GENSYM CORP
SC 13G, 1997-02-14
PREPACKAGED SOFTWARE
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<PAGE>   1

                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

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

                                  SCHEDULE 13G

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934

                            (Amendment No.       )*
                                
                              Gensym Corporation
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                    Common Stock, $.01 par value per share
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)



                                 37245R 10 7
                          ----------------------------
                                 (CUSIP Number)


     * 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).


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- ---------------------------                         ---------------------------
  CUSIP No.  759924 10 3              13G                 Page  2  of  5  
             -----------                                       ---    ---
- ---------------------------                         ---------------------------


                                  SCHEDULE 13G

- --------------------------------------------------------------------------------
1.     NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

       Robert L. Moore  
- --------------------------------------------------------------------------------
2.     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP 
                                                                (a)  / /
                                                                (b)  / /
- --------------------------------------------------------------------------------
3.     SEC USE ONLY


- --------------------------------------------------------------------------------
4.     CITIZENSHIP OR PLACE OF ORGANIZATION

       United States
- --------------------------------------------------------------------------------
                          5.       SOLE VOTING POWER                           
                                                                               
                                   335,000                                    
        NUMBER OF         ------------------------------------------------------
         SHARES           6.       SHARED VOTING POWER                          
      BENEFICIALLY                                                              
         OWNED BY                  0                               
          EACH            ------------------------------------------------------
       REPORTING          7.       SOLE DISPOSITIVE POWER                       
         PERSON                                                                 
          WITH:                    335,000                                
                          ------------------------------------------------------
                          8.       SHARED DISPOSITIVE POWER                     
                                                                                
                                   0                                
- --------------------------------------------------------------------------------
9.     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON.

       335,000                
- -------------------------------------------------------------------------------
10.    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES. [ ]

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

       5.4%
- --------------------------------------------------------------------------------
12.    TYPE OF REPORTING PERSON.

       IN
- --------------------------------------------------------------------------------



<PAGE>   3
- ---------------------------                         ---------------------------
  CUSIP No.  759924 10 3              13G                 Page  3  of  5  
             -----------                                       ---    ---
- ---------------------------                         ---------------------------
                                        
                                 SCHEDULE 13G


Item 1(a).  Name of Issuer:
            ---------------

            Gensym Corporation

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

            125 CambridgePark Drive
            Cambridge, MA  02140

Item 2(a).  Name of Person Filing:
            ----------------------

            Robert L. Moore

Item 2(b).  Address of Principal Business Office or, if None, Residence:
            ------------------------------------------------------------

            125 CambridgePark Drive
            Cambridge, MA  02140

Item 2(c).  Citizenship:
            ------------

            United States

Item 2(d).  Title of Class of Securities:
            -----------------------------

            Common Stock, $.01 par value per share

Item 2(e).  CUSIP Number:
            -------------

            37245R 10 7

Item 3.     If this statement is filed pursuant to Rules 13d-1(b), or
            ---------------------------------------------------------
            13d-2(b), check whether the person filing is a:
            -----------------------------------------------

            Not Applicable

Item 4.     Ownership
                
            (a) Amount Beneficially Owned:

            335,000


<PAGE>   4
- ---------------------------                         ---------------------------
  CUSIP No.  759924 10 3              13G                 Page  4  of  5  
             -----------                                       ---    ---
- ---------------------------                         ---------------------------



         (b) Percent of Class:

               5.4%

         (c) Number of shares as to which such person has:

               (i)      sole power to vote or to direct the vote:

                        335,000

               (ii)     shared power to vote or to direct the vote:

                        0

               (iii)    sole power to dispose or to direct the
                        disposition of:

                        335,000

               (iv)     shared power to dispose or to direct the
                        disposition of:

                        0

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


<PAGE>   5

- ---------------------------                         ---------------------------
  CUSIP No.  759924 10 3              13G                 Page  5  of  5  
             -----------                                       ---    ---
- ---------------------------                         ---------------------------



Item 7.     Identification And Classification of the Subsidiary which Acquired
            ------------------------------------------------------------------
the Security Being Reported 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:
            --------------
            By signing below I certify that, to the best of my knowledge and
            belief, the securities referred to above were acquired in the
            ordinary course of business and were not acquired for the purpose
            of and do not have the effect of changing or influencing the
            control of the issuer of such securities and were not acquired in
            connection with or as a participant in any transaction having
            such purposes or effect.
        
        
                                    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. 


                                                        February 13, 1997
                                                  ------------------------------
                                                        Date


                                                     /s/Robert L. Moore 
                                                  ------------------------------
                                                         Signature


                                                         Robert L. Moore
                                                  ------------------------------
                                                         Name/Title




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