GREYLOCK IX LP
SC 13G, 2000-02-14
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<PAGE>   1



                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13G


                    Under the Securities Exchange Act of 1934

                                (Amendment No. )*


                      Northpoint Communications Group, Inc.
                                (Name of Issuer)

                     Common Stock, $.001 par value per share
                         (Title of Class of Securities)

                                   666610 10 0
                                 (CUSIP Number)



             (Date of Event Which Requires Filing of this Statement)

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

         / /     Rule 13d-1(b)

         / /     Rule 13d-1(c)

         /X/     Rule 13d-1(d)

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

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


POTENTIAL PERSONS WHO ARE TO RESPOND TO THE COLLECTION OF INFORMATION CONTAINED
IN THIS FORM ARE NOT REQUIRED TO RESPOND UNLESS THE FORM DISPLAYS A CURRENTLY
VALID OMB CONTROL NUMBER.
<PAGE>   2
CUSIP No. 666610 10 0

 ...............................................................................

1.   Names of Reporting Persons.
     I.R.S. Identification Nos. of above persons (entities only).
     Greylock IX Limited Partnership
 ...............................................................................

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

2.   Check the Appropriate Box if a Member of a Group (See Instructions)

     (a).......................................................................

     (b).......................................................................
- -------------------------------------------------------------------------------

3.   SEC Use Only..............................................................
- -------------------------------------------------------------------------------

4.   Citizenship or Place of Organization..............................Delaware
- -------------------------------------------------------------------------------

Number of Shares            5.   Sole Voting Power..................-7,999,727-
Beneficially Owned by       ---------------------------------------------------
Each Reporting Person
With:                       6.   Shared Voting Power........................-0-
                            ---------------------------------------------------

                            7.   Sole Dispositive Power.............-7,999,727-
                            ---------------------------------------------------

                            8.   Shared Dispositive Power...................-0-
- -------------------------------------------------------------------------------

9.   Aggregate Amount Beneficially Owned by Each Reporting Person...-7,999,727-
- -------------------------------------------------------------------------------

10.  Check if the Aggregate Amount in Row (9) Excludes
     Certain Shares (See Instructions).........................................
- -------------------------------------------------------------------------------

11.  Percent of Class Represented by Amount in Row (9).....................6.4%
- -------------------------------------------------------------------------------

12.  Type of Reporting Person (See Instructions).............................PN
- -------------------------------------------------------------------------------


                               Page 2 of 8 pages
<PAGE>   3
CUSIP No. 666610 10 0

 ...............................................................................

1.   Names of Reporting Persons.
     I.R.S. Identification Nos. of above persons (entities only).
     Greylock IX GP Limited Partnership
 ...............................................................................

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

2.   Check the Appropriate Box if a Member of a Group (See Instructions)

     (a).......................................................................

     (b).......................................................................
- -------------------------------------------------------------------------------

3.   SEC Use Only..............................................................
- -------------------------------------------------------------------------------

4.   Citizenship or Place of Organization..............................Delaware
- -------------------------------------------------------------------------------

Number of Shares            5.   Sole Voting Power..................-7,999,727-
Beneficially Owned by       ---------------------------------------------------
Each Reporting Person
With:                       6.   Shared Voting Power........................-0-
                            ---------------------------------------------------

                            7.   Sole Dispositive Power.............-7,999,727-
                            ---------------------------------------------------

                            8.   Shared Dispositive Power...................-0-
- -------------------------------------------------------------------------------

9.   Aggregate Amount Beneficially Owned by Each Reporting Person...-7,999,727-
- -------------------------------------------------------------------------------

10.  Check if the Aggregate Amount in Row (9) Excludes
     Certain Shares (See Instructions).........................................
- -------------------------------------------------------------------------------

11.  Percent of Class Represented by Amount in Row (9).....................6.4%
- -------------------------------------------------------------------------------

12.  Type of Reporting Person (See Instructions).............................PN
- -------------------------------------------------------------------------------


                               Page 3 of 8 pages
<PAGE>   4
CUSIP No. 666610 10 0



 ...............................................................................

1.   Names of Reporting Persons.
     I.R.S. Identification Nos. of above persons (entities only).
     William W. Helman
 ...............................................................................

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

2.   Check the Appropriate Box if a Member of a Group (See Instructions)

     (a).......................................................................

