Amended Statement of Beneficial Ownership


UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No. 2)*

ANSYS, INC.
(Name of Issuer)

COMMON STOCK
(Title of Class of Securities)

03662Q105
(CUSIP Number)

April 30, 2001
(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

[X] Rule 13d-1(b)
[ ] Rule 13d-1(c)
[ ] Rule 13d-1(d)

*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).

Page 1 of 6 pages


  CUSIP NO.  03662Q105                     13G             Page 2 of 6 Pages

------------------------------------------------------------------------------
      NAME OF REPORTING PERSONS
 1    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

             HEARTLAND ADVISORS, INC.

             #39-1078128

------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 2                                                              (a) [_]
                                                                (b) [_]

------------------------------------------------------------------------------
      SEC USE ONLY
 3


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

            WISCONSIN, U.S.A.
------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5
     NUMBER OF
                          430,000
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          None
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7
    REPORTING             658,200

      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                          None
------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9
             658,200
------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
10
                                                                    [_]

------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11
             4.6%

------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON
12

             IA
------------------------------------------------------------------------------


  CUSIP NO. 03662Q105                    13G               Page 3 of 6 Pages

------------------------------------------------------------------------------
      NAME OF REPORTING PERSONS
 1    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

             WILLIAM J. NASGOVITZ       000-00-0000

------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 2                                                              (a) [_]
                                                                (b) [_]

------------------------------------------------------------------------------
      SEC USE ONLY
 3


------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4
             U.S.A.
------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5
     NUMBER OF               120,000

      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                             None
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7
    REPORTING                None

      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                             None
------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9
             120,000
------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
10
                                                                    [_]

------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11
             0.8%

------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON
12
             IN

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


CUSIP NUMBER   03662Q105                   Page 4 Of 6 Pages

Item 1.
    (a) Name of Issuer:   ANSYS, Inc.
        --------------


    (b) Address of Issuer's Principal Executive Offices:
        -----------------------------------------------
     275 Technology Drive
     Canonsburg, PA 15317

Item 2.
    (a) Name of Person Filing:   (1) Heartland Advisors, Inc.
        ---------------------
                                 (2) William J. Nasgovitz


    (b) Address of Principal Business Office:
        ------------------------------------
        (1) 789 North Water Street             (2) 789 North Water Street
            Milwaukee, WI  53202                   Milwaukee, WI  53202


    (c) Citizenship:       Heartland Advisors is a Wisconsin corporation.
        -----------
                           William J. Nasgovitz - U.S.A.

    (d) Title of Class of Securities:  Common Stock
        ----------------------------

    (e) CUSIP Number: 03662Q105
        ------------

Item 3.   The persons filing this Schedule 13G are Heartland Advisors, Inc., an
investment adviser registered with the SEC, and William J. Nasgovitz, President
and principal shareholder of Heartland Advisors, Inc.  Mr. Nasgovitz joins in
this filing pursuant to SEC staff positions authorizing certain individuals in
similar situations to join in a filing with a controlled entity eligible to file
on Schedule 13G.  The reporting persons do not admit that they constitute a
group.

Item 4. Ownership.
        ---------

     For information on ownership, voting and dispositive power with respect to
the above listed shares, see Items 5-9 of the Cover Page.


Item 5. Ownership of Five Percent or Less of a Class.
        --------------------------------------------

     If this statement is being filed to report the fact that as of the date
hereof the reporting person has ceased to be the beneficial owner of more than
five percent of the class of securities, check the following: [X]

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.

Item 10. Certification.

By signing below, the undersigned certify that, to the best of their knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose 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.

DATE: May 3, 2001



WILLIAM J. NASGOVITZ                HEARTLAND ADVISORS, INC.

By: /s/  PAUL T. BESTE              By: /s/ PAUL T. BESTE
----------------------              ---------------------
   Paul T. Beste                       Paul T. Beste
   As Attorney in Fact for             Chief Operating Officer
   William J. Nasgovitz

EXHIBIT INDEX

Exhibit 1 Joint Filing Agreement


EXHIBIT 1

Joint Filing Agreement

The undersigned persons agree and consent to the joint filing on their behalf of this Schedule 13G in connection with their beneficial ownership of ANSYS, Inc. at April 30, 2001.

WILLIAM J. NASGOVITZ

By: /s/   PAUL T. BESTE
    -------------------
        Paul T. Beste
As Attorney in Fact for William J. Nasgovitz

HEARTLAND ADVISORS, INC.

By:  /s/ PAUL T. BESTE
     ----------------
       Paul T. Beste

       Chief Operating Officer