- OMB APPROVAL - --------------------------------------------- OMB Number: 3235-0145 Expires: 31-Aug-02 Estimated Average burden hours per response - --------------------------------------------- UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO. _________)* Ansys, Inc. (Name of Issuer) Common Stock Par Value $.01 (Title of Class of Securities) 03662Q 10 5 (CUSIP Number) Check the following box if a fee is being paid with this statement / /. (A fee is not required only if the filing person: (1) has a previous statement on file reporting beneficial ownership of more than five percent of the class of securities described in Item 1; and (2) has filed no amendment subsequent thereto reporting beneficial ownership of five percent or less of such class.) (See Rule 13d-7). *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). SEC 1745(10-88) Page 1

- -------------------------- --------------------- CUSIP NO. 03662Q 10 5 13G PAGE 2 - ------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S IDENTIFICATION NO. OF ABOVE PERSON Advent VII L.P. 04-3181563 Advent Industrial II L.P. 51-0314268 Advent New York L.P. 04-3095408 Advent Atlantic and Pacific II L.P. 04-3123521 TA Venture Investors L.P. 04-3068354 TA Associates VII L.P. 04-3181563 TA Associates Inc. 04-3205751 TA Associates Service Corporation 04-3214469 - -------------------------------------------------------------------------------- 2 CHECK THE BOX IF A MEMBER OF A GROUP* (a) [X] (b) [ ] - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Advent VII L.P. Delaware Advent Industrial II L.P. Delaware Advent New York L.P. Delaware Advent Atlantic and Pacific II L.P. Delaware TA Venture Investors L.P. Massachusetts TA Associates VII L.P. Delaware TA Associates Inc. Delaware TA Associates Service Corporation Massachusetts - -------------------------------------------------------------------------------- 5 SOLE VOTING POWER Advent VII L.P. 0 Advent Industrial II L.P. 0 NUMBER OF Advent New York L.P. 0 Advent Atlantic and Pacific II L.P. 0 SHARES TA Venture Investors L.P. 0 TA Associates VII L.P. 0 BENEFICIALLY TA Associates Inc. 0 TA Associates Service Corporation 0 OWNED BY ------------------------------------------------------- 6 SHARED VOTING POWER EACH N/A REPORTING ------------------------------------------------------ 7 SOLE DISPOSITIVE POWER PERSON Advent VII L.P. 0 WITH Advent Industrial II L.P. 0 Advent New York L.P. 0 Advent Atlantic and Pacific II L.P. 0 TA Venture Investors L.P. 0 TA Associates VII L.P. 0 TA Associates Inc. 0 TA Associates Service Corporation 0 ------------------------------------------------------- 8 SHARED DISPOSITIVE POWER N/A - ------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON Advent VII L.P. 0 Advent Industrial II L.P. 0 Advent New York L.P. 0 Advent Atlantic and Pacific II L.P. 0 TA Venture Investors L.P. 0 TA Associates VII L.P. 0 TA Associates Inc. 0 TA Associates Service Corporation 0 - ------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* - ------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 Advent VII L.P. 0% Advent Industrial II L.P. 0% Advent New York L.P. 0% Advent Atlantic and Pacific II L.P. 0% TA Venture Investors L.P. 0% TA Associates VII L.P. 0% TA Associates Inc. 0% TA Associates Service Corporation 0% - ------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON Each entity is a Limited Partnership, except for TA Associates, Inc. and TA Associates Service Corporation which are Corporations. ================================================================================ SEE INSTRUCTION BEFORE FILLING OUT!

