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

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                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934

                          (Amendment No.            )*
                                        ------------

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

                             Downey Financial Corp.
                             ----------------------
                                (Name of Issuer)

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

                                    261018105
                                    ---------
                                 (CUSIP Number)

                                December 31, 2003
                                -----------------
             (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)

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*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).

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                                Page 1 of 9 pages



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CUSIP No. 261018105                   13G                    Page 2 of 9 Pages
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1    NAME OF REPORTING PERSON
     S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Columbia Wanger Asset Management, L.P. 36-3820584
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2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

        Not Applicable                                                    (a)[ ]
                                                                          (b)[ ]
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3    SEC USE ONLY

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4    CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware
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     NUMBER OF      5    SOLE VOTING POWER

     SHARES                                None

                    ------------------------------------------------------------
     BENEFICIALLY   6    SHARED VOTING POWER

     OWNED BY                         1,417,700

                    ------------------------------------------------------------
                    7    SOLE DISPOSITIVE POWER
     EACH
                                           None
     REPORTING
                    ------------------------------------------------------------

     PERSON WITH    8    SHARED DISPOSITIVE POWER

                                      1,417,700

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9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        1,417,700
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10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

        Not Applicable                                                       [ ]
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11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        5.1%
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12   TYPE OF REPORTING PERSON

        IA
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------------------------                                   ---------------------
CUSIP No. 261018105                   13G                    Page 3 of 9 Pages
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1    NAME OF REPORTING PERSON
     S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        WAM Acquisition GP, Inc.

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2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

        Not Applicable                                                    (a)[ ]
                                                                          (b)[ ]
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3    SEC USE ONLY

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4    CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware

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 NUMBER OF          5    SOLE VOTING POWER

 SHARES                          None

 BENEFICIALLY       ------------------------------------------------------------

 OWNED BY           6    SHARED VOTING POWER

 EACH                            1,417,700

 REPORTING          ------------------------------------------------------------
                    7    SOLE DISPOSITIVE POWER
 PERSON WITH
                                 None

                    ------------------------------------------------------------
                    8    SHARED DISPOSITIVE POWER

                                 1,417,700

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

9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        1,417,700
--------------------------------------------------------------------------------
10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

        Not Applicable                                                       [ ]
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11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        5.1%
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12   TYPE OF REPORTING PERSON

        CO
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Item 1(a) Name of Issuer:

          Downey Financial Corp.

Item 1(b) Address of Issuer's Principal Executive Offices:

          3501 Jamboree Road Newport Beach, CA 92660

Item 2(a) Name of Person Filing:

          Columbia Wanger Asset Management, L.P. ("WAM") WAM Acquisition
          GP, Inc., the general partner of WAM ("WAM GP")

Item 2(b) Address of Principal Business Office:

          WAM and WAM GP are both located at:

          227 West Monroe Street, Suite 3000
          Chicago, Illinois 60606

Item 2(c) Citizenship:

          WAM is a Delaware limited partnership; and WAM GP is a Delaware
          corporation

Item 2(d) Title of Class of Securities:

          Common Stock

Item 2(e) CUSIP Number:

          261018105

Item 3    Type of Person:

          (e)  WAM is an Investment Adviser registered under section 203 of the
               Investment Advisers Act of 1940; WAM GP is the General Partner of
               the Investment Adviser.

                                Page 4 of 9 pages



Item 4    Ownership (at December 31, 2003):

          (a)  Amount owned "beneficially" within the meaning of rule 13d-3:

               1,417,700

          (b)  Percent of class:

               5.1% (based on 27,928,722 shares outstanding as of September 30,
               2003).

          (c)  Number of shares as to which such person has:

               (i)  sole power to vote or to direct the vote: none

               (ii) shared power to vote or to direct the vote: 1,417,700

               (iii)sole power to dispose or to direct the disposition of: none

               (iv) shared power to dispose or to direct disposition of:
                    1,417,700

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:

          The shares reported herein have been acquired on behalf of
          discretionary clients of WAM. Persons other than WAM and WAM GP are
          entitled to receive all dividends from, and proceeds from the sale of,
          those shares.

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

                                Page 5 of 9 Pages



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.

                                Page 6 of 9 Pages



                                    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: February 10, 2004

          The undersigned corporation, on the date above written, agrees and
          consents to the joint filing on its behalf of this Schedule 13G in
          connection with its beneficial ownership of the security reported
          herein.

                              WAM Acquisition GP, Inc.
                                  for itself and as general partner of
                                  COLUMBIA WANGER ASSET
                                  MANAGEMENT, L.P.


                              By:  /s/ Bruce H. Lauer
                                   ---------------------------------------------
                                       Bruce H. Lauer
                                       Senior Vice President and Secretary

                                Page 7 of 9 Pages



                                  Exhibit Index

Exhibit 1 Joint Filing Agreement dated as of February 10, 2004 by and among
          Columbia Wanger Asset Management, L.P. and WAM Acquisition GP, Inc.

                                Page 8 of 9 Pages



                                                                       EXHIBIT 1

                             JOINT FILING AGREEMENT

     The undersigned hereby agree to the joint filing of the Schedule 13G to
which this Agreement is attached.

          Dated:  February 10, 2004

                                    WAM Acquisition GP, Inc.
                                        for itself and as general partner of
                                        COLUMBIA WANGER ASSET
                                        MANAGEMENT, L.P.


                                    By:  /s/ Bruce H. Lauer
                                         ---------------------------------------
                                         Bruce H. Lauer
                                         Senior Vice President and Secretary

                                Page 9 of 9 pages