UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

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

                                  SCHEDULE 13D
                                 (Rule 13d-101)

             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
            TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO
                                  RULE 13d-2(a)

                               (Amendment No. 1)*

                       Cogent Communications Group, Inc.
--------------------------------------------------------------------------------
                                (Name of Issuer)

                    Common Stock, $0.001 par value per share
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   19239V104
--------------------------------------------------------------------------------
                                 (CUSIP Number)

                                    James Wei
                          Worldview Technology Partners
                             435 Tasso Street, #120
                               Palo Alto, CA 94301
                                 (650) 322-3800
--------------------------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                   Copies to:
                               Sean Caplice, Esq.
          Gunderson Dettmer Stough Villeneuve Franklin & Hachigian, LLP
                              155 Constitution Dr.
                              Menlo Park, CA 94025
                                 (650) 321-2400

                                 March 30, 2004
--------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of This Statement)

         If the filing person has  previously  filed a statement on Schedule 13G
to report the  acquisition  that is the  subject of this  Schedule  13D,  and is
filing this schedule because of Rule 13d-1(e),  13d-1(f) or 13d-1(g),  check the
following box [ ].

         Note:  Schedules  filed in paper format shall include a signed original
and five copies of the  schedule,  including  all  exhibits.  See Rule 13d-7 for
other parties to whom copies are to be sent.

         * 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 disclosures provided in the cover page.

         The information  required on the remainder of this cover page shall not
be deemed  to be  "filed"  for the  purposes  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).

                         (Continued on following pages)

                              (Page 1 of 26 Pages)



CUSIP No. 19239V104               SCHEDULE 13D                Page 2 of 26 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Worldview Technology Partners IV, L.P. ("WVTP IV")
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


--------------------------------------------------------------------------------
4     SOURCE OF FUNDS*

      WC
--------------------------------------------------------------------------------
5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEM 2(d) or 2(e)                                                   |_|

--------------------------------------------------------------------------------
6     CITIZENSHIP OR PLACE OF ORGANIZATION

      Delaware
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        16,703,312 shares, except that Worldview Capital IV,
                        L.P. ("WVC IV"), the general partner of Worldview
                        Technology Partners IV, L.P. ("WVTP IV"), Worldview
                        Equity I, L.L.C. ("WVE I"), the general partner of WVC
                        IV, and James Wei ("Wei"), Michael Orsak ("Orsak") and
                        Susumu Tanaka ("Tanaka"), the members of WVE I, may be
                        deemed to have shared power to vote these shares.
                        --------------------------------------------------------
  NUMBER OF       8     SHARED VOTING POWER
   SHARES
BENEFICIALLY            See response to row 7.
  OWNED BY              --------------------------------------------------------
    EACH          9     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               16,703,312 shares, except that WVC IV, the general
    WITH                partner of WVTP IV, WVE I, the general partner of WVC
                        IV, and Wei, Orsak and Tanaka, the members of WVE I, may
                        be deemed to have shared power to dispose of these
                        shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

                        See response to row 9.
--------------------------------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      16,703,312
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|

--------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      3.2%*
--------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      PN
--------------------------------------------------------------------------------
* Please see Item 5 with respect to the determination of the number of shares of
Common Stock deemed to be outstanding



CUSIP No. 19239V104               SCHEDULE 13D                Page 3 of 26 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Worldview Technology International IV, L.P. ("WVTI IV")
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


--------------------------------------------------------------------------------
4     SOURCE OF FUNDS*

      WC
--------------------------------------------------------------------------------
5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEM 2(d) or 2(e)                                                   |_|

--------------------------------------------------------------------------------
6     CITIZENSHIP OR PLACE OF ORGANIZATION

      Delaware
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        2,719,878 shares, except that WVC IV, the general
                        partner of WVTI IV, WVE I, the general partner of WVC
                        IV, and Wei, Orsak and Tanaka, the members of WVE I, may
                        be deemed to have shared power to vote these shares.
                        --------------------------------------------------------
  NUMBER OF       8     SHARED VOTING POWER
   SHARES
BENEFICIALLY            See response to row 7.
  OWNED BY              --------------------------------------------------------
    EACH          9     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               2,719,878 shares, except that WVC IV, the general
    WITH                partner of WVTI IV, WVE I, the general partner of WVC
                        IV, and Wei, Orsak and Tanaka, the members of WVE I, may
                        be deemed to have shared power to dispose of these
                        shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

                        See response to row 9.
--------------------------------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      2,719,878
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|

--------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      0.5%*
--------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      PN
--------------------------------------------------------------------------------
* Please see Item 5 with respect to the determination of the number of shares of
Common Stock deemed to be outstanding



CUSIP No. 19239V104               SCHEDULE 13D                Page 4 of 26 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Worldview Strategic Partners IV, L.P. ("WVSP IV")
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


--------------------------------------------------------------------------------
4     SOURCE OF FUNDS*

      WC
--------------------------------------------------------------------------------
5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEM 2(d) or 2(e)                                                   |_|

--------------------------------------------------------------------------------
6     CITIZENSHIP OR PLACE OF ORGANIZATION

      Delaware
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        130,176 shares, except that WVC IV, the general partner
                        of WVSP IV, WVE I, the general partner of WVC IV, and
                        Wei, Orsak and Tanaka, the members of WVE I, may be
                        deemed to have shared voting power to vote these shares.
                        --------------------------------------------------------
  NUMBER OF       8     SHARED VOTING POWER
   SHARES
BENEFICIALLY            See response to row 7.
  OWNED BY              --------------------------------------------------------
    EACH          9     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               130,176 shares, except that WVC IV, the general partner
    WITH                of WVSP IV, WVE I, the general partner of WVC IV, and
                        Wei, Orsak and Tanaka, the members of WVE I, may be
                        deemed to have shared power to dispose of these shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

                        See response to row 9.
--------------------------------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      130,176
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|

--------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      0.0%*
--------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      PN
--------------------------------------------------------------------------------
* Please see Item 5 with respect to the determination of the number of shares of
Common Stock deemed to be outstanding



CUSIP No. 19239V104               SCHEDULE 13D                Page 5 of 26 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Worldview Capital IV, L.P.("WVC IV")
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


--------------------------------------------------------------------------------
4     SOURCE OF FUNDS*

      WC
--------------------------------------------------------------------------------
5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEM 2(d) or 2(e)                                                   |_|

--------------------------------------------------------------------------------
6     CITIZENSHIP OR PLACE OF ORGANIZATION

      Delaware
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        19,553,366 shares, of which 16,703,312 are directly
                        owned by WVTP IV; 2,719,878 are directly owned by WVTI
                        IV; and 130,176 are directly owned by WVSP IV. WVC IV,
                        the general partner of WVTP IV, WVTI IV and WVSP IV, WVE
                        I, the general partner of WVC IV, and Wei, Orsak and
                        Tanaka, the members of WVE I, may be deemed to have
                        shared power to vote these shares.
                        --------------------------------------------------------
  NUMBER OF       8     SHARED VOTING POWER
   SHARES
BENEFICIALLY            See response to row 7.
  OWNED BY              --------------------------------------------------------
    EACH          9     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               19,553,366 shares, of which 16,703,312 are directly
    WITH                owned by WVTP IV; 2,719,878 are directly owned by WVTI
                        IV; and 130,176 are directly owned by WVSP IV. WVC IV,
                        the general partner of WVTP IV, WVTI IV and WVSP IV, WVE
                        I, the general partner of WVC IV, and Wei, Orsak and
                        Tanaka, the members of WVE I, may be deemed to have
                        shared power to dispose of these shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

                        See response to row 9.
--------------------------------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      19,553,366
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|