     (b).......................................................................
- -------------------------------------------------------------------------------

3.   SEC Use Only..............................................................
- -------------------------------------------------------------------------------

4.   Citizenship or Place of Organization.........................United States
- -------------------------------------------------------------------------------

Number of Shares            5.   Sole Voting Power....................-156,384-
Beneficially Owned by       ---------------------------------------------------
Each Reporting Person
With:                       6.   Shared Voting Power................-7,999,727-
                            ---------------------------------------------------

                            7.   Sole Dispositive Power...............-156,384-
                            ---------------------------------------------------

                            8.   Shared Dispositive Power...........-7,999,727-
- -------------------------------------------------------------------------------

9.   Aggregate Amount Beneficially Owned by Each Reporting Person...-8,156,111-
- -------------------------------------------------------------------------------

10.  Check if the Aggregate Amount in Row (9) Excludes
     Certain Shares (See Instructions).........................................
- -------------------------------------------------------------------------------

11.  Percent of Class Represented by Amount in Row (9).....................6.5%
- -------------------------------------------------------------------------------

12.  Type of Reporting Person (See Instructions).............................IN
- -------------------------------------------------------------------------------


                               Page 4 of 8 pages
<PAGE>   5
CUSIP No. 666610 10 0

 ...............................................................................

1.   Names of Reporting Persons.
     I.R.S. Identification Nos. of above persons (entities only).
     William S. Kaiser
 ...............................................................................

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

2.   Check the Appropriate Box if a Member of a Group (See Instructions)

     (a).......................................................................

     (b).......................................................................
- -------------------------------------------------------------------------------

3.   SEC Use Only..............................................................
- -------------------------------------------------------------------------------

4.   Citizenship or Place of Organization.........................United States
- -------------------------------------------------------------------------------

Number of Shares            5.   Sole Voting Power....................-156,384-
Beneficially Owned by       ---------------------------------------------------
Each Reporting Person
With:                       6.   Shared Voting Power................-7,999,727-
                            ---------------------------------------------------

                            7.   Sole Dispositive Power...............-156,384-
                            ---------------------------------------------------

                            8.   Shared Dispositive Power...........-7,999,727-
- -------------------------------------------------------------------------------

9.   Aggregate Amount Beneficially Owned by Each Reporting Person...-8,156,111-
- -------------------------------------------------------------------------------

10.  Check if the Aggregate Amount in Row (9) Excludes
     Certain Shares (See Instructions).........................................
- -------------------------------------------------------------------------------

11.  Percent of Class Represented by Amount in Row (9).....................6.5%
- -------------------------------------------------------------------------------

12.  Type of Reporting Person (See Instructions).............................IN
- -------------------------------------------------------------------------------


                               Page 5 of 8 pages
<PAGE>   6
CUSIP No. 666610 10 0

Item 1(a)                  Name of Issuer:

                           Northpoint Communications Group, Inc.


Item 1(b)                  Address of Issuer's Principal Executive Offices:

                           303 2nd Street
                           San Francisco, CA  94107

Item 2(a)                  Name of Person Filing:

                           Greylock Equity Limited Partnership ("GIXLP");
                           Greylock Equity GP Limited Partnership ("GIXGPLP"),
                           the General Partner of GIXLP; William W. Helman and
                           William S. Kaiser, each Co-Managing General Partners
                           of GIXGPLP (each a "Co-Managing Partner").


Item 2(b)                  Address of Principal Business Office or, if none,
                           Residence:

                           The address of the reporting persons is:

                           One Federal Street
                           Boston, Massachusetts  02110


Item 2(c)                  Citizenship:

                           GIXLP is a limited partnership organized under the
                           laws of the State of Delaware. GIXGPLP is a limited
                           partnership organized under the laws of the State of
                           Delaware. Each of Mr. Helman and Mr. Kaiser is a
                           citizen of the United States.


Item 2(d)                  Title of Class of Securities:

                           Common Stock, par value $.001 per share (the "Common
                           Stock").


Item 2(e)                  CUSIP Number:

                           666610 10 0


Item 3                     Description of Person Filing:

                           Not applicable.


Item 4                     Ownership(1):

                           (a) Amount Beneficially Owned:

                                    GIXLP is the record holder of 7,999,727
                                    shares of Common Stock and may be deemed to
                                    beneficially own the 7,999,727 shares of
                                    Common Stock held of record by GIXLP.
                                    GIXGPLP, as General Partner of GIXLP, may be
                                    deemed to beneficially own the 7,999,727
                                    shares of Common Stock held of record by
                                    GIXLP. Each of Mr. Helman and Mr.

