1 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). (Continued on following page(s)) Page 1 of 4 Pages SEC 1745 (10-85)

2 CUSIP NO. 036622 10 5 13G PAGE 2 OF 4 PAGES - -------------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING 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 Limited Partnership 04-3068354 - -------------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE 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 Limited Partnership Massachusetts - -------------------------------------------------------------------------------------------------------------- 5 SOLE VOTING POWER Advent VII L.P. 4,727,986 Advent Industrial II L.P. 346,405 Advent New York L.P. 472,799 Advent Atlantic and Pacific II L.P. 960,841 TA Venture Investors Limited Partnership 99,288 NUMBER OF SHARES ----------------------------------------------------------------------------------------- BENEFICIALLY 6 SHARED VOTING POWER OWNED BY EACH N/A REPORTING ----------------------------------------------------------------------------------------- PERSON 7 SOLE DISPOSITIVE POWER WITH Advent VII L.P. 4,727,986 Advent Industrial II L.P. 346,405 Advent New York L.P. 472,799 Advent Atlantic and Pacific II L.P. 960,841 TA Venture Investors Limited Partnership 99,288 ------------------------------------------------------------------------------------------ 8 SHARED DISPOSITIVE POWER N/A - --------------------------------------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON Advent VII L.P. 4,727,986 Advent Industrial II L.P. 346,405 Advent New York L.P. 472,799 Advent Atlantic and Pacific II L.P. 960,841 TA Venture Investors Limited Partnership 99,288 - --------------------------------------------------------------------------------------------------------------- 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. 29.13 Advent Industrial II L.P. 2.13 Advent New York L.P. 2.91 Advent Atlantic and Pacific II L.P. 5.92 TA Venture Investors Limited Partnership .61 - -------------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON Each entity is a Limited Partnership - -------------------------------------------------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT!

3 SCHEDULE 13G Page 3 of 4 Pages Item 1: (a) Name of Issuer: ANSYS, Inc. (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 Limited Partnership (b) Address of Principal Business Office: c/o TA Associates 125 High Street, Suite 2500 Boston, MA 02110 (c) Citizenship: Not Applicable (d) Title of Class of Securities: Common Stock, Par Value $.01 (e) CUSIP Number: 036620 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 (a) Amount Beneficially Owned: Common Stock ------------ Advent VII L.P. 4,727,986 Advent Industrial II L.P. 346,405 Advent New York L.P. 472,799 Advent Atlantic and Pacific II L.P. 960,841 TA Venture Investors Limited Partnership 99,288 (b) Percent of Class: Percentage ---------- Advent VII L.P. 29.13 Advent Industrial II L.P. 2.13 Advent New York L.P. 2.91 Advent Atlantic and Pacific II L.P. 5.92 TA Venture Investors Limited Partnership .61 (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. 4,727,986 Advent Industrial II L.P. 346,405 Advent New York L.P. 472,799 Advent Atlantic and Pacific II L.P. 960,841 TA Venture Investors Limited Partnership 99,288 (ii) shared power to vote or direct the vote: N/A (iii) sole power to dispose or direct the Common Stock disposition: ------------ Advent VII L.P. 4,727,986 Advent Industrial II L.P. 346,405 Advent New York L.P. 472,799 Advent Atlantic and Pacific II L.P. 960,841 TA Venture Investors Limited Partnership 99,288 (iv) shared power to dispose or direct the disposition N/A - --------------- * This Schedule 13G is filed pursuant to Rule 13d-1(f) on behalf of ___________.

4 SCHEDULE 13G Page 4 of 4 Pages 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: 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. 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., and TA Venture Investors Limited Partnership, 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: /s/ Katherine S. Cromwell ------------------------------------------------------------ Katherine S. Cromwell, Managing Director ADVENT INDUSTRIAL II L.P. By: TA Associates VI L.P., its General Partner By: TA Associates, Inc. its General Partner By: /s/ Katherine S. Cromwell ------------------------------------------------------------ Katherine S. Cromwell, Managing Director 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: /s/ Katherine S. Cromwell ------------------------------------------------------------ Katherine S. Cromwell, Managing Director ADVENT NEW YORK L.P. By: TA Associates VI L.P., its General Partner By: TA Associates, Inc. its General Partner By: /s/ Katherine S. Cromwell ------------------------------------------------------------ Katherine S. Cromwell, Managing Director TA VENTURE INVESTORS LIMITED PARTNERSHIP By: /s/ Katherine S. Cromwell ------------------------------------------------------------ Katherine S. Cromwell, General Partner