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)

                                  Michael Carus
                           Jerusalem Venture Partners
                                 41 Madison Ave.
                                   25th Floor
                               New York, NY 10010
                                 (212) 479-5100
--------------------------------------------------------------------------------
                  (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 27 Pages)



CUSIP No. 19239V104               SCHEDULE 13D                Page 2 of 27 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Jerusalem Venture Partners IV, L.P. ("JVP 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

                        49,415,809, except that Jerusalem Partners IV, L.P. ("JP
                        IV"),  the  general  partner of JVP IV, may be deemed to
                        have sole  power to vote  these  shares;  JVP  Corp.  IV
                        ("JVPCIV"),  the general partner of JP IV, may be deemed
                        to have the sole  power to vote these  shares;  and Erel
                        Margalit  ("Margalit"),  as an officer of JVPCIV, may be
                        deemed to have sole 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               49,415,809,  except that JP IV, the  general  partner of
    WITH                JVP IV,  may be deemed to have sole  power to dispose of
                        these shares;  JVPCIV, the general partner of JP IV, may
                        be deemed  to have the sole  power to  dispose  of these
                        shares;  and Margalit,  as an officer of JVPCIV,  may be
                        deemed to have sole power to dispose of these shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

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

      49,415,809
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|


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

      9.6%*
--------------------------------------------------------------------------------
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 27 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Jerusalem Venture Partners IV-A, L.P. ("JVP IV-A")
--------------------------------------------------------------------------------
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

                        418,492  shares,  except that JP IV, the general partner
                        of JVP IV-A,  may be  deemed to have sole  power to vote
                        these shares;  JVPCIV, the general partner of JP IV, may
                        be deemed to have sole power to vote these  shares;  and
                        Margalit, as an officer of JVPCIV, may be deemed to have
                        sole 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               418,492  shares,  except that JP IV, the general partner
    WITH                of JVP IV-A, may be deemed to have sole power to dispose
                        of these shares;  JVPCIV,  the general partner of JP IV,
                        may be  deemed to have sole  power to  dispose  of these
                        shares;  and Margalit,  as an officer of JVPCIV,  may be
                        deemed to have sole power to dispose of these shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

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

      418,492
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|


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

      0.1%*
--------------------------------------------------------------------------------
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 27 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Jerusalem Venture Partners IV (Israel), L.P. ("JVP IV (Israel)")
--------------------------------------------------------------------------------
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

      Israel
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        1,191,472  shares,  except that Jerusalem  Partners IV -
                        Venture  Capital L.P. ("JP IV VC"), the general  partner
                        of JVP IV (Israel),  may be deemed to have sole power to
                        vote these shares;  JVPCIV, the general partner of JP IV
                        VC,  may be  deemed  to have  sole  power to vote  these
                        shares;  and Margalit,  as an officer of JVPCIV,  may be
                        deemed to have sole 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               1,191,472  shares,  except  that JP IV VC,  the  general
    WITH                partner of JVP IV  (Israel),  may be deemed to have sole
                        power to dispose of these  shares;  JVPCIV,  the general
                        partner of JP IV VC, may be deemed to have sole power to
                        dispose of these shares; and Margalit,  as an officer of
                        JVPCIV,  may be deemed to have sole  power to dispose of
                        these shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

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

      1,191,472
--------------------------------------------------------------------------------
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 5 of 27 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Jerusalem Venture Partners Entrepreneurs Fund IV, L.P. ("JVP E-Fund 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

                        444,644  shares,  except that JP IV, the general partner
                        of JVP  E-Fund  IV,  may be deemed to have sole power to
                        vote these shares;  JVPCIV,  the general  partner of JVP
                        IV,  may be  deemed  to have  sole  power to vote  these
                        shares;  and Margalit,  as an officer of JVPCIV,  may be
                        deemed to have sole 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               444,644  shares,  except that JP IV, the general partner
    WITH                of JVP  E-Fund  IV,  may be deemed to have sole power to
                        vote these shares;  JVPCIV,  the general  partner of JVP
                        IV,  may be  deemed  to have  sole  power to vote  these
                        shares;  and Margalit,  as an officer of JVPCIV,  may be
                        deemed to have sole power to vote these shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

