SOFTWARE AG SYSTEMS INC
SC 13D/A, 1998-06-30
PREPACKAGED SOFTWARE
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<PAGE>
 
                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549
                                        
                                 SCHEDULE 13D
                   Under the Securities Exchange Act of 1934
                              (Amendment No. 2)*


                           Software AG Systems, Inc.
- --------------------------------------------------------------------------------
                               (Name of Issuer)


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


                                  834025 10 8
- --------------------------------------------------------------------------------
                                (CUSIP Number)


                              Robert B. Ott, Esq.
                                Arnold & Porter
                            555 Twelfth Street, N.W.
                           Washington, DC  20004-1202
                                 (202) 942-5008
- --------------------------------------------------------------------------------
         (Name, Address and Telephone Number of Persons Authorized to
                      Receive Notices and Communications)


                                 June 18, 1998
- --------------------------------------------------------------------------------
            (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 which is the subject of this Schedule 13D, and is filing this
schedule because of (S)(S) 240.13d-1(e), 240.13d-1(f) or 240.13d-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
any subsequent amendment containing information which would alter disclosures
provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
"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).
<PAGE>
 
CUSIP No. 834025108                      13D                       Page  2 of 11

- --------------------------------------------------------------------------------
1)   Name of Reporting Person
     I.R.S. Identification No. of Above Person (entities only)
 
     Thayer Equity Investors III, L.P.
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group:
     (a)  [ x ]
     (b)  [   ]
- --------------------------------------------------------------------------------
3)   SEC Use only
 
- --------------------------------------------------------------------------------
4)   Source of Funds:  00
 
- --------------------------------------------------------------------------------
5)   Check if Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e):    [   ].
 
- --------------------------------------------------------------------------------
6)   Citizenship or Place of Organization:    Delaware
 
- --------------------------------------------------------------------------------
Number of Shares Beneficially owned by Each Reporting Person with:
 
7)   Sole voting Power:                10,736,953
 
- --------------------------------------------------------------------------------
8)   Shared Voting Power                    - 0 -
 
- --------------------------------------------------------------------------------
9)   Sole Dispositive Power:           10,736,953
 
- --------------------------------------------------------------------------------
10)  Shared Dispositive Power:              - 0 -
 
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially
     owned by Each Reporting Person:   10,736,953
 
- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes Certain Shares:    [   ]
 
- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11):                   35.7%
 
- --------------------------------------------------------------------------------
14)  Type of Reporting Person:                                               PN

- --------------------------------------------------------------------------------
<PAGE>
 
CUSIP No. 834025108                      13D                       Page  3 of 11

- --------------------------------------------------------------------------------
1)   Name of Reporting Person
     I.R.S. Identification No. of Above Person (entities only)
 
     TC Equity Partners, L.L.C.
 
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group:
     (a)  [ x ]
     (b)  [   ]
 
- --------------------------------------------------------------------------------
3)   SEC Use only
 
- --------------------------------------------------------------------------------
4)   Source of Funds:  00
 
- --------------------------------------------------------------------------------
5)   Check if Disclosure of Legal Proceedings is
     Required Pursuant to Items 2(d) or 2(e):    [   ].
 
- --------------------------------------------------------------------------------
6)   Citizenship or Place of Organization:   Delaware
 
- --------------------------------------------------------------------------------
Number of Shares Beneficially Owned by Each Reporting Person with:
 
7)   Sole Voting Power:                10,736,953
 
- --------------------------------------------------------------------------------
8)   Shared Voting Power:                   - 0 -
 
- --------------------------------------------------------------------------------
9)   Sole Dispositive Power:           10,736,953
 
- --------------------------------------------------------------------------------
10)  Shared Dispositive Power:              - 0 -
 
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially
     owned by Each Reporting Person:   10,736,953
 
- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes Certain Shares:    [   ]
 
- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11):                   35.7%
 
- --------------------------------------------------------------------------------
14)  Type of Reporting Person:                                              00

- --------------------------------------------------------------------------------
<PAGE>
 
CUSIP No. 834025108                      13D                       Page  4 of 11

- --------------------------------------------------------------------------------
1)   Name of Reporting Person
     I.R.S. Identification No. of Above Person (entities only)
 
     TC Co-Investors, LLC
 
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group:
     (a)  [ x ]
     (b)  [   ]
 
