRISE PARTNERS IV, L.P.                                    ENTERPRISE PARTNERS IV ASSOCIATES, L.P.

By:  Enterprise Management Partners IV, L.P.,                   By:  Enterprise Management Partners IV, L.P.,
         its general partner                                             its general partner



BY:      /s/ Andrew E. Senyei                                   BY:      /s/ Andrew E. Senyei
   -----------------------------------------                       --------------------------
         Andrew E. Senyei                                                Andrew E. Senyei
         General Partner                                                 General Partner

ENTERPRISE MANAGEMENT
PARTNERS IV, L.P.




BY:      /s/ Andrew E. Senyei
   -----------------------------------------
         Andrew E. Senyei
         General Partner

INDIVIDUALS:

/s/ Andrew E. Senyei                                            /s/ William R. Stensrud
- --------------------------------------------                    ------------------------
Andrew E. Senyei                                                William R. Stensrud

/s/ James H. Berglund                                           /s/ Ronald Taylor
- --------------------------------------------                    ------------------------
James H. Berglund                                               Ronald Taylor
</TABLE>


         The original statement shall be signed by each person on whose behalf
the statement is filed or his authorized representative. If the statement is
signed on behalf of a person by his authorized representative other than an
executive officer or general partner of the filing person, evidence of the
representative's authority to sign on behalf of such person shall be filed with
the statement, provided, however, that a power of attorney for this purpose
which is already on file with the Commission may be incorporated by reference.
The name and any title of each person who signs the statement shall be typed or
printed beneath his signature.

Note: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including exhibits. See Section 240.13d-7 for other
parties for whom copies are to be sent.

ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT CONSTITUTE FEDERAL
CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001)


<PAGE>   13


                                    EXHIBIT A

                             JOINT FILING STATEMENT

         Pursuant to Rule 13d-1(k)(1), we, the undersigned, hereby express our
agreement that the attached Schedule 13G is filed on behalf of each of us.

         Date:  March  7, 2000

<TABLE>

<S>                                                           <C>
ENTERPRISE PARTNERS IV, L.P.                                    ENTERPRISE PARTNERS IV ASSOCIATES, L.P.

By:  Enterprise Management Partners IV, L.P.,                   By:  Enterprise Management Partners IV, L.P.,
         its general partner                                             its general partner



BY:      /s/ Andrew E. Senyei                                   BY:      /s/ Andrew E. Senyei
   -----------------------------------------                       --------------------------
         Andrew E. Senyei                                                Andrew E. Senyei
         General Partner                                                 General Partner

ENTERPRISE MANAGEMENT PARTNERS IV, L.P.




BY:      /s/ Andrew E. Senyei
   -----------------------------------------
         Andrew E. Senyei
         General Partner

INDIVIDUALS:

/s/ Andrew E. Senyei                                            /s/ Ronald Taylor
- --------------------------------------------                    -----------------------
Andrew E. Senyei                                                Ronald Taylor

/s/ James H. Berglund                                           /s/ William S. Stensrud
- --------------------------------------------                    ------------------------
James H. Berglund                                               William S. Stensrud
</TABLE>


<PAGE>   14



                          INSTRUCTIONS FOR SCHEDULE 13G

INSTRUCTIONS FOR COVER PAGE

(1)   Names And I.R.S. Numbers of Reporting Persons - Furnish the full legal
      name of each person for whom the report is filed -- i.e., each person
      required to sign the schedule itself -- including each member of a group.
      Do not include the name of a person required to be identified in the
      report but who is not a reporting person. Reporting persons that are
      entities are also requested to furnish their I.R.S. identification
      numbers, although disclosure of such numbers is voluntary, not mandatory
      (see "SPECIAL INSTRUCTIONS FOR COMPLYING WITH SCHEDULE 13G", below).

(2)   If any of the shares beneficially owned by a reporting person are held as
      a member of a group and such membership is expressly affirmed, please
      check row 2(a). If the reporting person disclaims membership in a group or
      describes a relationship with other persons but does not affirm the
      existence of a group, please check row 2(b) [unless a joint filing
      pursuant to Rule 13d-1(k)(1) in which case it may not be necessary to
      check row 2(b)].

(3)   The third row is for SEC internal use; please leave blank.

(4)   Citizenship or Place of Organization - Furnish citizenship if the named
      reporting person is a natural person. Otherwise, furnish place of
      organization.

(5) - (9),(11) Aggregate Amount Beneficially Owned By Each Reporting Person,
      Etc. - Rows (5) through (9) inclusive, and (11) are to be completed in
      accordance with the provisions of Item 4 of Schedule 13G. All percentages
      are to be rounded off to the nearest tenth (one place after decimal
      point).