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

      444,644
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|


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

      0.1%*
--------------------------------------------------------------------------------
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 27 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Jerusalem Venture Partners III, L.P. ("JVP 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


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

                        42,684,797,  except that  Jerusalem  Partners  III, L.P.
                        ("JP  III"),  the  general  partner  of JVP III,  may be
                        deemed  to  have  sole  power  to  vote  these   shares;
                        Jerusalem  Venture Partners  Corporation  ("JVPC"),  the
                        general  partner  of JP III,  may be  deemed to have the
                        sole power to vote these  shares;  and  Margalit,  as an
                        officer  of JVPC,  may be deemed  to have sole  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               42,684,797,  except that JP III, the general  partner of
    WITH                JVP III,  may be deemed to have sole power to dispose of
                        these shares;  JVPC, the general  partner of JP III, may
                        be deemed  to have the sole  power to  dispose  of these
                        shares;  and  Margalit,  as an officer  of JVPC,  may be
                        deemed to have sole power to dispose of these shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

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

      42,684,797
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|


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

      8.3%*
--------------------------------------------------------------------------------
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 27 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Jerusalem Venture Partners Entrepreneur Fund III, L.P. ("JVP E-Fund 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

                        3,280,012,  except that JP III,  the general  partner of
                        JVP E-Fund III, may be deemed to have sole power to vote
                        these shares;  JVPC, the general  partner of JP III, may
                        be deemed to have the sole power to vote  these  shares;
                        and  Margalit,  as an officer of JVPC,  may be deemed to
                        have sole 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               3,280,012,  except that JP III,  the general  partner of
    WITH                JVP  E-Fund  III,  may be deemed  to have sole  power to
                        dispose of these shares; JVPC, the general partner of JP
                        III,  may be deemed to have the sole power to dispose of
                        these shares;  and Margalit,  as an officer of JVPC, may
                        be deemed to have sole power to dispose of these shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

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

      3,280,012
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|


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

      0.6%*
--------------------------------------------------------------------------------
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 27 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Jerusalem Venture Partners III (Israel), L.P. ("JVP III (Israel)")
--------------------------------------------------------------------------------
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

      Israel
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        1,197,389,  except  that  JVP  III  (Israel)  Mgmt,  the
                        general  partner of JVP III  (Israel),  may be deemed to
                        have sole power to vote these shares;  and Margalit,  as
                        an officer of JVP III  (Israel)  Mgmt,  may be deemed to
                        have sole 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               1,197,389,  except  that  JVP  III  (Israel)  Mgmt,  the
    WITH                general  partner of JVP III  (Israel),  may be deemed to
                        have  sole  power  to  dispose  of  these  shares;   and
                        Margalit, as an officer of JVP III (Israel) Mgmt, may be
                        deemed to have sole power to dispose of these shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

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

      1,197,389
--------------------------------------------------------------------------------
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 27 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Jerusalem Partners IV, L.P.("JP 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

                        50,278,945  shares,  of which  49,415,809  are  directly
                        owned  by JVP IV,  444,644  are  directly  owned  by JVP
                        E-Fund IV and 418,492 are directly owned by JVP IV-A. JP
                        IV, the general partner of JVP IV, JVP E-Fund IV and JVP
                        IV-A,  may be deemed to have  sole  power to vote  these
                        shares;  JVPCIV,  the  general  partner of JP IV, may be
                        deemed  to have sole  power to vote  these  shares;  and
                        Margalit, as an officer of JVPCIV, may be deemed to have
                        sole 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               50,278,945  shares,  of which  49,415,809  are  directly
    WITH                owned  by JVP IV,  444,644  are  directly  owned  by JVP
                        E-Fund IV and 418,492 are directly owned by JVP IV-A. JP
                        IV, the general partner of JVP IV, JVP E-Fund IV and JVP
                        IV-A,  may be deemed to have sole  power to  dispose  of
                        these shares;  JVPCIV, the general partner of JP IV, may
                        be deemed to have sole power to dispose of these shares;
                        and Margalit,  as an officer of JVPCIV, may be deemed to
                        have sole power to dispose of these shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

