-----BEGIN PRIVACY-ENHANCED MESSAGE----- Proc-Type: 2001,MIC-CLEAR Originator-Name: webmaster@www.sec.gov Originator-Key-Asymmetric: MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB MIC-Info: RSA-MD5,RSA, TGpgc13nHgQ5MZ9sDzWZltcG9ojYMQVdPIm8sC0hPAUVxFGjCDu6WAynRxBgFeUW +cgFEXJem3H9jxRCEHVnNg== 0001285923-04-001047.txt : 20040929 0001285923-04-001047.hdr.sgml : 20040929 20040929103352 ACCESSION NUMBER: 0001285923-04-001047 CONFORMED SUBMISSION TYPE: 8-K PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20040927 ITEM INFORMATION: Other Events ITEM INFORMATION: Financial Statements and Exhibits FILED AS OF DATE: 20040929 DATE AS OF CHANGE: 20040929 FILER: COMPANY DATA: COMPANY CONFORMED NAME: WASHINGTON MUTUAL MSC MORT PASS THROUGH CERT SER 2003-MS3 CENTRAL INDEX KEY: 0001221045 STANDARD INDUSTRIAL CLASSIFICATION: ASSET-BACKED SECURITIES [6189] STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 8-K SEC ACT: 1934 Act SEC FILE NUMBER: 333-77026-49 FILM NUMBER: 041051444 BUSINESS ADDRESS: STREET 1: 75 N FAIRWAY DR CITY: VERNON HILLS STATE: IL ZIP: 60061 8-K 1 signwamms2003_ms3.htm LETTER

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 8-K
CURRENT REPORT

Pursuant to Section 13 or 15(d) of the
Securities Exchange Act of 1934

Date of Report (date of earliest event reported):  September 27, 2004
 

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.

WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATES
SERIES 2003-MS3
(Exact name of Registrant as specified in its charter)

Delaware 333-77026-49 94-2528990
(State or other jurisdiction
of incorporation)		 (Commission File Number)(I.R.S. Employer
Identification No.)

1201 THIRD AVENUE, WMT 1706
SEATTLE, WASHINGTON 98101
 (Address of principal executive offices and Zip Code)

Registrant's telephone number, including area code: (206) 377-8555

 

SECTION 8.  OTHER EVENTS

ITEM 8.01 Other Events

     This Current Report on Form 8-K relates to the distribution report furnished to certificate holders in connection with the September 2004 distribution.

SECTION 9.    FINANCIAL STATEMENTS AND EXHIBITS

ITEM 9.01 Financial Statements and Exhibits

(a) Not applicable

(b) Not applicable

(c)  Exhibits

Exhibit No.

Description

99.1

Washington Mutual MSC
Mortgage Pass-Through Certificates, Series 2003-MS3
Monthly Distribution Report for September 2004

 

 

2

SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

    WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.

Date:       September 29, 2004
 
By:
 
/s/ Tammy Spriggs
Tammy Spriggs
First Vice President
(Authorized Officer)

 

 

 

 

3

 

 

EXHIBIT INDEX

 

Exhibit No.

Description

99.1

Washington Mutual MSC
Mortgage Pass-Through Certificates, Series 2003-MS3
Monthly Distribution Report for September 2004

 EX-99 2 wamms2003_ms3.htm EXHIBIT


WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS3
Distribution Date: 09/27/2004
 
Class Cusip Orig Prin Bal Begin Prin Bal Int Rate Accrued Int Rate Paid Int Dist Prin Dist Int Shortfall PPIS Uncomp Int Shortfall Prin Loss Deferred Interest Int Reimbursed Unsched Int Prin Reimbursed Subsequent Recoveries Total Dist Ending Class Bal
IA1 939336RW5 $300,000,000.00 $17,001,395.51 5.7500000000% 5.7500000000% $81,465.02 $3,271,474.37 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $3,352,939.39 $13,729,921.14
IA2 939336RX3 $25,000,000.00 $25,000,000.00 5.7500000000% 5.7500000000% $119,791.67 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $119,791.67 $25,000,000.00
IA3 939336RY1 $1,000,000.00 $1,000,000.00 5.5000000000% 5.5000000000% $4,583.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $4,583.33 $1,000,000.00
IA4 939336RZ8 $46,000,000.00 $46,000,000.00 5.7500000000% 5.7500000000% $220,416.67 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $220,416.67 $46,000,000.00
IA5 939336SA2 $6,992,000.00 $6,992,000.00 5.7500000000% 5.7500000000% $33,503.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $33,503.33 $6,992,000.00
IA6 939336SB0 $1,000,000.00 $1,000,000.00 5.5000000000% 5.5000000000% $4,583.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $4,583.33 $1,000,000.00
IA7 939336SC8 $1,000,000.00 $1,000,000.00 5.5000000000% 5.5000000000% $4,583.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $4,583.33 $1,000,000.00
IA8 939336SD6 $1,000,000.00 $1,000,000.00 5.5000000000% 5.5000000000% $4,583.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $4,583.33 $1,000,000.00
IA9 939336SE4 $1,000,000.00 $1,000,000.00 5.5000000000% 5.5000000000% $4,583.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $4,583.33 $1,000,000.00
IA10 939336SF1 $1,000,000.00 $1,000,000.00 5.5000000000% 5.5000000000% $4,583.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $4,583.33 $1,000,000.00
IA11 939336SG9 $1,000,000.00 $1,000,000.00 5.5000000000% 5.5000000000% $4,583.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $4,583.33 $1,000,000.00
IA12 939336SH7 $1,000,000.00 $1,000,000.00 5.5000000000% 5.5000000000% $4,583.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $4,583.33 $1,000,000.00
IA13 939336SJ3 $1,000,000.00 $1,000,000.00 5.5000000000% 5.5000000000% $4,583.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $4,583.33 $1,000,000.00
IA14 939336SK0 $1,000,000.00 $1,000,000.00 5.5000000000% 5.5000000000% $4,583.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $4,583.33 $1,000,000.00
IA15 939336SL8 $3,000,000.00 $3,000,000.00 5.7500000000% 5.7500000000% $14,375.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $14,375.00 $3,000,000.00
IA16 939336SM6 $3,000,000.00 $3,000,000.00 5.7500000000% 5.7500000000% $14,375.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $14,375.00 $3,000,000.00
IA17 939336SN4 $3,000,000.00 $3,000,000.00 5.7500000000% 5.7500000000% $14,375.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $14,375.00 $3,000,000.00
IA18 939336SP9 $3,000,000.00 $3,000,000.00 5.7500000000% 5.7500000000% $14,375.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $14,375.00 $3,000,000.00
IA19 939336SQ7 $1,500,000.00 $1,500,000.00 6.0000000000% 6.0000000000% $7,500.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $7,500.00 $1,500,000.00
IA20 939336SR5 $1,500,000.00 $1,500,000.00 5.5000000000% 5.5000000000% $6,875.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $6,875.00 $1,500,000.00
IA21 939336SS3 $1,086,956.52 $1,086,956.52 5.7500000000% 5.7500000000% $5,208.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $5,208.33 $1,086,956.52
IA22 939336VW0 $50,627,000.00 $8,629,922.95 5.7500000000% 5.7500000000% $41,351.71 $485,487.77 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $526,839.48 $8,144,435.18
IA23 939336VX8 $25,059,375.00 $4,771,627.71 4.5000000000% 4.5000000000% $17,893.60 $234,527.11 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $252,420.72 $4,537,100.60
IA24 939336VY6 $24,850,000.00 $24,850,000.00 5.7500000000% 5.7500000000% $119,072.92 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $119,072.92 $24,850,000.00
IA25 939336VZ3 $11,390,625.00 $2,168,921.70 2.2250000000% 2.2250000000% $4,021.54 $106,603.23 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $110,624.77 $2,062,318.47
IA26 939336WA7 $11,390,625.00 $2,168,921.70 6.2750000000% 6.2750000000% $11,341.65 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $11,341.65 $2,062,318.47
IA27 939336WB5 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA28 939336WC3 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA29 939336WD1 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA30 939336WE9 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA31 939336WF6 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS3
Distribution Date: 09/27/2004
 