- --------------------------------------------------------------------------------
3)   SEC Use only
 
- --------------------------------------------------------------------------------
4)   Source of Funds:  00
 
- --------------------------------------------------------------------------------
5)   Check if Disclosure of Legal Proceedings is
     Required Pursuant to Items 2(d) or 2(e):     [   ]
 
- --------------------------------------------------------------------------------
6)   Citizenship or Place of organization:  Delaware
 
- --------------------------------------------------------------------------------
Number of Shares Beneficially Owned by Each Reporting Person with:
 
7)   Sole Voting Power:                    58,291
 
- --------------------------------------------------------------------------------
8)   Shared Voting Power:                   - 0 -
 
- --------------------------------------------------------------------------------
9)   Sole Dispositive Power:               58,291
 
- --------------------------------------------------------------------------------
10)  Shared Dispositive Power:              - 0 -
 
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially
     owned by Each Reporting Person:       58,291

- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes certain Shares:    [   ]
 
- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11):                    0.2%
 
- --------------------------------------------------------------------------------
14)  Type of Reporting Person:                                              00

- --------------------------------------------------------------------------------
<PAGE>
 
CUSIP No. 834025108                      13D                       Page  5 of 11

- --------------------------------------------------------------------------------
1)   Name of Reporting Person
     I.R.S. Identification No. of Above Person (entities only)
 
     TC Management Partners, L.L.C.
 
- --------------------------------------------------------------------------------
2)   Check the Appropriate BOX if a Member of a Group:
     (a)  [ x ]
     (b)  [   ]
 
- --------------------------------------------------------------------------------
3)   SEC Use only
 
- --------------------------------------------------------------------------------
4)   Source of Funds:  00
 
- --------------------------------------------------------------------------------
5)   Check if Disclosure of Legal Proceedings is
     Required Pursuant to Items 2(d) or 2(e):    [   ]
 
- --------------------------------------------------------------------------------
6)   Citizenship or Place of organization:  Delaware
 
- --------------------------------------------------------------------------------
Number of Shares Beneficially owned by Each Reporting Person with:
 
7)   Sole Voting Power:                    58,291
 
- --------------------------------------------------------------------------------
8)   Shared Voting Power:                   - 0 -
 
- --------------------------------------------------------------------------------
9)   Sole Dispositive Power:               58,291
 
- --------------------------------------------------------------------------------
10)  Shared Dispositive Power:              - 0 -
 
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially
     owned by Each Reporting Person:       58,291

- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes Certain Shares:    [   ]
 
- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11):                    0.2%
 
- --------------------------------------------------------------------------------
14)  Type of Reporting Person:                                               00

- --------------------------------------------------------------------------------
<PAGE>
 
CUSIP No. 834025108                      13D                       Page  6 of 11

- --------------------------------------------------------------------------------
1)   Name of Reporting Person
     I.R.S. Identification No. of Above Person (entities only)
 
     Carl J. Rickertsen
 
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group:
 
     (a)  [ x ]
     (b)  [   ]
 
- --------------------------------------------------------------------------------
3)   SEC Use only
 
- --------------------------------------------------------------------------------
4)   Source of Funds:    PF. 00
 
- --------------------------------------------------------------------------------
5)   Check if Disclosure of Legal Proceedings is
     Required Pursuant to Items 2(d) or 2(e):    [   ]
 
- --------------------------------------------------------------------------------
6)   Citizenship or Place of organization:   U.S.
 
- --------------------------------------------------------------------------------
Number of Shares Beneficially Owned by Each Reporting Person with:
 
7)   Sole Voting Power:                       8,000
 
- --------------------------------------------------------------------------------
8)   Shared Voting Power                 10,795,244
 
- --------------------------------------------------------------------------------
9)   Sole Dispositive Power:                  8,000
 
- --------------------------------------------------------------------------------
10)  Shared Dispositive Power:           10,795,244
 
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially
     owned by Each Reporting Person:     10,803,244
 
- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes Certain Shares:    [   ]
 
- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11):                   35.9%
 
- --------------------------------------------------------------------------------
14)  Type of Reporting Person:                                              IN

- --------------------------------------------------------------------------------
<PAGE>
 
CUSIP No. 834025108                      13D                       Page  7 of 11

- --------------------------------------------------------------------------------
1)   Name of Reporting Person
     I.R.S. Identification No. of Above Person (entities only)
 
     Paul G. Stern
 
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group:
 
     (a)  [ x ]
     (b)  [   ]
 
- --------------------------------------------------------------------------------
3)   SEC Use only
 
- --------------------------------------------------------------------------------
4)   Source of Funds:   00
 
- --------------------------------------------------------------------------------
5)   Check if Disclosure of Legal Proceedings is
     Required Pursuant to Items 2(d) or 2(e):     [   ].
 