ATTACHMENT TO FORM 13G PAGE 3 ITEM 1 (a) NAME OF ISSUER: Ansys, Inc. ITEM 1 (b) ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES: P.O. Box 65 Houston, PA 15342 ITEM 2 (a) NAME OF PERSON FILING: Advent VII L.P. Advent Industrial II L.P Advent New York L.P. Advent Atlantic and Pacific II L.P. TA Venture Investors L.P. TA Associates VII L.P. TA Associates Inc. TA Associates Service Corporation ITEM 2 (b) ADDRESS OF PRINCIPAL BUSINESS OFFICE: c/o TA Associates 125 High Street, Suite 2500 Boston, MA 02110 ITEM 2 (c) CITIZENSHIP: Not Applicable ITEM 2 (d) TITLE AND CLASS OF SECURITIES: Common ITEM 2 (e) CUSIP NUMBER: 03662Q 10 5 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 ITEM 4 (a) AMOUNT BENEFICIALLY OWNED: COMMON STOCK ------------ Advent VII L.P. 0 Advent Industrial II L.P. 0 Advent New York L.P. 0 Advent Atlantic and Pacific II L.P. 0 TA Venture Investors L.P. 0 TA Associates VII L.P. 0 TA Associates Inc. 0 TA Associates Service Corporation 0 ITEM 4 (b) PERCENT OF CLASS PERCENTAGE ---------- Advent VII L.P. 0% Advent Industrial II L.P. 0% Advent New York L.P. 0% Advent Atlantic and Pacific II L.P. 0% TA Venture Investors L.P. 0% TA Associates VII L.P. 0% TA Associates Inc. 0% TA Associates Service Corporation 0% ITEM 4 (c) NUMBER OF SHARES AS TO WHICH SUCH PERSON HAS: (i) SOLE POWER TO VOTE OR DIRECT THE VOTE: COMMON STOCK ------------ Advent VII L.P. 0 Advent Industrial II L.P. 0 Advent New York L.P. 0 Advent Atlantic and Pacific II L.P. 0 TA Venture Investors L.P. 0 TA Associates VII L.P. 0 TA Associates Inc. 0 TA Associates Service Corporation 0 (ii) SHARED POWER TO VOTE OR DIRECT THE VOTE: N/A (iii) SOLE POWER TO DISPOSE OR DIRECT THE DISPOSITION: COMMON STOCK ------------ Advent VII L.P. 0 Advent Industrial II L.P. 0 Advent New York L.P. 0 Advent Atlantic and Pacific II L.P. 0 TA Venture Investors L.P. 0 TA Associates VII L.P. 0 TA Associates Inc. 0 TA Associates Service Corporation 0 (iv) SHARED POWER TO DISPOSE OR DIRECT THE DISPOSITION N/A

PAGE 4 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 THAT ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY: Not Applicable ITEM 8 IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP: This schedule 13G is filed pursuant to Rule 13d-1 (c). For the agreement of group members to a joint filing, see below. ITEM 9 NOTICE OF DISSOLUTION OF GROUP: Not Applicable ITEM 10 CERTIFICATION: Not Applicable

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. 2/7/02 ------------------------- Date /s/ Thomas P. Alber ------------------------- Signature Chief Financial Officer ------------------------- Name/Title

AGREEMENT FOR JOINT FILING Advent VII L.P., Advent Industrial II L.P., Advent New York L.P., Advent Atlantic and Pacific II L.P., TA Venture Investors Limited Partnership, TA Associates VII L.P., TA Associates Inc. and TA Associates Service Corporation, hereby agree that TA Associates shall file with the Securities and Exchange Commission a joint schedule 13G on behalf of the above-named parties concerning their beneficial ownership of Ansys, Inc. Dated: ADVENT VII L.P. By: TA Associates VII L.P., its General Partner By: TA Associates, Inc. its General Partner By: ----------------------------------------------- Thomas P. Alber, Chief Financial Officer ADVENT INDUSTRIAL II L.P. By: TA Associates VI L.P., its General Partner By: TA Associates, Inc. its General Partner By: ----------------------------------------------- Thomas P. Alber, Chief Financial Officer ADVENT ATLANTIC AND PACIFIC II L.P. By: TA Associates AAP II Partners L.P., its General Partner By: TA Associates, Inc. its General Partner By: ----------------------------------------------- Thomas P. Alber, Chief Financial Officer ADVENT NEW YORK L.P. By: TA Associates VI L.P., its General Partner By: TA Associates, Inc. its General Partner By: ----------------------------------------------- Thomas P. Alber, Chief Financial Officer TA VENTURE INVESTORS L.P. By: ----------------------------------------------- Thomas P. Alber, Chief Financial Officer TA ASSOCIATES VII L.P. By: TA Associates Inc., its General Partner By: ----------------------------------------------- Thomas P. Alber, Chief Financial Officer TA ASSOCIATES, INC. By: ----------------------------------------------- Thomas P. Alber, Chief Financial Officer TA ASSOCIATES SERVICE CORPORATION By: ----------------------------------------------- Thomas P. Alber, Clerk