Class Cusip Orig Prin Bal Begin Prin Bal Int Rate Accrued Int Rate Paid Int Dist Prin Dist Int Shortfall PPIS Uncomp Int Shortfall Prin Loss Deferred Interest Int Reimbursed Unsched Int Prin Reimbursed Subsequent Recoveries Total Dist Ending Class Bal
IA32 939336WG4 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA33 939336WH2 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA34 939336WJ8 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA35 939336WK5 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA36 939336WL3 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA37 939336WM1 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA38 939336WN9 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA39 939336WP4 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA40 939336WQ2 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA41 939336WR0 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA42 939336WS8 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA43 939336WT6 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA44 939336WU3 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA45 939336WV1 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA46 939336WW9 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA47 939336WX7 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA48 939336WY5 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA49 939336WZ2 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA50 939336XA6 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA51 939336XB4 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA52 939336XC2 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA53 939336XD0 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA54 939336XE8 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA55 939336XF5 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA56 939336XG3 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA57 939336XH1 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA58 939336XJ7 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA59 939336XK4 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA60 939336XL2 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA61 939336XM0 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00
IA62 939336XN8 $400,000.00 $400,000.00 5.5000000000% 5.5000000000% $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33 $400,000.00



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS3
Distribution Date: 09/27/2004
 
Class Cusip Orig Prin Bal Begin Prin Bal Int Rate Accrued Int Rate Paid Int Dist Prin Dist Int Shortfall PPIS Uncomp Int Shortfall Prin Loss Deferred Interest Int Reimbursed Unsched Int Prin Reimbursed Subsequent Recoveries Total Dist Ending Class Bal
IA63 939336XP3 $600,000.00 $600,000.00 5.5000000000% 5.5000000000% $2,750.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $2,750.00 $600,000.00
IIA1 939336XQ1 $125,395,000.00 $50,135,557.43 5.2500000000% 5.2500000000% $219,343.06 $1,106,456.09 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,325,799.16 $49,029,101.34
IIA2 939336XR9 $52,370,500.00 $20,938,826.97 4.5000000000% 4.5000000000% $78,520.60 $462,105.02 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $540,625.62 $20,476,721.95
IIA3 939336XS7 $327,000.00 $130,741.48 4.5000000000% 4.5000000000% $490.28 $2,885.37 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $3,375.65 $127,856.11
IIA4 939336XT5 $10,000,000.00 $3,998,210.24 4.5000000000% 4.5000000000% $14,993.29 $88,237.66 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $103,230.94 $3,909,972.58
IIA5 939336XU2 $3,500,000.00 $1,399,373.60 5.0000000000% 5.0000000000% $5,830.72 $30,883.18 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $36,713.90 $1,368,490.42
IIA6 939336XV0 $10,000,000.00 $3,998,210.24 5.0000000000% 5.0000000000% $16,659.21 $88,237.66 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $104,896.87 $3,909,972.58
IX 939336SU8 $6,779,035.00 $1,928,729.81 5.7500000000% 5.7500000000% $9,241.83 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $9,241.83 $1,915,229.91
IIX 939336SV6 $12,486,599.00 $4,235,527.20 5.0000000000% 5.0000000000% $17,648.03 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $17,648.03 $4,110,481.54
IP 939336SW4 $1,101,174.80 $873,587.16 0.0000000000% 0.0000000000% $0.00 $6,870.11 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $6,870.11 $866,717.05
IIP 939336SX2 $96,394.50 $85,234.38 0.0000000000% 0.0000000000% $0.00 $413.23 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $413.23 $84,821.14
CB1 939336SY0 $9,418,327.00 $9,103,851.72 5.5511353732% 5.5511353732% $42,113.93 $18,015.92 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $60,129.85 $9,085,835.80
CB2 939336SZ7 $4,520,574.00 $4,369,633.31 5.5511353732% 5.5511353732% $20,213.69 $8,647.21 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $28,860.90 $4,360,986.10
CB3 939336TA1 $3,013,716.00 $2,913,088.88 5.5511353732% 5.5511353732% $13,475.79 $5,764.81 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $19,240.60 $2,907,324.07
CB4 939336TC7 $1,130,143.00 $1,092,407.83 5.5511353732% 5.5511353732% $5,053.42 $2,161.80 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $7,215.22 $1,090,246.03
CB5 939336TD5 $1,130,143.00 $1,092,407.83 5.5511353732% 5.5511353732% $5,053.42 $2,161.80 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $7,215.22 $1,090,246.03
CB6 939336TE3 $1,506,857.67 $1,456,544.15 5.5511353732% 5.5511353732% $6,737.89 $2,882.29 $0.00 $0.00 $0.00 $0.10 $0.00 $0.00 $0.00 $0.00 $0.00 $9,620.19 $1,453,661.76
R 939336TB9 $100.00 $0.00 0.0000000000% 0.0000000000% $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00
R_SYN XXXXXXXXX $0.00 $0.00 0.0000000000% 0.0000000000% $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00
Total   $753,428,929.97 $277,001,543.09     $1,295,899.95 $5,923,814.64 $0.00 $0.00 $0.00 $0.10 $0.00 $0.00 $0.00 $0.00 $0.00 $7,219,714.59 $271,077,728.35



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS3
Distribution Date: 09/27/2004
 