--------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      3.8%*
--------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      PN
--------------------------------------------------------------------------------
* Please see Item 5 with respect to the determination of the number of shares of
Common Stock deemed to be outstanding



CUSIP No. 19239V104               SCHEDULE 13D                Page 6 of 26 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Worldview Technology Partners III, L.P. ("WVTP III")
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


--------------------------------------------------------------------------------
4     SOURCE OF FUNDS*

      WC
--------------------------------------------------------------------------------
5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEM 2(d) or 2(e)                                                   |_|

--------------------------------------------------------------------------------
6     CITIZENSHIP OR PLACE OF ORGANIZATION

      Delaware
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        35,173,362 shares, except that Worldview Capital III,
                        L.P. ("WVC III"), the general partner of WVTP III, WVE
                        I, the general partner of WVC III, and Wei, Orsak and
                        Tanaka, the members of WVE I, may be deemed to have
                        shared power to vote these shares.
                        --------------------------------------------------------
  NUMBER OF       8     SHARED VOTING POWER
   SHARES
BENEFICIALLY            See response to row 7.
  OWNED BY              --------------------------------------------------------
    EACH          9     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               35,173,362 shares, except that WVC III, the general
    WITH                partner of WVTP III, WVE I, the general partner of WVC
                        III, and Wei, Orsak and Tanaka, the members of WVE I,
                        may be deemed to have shared power to dispose of these
                        shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

                        See response to row 9.
--------------------------------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      35,173,362
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|

--------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      6.8%*
--------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      PN
--------------------------------------------------------------------------------
* Please see Item 5 with respect to the determination of the number of shares of
Common Stock deemed to be outstanding



CUSIP No. 19239V104               SCHEDULE 13D                Page 7 of 26 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Worldview Technology International III, L.P. ("WVTI III")
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


--------------------------------------------------------------------------------
4     SOURCE OF FUNDS*

      WC
--------------------------------------------------------------------------------
5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEM 2(d) or 2(e)                                                   |_|

--------------------------------------------------------------------------------
6     CITIZENSHIP OR PLACE OF ORGANIZATION

      Delaware
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        8,669,304 shares, except that WVC III, the general
                        partner of WVTI III, WVE I, the general partner of WVC
                        III, and Wei, Orsak and Tanaka, the members of WVE I,
                        may be deemed to have shared power to vote these shares.
                        --------------------------------------------------------
  NUMBER OF       8     SHARED VOTING POWER
   SHARES
BENEFICIALLY            See response to row 7.
  OWNED BY              --------------------------------------------------------
    EACH          9     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               8,669,304 shares, except that WVC III, the general
    WITH                partner of WVTI III, WVE I, the general partner of WVC
                        III, and Wei, Orsak and Tanaka, the members of WVE I,
                        may be deemed to have shared power to dispose of these
                        shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

                        See response to row 9.
--------------------------------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      8,669,304
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|

--------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      1.7%*
--------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      PN
--------------------------------------------------------------------------------
* Please see Item 5 with respect to the determination of the number of shares of
Common Stock deemed to be outstanding



CUSIP No. 19239V104               SCHEDULE 13D                Page 8 of 26 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Worldview Strategic Partners III, L.P. ("WVSP III")
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


--------------------------------------------------------------------------------
4     SOURCE OF FUNDS*

      WC
--------------------------------------------------------------------------------
5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEM 2(d) or 2(e)                                                   |_|

--------------------------------------------------------------------------------
6     CITIZENSHIP OR PLACE OF ORGANIZATION

      Delaware
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        777,324 shares, except that WVC III, the general partner
                        of WVSP III, WVE I, the general partner of WVC III, and
                        Wei, Orsak and Tanaka, the members of WVE I, may be
                        deemed to have shared voting power to vote these shares.
                        --------------------------------------------------------
  NUMBER OF       8     SHARED VOTING POWER
   SHARES
BENEFICIALLY            See response to row 7.
  OWNED BY              --------------------------------------------------------
    EACH          9     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               777,324 shares, except that WVC III, the general partner
    WITH                of WVSP III, WVE I, the general partner of WVC III, and
                        Wei, Orsak and Tanaka, the members of WVE I, may be
                        deemed to have shared power to dispose of these shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

                        See response to row 9.
--------------------------------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      777,324
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|

--------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      0.2%*
--------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      PN
--------------------------------------------------------------------------------
* Please see Item 5 with respect to the determination of the number of shares of
Common Stock deemed to be outstanding



CUSIP No. 19239V104               SCHEDULE 13D                Page 9 of 26 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Worldview III Carrier Fund, L.P. ("WVCF III")
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


--------------------------------------------------------------------------------
4     SOURCE OF FUNDS*

      WC
--------------------------------------------------------------------------------
5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEM 2(d) or 2(e)                                                   |_|

--------------------------------------------------------------------------------
6     CITIZENSHIP OR PLACE OF ORGANIZATION

      Delaware
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        1,932,131 shares, except that WVC III, the general
                        partner of WVCF III, WVE I, the general partner of WVC
                        III, and Wei, Orsak and Tanaka, the members of WVE I,
                        may be deemed to have shared voting power to vote these
                        shares.
                        --------------------------------------------------------
  NUMBER OF       8     SHARED VOTING POWER
   SHARES
BENEFICIALLY            See response to row 7.
  OWNED BY              --------------------------------------------------------
    EACH          9     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               1,932,131 shares, except that WVC III, the general
    WITH                partner of WVCF III, WVE I, the general partner of WVC
                        III, and Wei, Orsak and Tanaka, the members of WVE I,
                        may be deemed to have shared power to dispose of these
                        shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

                        See response to row 9.
--------------------------------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      1,932,131
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|

--------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      0.4%*
--------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      PN
--------------------------------------------------------------------------------
* Please see Item 5 with respect to the determination of the number of shares of
Common Stock deemed to be outstanding



CUSIP No. 19239V104               SCHEDULE 13D               Page 10 of 26 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Worldview Capital III, L.P. ("WVC III")
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


--------------------------------------------------------------------------------
4     SOURCE OF FUNDS*

      WC
--------------------------------------------------------------------------------
5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEM 2(d) or 2(e)                                                   |_|

--------------------------------------------------------------------------------
6     CITIZENSHIP OR PLACE OF ORGANIZATION

      Delaware
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        46,552,121 shares, of which 35,173,362 are directly
                        owned by WVTP III; 8,669,304 are directly owned by WVTI
                        III; 777,324 are directly owned by WVSP III; and
                        1,932,131 are directly owned by WVCF III. WVC III, the
                        general partner of WVTP III, WVTI III, WVSP II, and WVCF
                        III, WVE I, the general partner of WVC III, and Wei,
                        Orsak and Tanaka, the members of WVE I, may be deemed to
                        have shared power to vote these shares.
                        --------------------------------------------------------
  NUMBER OF       8     SHARED VOTING POWER
   SHARES
BENEFICIALLY            See response to row 7.
  OWNED BY              --------------------------------------------------------
    EACH          9     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               46,552,121 shares, of which 35,173,362 are directly
    WITH                owned by WVTP III; 8,669,304 are directly owned by WVTI
                        III; 777,324 are directly owned by WVSP III; and
                        1,932,131 are directly owned by WVCF III. WVC III, the
                        general partner of WVTP III, WVTI III, WVSP II, and WVCF
                        III, WVE I, the general partner of WVC III, and Wei,
                        Orsak and Tanaka, the members of WVE I, may be deemed to
                        have shared power to dispose of these shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

                        See response to row 9.
--------------------------------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      46,552,121
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|

--------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      9.0%*
--------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      PN
--------------------------------------------------------------------------------
* Please see Item 5 with respect to the determination of the number of shares of
Common Stock deemed to be outstanding