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

      50,278,945
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                       |X|


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

      9.8%*
--------------------------------------------------------------------------------
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 10 of 27 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Jerusalem Partners IV - Venture Capital, L.P.("JP IV VC")
--------------------------------------------------------------------------------
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

      Israel
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        1,191,472  shares  which  are  directly  owned by JVP IV
                        (Israel).  JP IV  VC,  the  general  partner  of  JVP IV
                        (Israel)  may be deemed to have sole power to vote these
                        shares;  JVPCIV, the general partner of JP IV VC, may be
                        deemed  to have sole  power to vote  these  shares;  and
                        Margalit, as an officer of JVPCIV, may be deemed to have
                        sole 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               1,191,472  shares  which  are  directly  owned by JVP IV
    WITH                (Israel).  JP IV  VC,  the  general  partner  of  JVP IV
                        (Israel)  may be deemed to have sole power to dispose of
                        these shares;  JVPCIV,  the general partner of JP IV VC,
                        may be  deemed to have sole  power to  dispose  of these
                        shares;  and Margalit,  as an officer of JVPCIV,  may be
                        deemed to have sole power to dispose of these shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

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

      1,191,472
--------------------------------------------------------------------------------
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 11 of 27 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Jerusalem Partners III, L.P.("JP 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

                        45,964,809  shares,  of which  42,684,797  are  directly
                        owned by JVP III and 3,280,012 are directly owned by JVP
                        E-Fund III. JP III,  the general  partner of JVP III and
                        JVP E-Fund III, may be deemed to have sole power to vote
                        these shares;  JVPC, the general  partner of JP III, may
                        be deemed to have sole power to vote these  shares;  and
                        Margalit,  as an officer of JVPC,  may be deemed to have
                        sole 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               45,964,809  shares,  of which  42,684,797  are  directly
    WITH                owned by JVP III and 3,280,012 are directly owned by JVP
                        E-Fund III. JP III,  the general  partner of JVP III and
                        JVP  E-Fund  III,  may be deemed  to have sole  power to
                        dispose of these shares; JVPC, the general partner of JP
                        III,  may be  deemed to have sole  power to  dispose  of
                        these shares;  and Margalit,  as an officer of JVPC, may
                        be deemed to have sole power to dispose of these shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

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

      45,964,809
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|


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

      8.9%*
--------------------------------------------------------------------------------
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 12 of 27 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Jerusalem Venture Partners III (Israel) Management Company Ltd.
      ("JVP III (Israel) Mgmt")
--------------------------------------------------------------------------------
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

      Israel
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        1,197,389 shares, all of which are directly owned by JVP
                        III (Israel). JVP III (Israel) Mgmt, the general partner
                        of JVP III (Israel), may be deemed to have sole power to
                        vote these shares;  and  Margalit,  as an officer of JVP
                        III (Israel)  Mgmt,  may be deemed to have sole 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               1,197,389 shares, all of which are directly owned by JVP
    WITH                III (Israel). JVP III (Israel) Mgmt, the general partner
                        of JVP III (Israel), may be deemed to have sole power to
                        dispose of these shares; and Margalit,  as an officer of
                        JVP III (Israel)  Mgmt, may be deemed to have sole power
                        to dispose of these shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

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

      1,197,389
--------------------------------------------------------------------------------
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*

      CO
--------------------------------------------------------------------------------
* 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 27 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Jerusalem Venture Partners Corporation ("JVPC")
--------------------------------------------------------------------------------
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