Class Orig Face Beg Bal Prin Loss Prin Reimbursed Subsequent Recoveries Deferred Interest Total Prin End Cert Pct End Cert Bal
IA1 $300,000,000.00 $17,001,395.51 $0.00 $0.00 $0.00 $0.00 $3,271,474.37 0.0457664038 $13,729,921.14
IA2 $25,000,000.00 $25,000,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $25,000,000.00
IA3 $1,000,000.00 $1,000,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $1,000,000.00
IA4 $46,000,000.00 $46,000,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $46,000,000.00
IA5 $6,992,000.00 $6,992,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $6,992,000.00
IA6 $1,000,000.00 $1,000,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $1,000,000.00
IA7 $1,000,000.00 $1,000,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $1,000,000.00
IA8 $1,000,000.00 $1,000,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $1,000,000.00
IA9 $1,000,000.00 $1,000,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $1,000,000.00
IA10 $1,000,000.00 $1,000,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $1,000,000.00
IA11 $1,000,000.00 $1,000,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $1,000,000.00
IA12 $1,000,000.00 $1,000,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $1,000,000.00
IA13 $1,000,000.00 $1,000,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $1,000,000.00
IA14 $1,000,000.00 $1,000,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $1,000,000.00
IA15 $3,000,000.00 $3,000,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $3,000,000.00
IA16 $3,000,000.00 $3,000,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $3,000,000.00
IA17 $3,000,000.00 $3,000,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $3,000,000.00
IA18 $3,000,000.00 $3,000,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $3,000,000.00
IA19 $1,500,000.00 $1,500,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $1,500,000.00
IA20 $1,500,000.00 $1,500,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $1,500,000.00
IA21 $1,086,956.52 $1,086,956.52 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $1,086,956.52
IA22 $50,627,000.00 $8,629,922.95 $0.00 $0.00 $0.00 $0.00 $485,487.77 0.1608713765 $8,144,435.18
IA23 $25,059,375.00 $4,771,627.71 $0.00 $0.00 $0.00 $0.00 $234,527.11 0.1810540207 $4,537,100.60
IA24 $24,850,000.00 $24,850,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $24,850,000.00
IA25 $11,390,625.00 $2,168,921.70 $0.00 $0.00 $0.00 $0.00 $106,603.23 0.1810540221 $2,062,318.47
IA26 $11,390,625.00 $2,168,921.70 $0.00 $0.00 $0.00 $0.00 $0.00 0.1810540221 $2,062,318.47
IA27 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA28 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA29 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA30 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA31 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS3
Distribution Date: 09/27/2004
 
Class Orig Face Beg Bal Prin Loss Prin Reimbursed Subsequent Recoveries Deferred Interest Total Prin End Cert Pct End Cert Bal
IA32 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA33 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA34 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA35 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA36 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA37 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA38 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA39 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA40 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA41 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA42 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA43 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA44 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA45 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA46 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA47 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA48 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA49 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA50 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA51 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA52 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA53 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA54 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA55 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA56 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA57 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA58 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA59 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA60 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA61 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00
IA62 $400,000.00 $400,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $400,000.00



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS3
Distribution Date: 09/27/2004
 
Class Orig Face Beg Bal Prin Loss Prin Reimbursed Subsequent Recoveries Deferred Interest Total Prin End Cert Pct End Cert Bal
IA63 $600,000.00 $600,000.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $600,000.00
IIA1 $125,395,000.00 $50,135,557.43 $0.00 $0.00 $0.00 $0.00 $1,106,456.09 0.3909972594 $49,029,101.34
IIA2 $52,370,500.00 $20,938,826.97 $0.00 $0.00 $0.00 $0.00 $462,105.02 0.3909972590 $20,476,721.95
IIA3 $327,000.00 $130,741.48 $0.00 $0.00 $0.00 $0.00 $2,885.37 0.3909972783 $127,856.11
IIA4 $10,000,000.00 $3,998,210.24 $0.00 $0.00 $0.00 $0.00 $88,237.66 0.3909972580 $3,909,972.58
IIA5 $3,500,000.00 $1,399,373.60 $0.00 $0.00 $0.00 $0.00 $30,883.18 0.3909972629 $1,368,490.42
IIA6 $10,000,000.00 $3,998,210.24 $0.00 $0.00 $0.00 $0.00 $88,237.66 0.3909972580 $3,909,972.58
IX $6,779,035.00 $1,928,729.81 $0.00 $0.00 $0.00 $0.00 $0.00 0.2825224991 $1,915,229.91
IIX $12,486,599.00 $4,235,527.20 $0.00 $0.00 $0.00 $0.00 $0.00 0.3291914428 $4,110,481.54
IP $1,101,174.80 $873,587.16 $0.00 $0.00 $0.00 $0.00 $6,870.11 0.7870839852 $866,717.05
IIP $96,394.50 $85,234.38 $0.00 $0.00 $0.00 $0.00 $413.23 0.8799375483 $84,821.14
CB1 $9,418,327.00 $9,103,851.72 $0.00 $0.00 $0.00 $0.00 $18,015.92 0.9646974245 $9,085,835.80
CB2 $4,520,574.00 $4,369,633.31 $0.00 $0.00 $0.00 $0.00 $8,647.21 0.9646974256 $4,360,986.10
CB3 $3,013,716.00 $2,913,088.88 $0.00 $0.00 $0.00 $0.00 $5,764.81 0.9646974267 $2,907,324.07
CB4 $1,130,143.00 $1,092,407.83 $0.00 $0.00 $0.00 $0.00 $2,161.80 0.9646974144 $1,090,246.03
CB5 $1,130,143.00 $1,092,407.83 $0.00 $0.00 $0.00 $0.00 $2,161.80 0.9646974144 $1,090,246.03
CB6 $1,506,857.67 $1,456,544.15 $0.10 $0.00 $0.00 $0.00 $2,882.29 0.9646974555 $1,453,661.76
R $100.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 0.0000000000 $0.00
R_SYN $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 0.0000000000 $0.00
Total $753,428,929.97 $277,001,543.09 $0.10 $0.00 $0.00 $0.00 $5,923,814.64 0.3597920355 $271,077,728.35