CUSIP No. 19239V104               SCHEDULE 13D               Page 11 of 26 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Worldview Equity I, L.L.C. ("WVE I")
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


--------------------------------------------------------------------------------
4     SOURCE OF FUNDS*

      WC
--------------------------------------------------------------------------------
5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEM 2(d) or 2(e)                                                   |_|

--------------------------------------------------------------------------------
6     CITIZENSHIP OR PLACE OF ORGANIZATION

      Delaware
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        66,105,487 shares, of which 16,703,312 are directly
                        owned by WVTP IV; 2,719,878 are directly owned by WVTI
                        IV; 130,176 are directly owned by WVSP IV; 35,173,362
                        are directly owned by WVTP III; 8,669,304 are directly
                        owned by WVTI III; 777,324 are directly owned by WVSP
                        III; and 1,932,131 are directly owned by WVCF III. WVE
                        I, the general partner of WVC IV and WVC III, the
                        respective general partners of WVTP IV, WVTI IV and WVSP
                        IV, and WVTP III, WVTI III, WVSP III and WVCF III, and
                        Wei, Orsak and Tanaka, the members of WVE I, may be
                        deemed to have shared power to vote these shares.
                        --------------------------------------------------------
  NUMBER OF       8     SHARED VOTING POWER
   SHARES
BENEFICIALLY            See response to row 7.
  OWNED BY              --------------------------------------------------------
    EACH          9     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               66,105,487 shares, of which 16,703,312 are directly
    WITH                owned by WVTP IV; 2,719,878 are directly owned by WVTI
                        IV; 130,176 are directly owned by WVSP IV; 35,173,362
                        are directly owned by WVTP III; 8,669,304 are directly
                        owned by WVTI III; 777,324 are directly owned by WVSP
                        III; and 1,932,131 are directly owned by WVCF III. WVE
                        I, the general partner of WVC IV and WVC III, the
                        respective general partners of WVTP IV, WVTI IV and WVSP
                        IV, and WVTP III, WVTI III, WVSP III and WVCF III, and
                        Wei, Orsak and Tanaka, the members of WVE I, may be
                        deemed to have shared power to dispose of these shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

                        See response to row 9.
--------------------------------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      66,105,487
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|

--------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      12.8%*
--------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      OO
--------------------------------------------------------------------------------
* Please see Item 5 with respect to the determination of the number of shares of
Common Stock deemed to be outstanding



CUSIP No. 19239V104               SCHEDULE 13D               Page 12 of 26 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      James Wei ("Wei")
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


--------------------------------------------------------------------------------
4     SOURCE OF FUNDS*

      WC
--------------------------------------------------------------------------------
5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEM 2(d) or 2(e)                                                   |_|

--------------------------------------------------------------------------------
6     CITIZENSHIP OR PLACE OF ORGANIZATION

      Canadian Citizen
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        None.
                        --------------------------------------------------------
  NUMBER OF       8     SHARED VOTING POWER
   SHARES
BENEFICIALLY            66,105,487 shares, of which 16,703,312 are directly
  OWNED BY              owned by WVTP IV; 2,719,878 are directly owned by WVTI
    EACH                IV; 130,176 are directly owned by WVSP IV; 35,173,362
  REPORTING             are directly owned by WVTP III; 8,669,304 are directly
   PERSON               owned by WVTI III; 777,324 are directly owned by WVSP
    WITH                III; and 1,932,131 are directly owned by WVCF III. WVC
                        IV is the general partner of WVTP IV, WVTI IV and WVSP
                        IV; WVC III is the general partner of WVTP III, WVTI
                        III, WVSP III and WVCF II; WVE I is the general partner
                        of WVC IV and WVC III; and Wei, a member of WVE I may be
                        deemed to have shared power to vote these shares.
                        --------------------------------------------------------
                  9     SOLE DISPOSITIVE POWER

                        None.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

                        66,105,487 shares, of which 16,703,312 are directly
                        owned by WVTP IV; 2,719,878 are directly owned by WVTI
                        IV; 130,176 are directly owned by WVSP IV; 35,173,362
                        are directly owned by WVTP III; 8,669,304 are directly
                        owned by WVTI III; 777,324 are directly owned by WVSP
                        III; and 1,932,131 are directly owned by WVCF III. WVC
                        IV is the general partner of WVTP IV, WVTI IV and WVSP
                        IV; WVC III is the general partner of WVTP III, WVTI
                        III, WVSP III and WVCF II; WVE I is the general partner
                        of WVC IV and WVC III; and Wei, a member of WVE I may be
                        deemed to have shared power to dispose of these shares.
--------------------------------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      66,105,487
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|

--------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      12.8%*
--------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      IN
--------------------------------------------------------------------------------
* Please see Item 5 with respect to the determination of the number of shares of
Common Stock deemed to be outstanding



CUSIP No. 19239V104               SCHEDULE 13D               Page 13 of 26 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Michael Orsak ("Orsak")
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


--------------------------------------------------------------------------------
4     SOURCE OF FUNDS*

      WC
--------------------------------------------------------------------------------
5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEM 2(d) or 2(e)                                                   |_|

--------------------------------------------------------------------------------
6     CITIZENSHIP OR PLACE OF ORGANIZATION

      U.S. Citizen
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        None.
                        --------------------------------------------------------
  NUMBER OF       8     SHARED VOTING POWER
   SHARES
BENEFICIALLY            66,105,487 shares, of which 16,703,312 are directly
  OWNED BY              owned by WVTP IV; 2,719,878 are directly owned by WVTI
    EACH                IV; 130,176 are directly owned by WVSP IV; 35,173,362
  REPORTING             are directly owned by WVTP III; 8,669,304 are directly
   PERSON               owned by WVTI III; 777,324 are directly owned by WVSP
    WITH                III; and 1,932,131 are directly owned by WVCF III. WVC
                        IV is the general partner of WVTP IV, WVTI IV and WVSP
                        IV; WVC III is the general partner of WVTP III, WVTI
                        III, WVSP III and WVCF II; WVE I is the general partner
                        of WVC IV and WVC III; and Orsak, a member of WVE I may
                        be deemed to have shared power to vote these shares.
                        --------------------------------------------------------
                  9     SOLE DISPOSITIVE POWER

                        None.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

                        66,105,487 shares, of which 16,703,312 are directly
                        owned by WVTP IV; 2,719,878 are directly owned by WVTI
                        IV; 130,176 are directly owned by WVSP IV; 35,173,362
                        are directly owned by WVTP III; 8,669,304 are directly
                        owned by WVTI III; 777,324 are directly owned by WVSP
                        III; and 1,932,131 are directly owned by WVCF III. WVC
                        IV is the general partner of WVTP IV, WVTI IV and WVSP
                        IV; WVC III is the general partner of WVTP III, WVTI
                        III, WVSP III and WVCF II; WVE I is the general partner
                        of WVC IV and WVC III; and Orsak, a member of WVE I may
                        be deemed to have shared power to dispose of these
                        shares.
--------------------------------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      66,105,487
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|

--------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      12.8%*
--------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      IN
--------------------------------------------------------------------------------
* Please see Item 5 with respect to the determination of the number of shares of
Common Stock deemed to be outstanding



CUSIP No. 19239V104               SCHEDULE 13D               Page 14 of 26 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Susumu Tanaka ("Tanaka")
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


--------------------------------------------------------------------------------
4     SOURCE OF FUNDS*

      WC
--------------------------------------------------------------------------------
5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEM 2(d) or 2(e)                                                   |_|

--------------------------------------------------------------------------------
6     CITIZENSHIP OR PLACE OF ORGANIZATION