- --------
(1)      As of December 31, 1999.



                               Page 6 of 8 pages
<PAGE>   7
CUSIP No. 666610 10 0

                                    Kaiser, each as Co-Managing General Partner
                                    of GIXGPLP, may be deemed to beneficially
                                    own the 7,999,727 shares of Common Stock
                                    held of record by GIXLP. Each of Mr. Helman
                                    and Mr. Kaiser may be deemed to beneficially
                                    own an additional 156,384 shares of Common
                                    Stock. The filing of this statement shall
                                    not be construed as an admission that any of
                                    the reporting persons are, for the purpose
                                    of Section 13(d) or 13(g) of the Act, the
                                    beneficial owners of any securities covered
                                    under this statement.

                           (b) Percent of Class:

                                    GIXLP:                             6.4%
                                    GIXGPLP:                           6.4%
                                    Mr. Helman:                        6.5%
                                    Mr. Kaiser:                        6.5%

                           (c) Number of Shares as to which the person has:

                                    (i) sole voting power; (ii) shared voting
                                    power; (iii) sole dispositive power; (iv)
                                    shared dispositive power:

                                    GIXLP may be deemed to have sole power to
                                    vote and dispose of 7,999,727 shares of
                                    Common Stock. GIXGPLP, as General Partner of
                                    GIXLP, may be deemed to have sole power to
                                    vote and dispose of 7,999,727 shares of
                                    Common Stock. Each of Mr. Helman and Mr.
                                    Kaiser, as Co-Managing General Partner of
                                    GIXGPLP, may be deemed to have sole power to
                                    vote 7,999,727 shares of Common Stock. Each
                                    of Mr. Helman and Mr. Kaiser may be deemed
                                    to have power to vote and dispose of an
                                    additional 156,384 shares of Common Stock.


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

                           Not applicable.


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

                           Not applicable.


Item 7                     Identification and Classification of the Subsidiary
                           Which Acquired the Security Being Reported on By the
                           Parent Holding Company:


                           Not applicable.


Item 8                     Identification and Classification of Members of the
                           Group:

                           Not applicable.


Item 9                     Notice of Dissolution of Group:

                           Not applicable.


Item 10                    Certification:

                           Not applicable.



                               Page 7 of 8 pages
<PAGE>   8
CUSIP No. 666610 10 0

                                    SIGNATURE

         After reasonable inquiry and to the best of the knowledge and belief of
each of the undersigned, each of the undersigned hereby certifies that the
information set forth in this statement is true, complete and correct.

DATED:  February 11, 2000


                                   GREYLOCK IX LIMITED PARTNERSHIP

                                   By:  Greylock IX GP Limited Partnership
                                        General Partner


                                        By: /s/ William W. Helman
                                            -----------------------------------
                                            William W. Helman
                                            Co-Managing General Partner


                                   GREYLOCK IX GP LIMITED PARTNERSHIP


                                   By:      /s/ William W. Helman
                                        ---------------------------------------
                                        William W. Helman
                                        Co-Managing General Partner



                                            /s/ William W. Helman
                                   --------------------------------------------
                                   William W. Helman



                                            /s/ William S. Kaiser
                                   --------------------------------------------
                                   William S. Kaiser


                               Page 8 of 8 pages

<PAGE>   1
CUSIP No. 666610 10 0


                                                                       Exhibit I

                                    AGREEMENT

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

         EXECUTED as a sealed instrument this 11th day of February, 2000.


                                   GREYLOCK IX LIMITED PARTNERSHIP

                                        By:  Greylock IX GP Limited Partnership
                                             General Partner



                                        By: /s/ William W. Helman
                                            -----------------------------------
                                            William W. Helman
                                            Co-Managing General Partner


                                   GREYLOCK IX GP LIMITED PARTNERSHIP


                                   By:      /s/ William W. Helman
                                        ---------------------------------------
                                        William W. Helman
                                        Co-Managing General Partner



                                            /s/ William W. Helman
                                   --------------------------------------------
                                   William W. Helman



                                            /s/ William S. Kaiser
                                   --------------------------------------------
                                   William S. Kaiser




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