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS3
Distribution Date: 09/27/2004
PER $1000 DENOMINATION
Class Orig Face Beg Bal Prin Loss Prin Reimbursed Subsequent Recoveries Deferred Interest Total Prin End Cert Pct End Cert Bal
IA1 $300,000,000.00 56.67131837 0.00000000 0.00000000 0.00000000 0.00000000 10.90491457 0.0457664038 45.76640380
IA2 $25,000,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA3 $1,000,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA4 $46,000,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA5 $6,992,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA6 $1,000,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA7 $1,000,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA8 $1,000,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA9 $1,000,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA10 $1,000,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA11 $1,000,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA12 $1,000,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA13 $1,000,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA14 $1,000,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA15 $3,000,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA16 $3,000,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA17 $3,000,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA18 $3,000,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA19 $1,500,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA20 $1,500,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA21 $1,086,956.52 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA22 $50,627,000.00 170.46087957 0.00000000 0.00000000 0.00000000 0.00000000 9.58950303 0.1608713765 160.87137654
IA23 $25,059,375.00 190.41287782 0.00000000 0.00000000 0.00000000 0.00000000 9.35885711 0.1810540207 181.05402070
IA24 $24,850,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA25 $11,390,625.00 190.41287901 0.00000000 0.00000000 0.00000000 0.00000000 9.35885695 0.1810540221 181.05402206
IA26 $11,390,625.00 190.41287901 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.1810540221 181.05402206
IA27 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA28 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA29 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA30 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA31 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS3
Distribution Date: 09/27/2004
PER $1000 DENOMINATION
Class Orig Face Beg Bal Prin Loss Prin Reimbursed Subsequent Recoveries Deferred Interest Total Prin End Cert Pct End Cert Bal
IA32 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA33 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA34 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA35 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA36 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA37 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA38 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA39 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA40 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA41 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA42 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA43 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA44 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA45 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA46 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA47 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA48 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA49 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA50 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA51 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA52 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA53 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA54 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA55 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA56 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA57 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA58 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA59 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA60 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA61 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IA62 $400,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS3
Distribution Date: 09/27/2004
PER $1000 DENOMINATION
Class Orig Face Beg Bal Prin Loss Prin Reimbursed Subsequent Recoveries Deferred Interest Total Prin End Cert Pct End Cert Bal
IA63 $600,000.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
IIA1 $125,395,000.00 399.82102500 0.00000000 0.00000000 0.00000000 0.00000000 8.82376562 0.3909972594 390.99725938
IIA2 $52,370,500.00 399.82102462 0.00000000 0.00000000 0.00000000 0.00000000 8.82376567 0.3909972590 390.99725895
IIA3 $327,000.00 399.82103976 0.00000000 0.00000000 0.00000000 0.00000000 8.82376147 0.3909972783 390.99727829
IIA4 $10,000,000.00 399.82102400 0.00000000 0.00000000 0.00000000 0.00000000 8.82376600 0.3909972580 390.99725800
IIA5 $3,500,000.00 399.82102857 0.00000000 0.00000000 0.00000000 0.00000000 8.82376571 0.3909972629 390.99726286
IIA6 $10,000,000.00 399.82102400 0.00000000 0.00000000 0.00000000 0.00000000 8.82376600 0.3909972580 390.99725800
IX $6,779,035.00 284.51391828 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.2825224991 282.52249915
IIX $12,486,599.00 339.20583179 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.3291914428 329.19144276
IP $1,101,174.80 793.32287662 0.00000000 0.00000000 0.00000000 0.00000000 6.23889141 0.7870839852 787.08398521
IIP $96,394.50 884.22451488 0.00000000 0.00000000 0.00000000 0.00000000 4.28686284 0.8799375483 879.93754830
CB1 $9,418,327.00 966.61028227 0.00000000 0.00000000 0.00000000 0.00000000 1.91285777 0.9646974245 964.69742450
CB2 $4,520,574.00 966.61028223 0.00000000 0.00000000 0.00000000 0.00000000 1.91285664 0.9646974256 964.69742559
CB3 $3,013,716.00 966.61028445 0.00000000 0.00000000 0.00000000 0.00000000 1.91285775 0.9646974267 964.69742670
CB4 $1,130,143.00 966.61026967 0.00000000 0.00000000 0.00000000 0.00000000 1.91285528 0.9646974144 964.69741440
CB5 $1,130,143.00 966.61026967 0.00000000 0.00000000 0.00000000 0.00000000 1.91285528 0.9646974144 964.69741440
CB6 $1,506,857.67 966.61030368 0.00006636 0.00000000 0.00000000 0.00000000 1.91278185 0.9646974555 964.69745547
R $100.00 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.0000000000 0.00000000
R_SYN $0.00 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.0000000000 0.00000000



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS3
Distribution Date: 09/27/2004
 
Class Orig Face Int Rate Accrued Int Rate Paid Beg Cert Prin/Not Bal Current Int Accrued Int Shortfall PPIS Uncompensated Int Shortfall Unscheduled Int Int Reimbursed Total Int Dist
IA1 $300,000,000.00 5.7500000000% 5.7500000000% $17,001,395.51 $81,465.02 $0.00 $0.00 $0.00 $0.00 $0.00 $81,465.02
IA2 $25,000,000.00 5.7500000000% 5.7500000000% $25,000,000.00 $119,791.67 $0.00 $0.00 $0.00 $0.00 $0.00 $119,791.67
IA3 $1,000,000.00 5.5000000000% 5.5000000000% $1,000,000.00 $4,583.33 $0.00 $0.00 $0.00 $0.00 $0.00 $4,583.33
IA4 $46,000,000.00 5.7500000000% 5.7500000000% $46,000,000.00 $220,416.67 $0.00 $0.00 $0.00 $0.00 $0.00 $220,416.67
IA5 $6,992,000.00 5.7500000000% 5.7500000000% $6,992,000.00 $33,503.33 $0.00 $0.00 $0.00 $0.00 $0.00 $33,503.33
IA6 $1,000,000.00 5.5000000000% 5.5000000000% $1,000,000.00 $4,583.33 $0.00 $0.00 $0.00 $0.00 $0.00 $4,583.33
IA7 $1,000,000.00 5.5000000000% 5.5000000000% $1,000,000.00 $4,583.33 $0.00 $0.00 $0.00 $0.00 $0.00 $4,583.33
IA8 $1,000,000.00 5.5000000000% 5.5000000000% $1,000,000.00 $4,583.33 $0.00 $0.00 $0.00 $0.00 $0.00 $4,583.33
IA9 $1,000,000.00 5.5000000000% 5.5000000000% $1,000,000.00 $4,583.33 $0.00 $0.00 $0.00 $0.00 $0.00 $4,583.33
IA10 $1,000,000.00 5.5000000000% 5.5000000000% $1,000,000.00 $4,583.33 $0.00 $0.00 $0.00 $0.00 $0.00 $4,583.33
IA11 $1,000,000.00 5.5000000000% 5.5000000000% $1,000,000.00 $4,583.33 $0.00 $0.00 $0.00 $0.00 $0.00 $4,583.33
IA12 $1,000,000.00 5.5000000000% 5.5000000000% $1,000,000.00 $4,583.33 $0.00 $0.00 $0.00 $0.00 $0.00 $4,583.33
IA13 $1,000,000.00 5.5000000000% 5.5000000000% $1,000,000.00 $4,583.33 $0.00 $0.00 $0.00 $0.00 $0.00 $4,583.33
IA14 $1,000,000.00 5.5000000000% 5.5000000000% $1,000,000.00 $4,583.33 $0.00 $0.00 $0.00 $0.00 $0.00 $4,583.33
IA15 $3,000,000.00 5.7500000000% 5.7500000000% $3,000,000.00 $14,375.00 $0.00 $0.00 $0.00 $0.00 $0.00 $14,375.00
IA16 $3,000,000.00 5.7500000000% 5.7500000000% $3,000,000.00 $14,375.00 $0.00 $0.00 $0.00 $0.00 $0.00 $14,375.00
IA17 $3,000,000.00 5.7500000000% 5.7500000000% $3,000,000.00 $14,375.00 $0.00 $0.00 $0.00 $0.00 $0.00 $14,375.00
IA18 $3,000,000.00 5.7500000000% 5.7500000000% $3,000,000.00 $14,375.00 $0.00 $0.00 $0.00 $0.00 $0.00 $14,375.00
IA19 $1,500,000.00 6.0000000000% 6.0000000000% $1,500,000.00 $7,500.00 $0.00 $0.00 $0.00 $0.00 $0.00 $7,500.00
IA20 $1,500,000.00 5.5000000000% 5.5000000000% $1,500,000.00 $6,875.00 $0.00 $0.00 $0.00 $0.00 $0.00 $6,875.00
IA21 $1,086,956.52 5.7500000000% 5.7500000000% $1,086,956.52 $5,208.33 $0.00 $0.00 $0.00 $0.00 $0.00 $5,208.33
IA22 $50,627,000.00 5.7500000000% 5.7500000000% $8,629,922.95 $41,351.71 $0.00 $0.00 $0.00 $0.00 $0.00 $41,351.71
IA23 $25,059,375.00 4.5000000000% 4.5000000000% $4,771,627.71 $17,893.60 $0.00 $0.00 $0.00 $0.00 $0.00 $17,893.60
IA24 $24,850,000.00 5.7500000000% 5.7500000000% $24,850,000.00 $119,072.92 $0.00 $0.00 $0.00 $0.00 $0.00 $119,072.92
IA25 $11,390,625.00 2.2250000000% 2.2250000000% $2,168,921.70 $4,021.54 $0.00 $0.00 $0.00 $0.00 $0.00 $4,021.54
IA26 $11,390,625.00 6.2750000000% 6.2750000000% $2,168,921.70 $11,341.65 $0.00 $0.00 $0.00 $0.00 $0.00 $11,341.65
IA27 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA28 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA29 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA30 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA31 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS3
Distribution Date: 09/27/2004
 