      Japanese Citizen
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        None.
                        --------------------------------------------------------
  NUMBER OF       8     SHARED VOTING POWER
   SHARES
BENEFICIALLY            66,105,487 shares, of which 16,703,312 are directly
  OWNED BY              owned by WVTP IV; 2,719,878 are directly owned by WVTI
    EACH                IV; 130,176 are directly owned by WVSP IV; 35,173,362
  REPORTING             are directly owned by WVTP III; 8,669,304 are directly
   PERSON               owned by WVTI III; 777,324 are directly owned by WVSP
    WITH                III; and 1,932,131 are directly owned by WVCF III. WVC
                        IV is the general partner of WVTP IV, WVTI IV and WVSP
                        IV; WVC III is the general partner of WVTP III, WVTI
                        III, WVSP III and WVCF II; WVE I is the general partner
                        of WVC IV and WVC III; and Tanaka, a member of WVE I may
                        be deemed to have shared power to vote these shares.
                        --------------------------------------------------------
                  9     SOLE DISPOSITIVE POWER

                        None.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

                        66,105,487 shares, of which 16,703,312 are directly
                        owned by WVTP IV; 2,719,878 are directly owned by WVTI
                        IV; 130,176 are directly owned by WVSP IV; 35,173,362
                        are directly owned by WVTP III; 8,669,304 are directly
                        owned by WVTI III; 777,324 are directly owned by WVSP
                        III; and 1,932,131 are directly owned by WVCF III. WVC
                        IV is the general partner of WVTP IV, WVTI IV and WVSP
                        IV; WVC III is the general partner of WVTP III, WVTI
                        III, WVSP III and WVCF II; WVE I is the general partner
                        of WVC IV and WVC III; and Tanaka, a member of WVE I may
                        be deemed to have shared power to dispose of these
                        shares.
--------------------------------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      66,105,487
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|

--------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      12.8%*
--------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      IN
--------------------------------------------------------------------------------
* Please see Item 5 with respect to the determination of the number of shares of
Common Stock deemed to be outstanding



CUSIP No. 19239V104               SCHEDULE 13D               Page 15 of 26 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Tim Weingarten ("Weingarten")
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


--------------------------------------------------------------------------------
4     SOURCE OF FUNDS*

      WC
--------------------------------------------------------------------------------
5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEM 2(d) or 2(e)                                                   |_|

--------------------------------------------------------------------------------
6     CITIZENSHIP OR PLACE OF ORGANIZATION

      U.S. Citizen
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        None.
                        --------------------------------------------------------
  NUMBER OF       8     SHARED VOTING POWER
   SHARES
BENEFICIALLY            66,105,487 shares, of which 16,703,312 are directly
  OWNED BY              owned by WVTP IV; 2,719,878 are directly owned by WVTI
    EACH                IV; 130,176 are directly owned by WVSP IV; 35,173,362
  REPORTING             are directly owned by WVTP III; 8,669,304 are directly
   PERSON               owned by WVTI III; 777,324 are directly owned by WVSP
    WITH                III; and 1,932,131 are directly owned by WVCF III. WVC
                        IV is the general partner of WVTP IV, WVTI IV and WVSP
                        IV; WVC III is the general partner of WVTP III, WVTI
                        III, WVSP III and WVCF II; WVE I is the general partner
                        of WVC IV and WVC III; and Weingarten has certain voting
                        rights in WVE I and may be deemed to have shared power
                        to vote these shares.
                        --------------------------------------------------------
                  9     SOLE DISPOSITIVE POWER

                        None.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

                        66,105,487 shares, of which 16,703,312 are directly
                        owned by WVTP IV; 2,719,878 are directly owned by WVTI
                        IV; 130,176 are directly owned by WVSP IV; 35,173,362
                        are directly owned by WVTP III; 8,669,304 are directly
                        owned by WVTI III; 777,324 are directly owned by WVSP
                        III; and 1,932,131 are directly owned by WVCF III. WVC
                        IV is the general partner of WVTP IV, WVTI IV and WVSP
                        IV; WVC III is the general partner of WVTP III, WVTI
                        III, WVSP III and WVCF II; WVE I is the general partner
                        of WVC IV and WVC III; and Weingarten has certain voting
                        rights in WVE I and may be deemed to have shared power
                        to dispose of these shares.
--------------------------------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      66,105,487
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|

--------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      12.8%*
--------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      IN
--------------------------------------------------------------------------------
* Please see Item 5 with respect to the determination of the number of shares of
Common Stock deemed to be outstanding



                                                             Page 16 of 26 Pages

                            Statement on Schedule 13D

         This  Amendment  No. 1 to  Schedule  13D is being  filed to report  the
acquisition of 150 shares of Series J Preferred Stock, which is convertible into
common  stock,  par value  $0.001  per share  (the  "Common  Stock"),  of Cogent
Communications  Group,  Inc.,  a  Delaware  corporation  (the  "Company").  This
Amendment No. 1 supplements  and amends the Schedule 13D  originally  filed with
the  Securities  and  Exchange  Commission  on August  11,  2003 (the  "Original
Filing"). Only those items that are hereby reported are amended; all other items
remain unchanged. All capitalized terms shall have the meanings assigned to them
in the Original Filing, unless otherwise indicated herein.


ITEM 2.  IDENTITY AND BACKGROUND.

         (a) This statement is filed by Worldview  Technology Partners IV, L.P.,
a Delaware limited partnership ("WVTP IV"), Worldview  Technology  International
IV, L.P.,  a Delaware  limited  partnership  ("WVTI  IV"),  Worldview  Strategic
Partners IV, L.P., a Delaware limited partnership ("WVSP IV"), Worldview Capital
IV, L.P., a Delaware limited partnership ("WVC IV"), Worldview Equity I, L.L.C.,
a Delaware limited liability company ("WVE I"),  Worldview  Technology  Partners
III, L.P., a Delaware limited  partnership  ("WVTP III"),  Worldview  Technology
International III, L.P., a Delaware limited partnership ("WVTI III"),  Worldview
Strategic  Partners  III,  L.P., a Delaware  limited  partnership  ("WVSP III"),
Worldview III Carrier Fund, L.P., a Delaware limited  partnership  ("WVCF III"),
Worldview  Capital III, L.P., a Delaware limited  partnership  ("WVC II"), James
Wei ("Wei"),  Michael Orsak ("Orsak") and Susumu Tanaka ("Tanaka,"  collectively
with Wei and Orsak, the "Partners") and Tim Weingarten ("Weingarten").

         WVC IV is the general partner of WVTP IV, WVTI IV and WVSP IV. WVE I is
the  general  partner of WVC IV.  WVC IV and WVE I may be deemed to have  shared
power to vote and shared power to dispose of shares of the issuer directly owned
by WVTP IV, WVTI IV and WVSP IV. Wei, Orsak and Tanaka are the managing  members
of WVE I, and may be deemed to have  shared  power to vote and  shared  power to
dispose of the shares of issuer  directly owned by WVTP IV, WVTI IV and WVSP IV.
Weingarten  has certain voting rights in WVE I, and may be deemed to have shared
power to vote and shared power to dispose of the shares of issuer directly owned
by WVTP IV, WVTI IV and WVSP IV.

         WVC III is the general partner of WVTP III, WVTI III, WVSP III and WVCF
III. WVE I is the general partner of WVC III. WVC III and WVE I may be deemed to
have  shared  power to vote and shared  power to dispose of shares of the issuer
directly  owned by WVTP III,  WVTI III,  WVSP III and WVCF III.  Wei,  Orsak and
Tanaka are the managing members of WVE I, and may be deemed to have shared power
to vote and shared  power to dispose of the shares of issuer  directly  owned by
WVTP III, WVTI III, WVSP III and WVCF III.