      Cayman Islands
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        45,964,809  shares,  of which  42,684,797  are  directly
                        owned by JVP III and 3,280,012 are directly owned by JVP
                        E-Fund III. JVPC, is the general  partner of JP III, the
                        general  partner of JVP III and JVP E-Fund III,  and may
                        be deemed to have sole power to vote these  shares;  and
                        Margalit,  as an officer of JVPC,  may be deemed to have
                        sole 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               45,964,809  shares,  of which  42,684,797  are  directly
    WITH                owned by JVP III and 3,280,012 are directly owned by JVP
                        E-Fund III. JVPC, is the general  partner of JP III, the
                        general  partner of JVP III and JVP E-Fund III,  and may
                        be deemed to have sole power to dispose of these shares;
                        and  Margalit,  as an officer of JVPC,  may be deemed to
                        have sole power to dispose of these shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

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

      45,964,809
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|


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

      8.9%*
--------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      CO
--------------------------------------------------------------------------------
* 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 27 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      JVP Corp. IV ("JVPCIV")
--------------------------------------------------------------------------------
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

      Cayman Islands
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        51,470,417  shares,  of which  49,415,809  are  directly
                        owned JVP IV,  418,492 are  directly  owned by JVP IV-A,
                        444,644  are  directly   owned  by  JVP  E-Fund  IV  and
                        1,191,472 are directly owned by JVP IV (Israel). JVPCIV,
                        is the general  partner of JP IV, the general partner of
                        JVP IV,  JVP IV-A and JVP  E-Fund  IV,  and the  general
                        partner  of JP IV VC  the  general  partner  of  JVP  IV
                        (Israel),  and may be deemed to have sole  power to vote
                        these shares; and Margalit, as an officer of JVPCIV, may
                        be deemed to have sole 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               51,470,417  shares,  of which  49,415,809  are  directly
    WITH                owned JVP IV,  418,492 are  directly  owned by JVP IV-A,
                        444,644  are  directly   owned  by  JVP  E-Fund  IV  and
                        1,191,472 are directly owned by JVP IV (Israel). JVPCIV,
                        is the general  partner of JP IV, the general partner of
                        JVP IV,  JVP IV-A and JVP  E-Fund  IV,  and the  general
                        partner  of JP IV VC  the  general  partner  of  JVP  IV
                        (Israel),  and may be  deemed  to  have  sole  power  to
                        dispose of these shares; and Margalit,  as an officer of
                        JVPCIV,  may be deemed to have sole  power to dispose of
                        these shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

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

      51,470,417
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|


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

      10.0%*
--------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      CO
--------------------------------------------------------------------------------
* 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 27 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Erel Margalit ("Margalit")
--------------------------------------------------------------------------------
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

      Israeli Citizen
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        98,632,615  shares,  of which  49,415,809  are  directly
                        owned by JVP IV, 418,492 are directly owned by JVP IV-A,
                        444,644 are directly  owned by JVP E-Fund IV,  1,191,472
                        are directly  owned by JVP IV (Israel),  42,684,797  are
                        directly owned by JVP III,  3,280,012 are directly owned
                        by JVP E-Fund III, and 1,197,389  are directly  owned by
                        JVP III  (Israel).  Margalit  is an  officer  of JVPCIV,
                        which is the general  partner of (i) JP IV, which is the
                        general  partner  of JVP IV, JVP IV-A and JVP E-Fund IV,
                        and JP IV VC  which  is the  general  partner  of JVP IV
                        (Israel),  and  (ii) an  officer  of JVPC  which  is the
                        general  partner of JP III, which is the general partner
                        of JVP III and JVP E-Fund  III,  and (iii) an officer of
                        JVP III (Israel) Mgmt,  which is the general  partner of
                        JVP III  (Israel),  and may be deemed to have sole 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               98,632,615  shares,  of which  49,415,809  are  directly
    WITH                owned by JVP IV, 418,492 are directly owned by JVP IV-A,
                        444,644 are directly  owned by JVP E-Fund IV,  1,191,472
                        are directly  owned by JVP IV (Israel),  42,684,797  are
                        directly owned by JVP III,  3,280,012 are directly owned
                        by JVP E-Fund III, and 1,197,389  are directly  owned by
                        JVP III  (Israel).  Margalit  is an  officer  of JVPCIV,
                        which is the general  partner of (i) JP IV, which is the
                        general  partner  of JVP IV, JVP IV-A and JVP E-Fund IV,
                        and JP IV VC  which  is the  general  partner  of JVP IV
                        (Israel),  and  (ii) an  officer  of JVPC  which  is the
                        general  partner of JP III, which is the general partner
                        of JVP III and JVP E-Fund  III,  and (iii) an officer of
                        JVP III (Israel) Mgmt,  which is the general  partner of
                        JVP III  (Israel),  and may be deemed to have sole power
                        to dispose of these shares.
                        --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