Class Orig Face Int Rate Accrued Int Rate Paid Beg Cert Prin/Not Bal Current Int Accrued Int Shortfall PPIS Uncompensated Int Shortfall Unscheduled Int Int Reimbursed Total Int Dist
IA32 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA33 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA34 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA35 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA36 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA37 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA38 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA39 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA40 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA41 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA42 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA43 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA44 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA45 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA46 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA47 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA48 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA49 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA50 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA51 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA52 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA53 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA54 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA55 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA56 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA57 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA58 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA59 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA60 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA61 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33
IA62 $400,000.00 5.5000000000% 5.5000000000% $400,000.00 $1,833.33 $0.00 $0.00 $0.00 $0.00 $0.00 $1,833.33



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS3
Distribution Date: 09/27/2004
 
Class Orig Face Int Rate Accrued Int Rate Paid Beg Cert Prin/Not Bal Current Int Accrued Int Shortfall PPIS Uncompensated Int Shortfall Unscheduled Int Int Reimbursed Total Int Dist
IA63 $600,000.00 5.5000000000% 5.5000000000% $600,000.00 $2,750.00 $0.00 $0.00 $0.00 $0.00 $0.00 $2,750.00
IIA1 $125,395,000.00 5.2500000000% 5.2500000000% $50,135,557.43 $219,343.06 $0.00 $0.00 $0.00 $0.00 $0.00 $219,343.06
IIA2 $52,370,500.00 4.5000000000% 4.5000000000% $20,938,826.97 $78,520.60 $0.00 $0.00 $0.00 $0.00 $0.00 $78,520.60
IIA3 $327,000.00 4.5000000000% 4.5000000000% $130,741.48 $490.28 $0.00 $0.00 $0.00 $0.00 $0.00 $490.28
IIA4 $10,000,000.00 4.5000000000% 4.5000000000% $3,998,210.24 $14,993.29 $0.00 $0.00 $0.00 $0.00 $0.00 $14,993.29
IIA5 $3,500,000.00 5.0000000000% 5.0000000000% $1,399,373.60 $5,830.72 $0.00 $0.00 $0.00 $0.00 $0.00 $5,830.72
IIA6 $10,000,000.00 5.0000000000% 5.0000000000% $3,998,210.24 $16,659.21 $0.00 $0.00 $0.00 $0.00 $0.00 $16,659.21
IX $6,779,035.00 5.7500000000% 5.7500000000% $1,928,729.81 $9,241.83 $0.00 $0.00 $0.00 $0.00 $0.00 $9,241.83
IIX $12,486,599.00 5.0000000000% 5.0000000000% $4,235,527.20 $17,648.03 $0.00 $0.00 $0.00 $0.00 $0.00 $17,648.03
IP $1,101,174.80 0.0000000000% 0.0000000000% $873,587.16 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00
IIP $96,394.50 0.0000000000% 0.0000000000% $85,234.38 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00
CB1 $9,418,327.00 5.5511353732% 5.5511353732% $9,103,851.72 $42,113.93 $0.00 $0.00 $0.00 $0.00 $0.00 $42,113.93
CB2 $4,520,574.00 5.5511353732% 5.5511353732% $4,369,633.31 $20,213.69 $0.00 $0.00 $0.00 $0.00 $0.00 $20,213.69
CB3 $3,013,716.00 5.5511353732% 5.5511353732% $2,913,088.88 $13,475.79 $0.00 $0.00 $0.00 $0.00 $0.00 $13,475.79
CB4 $1,130,143.00 5.5511353732% 5.5511353732% $1,092,407.83 $5,053.42 $0.00 $0.00 $0.00 $0.00 $0.00 $5,053.42
CB5 $1,130,143.00 5.5511353732% 5.5511353732% $1,092,407.83 $5,053.42 $0.00 $0.00 $0.00 $0.00 $0.00 $5,053.42
CB6 $1,506,857.67 5.5511353732% 5.5511353732% $1,456,544.15 $6,737.89 $0.00 $0.00 $0.00 $0.00 $0.00 $6,737.89
R $100.00 0.0000000000% 0.0000000000% $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00
R_SYN $0.00 0.0000000000% 0.0000000000% $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00
Total $753,428,929.97     $277,001,543.09 $1,295,899.95 $0.00 $0.00 $0.00 $0.00 $0.00 $1,295,899.95