         WVC IV, WVTP IV, WVTI IV, WVSP IV, WVC III,  WVTP III,  WVTI III,  WVSP
III,  WVCF  III  and  WVE I are  collectively  referred  to  as  the  "Worldview
Entities." The Worldview Entities,  the Partners and Weingarten are collectively
referred to as the "Reporting Persons" in this statement.

         By making this filing, the Reporting Persons  acknowledge that they may
be deemed to constitute a "group" within the meaning of Section  13(d)(3) of the
Securities  Exchange Act of 1934, as amended (the "Exchange Act"), in connection
with  the  securities  of the  Company.  Each  Reporting  Person  disclaims  the
existence  of a "group"  and  disclaims  beneficial  ownership  of all shares of
Common Stock other than any shares  reported herein as being owned by it, him or
her, as the case may be.




                                                             Page 17 of 26 Pages

         Notwithstanding  this filing on Schedule  13D,  the  Reporting  Persons
disclaim any  requirement  to report  their  beneficial  ownership  interests on
Schedule  13D and reserve the future right to report such  beneficial  ownership
interests on Schedule 13G pursuant to Rule 13d-1(c).

         The Agreement of Reporting Persons is attached hereto as Exhibit A.

         (b) The  address  of the  principal  business  office  for  each of the
Reporting Persons is: c/o Worldview Capital,  435 Tasso Street,  Suite 120, Palo
Alto, California 94301.

         (c) The principal business of WVTP IV, WVTI IV, WVSP IV, WVTP III, WVTI
III,  WVSP III and  WVCF III is to  assist  growth-oriented  businesses  located
primarily in the United  States.  The principal  business of WVC IV is to act as
general  partner of WVTP IV, WVTI IV and WVSP IV. The principal  business of WVC
III is to act as general  partner of WVTP III,  WVTI III, WVSP III and WVCF III.
The principal  business of WVE I is to act as general  partner of WVC IV and WVC
III. and other venture  capital  investment  funds.  The principal  business and
occupation of each of the Partners and Weingarten is to act as general partners,
managing members,  shareholders,  directors, agents or officers of the Worldview
Entities  and a number of  partnerships  and limited  liability  companies  with
similar businesses.

         (d) None of the  Reporting  Persons  has been  convicted  in a criminal
proceeding  in the past five  years  (excluding  traffic  violations  or similar
misdemeanors).

         (e) During the past five  years,  none of the  Reporting  Persons was a
party to a civil  proceeding of a judicial or  administrative  body of competent
jurisdiction  as a result of which such  person was or is subject to a judgment,
decree  or final  order  enjoining  future  violations  of,  or  prohibiting  or
mandating activities subject to, federal or state securities laws or finding any
violation with respect to such laws.

         (f) WVC IV, WVTP IV, WVTI IV,WVSP IV, WVC III, WVTP III, WVTI III, WVSP
III and WVCF III are Delaware limited partnerships.  WVE I is a Delaware limited
liability company. Wei is a Canadian citizen.  Orsak and Weingarten are a United
States citizens. Tanaka is a Japanese citizen.


ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

         On March 30, 2004,  the Company  entered into an Agreement  and Plan of
Merger (listed as Exhibit G hereto, the "Merger  Agreement")  whereby, as of the
effective date of such agreement, the shares of common stock of Symposium Omega,
Inc.  ("Symposium")  were  automatically  converted into Series J  Participating
Convertible  Preferred  Stock of the  Company,  par value  $0.001 (the "Series J
Preferred  Stock").  WVTP IV, WVTI IV and WVSP IV previously  held 150 shares of
common stock of Symposium,  all of which was converted into 150 shares of Series
J Preferred Stock of the Company.

         Upon the  satisfaction  of the  conditions  to close  set  forth in the
Merger  Agreement,  on March 30,  2004,  WVTP IV received 128 shares of Series J
Preferred  Stock in exchange for 128 shares of Symposium  common stock;  WVTI IV
received  21 shares of Series J  Preferred  Stock in  exchange  for 21 shares of
Symposium common stock; and WVSP IV received 1 share of Series J Preferred Stock
in exchange for 1 share of Symposium  common stock.  The  consideration  paid by
each  Reporting  Person for each  foregoing  purchase  price was paid  solely in
exchange for all of the shares of Symposium  common stock held by such Reporting
Person. No part of the purchase price was borrowed by such Reporting Persons for
the purpose of acquiring such securities.




                                                             Page 18 of 26 Pages

         Each share of Series J Preferred Stock will be convertible  into Common
Stock at an initial conversion price of $0.16130000, or at an initial conversion
rate of approximately  30,998.15 shares of Common Stock for each share of Series
J Preferred Stock converted.

         All such  conversion  ratios are  subject to  antidilution  adjustments
(subject to certain  exceptions)  and certain other  adjustments as set forth in
the  Certificate  of  Designations,  Preferences  and  Relative,  Participating,
Optional  and  Other  Special  Rights  and   Qualifications,   Limitations   and
Restrictions  of Series J  Preferred  Stock of the  Company  listed as Exhibit J
hereto (the "Certificate of Designation").

         This Item 3 (and the other  Items of this  statement)  do not provide a
complete  description of the Merger  Agreement or the Certificate of Designation
and each such  description  is  qualified  in its  entirety by  reference to the
respective  agreement or document,  which are listed as Exhibits G and H hereto,
respectively.


ITEM  4. PURPOSE OF TRANSACTION.

         Each of WVTP IV,  WVTI IV, WVSP IV,  WVTP III,  WVTI III,  WVSP III and
WVCF  III  holds  the  securities  described  in  Item 5 of this  statement  for
investment purposes only.

         The Company  entered into the Merger  Agreement,  pursuant to which the
Company issued, and each of WVTP IV, WVTI IV and WVSP IV received, the number of
shares of Series J Preferred  Stock as described in Item 3 above. As a condition
to the closing under the Merger Agreement,  the Company is obligated to file the
Certificate of Designation, which provides that the Series J Preferred Stock has
certain  "weighted  average"   antidilution   protection  with  respect  to  the
conversion  price of the  Series J  Preferred  Stock  and  certain  liquidation,
conversion and voting rights.  Descriptions of such rights  contained herein are
qualified  in their  entirety by  reference to the  Certificate  of  Designation
listed as Exhibit H hereto.

         Certificate  of  Designation - Conversion of Series J Preferred  Stock.
Pursuant  to the  Certificate  of  Designation,  all of the  shares  of Series J
Preferred  Stock shall be  automatically  converted  into Common  Stock upon the
public  offering by the Company of its Common  Stock in which the cash  proceeds
are at least $50,000,000.  The Series J Preferred Stock may also be converted at
any time at the election of each holder.

         Certificate of Designation - Dividends.  In the event that any dividend
or other  distribution  payable in cash or other  property  is  declared  on the
Common  Stock or any  security  that is pari  passu or  junior  to the  Series J
Preferred Stock (other than dividends payable solely in shares of Common Stock),
the shares of Series J  Preferred  Stock  shall be entitled to receive an amount
equal per share (on an as-if converted to Common Stock basis) to the amount paid
or set aside for each share of Common Stock or other security that is pari passu
or junior to the Series J Preferred  Stock. As of the date hereof,  there are no
dividends declared on the Series J Preferred Stock.

         Certificate of Designation - Voting. As set forth in the Certificate of
Designation,  and except as otherwise provided by applicable law, the holders of
Series J  Preferred  Stock (i) shall be  entitled  to vote with the  holders  of
Common  Stock on all  matters  submitted  for a vote of holders of Common  Stock
except for a vote with respect to the  election of  directors  and (ii) shall be
entitled  to one vote for each  share of Common  Stock  such  holder of Series J
Preferred  Stock  would  receive  upon  conversion  of such  share  of  Series J
Preferred Stock into Common Stock.

