GREYLOCK EQUITY LP
SC 13G, 1999-02-12
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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. )*


                                 ISS GROUP, INC.
- --------------------------------------------------------------------------------
                                (Name of issuer)

                     COMMON STOCK, $.001 par value per share
- --------------------------------------------------------------------------------
                         (Title of class of securities)

                                  450306 10 5
- --------------------------------------------------------------------------------
                                 (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)

                       (Continued on the following pages)

                              (Page 1 of 9 Pages)

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

*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, se 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. 450306 10 5             SCHEDULE 13G        Page  2 of  9 Pages
- --------------------------------------------------------------------------------
1.      NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

        Greylock Equity 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
- --------------------------------------------------------------------------------
                         5.      SOLE VOTING POWER  

                                 1,604,462
 NUMBER OF               -------------------------------------------------------
   SHARES                6.      SHARED VOTING POWER
BENEFICIALLY 
  OWNED BY                       0
   EACH                  -------------------------------------------------------
 REPORTING               7.      SOLE DISPOSITIVE POWER
  PERSON      
   WITH:                         1,604,462
                         -------------------------------------------------------
                         8.      SHARED DISPOSITIVE POWER  

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

        1,604,462
- --------------------------------------------------------------------------------
10.     CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES 
        (SEE INSTRUCTIONS)                                                  [ ]
- --------------------------------------------------------------------------------
11.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)    
        9.41%
- --------------------------------------------------------------------------------
12.     TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)  

        PN
================================================================================



<PAGE>   3

- ----------------------------                           ------------------------
  CUSIP No. 450306 10 5             SCHEDULE 13G        Page  3 of  9 Pages
- --------------------------------------------------------------------------------
1.       NAMES OF REPORTING PERSONS
         I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

         Greylock Equity 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
- --------------------------------------------------------------------------------
                        5.      SOLE VOTING POWER  

                                 1,604,462
 NUMBER OF               -------------------------------------------------------
   SHARES                6.      SHARED VOTING POWER
BENEFICIALLY 
  OWNED BY                       0
   EACH                  -------------------------------------------------------
 REPORTING               7.      SOLE DISPOSITIVE POWER
  PERSON      
   WITH:                         1,604,462
                         -------------------------------------------------------
                         8.      SHARED DISPOSITIVE POWER  

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

         1,604,462
- --------------------------------------------------------------------------------
10.      CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES 
         (SEE INSTRUCTIONS)                                                 [ ]
- --------------------------------------------------------------------------------
11.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)    
         9.41%
- --------------------------------------------------------------------------------
12.      TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)   
 
         PN
================================================================================

<PAGE>   4

- ----------------------------                           ------------------------
  CUSIP No. 450306 10 5             SCHEDULE 13G        Page  4 of  9 Pages
- --------------------------------------------------------------------------------
1.      NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

        Henry F. McCance
- --------------------------------------------------------------------------------
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
- --------------------------------------------------------------------------------
                         5.  SOLE VOTING POWER  

                             1,636,865
 NUMBER OF               -------------------------------------------------------
   SHARES                6.  SHARED VOTING POWER
BENEFICIALLY 
  OWNED BY                   0
   EACH                  -------------------------------------------------------
 REPORTING               7.  SOLE DISPOSITIVE POWER
  PERSON      
   WITH:                     32,403
                         -------------------------------------------------------
                         8.  SHARED DISPOSITIVE POWER  

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

        1,650,258
- --------------------------------------------------------------------------------
10.     CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES 
        (SEE INSTRUCTIONS)                                                  [ ]
- --------------------------------------------------------------------------------
11.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 
        9.68%
- --------------------------------------------------------------------------------
12.     TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) 

        IN
================================================================================


<PAGE>   5

ITEM 1(a)       NAME OF ISSUER:

                ISS Group, Inc.

ITEM 1(b)       ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

                6600 Peachtree-Dunwoody Road
                300 Embassy Row, Suite 500
                Atlanta, GA  30328

ITEM 2(a)       NAME OF PERSON FILING:

                Greylock Equity Limited Partnership ("GELP");
                Greylock Equity GP Limited Partnership ("GEGPLP"),
                the General Partner of GELP; Henry F. McCance, the
                Managing General Partner of GEGPLP ("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:

                GELP is a limited partnership organized under the laws of the 
                State of Delaware. GEGPLP is a limited partnership organized 
                under the laws of the State of Delaware. Mr. McCance 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:

                450306 10 5

ITEM 3          DESCRIPTION OF PERSON FILING:

                Not applicable.

ITEM 4          OWNERSHIP(1):

                (a)      AMOUNT BENEFICIALLY OWNED:

                         GELP is the record holder of 1,604,462
                         shares of Common Stock and may be deemed to
                         beneficially own the 1,604,462 shares of
                         Common Stock held of record by GELP. GEGPLP,
                         as General Partner of 

- -----------------
(1) As of December 31, 1998.


                               Page 5 of 9 pages
<PAGE>   6

                         GELP, may be deemed to beneficially own the 1,604,462
                         shares of Common Stock held of record by GELP. Mr.
                         McCance, as Managing General Partner of GEGPLP, may be
                         deemed to beneficially own the 1,604,462 shares of
                         Common Stock held of record by GELP. Mr. McCance may be
                         deemed to beneficially own an additional 45,796 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:

                         GELP:                              9.41%
                         GEGPLP:                            9.41%
                         Mr. McCance:                       9.68%

                (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:

                         GELP may be deemed to have sole power to vote and
                         dispose of 1,604,462 shares of Common Stock. GEGPLP, as
                         General Partner of GELP, may be deemed to have sole
                         power to vote and dispose of 1,604,462 shares of Common
                         Stock. Mr. McCance, as Managing General Partner of
                         GEGPLP, may be deemed to have sole power to vote
                         1,604,462 shares of Common Stock. Mr. McCance may be
                         deemed to have power to vote and dispose of an
                         additional 32,403 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.

                              Page 6 of 9 pages


<PAGE>   7


ITEM 10         CERTIFICATION:

                Not applicable.

                               Page 7 of 9 pages


<PAGE>   8

                                    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, 1999


                                        GREYLOCK EQUITY LIMITED PARTNERSHIP


                                        By: Greylock Equity GP Limited
                                            Partnership General Partner


                                             By: /s/ Henry F. McCance
                                                --------------------------------
                                                Henry F. McCance
                                                Managing General Partner



                                        GREYLOCK EQUITY GP LIMITED PARTNERSHIP


                                        By: /s/ Henry F. McCance
                                           -------------------------------------
                                           Henry F. McCance
                                           Managing General Partner

                                         /s/ Henry F. McCance
                                        ----------------------------------------
                                        Henry F. McCance



                               Page 8 of 9 pages



<PAGE>   1



                                                                       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 ISS Group, Inc.


     EXECUTED as a sealed instrument this 11th day of February, 1999.


                                       GREYLOCK EQUITY LIMITED PARTNERSHIP

                                       By: Greylock Equity GP Limited 
                                           Partnership General Partner


                                       By: /s/ Henry F. McCance
                                          --------------------------------------
                                          Henry F. McCance
                                          Managing General Partner



                                       GREYLOCK EQUITY GP LIMITED PARTNERSHIP


                                       By: /s/ Henry F. McCance
                                          --------------------------------------
                                          Henry F. McCance
                                          Managing General Partner


                                        /s/ Henry F. McCance
                                       -----------------------------------------
                                       Henry F. McCance

                              
stahl/39429105/13G99/iss.wpf


                                Page 9 of 9 pages







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