- --------------------------------------------------------------------------------
6)   Citizenship or Place of Organization:  U.S.
 
- --------------------------------------------------------------------------------
Number of Shares Beneficially Owned by Each Reporting Person with:
 
7)   Sole Voting Power:                     - 0 -
 
- --------------------------------------------------------------------------------
8)   Shared Voting Power:              10,795,244
 
- --------------------------------------------------------------------------------
9)   Sole Dispositive Power:                - 0 -
 
- --------------------------------------------------------------------------------
10)  Shared Dispositive Power:         10,795,244
 
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially
     owned by Each Reporting Person:   10,795,244
 
- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes Certain Shares:    [   ]
 
- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11):                   35.9%
 
- --------------------------------------------------------------------------------
14)  Type of Reporting Person:                                               IN

- --------------------------------------------------------------------------------
<PAGE>
 
CUSIP No. 834025108                      13D                       Page  9 of 11

- --------------------------------------------------------------------------------
1)   Name of Reporting Person
     I.R.S. Identification No. of Above Person (entities only)
 
     Frederic V. Malek
 
- --------------------------------------------------------------------------------
2)   Check the Appropriate Box if a Member of a Group:
 
     (a)  [ x ]
     (b)  [   ]
 
- --------------------------------------------------------------------------------
3)   SEC Use only
 
- --------------------------------------------------------------------------------
4)   Source of Funds:  00
 
- --------------------------------------------------------------------------------
5)   Check if Disclosure of Legal Proceedings
     is Required Pursuant to Items 2(d) or 2(e):   [   ]
 
- --------------------------------------------------------------------------------
6)   Citizenship or Place of organization:   U.S.
 
- --------------------------------------------------------------------------------
Number of Shares Beneficially owned by Each Reporting Person with:
 
7)   Sole Voting Power:                     - 0 -
 
- --------------------------------------------------------------------------------
8)   Shared Voting Power:              10,795,244
 
- --------------------------------------------------------------------------------
9)   Sole Dispositive Power:                - 0 -
 
- --------------------------------------------------------------------------------
10)  Shared Dispositive Power:         10,795,244
 
- --------------------------------------------------------------------------------
11)  Aggregate Amount Beneficially
     owned by Each Reporting Person:   10,795,244
 
- --------------------------------------------------------------------------------
12)  Check if the Aggregate Amount in Row (11) Excludes Certain Shares:    [   ]
 
- --------------------------------------------------------------------------------
13)  Percent of Class Represented by Amount in Row (11):                   35.9%
 
- --------------------------------------------------------------------------------
14)  Type of Reporting Person:                                               IN

- --------------------------------------------------------------------------------
<PAGE>
 
CUSIP No. 834025108                      13D                       Page  9 of 11

                        AMENDMENT NO. 1 TO SCHEDULE 13D
                        -------------------------------
                                        
     The Schedule 13D, dated December 2, 1997, of Thayer Equity Investors III,
L.P., TC Equity Partners, L.L.C., TC Co-Investors, LLC, TC Management Partners,
L.L.C., Carl J. Rickertsen, Paul G. Stern and Frederic V. Malek (collectively,
the "Reporting Persons") as amended by Amendment No. 1 thereto (the "Schedule
13D"), is hereby further amended as set forth below.  Capitalized terms used
herein without definition have the meanings set forth in the Schedule 13D.  This
Amendment No. 2 to Schedule 13D supplements and amends the Schedule 13D and
should be read in conjunction with, and is qualified in its entirety by
reference to, the Schedule 13D.