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

      98,632,615
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |X|


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

      19.1%*
--------------------------------------------------------------------------------
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



                            Statement on Schedule 13D


         This  Amendment  No. 1 to  Schedule  13D is being  filed to report  the
acquisition of 529 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 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

         Item 3 is hereby amended by adding the following paragraph:

         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").  JVP IV, JVP IV-A, JVP E-Fund IV, JVP IV (Israel),  JVP III,
JVP E-Fund III and JVP III (Israel)  previously  held 529 shares of common stock
of Symposium,  all of which was converted  into 529 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,  JVP III received 45.2 shares of Series J
Preferred  Stock in exchange  for 45.2 shares of  Symposium  common  stock;  JVP
E-Fund III received  3.4 shares of Series J Preferred  Stock in exchange for 3.4
shares of Symposium common stock; JVP III (Israel) received 1.4 shares of Series
J Preferred Stock in exchange for 1.4 shares of Symposium  common stock;  JVP IV
received  459.8 shares of Series J Preferred  Stock in exchange for 459.8 shares
of Symposium  common  stock;  JVP IV-A received 3.8 shares of Series J Preferred
Stock in  exchange  for 3.8  shares of  Symposium  common  stock;  JVP E-Fund IV
received  4.2 shares of Series J Preferred  Stock in exchange  for 4.2 shares of
Symposium  common  stock;  and JVP IV (Israel)  received 11.2 shares of Series J
Preferred  Stock in exchange  for 11.2 shares 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.

         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  Certificates  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) does 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.


                                  Page 16 of 27


ITEM 4.  PURPOSE OF TRANSACTION.

         Each of JVP IV, JVP IV-A, JVP E-Fund IV, JVP IV (Israel),  JVP III, JVP
E-Fund III and JVP III (Israel) 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 JVP IV, JVP IV-A,  JVP E-Fund IV, JVP IV (Israel),
JVP III, JVP E-Fund III and JVP III (Israel)  received,  the number of shares of
Series J Preferred Stock all 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 such  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.

         Certificates  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 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


                                 Page 17 of 27


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,  JVP IV,  JVP IV-A,  JVP E-Fund IV, JVP IV
(Israel),  JVP III,  JVP E-Fund III and JVP III  (Israel)  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.  Jerusalem  Venture
Partners (and its affiliates) is entitled to nominate two members 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,  each of JVP  III  and  JVP IV  (and  their
affiliated funds) are entitled to such right of 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 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,  JVP IV,
JVP IV-A,  JVP E-Fund IV, JVP IV  (Israel),  JVP III, JVP E-Fund III and JVP III
(Israel)  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


                                 Page 18 of 27


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.

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, plus 68,199,901 shares
of Common  Stock  issuable  upon  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 conversion of
the Series H Preferred  Stock,  15,962,585  shares of Common Stock issuable upon
conversion of the Series I Preferred  Stock,  and  120,605,215  shares of Common
Stock issuable upon conversion of the Series J Preferred  Stock, all as reported
by the Company to the Reporting Persons.

         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 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:  77.0% for JVP III, 18.8% for JVP E-Fund III, 7.8% for JVP III (Israel)
and JPVIII  (Israel)  Mgmt,  79.0% for JVP IV,  2.8% for JVP IV-A,  3.0% for JVP
E-Fund IV, 7.7% for JVP IV (Israel)  and JP IV VC, 79.3% for JP IV, 78.5% for JP
III and JVPC, 79.7% for JVPCIV and 89.7% for Margalit.