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS3
Distribution Date: 09/27/2004
PER $1000 DENOMINATION
Class Orig Face Int Rate Accrued Int Rate Paid Beg Cert Prin/Not Bal Curent Int Accrued Int Shortfall PPIS Uncompensated Int Shortfall Unscheduled Int Int Reimbursed Total Int Dist
IA1 $300,000,000.00 5.7500000000% 5.7500000000% 56.67131837 0.27155007 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.27155007
IA2 $25,000,000.00 5.7500000000% 5.7500000000% 1,000.00000000 4.79166680 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.79166680
IA3 $1,000,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58333000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58333000
IA4 $46,000,000.00 5.7500000000% 5.7500000000% 1,000.00000000 4.79166674 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.79166674
IA5 $6,992,000.00 5.7500000000% 5.7500000000% 1,000.00000000 4.79166619 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.79166619
IA6 $1,000,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58333000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58333000
IA7 $1,000,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58333000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58333000
IA8 $1,000,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58333000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58333000
IA9 $1,000,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58333000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58333000
IA10 $1,000,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58333000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58333000
IA11 $1,000,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58333000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58333000
IA12 $1,000,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58333000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58333000
IA13 $1,000,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58333000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58333000
IA14 $1,000,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58333000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58333000
IA15 $3,000,000.00 5.7500000000% 5.7500000000% 1,000.00000000 4.79166667 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.79166667
IA16 $3,000,000.00 5.7500000000% 5.7500000000% 1,000.00000000 4.79166667 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.79166667
IA17 $3,000,000.00 5.7500000000% 5.7500000000% 1,000.00000000 4.79166667 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.79166667
IA18 $3,000,000.00 5.7500000000% 5.7500000000% 1,000.00000000 4.79166667 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.79166667
IA19 $1,500,000.00 6.0000000000% 6.0000000000% 1,000.00000000 5.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 5.00000000
IA20 $1,500,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58333333 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58333333
IA21 $1,086,956.52 5.7500000000% 5.7500000000% 1,000.00000000 4.79166361 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.79166361
IA22 $50,627,000.00 5.7500000000% 5.7500000000% 170.46087957 0.81679163 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.81679163
IA23 $25,059,375.00 4.5000000000% 4.5000000000% 190.41287782 0.71404814 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.71404814
IA24 $24,850,000.00 5.7500000000% 5.7500000000% 1,000.00000000 4.79166680 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.79166680
IA25 $11,390,625.00 2.2250000000% 2.2250000000% 190.41287901 0.35305701 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.35305701
IA26 $11,390,625.00 6.2750000000% 6.2750000000% 190.41287901 0.99570041 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.99570041
IA27 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA28 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA29 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA30 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA31 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS3
Distribution Date: 09/27/2004
PER $1000 DENOMINATION
Class Orig Face Int Rate Accrued Int Rate Paid Beg Cert Prin/Not Bal Curent Int Accrued Int Shortfall PPIS Uncompensated Int Shortfall Unscheduled Int Int Reimbursed Total Int Dist
IA32 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA33 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA34 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA35 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA36 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA37 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA38 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA39 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA40 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA41 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA42 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA43 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA44 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA45 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA46 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA47 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA48 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA49 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA50 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA51 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA52 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA53 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA54 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA55 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA56 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA57 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA58 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA59 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA60 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA61 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500
IA62 $400,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58332500 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58332500



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS3
Distribution Date: 09/27/2004
PER $1000 DENOMINATION
Class Orig Face Int Rate Accrued Int Rate Paid Beg Cert Prin/Not Bal Curent Int Accrued Int Shortfall PPIS Uncompensated Int Shortfall Unscheduled Int Int Reimbursed Total Int Dist
IA63 $600,000.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58333333 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58333333
IIA1 $125,395,000.00 5.2500000000% 5.2500000000% 399.82102500 1.74921695 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.74921695
IIA2 $52,370,500.00 4.5000000000% 4.5000000000% 399.82102462 1.49932882 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.49932882
IIA3 $327,000.00 4.5000000000% 4.5000000000% 399.82103976 1.49932722 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.49932722
IIA4 $10,000,000.00 4.5000000000% 4.5000000000% 399.82102400 1.49932900 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.49932900
IIA5 $3,500,000.00 5.0000000000% 5.0000000000% 399.82102857 1.66592000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.66592000
IIA6 $10,000,000.00 5.0000000000% 5.0000000000% 399.82102400 1.66592100 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.66592100
IX $6,779,035.00 5.7500000000% 5.7500000000% 284.51391828 1.36329581 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.36329581
IIX $12,486,599.00 5.0000000000% 5.0000000000% 339.20583179 1.41335763 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.41335763
IP $1,101,174.80 0.0000000000% 0.0000000000% 793.32287662 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000
IIP $96,394.50 0.0000000000% 0.0000000000% 884.22451488 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000
CB1 $9,418,327.00 5.5511353732% 5.5511353732% 966.61028227 4.47148735 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.47148735
CB2 $4,520,574.00 5.5511353732% 5.5511353732% 966.61028223 4.47148747 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.47148747
CB3 $3,013,716.00 5.5511353732% 5.5511353732% 966.61028445 4.47148636 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.47148636
CB4 $1,130,143.00 5.5511353732% 5.5511353732% 966.61026967 4.47148724 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.47148724
CB5 $1,130,143.00 5.5511353732% 5.5511353732% 966.61026967 4.47148724 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.47148724
CB6 $1,506,857.67 5.5511353732% 5.5511353732% 966.61030368 4.47148403 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.47148403
R $100.00 0.0000000000% 0.0000000000% 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000
R_SYN $0.00 0.0000000000% 0.0000000000% 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2004 DISTRIBUTION REPORT
SERIES: WAMMS 03MS3
WEIGHTED AVERAGE PC RATE: 5.78176%
WEIGHTED AVERAGE MATURITY: 332.73305
WEIGHTED AVERAGE LOAN AGE: 21.56264
POOL NUMBER: 2039
ISSUE DATE: 02/28/2003
CERTIFICATE BALANCE AT ISSUE: $546,036,501.19
  TOTAL NUMBER
OF MORTAGES 		CERTIFICATE ACCOUNT
ACTIVITY (@ PCRATE) 		CERTIFICATE BALANCE
OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END: 438   $191,004,925.34
PRINCIPAL POOL COLLECTION(S):      
Scheduled Principal Collection Due Current Month   $214,341.08  
Unscheduled Principal Collection/Reversals   $29,044.35  
Liquidations-in-full 10 $3,878,082.95  
Subsequent Recoveries   $0.00  
Net principal Distributed   $4,121,468.38 -$4,121,468.38
 
CAPITAL LOSS (PRINCIPAL WRITTEN OFF):     $0.00
 
BALANCE CURRENT FISCAL MONTH-END: 428   $186,883,456.96
 
SCHEDULED INTEREST AT MORTGAGE RATE:   $1,006,480.31  
 
UNSCHEDULED INTEREST AT MORTGAGE RATE:      
Unscheduled Interest Collection/Reversals   $0.00  
Interest Uncollected on Liquidation   $0.00  
Interest Uncollected on Non-Earning Assets   $0.00  
Interest Uncollected on Prepayment   $0.00  
Uncompensated Uncollected Interest   $0.00  
Net Unscheduled Interest Distributed   $0.00  
 
OTHER:      
Loan Conversion Fees   $0.00  
Expense Reimbursements   $0.00  
Gain on Liquidations   $0.00  
Hazard Insurance Premium Refunds   $0.00  
Recoveries Carried Forward   $0.00  
Net Other Distributions   $0.00  