ITEM 5.   INTEREST IN SECURITIES OF THE ISSUER.
          -------------------------------------

          Item 5 of the Schedule 13D is revised and amended and is restated as
set forth below:

          (a)-(b) The aggregate number and percentage of outstanding Shares
beneficially owned by each of the Reporting Persons after the exercise of the
Over-allotment Option are set forth below.  Except as otherwise indicated, each
Reporting Person has the sole power to vote and to dispose of the Shares listed
opposite his or its name.
<PAGE>
 
CUSIP No. 834025108                      13D                       Page 10 of 11

<TABLE>
<CAPTION>
                                                                               
                                  NUMBER OF SHARES      PERCENT OF OUTSTANDING
  NAME OF BENEFICIAL OWNER       BENEFICIALLY OWNED          SHARES OWNED*    
- ----------------------------     ------------------     ----------------------
<S>                              <C>             <C>   
Thayer Equity                                          
  Investors III, L.P.                10,736,953                  35.7%

TC Equity                                                       
  Partners, L.L.C./1/                10,736,953                  35.7%

TC Co-Investors, L.L.C.                  58,291                   0.2%

TC Management                                                   
  Partners, L.L.C./2/                    58,291                   0.2%

Carl J. Rickertsen/3 4/              10,803,244                  35.9%

Paul G. Stern/3/                     10,795,244                  35.9%

Frederic V. Malek/3/                 10,795,244                  35.9%

Reporting Persons                                               
  as a Group                         10,803,244                  35.9%
</TABLE>

          (c)  On June 23, 1998, Thayer and TC Co-Investors sold 814,606 and
4,425 Shares respectively pursuant to the Over-allotment Option at a net price
of $23.04 per share (the "Option Offering").  Except for the Option Offering and
the Secondary Offering, the Reporting Persons did not effect any transactions in
the Shares during the past sixty days.

          (d)  Not Applicable.

          (e)  Not Applicable.
          
- -----------
 *  Based upon the 30,051,217 Shares outstanding as of the close of business on
    June 19, 1998.
/1/ TC Equity is the sole general partner of Thayer and beneficially owns, and
    has sole voting and investment power with respect to, the Shares held of
    record by Thayer .
/2/ TC Management is the managing member of TC Co-Investors and beneficially
    owns, and has sole voting and investment power with respect to, the Shares
    held of record by TC Co-Investors.
/3/ Includes 10,736,953 Shares held of record by Thayer and 58,291 Shares held
    of record by TC Co-Investors. Messrs. Malek and Rickertsen and Dr. Stern are
    the members of TC Management and the principal members of TC Equity and may
    be deemed to be the beneficial owners of, and to have shared voting and
    investment power with respect to, the Shares held of record by each of
    Thayer and TC Co-Investors.
/4/ Consists of (i) 8,000 Shares held of record by Mr. Rickertsen, with respect
    to which Mr. Rickertsen has sole voting and investment power and (ii)
    10,736,953 Shares held of record by Thayer and 58,291 Shares held of record
    by TC Co-Investors, with respect to which Mr. Rickertsen has shared voting
    and investment power.

<PAGE>
 
CUSIP No. 834025108                      13D                       Page 11 of 11

SIGNATURES

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


          Dated.  June 29, 1998


<TABLE>
<S>                                      <C>
THAYER EQUITY INVESTORS, III, L.P.       TC CO-INVESTORS, LLC
 
By:  TC Equity Partners, L.L.C.          By:  TC Management Partners, L.L.C.
       its General Partner                      its Managing Member
 
       By: /s/ Carl J. Rickertsen               By: /s/ Carl J. Rickertsen
          ----------------------------             -----------------------------
          Carl J. Rickertsen                       Carl J. Rickertsen
          Member                                   Member
 
 
TC EQUITY PARTNERS, L.L.C.               TC MANAGEMENT PARTNERS, L.L.C.
 
       By: /s/ Carl J. Rickertsen               By: /s/ Carl J. Rickertsen
          ----------------------------             -----------------------------
          Carl J. Rickertsen                       Carl J. Rickertsen
          Member                                   Member
 
 
       By: /s/ Carl J. Rickertsen               By:              *
          ----------------------------             -----------------------------
          Carl J. Rickertsen                       Paul G. Stern
 
 
       By:              *
          -----------------------------
          Frederic V. Malek


       By: /s/ Carl J. Rickertsen
          -----------------------------
          Carl J. Rickertsen
          Attorney-in-fact
</TABLE> 


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