         Amounts  shown as  beneficially  owned by each of JVP III, JP III, JVPC
and Margalit  include (i) 1,587,498 shares of Common Stock directly owned by JVP
III and (ii)  41,097,299  shares  of  Common  Stock  into  which  the  shares of
Preferred Stock purchased by JVP III may be initially converted.

         Amounts shown as beneficially  owned by each of JVP E-Fund III, JP III,
JVPC and Margalit  include (i) 122,030  shares of Common Stock directly owned by
JVP E-Fund III and (ii)  3,157,982  shares of Common Stock into which the shares
of Preferred Stock purchased by JVP E-Fund III may be initially converted.

         Amounts shown as  beneficially  owned by each of JVP III (Israel),  JVP
III  (Israel)  Mgmt and  Margalit  include  (i)  44,420  shares of Common  Stock
directly  owned by JVP III  (Israel) and (ii)  1,152,969  shares of Common Stock
into which the shares of  Preferred  Stock  purchased by JVP III (Israel) may be
initially converted.

         Amounts  shown as  beneficially  owned by each of JVP IV, JP IV, JVPCIV
and Margalit  include (i) 1,175,864 shares of Common Stock directly owned by JVP
IV and (ii) 48,239,945 shares of Common Stock into which the shares of Preferred
Stock purchased by JVP IV may be initially converted.

         Amounts shown as beneficially  owned by each of JVP IV-A, JP IV, JVPCIV
and Margalit include (i) 8,663 shares of Common Stock directly owned by JVP IV-A
and (ii) 409,829 shares


                                 Page 19 of 27


of Common Stock into which the shares of Preferred  Stock  purchased by JVP IV-A
may be initially converted.

         Amounts  shown as  beneficially  owned by each of JVP E-Fund IV, JP IV,
JVPCIV and Margalit include 444,644 shares of Common Stock into which the shares
of Preferred Stock purchased by JVP E-Fund IV may be initially converted.

         Amounts shown as beneficially  owned by each of JVP IV (Israel),  JP IV
VC, JVPCIV and Margalit include (i) 18,649 shares of Common Stock directly owned
by JVP IV  (Israel)  and (ii)  1,172,823  shares of Common  Stock into which the
shares  of  Preferred  Stock  purchased  by JVP  IV  (Israel)  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  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  Entrepreneur
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.,


                                 Page 20 of 27


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   Agreement of  Reporting  Persons,  dated  August 4, 2003,  among the
            Reporting Persons.

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


                                 Page 21 of 27


                                    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
                                   
                                      JERUSALEM VENTURE PARTNERS IV, L.P.,
                                      a Delaware Limited Partnership

                                      By: Jerusalem Partners IV, L.P.
                                          its General Partner
                                      By: JVP Corp. IV
                                          its General Partner


                                      By:     /s/ Erel Margalit
                                         ----------------------------------------------------
                                             Erel Margalit, Officer

Date:  March 31, 2004

                                      JERUSALEM VENTURE PARTNERS IV-A, L.P.,
                                      a Delaware Limited Partnership

                                      By: Jerusalem Partners IV, L.P.
                                          its General Partner
                                      By: JVP Corp. IV
                                          its General Partner


                                      By:     /s/ Erel Margalit
                                         ----------------------------------------------------
                                             Erel Margalit, Officer

Date:  March 31, 2004

                                      JERUSALEM VENTURE PARTNERS ENTREPRENUERS FUND IV, L.P.,
                                      a Delaware Limited Partnership

                                      By: Jerusalem Partners IV, L.P.
                                          its General Partner
                                      By: JVP Corp. IV
                                          its General Partner


                                      By:     /s/ Erel Margalit
                                         ----------------------------------------------------
                                             Erel Margalit, Officer


