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

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934

                                (Amendment No. _2___ )*


                                The Macerich CO.
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                                (Name of Issuer)


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


                                   554382101
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                                 (CUSIP Number)



                                January 31, 2006
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             (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).


                                  SCHEDULE 13G

CUSIP No.         554382101


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          1.   Names of Reporting Persons.  I.R.S.  Identification Nos. of above
               persons (entities only).
               AMVESCAP PLC
               INVESCO Asset Management (Japan) Limited
               INVESCO Asset Management Limited
               INVESCO Hong Kong Limited
               INVESCO Institutional (N.A.), Inc.

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          2.   Check the Appropriate Box if a Member of a Group (see
               Instructions)
               (a)
               (b)

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          3.   SEC Use Only  _______________________________________________

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         4.    Citizenship or Place of Organization
               AMVESCAP PLC:  England
               INVESCO Asset Management (Japan) Limited: Japan
               INVESCO Asset Management Limited: England
               INVESCO Hong Kong Limited: Hong Kong
               INVESCO Institutional (N.A.), Inc.: United States

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                           5.   Sole Voting Power 3,167,151: Such
                                shares are held by the following
                                entities in the respective amounts
                                listed:
                                INVESCO Asset Management (Japan) Limited 12,300
                                INVESCO Asset Management Limited 1,500
                                INVESCO Hong Kong Limited 6,100
                                INVESCO Institutional (N.A.), Inc. 3,147,251

Number of Shares           -----------------------------------------------------
Beneficially Owned
by Each Reporting          6.   Shared Voting Power       _______________
Person With
                           -----------------------------------------------------

                           7.   Sole Dispositive Power 3,167,151: Such
                                shares are held by the following
                                entities in the respective amounts
                                listed:
                                INVESCO Asset Management (Japan) Limited 12,300
                                INVESCO Asset Management Limited 1,500
                                INVESCO Hong Kong Limited 6,100
                                INVESCO Institutional (N.A.), Inc. 3,147,251


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

                           8.   Shared Dispositive Power     _______________






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          9.   Aggregate  Amount  Beneficially  Owned by Each  Reporting  Person
               3,167,151

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          10.  Check if the Aggregate  Amount in Row (9) Excludes Certain Shares
               (See Instructions) N/A


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          11.  Percent of Class Represented by Amount in Row (9)        4.52%
                                                                        -----


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          12.  Type of Reporting Person (See  Instructions)
               IA, HC. See Items 2 and 3 of this statement.

                                  SCHEDULE 13G


Item 1(a)     Name of Issuer:
              The Macerich Co.


Item 1(b)     Address of Issuer's Principal Executive Offices:
              401 Wilshire Boulevard, Suite 700
              Santa Monica, CA 90401



Item 2(a)     Name of Person Filing:
              AMVESCAP PLC

              In accordance with Securities and Exchange Commission Release
              No. 34-39538 (January 12, 1998), this statement on Schedule
              13G or amendment thereto is being filed by AMVESCAP PLC
              ("AMVESCAP"), a U.K. entity, on behalf of itself and its
              subsidiaries listed in Item 4 of the cover of this statement.
              AMVESCAP through such subsidiaries provides investment
              management services to institutional and individual investors
              worldwide.

              Executive officers and directors of AMVESCAP or its
              subsidiaries may beneficially own shares of the securities of
              the issuer to which this statement relates (the "Shares"),
              and such Shares are not reported in this statement. AMVESCAP
              and its subsidiaries disclaim beneficial ownership of Shares
              beneficially owned by any of their executive officers and
              directors. Each of AMVESCAP's direct and indirect
              subsidiaries also disclaim beneficial ownership of Shares
              beneficially owned by AMVESCAP and any other subsidiary.


Item 2(b)     Address of Principal Business Office:
              11 Devonshire Square
              London EC2M 4YR
              England


Item 2(c)     Citizenship:
              See the response to Item 2(a) of this statement.


Item 2(d)     Title of Class of Securities:
              Common Stock, $.01 par value per share


Item 2(e)     CUSIP Number:
              554382101


Item 3        Type of Reporting Person:
              An investment adviser in accordance with section
              240.13d-1(b)(1)(ii)(E)
              A parent holding company or control person in accordance
              with section 240.13d-1(b)(1)(ii)(G)

              As noted in Item 2 above, AMVESCAP is making this filing on
              behalf of its subsidiaries listed herein. Each of these
              entities is either an investment adviser registered with the
              United States Securities Exchange Commission under Section
              203 of the Investment Advisers Act of 1940, as amended, or
              under similar laws of other jurisdictions. AMVESCAP is a
              holding company.

Item 4        Ownership:
              Please see responses to Items 5-8 on the cover of this
              statement, which are incorporated herein by reference.


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:
              N/A


Item 7        Identification and Classification of the Subsidiary Which
              Acquired the Security Being reported on By the Parent
              Holding Company:
              Please see Item 3 of this statement, which is incorporated
              herein by reference.


Item 8        Identification and Classification of Members of the Group:
              N/A


Item 9        Notice of Dissolution of a Group:
              N/A


Item 10       Certification:
              By signing below I certify that, to the best of my 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.


                                                 February 10, 2006
                                        ---------------------------------------
                                                     Date

                                        AMVESCAP PLC

                                        By:      /s/  Lisa Brinkley
                                        ---------------------------------------


                                            Lisa Brinkley
                                        Chief Compliance Officer