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



                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934

                               (Amendment No. 3 )*

                             MATRIX SERVICE COMPANY
                                (Name of Issuer)

                                  COMMON STOCK
                         (Title of Class of Securities)

                                    576853105
                                 (CUSIP Number)

                                December 31, 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. 576853105                    13G                     Page 2 of 6 Pages



1.  NAME OF REPORTING PERSONS
    I.R.S. IDENTIFICATION NOs. OF ABOVE PERSONS

                    HEARTLAND ADVISORS, INC.

                    #39-1078128

2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

                                                        (a)  [_]
                                                        (b)  [_]

3.  SEC USE ONLY

4.  CITIZENSHIP OR PLACE OF ORGANIZATION

                                WISCONSIN, U.S.A.

--------------------------------------------------------------------------------
               NUMBER OF                5.  SOLE VOTING POWER
         SHARES BENEFICIALLY
               OWNED BY
                 EACH                           None
              REPORTING
                PERSON                  6.  SHARED VOTING POWER
                 WITH                           None

                                        7.  SOLE DISPOSITIVE POWER

                                                None

                                        8.  SHARED DISPOSITIVE POWER
                                                None

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

9.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

         0

10. CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES  ______


11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

         0.0%

12. TYPE OF REPORTING PERSON

         IA



CUSIP No. 576853105                     13G                    Page 3 of 6 Pages


1.  NAME OF REPORTING PERSONS
    I.R.S. IDENTIFICATION NOs. OF ABOVE PERSONS

                    WILLIAM J. NASGOVITZ

                    395-42-0703


2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

                                                        (a)  [_]
                                                        (b)  [_]

3.  SEC USE ONLY

4.  CITIZENSHIP OR PLACE OF ORGANIZATION

                                U.S.A.

--------------------------------------------------------------------------------
               NUMBER OF                5.  SOLE VOTING POWER
         SHARES BENEFICIALLY
                OWNED BY
                 EACH                          None
               REPORTING
                PERSON                  6.  SHARED VOTING POWER
                 WITH                          None

                                        7.  SOLE DISPOSITIVE POWER

                                               None

                                        8.  SHARED DISPOSITIVE POWER
                                               None

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

9.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

         0

10.  CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES  ______


11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

         0.0%

12.  TYPE OF REPORTING PERSON

         IN



CUSIP NUMBER  576853105                                        Page 4 Of 6 Pages

Item 1.
     (a)  Name of Issuer:   Matrix Service Company
          --------------


     (b)  Address of Issuer's Principal Executive Offices:
          -----------------------------------------------
             10701 E. Ute Street
             Tulsa, OK 74116-1517
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: 576853105
          ------------

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:  January 15, 2002



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 Matrix
Service Company at December 31, 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