(10)  Check if the aggregate amount reported as beneficially owned in row (9)
      does not include shares as to which beneficial ownership is disclaimed
      pursuant to Rule 13d-4 [17 CFR 240.13d-4] under the Securities Exchange
      Act of 1934.

(12)  Type of Reporting Person - Please classify each "reporting person"
      according to the following breakdown (see Item 3 of Schedule 13G) and
      place the appropriate symbol on the form:

<TABLE>
<CAPTION>
CATEGORY                                                                       SYMBOL
<S>                                                                           <C>
Broker Dealer.............................................................       BD
Bank......................................................................       BK
Insurance Company.........................................................       IC
Investment Company........................................................       IV
Investment Adviser........................................................       IA
Employee Benefit Plan, Pension Fund, or Endowment Fund....................       EP
Parent Holding Company/Control Person.....................................       HC
Savings Association.......................................................       SA
Church Plan...............................................................       CP
Corporation...............................................................       CO
Partnership...............................................................       PN
Individual................................................................       IN
Other.....................................................................       OO
</TABLE>

Notes:
         Attach as many copies of the second part of the cover page as
are needed, one reporting person per page.

         Filing persons may, in order to avoid unnecessary duplication,
answer items on the schedules (Schedule 13D, 13G or 14D-1) by
appropriate cross references to an item or items on the cover page(s).
This approach may only be used where the cover page item or items
provide all the disclosure required by the schedule item. Moreover,
such a use of a cover page item will result in the item becoming a part
of the schedule and accordingly being considered as "filed" for
purposes of Section 18 of the Securities Exchange Act or otherwise
subject to the liabilities of that section of the Act.


<PAGE>   15


         Reporting persons may comply with their cover page filing
requirements by filing either completed copies of the blank forms
available from the Commission, printed or typed facsimiles, or computer
printed facsimiles, provided the documents filed have identical formats
to the forms prescribed in the Commission's regulations and meet
existing Securities Exchange Act rules as to such matters as clarity
and size (Securities Exchange Act Rule 12b-12).


              SPECIAL INSTRUCTIONS FOR COMPLYING WITH SCHEDULE 13G


         Under Sections 13(d), 13(g) and 23 of the Securities Exchange Act of
1934 and the rules and regulations thereunder, the Commission is authorized to
solicit the information required to be supplied by this schedule by certain
security holders of certain issuers.
         Disclosure of the information specified in this schedule is mandatory,
except for I.R.S. identification numbers, disclosure of which is voluntary. The
information will be used for the primary purpose of determining and disclosing
the holdings of certain beneficial owners of certain equity securities. This
statement will be made a matter of public record. Therefore, any information
given will be available for inspection by any member of the public.
         Because of the public nature of the information, the Commission can use
it for a variety of purposes, including referral to other governmental
authorities or securities self-regulatory organizations for investigatory
purposes or in connection with litigation involving the Federal securities laws
or other civil, criminal or regulatory statutes or provisions. I.R.S.
identification numbers, if furnished, will assist the Commission in identifying
securityholders and, therefore, in promptly processing statements of beneficial
ownership of securities.
         Failure to disclose the information requested by this schedule, except
for I.R.S. identification numbers, may result in civil or criminal action
against the persons involved for violation of the Federal securities laws and
rules promulgated thereunder.


                              GENERAL INSTRUCTIONS

A.       Statements filed pursuant to Rule 13d-1(b) containing the information
         required by this schedule shall be filed not later than February 14
         following the calendar year covered by the statement or within the time
         specified in Rules 13d-1(b)(2) and 13d-2(c). Statements filed pursuant
         to Rule 13d-1(c) shall be filed within the time specified in Rules
         13d-1(c), 13d-2(b) and 13d-2(d). Statements filed pursuant to Rule
         13d-1(d) shall be filed not later than February 14 following the
         calendar year covered by the statement pursuant to Rules 13d-1(d) and
         13d-2(b).

B.       Information contained in a form which is required to be filed by rules
         under section 13(f) (15 U.S.C. 78m(f)) for the same calendar year as
         that covered by a statement on this schedule may be incorporated by
         reference in response to any of the items of this schedule. If such
         information is incorporated by reference in this schedule, copies of
         the relevant pages of such form shall be filed as an exhibit to this
         schedule.

C.       The item numbers and captions of the items shall be included but the
         text of the items is to be omitted. The answers to the items shall be
         so prepared as to indicate clearly the coverage of the items without
         referring to the text of the items. Answer every item. If an item is
         inapplicable or the answer is in the negative, so state.


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