         Certificate  of Designation - Liquidation  Preference.  In the event of
the  Company's  liquidation,  dissolution  or  winding  up or upon a  merger  or
acquisition  of the Company by another  company or person or any other change in
control  transaction,  the  holders  of the  Series J  Preferred  Stock  will be
entitled to a




                                                             Page 19 of 26 Pages

primary  liquidation  preference  before any  amounts are paid to the holders of
Common  Stock or any other  equity  securities  of the  Company  (other than the
primary  liquidation  preference  of  the  Series  F  Participating  Convertible
Preferred Stock,  Series G Participating  Convertible  Preferred Stock, Series H
Participating Convertible Preferred Stock and Series I Participating Convertible
Preferred Stock (collectively,  the "Other Preferred Stock"),  which liquidation
preference  shall be pari passu with the primary  liquidation  preference of the
Series J Preferred Stock).  The primary  liquidation  preference of the Series J
Preferred Stock is equal to the amount of consideration originally exchanged for
the Series J Preferred  Stock, or $5,000 per share. In addition,  the holders of
the  Series J  Preferred  Stock  will be  entitled  to a  secondary  liquidation
preference  before any additional  amounts are paid to the holders of the Common
Stock or any other  equity  securities  of the  Company  (other than the primary
liquidation   preference  of  the  Other  Preferred  Stock,   which  liquidation
preference shall be pari passu with the secondary liquidation  preference of the
Series J Preferred Stock). The secondary liquidation  preference of the Series J
Preferred Stock is equal to $10,000 per share.  In addition,  the holders of the
Series J Preferred Stock shall  participate with the holders of the Common Stock
and  the  Other  Preferred  Stock  ratably  on an  as-converted  basis,  in  the
distribution of the remaining assets of the Company available for distribution.

         Stockholders Agreement - Board Representation.  In connection with, and
pursuant  to, the Merger  Agreement,  WVTP IV, WVTI IV, WVSP IV, WVTP III,  WVTI
III,  WVSP  III  and  WVCF  III  entered  into  a  Third  Amended  and  Restated
Stockholders Agreement, dated as of March 30, 2004, by and among the Company and
certain  stockholders of the Company (the "Stockholders  Agreement"),  listed as
Exhibit  I hereto.  Pursuant  to the terms of  Stockholders  Agreement,  certain
investors  are  entitled to nominate  persons to the Board of  Directors  of the
Company,  and each of the  stockholders  that  are a party  to the  Stockholders
Agreement  agree to vote his or its shares of Common Stock to elect such persons
to the Board of Directors of the Company. Worldview Technology Partners (and its
affiliates)  is entitled to nominate  one member to the current ten member Board
of Directors of the Company.

         Stockholders Agreement - Protective  Provisions.  Pursuant to the terms
of the Stockholders Agreement,  the Company may not, without first obtaining the
approval  of the  holders  of not less than  two-thirds  (2/3) of the issued and
outstanding  shares of Series G Preferred  Stock,  Series I Preferred  Stock and
Series J Preferred  Stock,  voting  together as a single class,  (i)  designate,
authorize,  create,  issue,  sell,  redeem or repurchase  shares of any class or
series  of  capital  stock,  (ii)  declare  or pay any  dividends  or  make  any
distributions with respect to any outstanding  equity securities,  (iii) approve
the merger,  consolidation,  dissolution  or  liquidation  of the Company or any
subsidiary,  (iv) increase of decrease the number of authorized shares of Common
Stock or preferred stock of the Company,  (v) sell all or  substantially  all of
the assets of the Company and its subsidiaries,  (vi) cause a material change in
the  nature of the  business  or  strategic  direction  of the  Company  and its
subsidiaries,  (vii)  approve the filing for  bankruptcy  or any decision not to
take action to prevent a filing for bankruptcy or oppose an  involuntary  filing
for bankruptcy, (viii) approve the establishment and maintenance of an Executive
Committee  of the Board of  Directors  or  increase  or  decrease  the number of
directors  composing the Board of Directors or (ix) amend,  repeal or modify any
provision  of the  Company's  certificate  of  incorporation  in a  manner  that
adversely affects the rights, powers or preferences of the Preferred Stock.

         Stockholders   Agreement  -  Right  of  First  Offer  With  Respect  to
Additional Issuances of Securities by the Company . Pursuant to the terms of the
Stockholders  Agreement,  the Company is obligated to offer any additional sales
or other  issuances of securities of the Company first to the  stockholders  who
are a party to the Stockholders  Agreement and hold at least a certain number of
shares  of  preferred  stock of the  Company  as set  forth in the  Stockholders
Agreement.  As of the  date  hereof,  Worldview  Technology  Partners  (and  its
affiliated funds) is entitled to such right to first offer.

         Stockholders   Agreement  -  Right  of  First   Refusal  and  Right  of
Participation  With  Respect to Stock Held by David  Schaeffer.  Pursuant to the
terms of the  Stockholders  Agreement,  the  stockholders who are




                                                             Page 20 of 26 Pages

a party to the Stockholders  Agreement have a right of first refusal and a right
of  participation  with respect to certain  dispositions  of securities  held by
David Schaeffer.

         Registration  Rights Agreement - Registration of Shares of Common Stock
for Resale. In connection with, and pursuant to, the Merger Agreement,  WVTP IV,
WVTI IV,  WVSP IV,  WVTP III,  WVTI III,  WVSP III and WVCF III  entered  into a
Fourth Amended and Restated  Registration  Rights Agreement with the Company and
certain other investors,  dated as of March 30, 2004 (the  "Registration  Rights
Agreement"),  listed  as  Exhibit  J  hereto.  Pursuant  to  the  terms  of  the
Registration  Rights  Agreement,  at any time after the  earlier of (i) the date
which is three years after the date of the  Registration  Rights  Agreement  and
(ii) the date that is 6 months after the first public  offering of securities of
the Company after the date of the Registration Rights Agreement,  the holders of
more than 50% of the Common Stock issued or issuable upon the  conversion of the
Preferred Stock (or otherwise distributed in respect of the Preferred Stock) may
request the Company to register  the Common  Stock  issued or issuable  upon the
conversion of the Preferred  Stock (or otherwise  distributed  in respect of the
Preferred Stock).

         The  foregoing  summary of the Merger  Agreement,  the  Certificate  of
Designation,  the Stockholders  Agreement and the Registration  Rights Agreement
and the agreements  and  transactions  contemplated  thereby is qualified in its
entirety by reference to the Merger  Agreement,  the Certificate of Designation,
the Stockholders  Agreement and the  Registration  Rights  Agreement,  listed as
Exhibits  G,  H,  I and J  hereto,  respectively,  and  incorporated  herein  by
reference.

         Except  as set forth  above in this  statement,  none of the  Reporting
Persons has any present  plans or  proposals  that relate to or would result in:
(i) the  acquisition by any person of additional  securities of the Company,  or
the disposition of securities of the Company;  (ii) an  extraordinary  corporate
transaction,  such as a merger,  reorganization  or  liquidation,  involving the
Company  or any of its  subsidiaries;  (iii) a sale or  transfer  of a  material
amount of assets of the Company or any of its  subsidiaries;  (iv) any change in
the present Board of Directors or management of the Company, including any plans
or  proposals  to change the number or term of directors or to fill any existing
vacancies on the board; (v) any material change in the present capitalization or
dividend policy of the Company;  (vi) any other material change in the Company's
business or corporate structure; (vii) changes in the Company's charter, by-laws
or  instruments  corresponding  thereto  or other  actions  which may impede the
acquisition  of control of the Company by any person;  (viii) causing a class of
securities of the Company to be delisted from a national  securities exchange or
to cease to be authorized to be quoted in an inter-dealer  quotation system of a
registered national securities association; (ix) a class of equity securities of
the Company  becoming  eligible  for  termination  of  registration  pursuant to
Section  12(g)(4) of the Exchange Act; or (x) any action similar to any of those
enumerated above.


ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER.

         (a) and (b) The  approximate  percentages  of shares  of  Common  Stock
reported as beneficially owned by the Reporting Persons is based upon 14,300,575
shares of Common  Stock  outstanding  as of March 30,  2004,  as reported by the
Company  to the  Reporting  Persons,  plus  68,199,901  shares of  Common  Stock
issuable upon the conversion of the Series F Preferred Stock; 254,942,365 shares
of Common  Stock  issuable  upon  conversion  of the Series G  Preferred  Stock;
41,180,769  shares of Common Stock  issuable upon the conversion of the Series H
Preferred Stock;  15,962,585 shares of Common Stock issuable upon the conversion
of the Series I Preferred Stock; and 120,605,215 shares of Common Stock issuable
upon the conversion of the Series J Preferred Stock.

         In order to provide accurate  disclosure with respect to the percentage
of Common Stock reported as beneficially owned by each of the Reporting Persons,
the percentage  beneficially  owned by each Reporting Person was calculated on a
fully diluted, as converted basis of all of the Company's issued and




                                                             Page 21 of 26 Pages

outstanding  Series F  Preferred  Stock,  Series  G  Preferred  Stock,  Series H
Preferred  Stock,  Series  I  Preferred  Stock  and  Series J  Preferred  Stock,
including shares held by third parties. In the interests of full disclosure,  if
such  percentage for each Reporting  Person was based solely on the Common Stock
outstanding  plus the shares of Common Stock  issuable  upon  conversion  of the
Preferred Stock deemed to be beneficially  owned by such Reporting  Person,  the
percentages would be as follows:  54.9% for WVTP IV, 16.1% for WVTI IV, 0.9% for
WVSP IV, 73.0% for WVTP III,  38.3% for WVTI III,  5.2% for WVSP III,  11.9% for
WVCF III,  78.7% for WVC III,  58.9% for WVC IV, and 84.7% for each of WVE I and
each of the Partners and Weingarten.

         Amounts shown as  beneficially  owned by each of WVTP III, WVC III, WVE
I, Wei,  Orsak,  Tanaka and  Weingarten  include (i) 1,294,299  shares of Common
Stock directly owned by WVTP III and (ii) 33,879,063 shares of Common Stock into
which  the  shares  of  Preferred  Stock  owned  by WVTP  III  may be  initially
converted.

         Amounts shown as  beneficially  owned by each of WVTI III, WVC III, WVE
I, Wei, Orsak,  Tanaka and Weingarten include (i) 319,034 shares of Common Stock
directly owned by WVTI III and (ii) 8,350,270  shares of Common Stock into which
the shares of Preferred Stock owned by WVTI III may be initially converted.

         Amounts shown as  beneficially  owned by each of WVSP III, WVC III, WVE
I, Wei, Orsak,  Tanaka and Weingarten  include (i) 28,679 shares of Common Stock
directly  owned by WVSP III and (ii)  748,645  shares of Common Stock into which
the shares of Preferred Stock owned by WVSP III may be initially converted.

         Amounts shown as  beneficially  owned by each of WVCF III, WVC III, WVE
I, Wei, Orsak,  Tanaka and Weingarten  include (i) 31,725 shares of Common Stock
directly owned by WVCF III and (ii) 1,900,406  shares of Common Stock into which
the shares of Preferred Stock owned by WVCF III may be initially converted.

         Amounts shown as beneficially  owned by each of WVTP IV, WVC IV, WVE I,
Wei,  Orsak,  Tanaka and  Weingarten  include (i) 548,531 shares of Common Stock
directly owned by WVTP IV and (ii) 16,154,781  shares of Common Stock into which
the shares of Preferred Stock owned by WVTP IV may be initially converted.

         Amounts shown as beneficially  owned by each of WVTI IV, WVC IV, WVE I,
Wei,  Orsak,  Tanaka and  Weingarten  include (i) 89,115  shares of Common Stock
directly owned by WVTI IV and (ii)  2,630,763  shares of Common Stock into which
the shares of Preferred Stock owned by WVTI IV may be initially converted.

         Amounts shown as beneficially  owned by each of WVSP IV, WVC IV, WVE I,
Wei,  Orsak,  Tanaka and  Weingarten  include (i) 4,048  shares of Common  Stock
directly owned by WVSP IV and (ii) 126,128 shares of Common Stock into which the
shares of Preferred Stock purchased by WVSP IV may be initially converted.

         By virtue of their potential  status as a "group" with the stockholders
of  the  Company  that  are  parties  to  the   Stockholders   Agreement  (which
stockholders  are set forth in Item 6 below)  due to the voting  agreement  with
respect to the appointment of directors set forth in the Stockholders Agreement,
for purposes of Rule 13d-5,  each of the Reporting Persons may be deemed to have
shared voting and dispositive power over the shares owned by such  stockholders.
Except to the extent  explicitly  set forth  herein,  neither the filing of this
statement  nor any of its contents  shall be deemed to  constitute  an admission
that any Reporting  Person is the beneficial  owner of any Common Stock referred
to in this




                                                             Page 22 of 26 Pages

statement  for the purposes of Section 13(d) of the  Securities  Exchange Act of
1934 or for any  other  purpose,  and such  beneficial  ownership  is  expressly
disclaimed.

         Please see Items 7, 8, 9, 10, 11, and 13 for each cover  sheet for each
Reporting Person.

         (c) Except as set forth in Item 4 above,  none of the Reporting Persons
has effected any transaction in the Common Stock during the past 60 days.

         (d)  Except  as set forth in this  Item 5, no  person  other  than each
respective  record owner  referred to herein of  securities is known to have the
right to receive or the power to direct the receipt of  dividends  from,  or the
proceeds from the sale of, such securities.

         (e) Not applicable.


ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO
        SECURITIES OF THE ISSUER.

         Pursuant to Rule  13d-1(k)  promulgated  under the  Exchange  Act,  the
Reporting  Persons have entered into an agreement  attached hereto as Exhibit A,
with  respect  to the  joint  filing  of this  statement  and any  amendment  or
amendments hereto.

         The Merger  Agreement  was entered into as of March 30,  2004.  Certain
terms and conditions of the Merger  Agreement and the Certificate of Designation
are described in Items 3 - 5 above.

         The Stockholders Agreement was entered into as of March 30, 2004 by the
Company,  Oak  Investment  Partners IX, Oak IX Affiliates  Fund,  Oak Investment
Partners  Affiliates Fund - A, Jerusalem  Venture Partners III, L.P.,  Jerusalem
Venture Partners III (Israel),  L.P.,  Jerusalem Venture Partners  Entrepreneurs
Fund III, L.P.,  Jerusalem Venture Partners IV, L.P., Jerusalem Venture Partners
IV (Israel),  L.P.,  Jerusalem Venture Partners IV - A, L.P.,  Jerusalem Venture
Partners  Entrepreneurs Fund IV, L.P.,  Worldview Technology Partners III, L.P.,
Worldview Technology  International III, L.P., Worldview Strategic Partners III,
L.P.,  Worldview III Carrier Fund, L.P., Worldview Technology Partners IV, L.P.,
Worldview  Technology  International IV, L.P.,  Worldview Strategic Partners IV,
L.P.,  Broadview  Capital Partners L.P.,  Broadview  Capital Partners  Qualified
Purchaser Fund L.P.,  Broadview  Capital  Partners  Affiliates Fund LLC, Boulder
Ventures III, L.P.,  Boulder Ventures III (Annex),  L.P., NAS Partners I L.L.C.,
Nassau  Capital  Partners IV, L.P.,  Cisco Systems  Capital  Corporation,  David
Schaeffer and certain other stockholders whose names are set forth on Schedule I
to the Stockholders Agreement.  Certain terms and conditions of the Stockholders
Agreement are described in Item 4 above.