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2004 DISTRIBUTION REPORT
  TOTAL NUMBER
OF MORTAGES 		CERTIFICATE ACCOUNT
ACTIVITY (@ PCRATE) 		CERTIFICATE BALANCE
OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:   $86,192.63  
 
UNSCHEDULED SERVICING FEES:      
Unscheduled Service Fee Collections/Reversals   $0.00  
Servicing Fees Uncollected on Liquidation   $0.00  
Servicing Fees Uncollected/Non-Earning Assets   $0.00  
Net Unscheduled Service Fees Distributed   $0.00  
 
MISCELLANEOUS EXPENSES:   $0.00  
 
NET FUNDS DISTRIBUTED:   $5,041,756.06  



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2004 DISTRIBUTION REPORT
SERIES: WAMMS 03MS3
WEIGHTED AVERAGE PC RATE: 5.24131%
WEIGHTED AVERAGE MATURITY: 155.11522
WEIGHTED AVERAGE LOAN AGE: 20.99122
POOL NUMBER: 2040
ISSUE DATE: 02/28/2003
CERTIFICATE BALANCE AT ISSUE: $207,392,428.78
  TOTAL NUMBER
OF MORTAGES 		CERTIFICATE ACCOUNT
ACTIVITY (@ PCRATE) 		CERTIFICATE BALANCE
OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END: 206   $85,996,617.76
PRINCIPAL POOL COLLECTION(S):      
Scheduled Principal Collection Due Current Month   $374,572.71  
Unscheduled Principal Collection/Reversals   $107,626.32  
Liquidations-in-full 4 $1,320,147.34  
Subsequent Recoveries   $0.00  
Net principal Distributed   $1,802,346.37 -$1,802,346.37
 
CAPITAL LOSS (PRINCIPAL WRITTEN OFF):     $0.00
 
BALANCE CURRENT FISCAL MONTH-END: 202   $84,194,271.39
 
SCHEDULED INTEREST AT MORTGAGE RATE:   $412,660.25  
 
UNSCHEDULED INTEREST AT MORTGAGE RATE:      
Unscheduled Interest Collection/Reversals   $0.00  
Interest Uncollected on Liquidation   $0.00  
Interest Uncollected on Non-Earning Assets   $0.00  
Interest Uncollected on Prepayment   $0.00  
Uncompensated Uncollected Interest   $0.00  
Net Unscheduled Interest Distributed   $0.00  
 
OTHER:      
Loan Conversion Fees   $0.00  
Expense Reimbursements   $0.00  
Gain on Liquidations   $0.00  
Hazard Insurance Premium Refunds   $0.00  
Recoveries Carried Forward   $0.00  
Net Other Distributions   $0.00  



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2004 DISTRIBUTION REPORT
  TOTAL NUMBER
OF MORTAGES 		CERTIFICATE ACCOUNT
ACTIVITY (@ PCRATE) 		CERTIFICATE BALANCE
OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:   $37,048.09  
 
UNSCHEDULED SERVICING FEES:      
Unscheduled Service Fee Collections/Reversals   $0.00  
Servicing Fees Uncollected on Liquidation   $0.00  
Servicing Fees Uncollected/Non-Earning Assets   $0.00  
Net Unscheduled Service Fees Distributed   $0.00  
 
MISCELLANEOUS EXPENSES:   $0.00  
 
NET FUNDS DISTRIBUTED:   $2,177,958.53  



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2004 DISTRIBUTION REPORT
SERIES: WAMMS 03MS3
WEIGHTED AVERAGE PC RATE: 5.61398%
WEIGHTED AVERAGE MATURITY: 277.56657
WEIGHTED AVERAGE LOAN AGE: 21.38516
POOL NUMBER: Group 1
ISSUE DATE: 02/28/2003
CERTIFICATE BALANCE AT ISSUE: $753,428,929.97
  TOTAL NUMBER
OF MORTAGES 		CERTIFICATE ACCOUNT
ACTIVITY (@ PCRATE) 		CERTIFICATE BALANCE
OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END: 644   $277,001,543.10
PRINCIPAL POOL COLLECTION(S):      
Scheduled Principal Collection Due Current Month   $588,913.79  
Unscheduled Principal Collection/Reversals   $136,670.67  
Liquidations-in-full 14 $5,198,230.29  
Subsequent Recoveries   $0.00  
Net principal Distributed   $5,923,814.75 -$5,923,814.75
 
CAPITAL LOSS (PRINCIPAL WRITTEN OFF):     $0.00
 
BALANCE CURRENT FISCAL MONTH-END: 630   $271,077,728.35
 
SCHEDULED INTEREST AT MORTGAGE RATE:   $1,419,140.56  
 
UNSCHEDULED INTEREST AT MORTGAGE RATE:      
Unscheduled Interest Collection/Reversals   $0.00  
Interest Uncollected on Liquidation   $0.00  
Interest Uncollected on Non-Earning Assets   $0.00  
Interest Uncollected on Prepayment   $0.00  
Uncompensated Uncollected Interest   $0.00  
Net Unscheduled Interest Distributed   $0.00  
 
OTHER:      
Loan Conversion Fees   $0.00  
Expense Reimbursements   $0.00  
Gain on Liquidations   $0.00  
Hazard Insurance Premium Refunds   $0.00  
Recoveries Carried Forward   $0.00  
Net Other Distributions   $0.00  



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2004 DISTRIBUTION REPORT
  TOTAL NUMBER
OF MORTAGES 		CERTIFICATE ACCOUNT
ACTIVITY (@ PCRATE) 		CERTIFICATE BALANCE
OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:   $123,240.72  
 
UNSCHEDULED SERVICING FEES:      
Unscheduled Service Fee Collections/Reversals   $0.00  
Servicing Fees Uncollected on Liquidation   $0.00  
Servicing Fees Uncollected/Non-Earning Assets   $0.00  
Net Unscheduled Service Fees Distributed   $0.00  
 
MISCELLANEOUS EXPENSES:   $0.00  
 
NET FUNDS DISTRIBUTED:   $7,219,714.59  



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2004 DISTRIBUTION REPORT
SERIES: WAMMS 03MS3
WEIGHTED AVERAGE PC RATE: 5.61398%
WEIGHTED AVERAGE MATURITY: 277.56657
WEIGHTED AVERAGE LOAN AGE: 21.38516
POOL NUMBER: ALL
ISSUE DATE: 02/28/2003
CERTIFICATE BALANCE AT ISSUE: $753,428,929.97
  TOTAL NUMBER
OF MORTAGES 		CERTIFICATE ACCOUNT
ACTIVITY (@ PCRATE) 		CERTIFICATE BALANCE
OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END: 644   $277,001,543.10
PRINCIPAL POOL COLLECTION(S):      
Scheduled Principal Collection Due Current Month   $588,913.79  
Unscheduled Principal Collection/Reversals   $136,670.67  
Liquidations-in-full 14 $5,198,230.29  
Subsequent Recoveries   $0.00  
Net principal Distributed   $5,923,814.75 -$5,923,814.75
 