                                 Page 22 of 27




Date:  March 31, 2004
                                   
                                      JERUSALEM VENTURE PARTNERS IV (Israel), L.P.,
                                      an Israel Limited Partnership

                                      By: Jerusalem Partners IV-Venture Capital, L.P.
                                          its General Partner
                                      By: JVP Corp. IV
                                          its General Partner


                                      By:     /s/ Erel Margalit
                                         ----------------------------------------------------
                                             Erel Margalit, Officer

Date:  March 31, 2004

                                      JERUSALEM VENTURE PARTNERS III, L.P.,
                                      a Delaware Limited Partnership

                                      By: Jerusalem Partners III, L.P.
                                          its General Partner
                                      By: Jerusalem Venture Partners Corporation
                                          its General Partner


                                      By:     /s/ Erel Margalit
                                         ----------------------------------------------------
                                             Erel Margalit, Officer

Date:  March 31, 2004

                                      JERUSALEM VENTURE PARTNERS ENTREPRENUER FUND III, L.P.,
                                      a Delaware Limited
                                      Partnership

                                      By: Jerusalem Partners III, L.P.
                                          its General Partner
                                      By: Jerusalem Venture Partners Corporation
                                          its General Partner


                                      By:     /s/ Erel Margalit
                                         ----------------------------------------------------
                                             Erel Margalit, Officer



                                 Page 23 of 27




Date:  March 31, 2004
                                   
                                      JERUSALEM VENTURE PARTNERS III (Israel), L.P.,
                                      an Israel Limited Partnership

                                      By: Jerusalem Venture Partners III (Israel)
                                          Management  Company Ltd. its General Partner


                                      By:     /s/ Erel Margalit
                                         ----------------------------------------------------
                                             Erel Margalit, Officer

Date:  March 31, 2004

                                      JERUSALEM PARTNERS IV, L.P.,
                                      a Delaware Limited Partnership

                                      By: JVP Corp. IV
                                          its General Partner


                                      By:     /s/ Erel Margalit
                                         ----------------------------------------------------
                                             Erel Margalit, Officer

Date:  March 31, 2004

                                      JERUSALEM PARTNERS IV- VENTURE CAPITAL, L.P.,
                                      an Israeli Limited Partnership

                                      By: JVP Corp. IV
                                          Its general partner


                                      By:     /s/ Erel Margalit
                                         ----------------------------------------------------
                                             Erel Margalit, Officer

Date:  March 31, 2004

                                      JERUSALEM VENTURE PARTNERS CORPORATION,
                                      a Cayman Islands Corporation


                                      By:     /s/ Erel Margalit
                                         ----------------------------------------------------
                                             Erel Margalit, Officer


                                 Page 24 of 27




Date:  March 31, 2004
                                   
                                      JVP CORP. IV,
                                      a Cayman Island Corporation


                                      By:     /s/ Erel Margalit
                                         ----------------------------------------------------
                                             Erel Margalit, Officer

Date:  March 31, 2004

                                      JERUSALEM VENTURE PARTNERS III (ISRAEL)
                                      MANAGEMENT COMPANY LTD.,
                                      an Israel corporation


                                      By:     /s/ Erel Margalit
                                         ----------------------------------------------------
                                             Erel Margalit, Officer

Date:  March 31, 2004

                                      EREL MARGALIT

                                      By:     /s/ Erel Margalit
                                         ----------------------------------------------------
                                             Erel Margalit



                                 Page 25 of 27


                                INDEX TO EXHIBITS

EXHIBIT A      Agreement of Reporting  Persons,  dated August 4, 2003, among the
               Reporting Persons.

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


                                 Page 26 of 27


                                    Exhibit A

                         Agreement of Reporting Persons


         The  Reporting  Persons have agreed that a single  Schedule 13D (or any
amendment thereto) relating to the Common Stock of Cogent  Communications Group,
Inc. shall be filed on behalf of each of the Reporting Persons. Note that copies
of the applicable agreement are already on file with the appropriate agencies.

                                 Page 27 of 27