         The  Registration  Rights  Agreement  was entered  into as of March 30,
2004.  Certain terms and  conditions of the  Registration  Rights  Agreement are
described in Item 4 above.


ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS.

Exhibit A         Amended and Restated  Agreement of  Reporting  Persons,  dated
                  March 30, 2004, among the Reporting Persons.

Exhibit  G        Agreement  and Plan of Merger,  dated as of March 30, 2003, by
                  and among the Company and the investors  named therein  (filed
                  as Exhibit 2.6 to the 10-K filed with the  Commission on March
                  30, 2004, and incorporated herein by reference).

Exhibit H         Corrected   Certificate  of   Designations,   Preferences  and
                  Relative, Participating, Optional and Other Special Rights and
                  Qualifications,  Limitations  and  Restrictions  of  Series  J



                                                             Page 23 of 26 Pages

                  Participating  Convertible  Preferred  Stock  of  the  Company
                  (filed as Exhibit 3.7 to the 10-K filed with the Commission by
                  the  Company on March 30,  2004,  and  incorporated  herein by
                  reference).

Exhibit I         Third Amended and Restated Stockholders Agreement, dated as of
                  March 30, 2004, by and among the Company and the  stockholders
                  named  therein  (filed as Exhibit  10.1 to the 10-K filed with
                  the Commission on March 30, 2004, and  incorporated  herein by
                  reference).

Exhibit J         Fourth  Amended and Restated  Registration  Rights  Agreement,
                  dated as of March 30,  2004,  by and among the Company and the
                  stockholders  named therein (filed as Exhibit 10.2 to the 10-K
                  filed with the Commission on March 30, 2004, and  incorporated
                  herein by reference).



                                                             Page 24 of 26 Pages

Signature

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

Date:  March 31, 2004


                                 JAMES WEI

                                 By: ___________________________________________
                                 James Wei, individually,  and on behalf of WVTP
                                 IV, in his  capacity  as a member of WVE I, the
                                 general  partner of WVC IV, the general partner
                                 of  WVTP  IV,  on  behalf  of WVTI  IV,  in his
                                 capacity  as a  member  of WVE I,  the  general
                                 partner of WVC IV, the general  partner of WVTI
                                 IV, on behalf of WVSP IV, in his  capacity as a
                                 member of WVE I, the general partner of WVC IV,
                                 the  general  partner  of WVSP IV, on behalf of
                                 WVC IV, in his  capacity  as a member of WVE I,
                                 the general  partner of WVC I, and on behalf of
                                 WVE I in his capacity as a member  thereof;  on
                                 behalf of WVTP III, in his capacity as a member
                                 of WVE I, the general  partner of WVC III,  the
                                 general  partner of WVTP III, on behalf of WVTI
                                 III, in his  capacity as a member of WVE I, the
                                 general partner of WVC III, the general partner
                                 of WVTI III,  on  behalf  of WVSP  III,  in his
                                 capacity  as a  member  of WVE I,  the  general
                                 partner of WVC III, the general partner of WVSP
                                 III, on behalf of WVCF III, in his  capacity as
                                 a member of WVE I, the  general  partner of WVC
                                 III, the general partner of WVCF III, on behalf
                                 of WVC III, in his  capacity as a member of WVE
                                 I,  the  general  partner  of WVC  III,  and on
                                 behalf  of WVE I in his  capacity  as a  member
                                 thereof.


                                 MICHAEL ORSAK

                                 By: ___________________________________________
                                     Michael Orsak


                                 SUSUMU TANAKA

                                 By: ___________________________________________
                                     Susumu Tanaka


                                 TIM WEINGARTEN

                                 By: ___________________________________________
                                     Tim Weingarten



                                                             Page 25 of 26 Pages

                                INDEX TO EXHIBITS

EXHIBIT A         Amended and Restated  Agreement of  Reporting  Persons,  dated
                  March 30, 2004, among the Reporting Persons.

EXHIBIT G         Agreement  and Plan of Merger,  dated as of March 30, 2003, by
                  and among the Company and the investors  named therein  (filed
                  as Exhibit 2.6 to the 10-K filed with the  Commission on March
                  30, 2004, and  incorporated  herein by  reference).

EXHIBIT H         Corrected   Certificate  of   Designations,   Preferences  and
                  Relative, Participating, Optional and Other Special Rights and
                  Qualifications,  Limitations  and  Restrictions  of  Series  J
                  Participating  Convertible  Preferred  Stock  of  the  Company
                  (filed as Exhibit 3.7 to the 10-K filed with the Commission by
                  the  Company on March 30,  2004,  and  incorporated  herein by
                  reference).

EXHIBIT I         Third Amended and Restated Stockholders Agreement, dated as of
                  March 30, 2004, by and among the Company and the  stockholders
                  named  therein  (filed as Exhibit  10.1 to the 10-K filed with
                  the Commission on March 30, 2004, and  incorporated  herein by
                  reference).

EXHIBIT J         Fourth  Amended and Restated  Registration  Rights  Agreement,
                  dated as of March 30,  2004,  by and among the Company and the
                  stockholders  named therein (filed as Exhibit 10.2 to the 10-K
                  filed with the Commission on March 30, 2004, and  incorporated
                  herein by reference).



                                                             Page 26 of 26 Pages

                                    Exhibit A

                         Agreement of Reporting Persons

         The  undersigned  hereby  agree  that a  single  Schedule  13D  (or any
amendment thereto) relating to the Common Stock of Cogent  Communications,  Inc.
shall be filed on behalf  of each of the  undersigned  and that  this  Agreement
shall be filed as an exhibit to such Schedule 13D.


Date:  March 31, 2004


                                 JAMES WEI

                                 By: ___________________________________________
                                 By: James Wei,  individually,  and on behalf of
                                 WVTP IV, in his  capacity as a member of WVE I,
                                 the  general  partner  of WVC IV,  the  general
                                 partner  of WVTP IV,  on  behalf of WVTI IV, in
                                 his  capacity as a member of WVE I, the general
                                 partner of WVC IV, the general  partner of WVTI
                                 IV, on behalf of WVSP IV, in his  capacity as a
                                 member of WVE I, the general partner of WVC IV,
                                 the  general  partner  of WVSP IV, on behalf of
                                 WVC IV, in his  capacity  as a member of WVE I,
                                 the general  partner of WVC I, and on behalf of
                                 WVE I in his capacity as a member  thereof;  on
                                 behalf of WVTP III, in his capacity as a member
                                 of WVE I, the general  partner of WVC III,  the
                                 general  partner of WVTP III, on behalf of WVTI
                                 III, in his  capacity as a member of WVE I, the
                                 general partner of WVC III, the general partner
                                 of WVTI III,  on  behalf  of WVSP  III,  in his
                                 capacity  as a  member  of WVE I,  the  general
                                 partner of WVC III, the general partner of WVSP
                                 III, on behalf of WVCF III, in his  capacity as
                                 a member of WVE I, the  general  partner of WVC
                                 III, the general partner of WVCF III, on behalf
                                 of WVC III, in his  capacity as a member of WVE
                                 I,  the  general  partner  of WVC  III,  and on
                                 behalf  of WVE I in his  capacity  as a  member
                                 thereof.


                                 MICHAEL ORSAK

                                 By: ___________________________________________
                                     Michael Orsak


                                 SUSUMU TANAKA

                                 By: ___________________________________________
                                     Susumu Tanaka


                                 TIM WEINGARTEN

                                 By: ___________________________________________
                                     Tim Weingarten