CAPITAL LOSS (PRINCIPAL WRITTEN OFF):     $0.00
 
BALANCE CURRENT FISCAL MONTH-END: 630   $271,077,728.35
 
SCHEDULED INTEREST AT MORTGAGE RATE:   $1,419,140.56  
 
UNSCHEDULED INTEREST AT MORTGAGE RATE:      
Unscheduled Interest Collection/Reversals   $0.00  
Interest Uncollected on Liquidation   $0.00  
Interest Uncollected on Non-Earning Assets   $0.00  
Interest Uncollected on Prepayment   $0.00  
Uncompensated Uncollected Interest   $0.00  
Net Unscheduled Interest Distributed   $0.00  
 
OTHER:      
Loan Conversion Fees   $0.00  
Expense Reimbursements   $0.00  
Gain on Liquidations   $0.00  
Hazard Insurance Premium Refunds   $0.00  
Recoveries Carried Forward   $0.00  
Net Other Distributions   $0.00  



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2004 DISTRIBUTION REPORT
  TOTAL NUMBER
OF MORTAGES 		CERTIFICATE ACCOUNT
ACTIVITY (@ PCRATE) 		CERTIFICATE BALANCE
OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:   $123,240.72  
 
UNSCHEDULED SERVICING FEES:      
Unscheduled Service Fee Collections/Reversals   $0.00  
Servicing Fees Uncollected on Liquidation   $0.00  
Servicing Fees Uncollected/Non-Earning Assets   $0.00  
Net Unscheduled Service Fees Distributed   $0.00  
 
MISCELLANEOUS EXPENSES:   $0.00  
 
NET FUNDS DISTRIBUTED:   $7,219,714.59  



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS3
Distribution Date: 09/27/2004
 
Distribution by Group
Pool ID Principal Interest Total  
Pool - 2039 $4,121,468.38 $920,287.68 $5,041,756.06  
Pool - 2040 $1,802,346.37 $375,612.16 $2,177,958.53  
Group 1 $5,923,814.75 $1,295,899.84 $7,219,714.59  
Aggregate $5,923,814.75 $1,295,899.84 $7,219,714.59  
 
Number of Loans and Aggregate Principal Balance By Group
Pool ID Beg Bal Beg Count Paid Off / Liq Count Rem Count Sched Prin End Bal Sched Prin Prin PrePay / Liq Unsched Prin / Rev Total Prin
Pool - 2039 $191,004,925.34 438 10 428 $186,883,456.96 $214,341.08 $3,878,082.95 $29,044.35 $4,121,468.38
Pool - 2040 $85,996,617.76 206 4 202 $84,194,271.39 $374,572.71 $1,320,147.34 $107,626.32 $1,802,346.37
Group 1 $277,001,543.10 644 14 630 $271,077,728.35 $588,913.79 $5,198,230.29 $136,670.67 $5,923,814.75
Aggregate $277,001,543.10 644 14 630 $271,077,728.35 $588,913.79 $5,198,230.29 $136,670.67 $5,923,814.75
 
Delinquency Information by Group
Pool ID 1 Month Count Sched End Balance 2 Months Count Sched End Balance 3 Months Count Sched End Balance 4 Months Count Sched End Balance  
Pool - 2039 4 $1,858,000.14 1 $355,432.84 0 $0.00 0 $0.00  
Pool - 2040 2 $784,491.11 1 $325,002.32 0 $0.00 0 $0.00  
Group 1 6 $2,642,491.25 2 $680,435.16 0 $0.00 0 $0.00  
Aggregate 6 $2,642,491.25 2 $680,435.16 0 $0.00 0 $0.00  
 
Foreclosure and REO Information by Group
Pool ID Foreclosure Count Sched End Balance REO Count Sched End Balance
Pool - 2039 0 $0.00 0 $0.00
Pool - 2040 0 $0.00 0 $0.00
Group 1 0 $0.00 0 $0.00
Aggregate 0 $0.00 0 $0.00
 
Aggregate Loss Amounts by Group
Pool ID Count Loss Amount  
Pool - 2039 0 $0.00  
Pool - 2040 0 $0.00  
Group 1 0 $0.00  
Aggregate 0 $0.00  



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS3
Distribution Date: 09/27/2004
 
INSURANCE RESERVES - Group 1
Insurance Type Original Balance Claims In Progress Claims Paid Coverage Adjustments Coverage Remaining
MPI $0.00 $0.00 $0.00 $0.00 $0.00
Special Hazard $7,534,289.00 $0.00 $0.00 $0.00 $7,534,289.00
Bankruptcy Bond
Single-Units $146,991.00 $0.00 $0.00 $0.00 $146,991.00
Multi-Units $0.00 $0.00 $0.00 $0.00 $0.00
Mortgage Repurchase $7,534,289.00 $0.00 $0.00 $0.00 $7,534,289.00
 
INSURANCE RESERVES - Aggregate
Insurance Type Original Balance Claims In Progress Claims Paid Coverage Adjustments Coverage Remaining
MPI $0.00 $0.00 $0.00 $0.00 $0.00
Special Hazard $7,534,289.00 $0.00 $0.00 $0.00 $7,534,289.00
Bankruptcy Bond
Single-Units $146,991.00 $0.00 $0.00 $0.00 $146,991.00
Multi-Units $0.00 $0.00 $0.00 $0.00 $0.00
Mortgage Repurchase $7,534,289.00 $0.00 $0.00 $0.00 $7,534,289.00



WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS3
Distribution Date: 09/27/2004
 
The Group C-B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I and II Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated February 26, 2003 to that certain Prospectus Supplement, dated November 21, 2002, to which certain Group I and II Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the C-B certificates provide coverage to the Group I and II Loans, subject to the conditions and limitations to payment specified thereunder.
 
The Class Principal Balances of each Class of the Class CB1,CB2,CB3,CB4,CB5,CB6 Certificatesimmediately after the principal and interest distribution on 200409 are as follows:
Class Class Principal Balance
CB1 $9,085,835.80
CB2 $4,360,986.10
CB3 $2,907,324.07
CB4 $1,090,246.03
CB5 $1,090,246.03
CB6 $1,453,661.76
Total $19,988,299.78
Capitalized items used but not defined herein have the meanings ascribed to them in the Prospectus Supplement.
The amount of the special hazard coverage, bankruptcy coverage, and fraud coverage, as of the above referenced distribution date, is $7,534,289.00, $146,991.00, $7,534,289.00 respectively, and such coverages are referred to in the table above under the column "Insurance Type" as "special hazard," "bankruptcy bond," and "mortgage repurchase," respectively. However, no policy of insurance exists for any such coverage, notwithstanding the reference to "insurance."


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