Washington Mutual Mortgage Securities Corp – ‘424B3’ on 6/27/03 re: Wamu Mortgage Pass Through Certificates Series 2003-AR7

On:  Friday, 6/27/03, at 4:59pm ET   ·   Accession #:  950117-3-2762   ·   File #s:  333-103345, -14

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Prospectus   —   Rule 424(b)(3)
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 424B3       Washington Mutual                                      2±     9K 

424B3
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SUPPLEMENT TO PROSPECTUS SUPPLEMENT DATED JUNE 20, 2003 
(TO PROSPECTUS DATED MAY 20, 2003)

WAMU MORTGAGE PASS-THROUGH CERTIFICATES,
SERIES 2003-AR7 

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. 
DEPOSITOR AND MASTER SERVICER 

$1,772,926,100
(APPROXIMATE) 

The first paragraph under the heading 'Method of Distribution' and the  
tables that follow on pages S-55 and S-56 are amended and restated in their     
entirety as follows:                                                            

     Washington Mutual Mortgage Securities Corp. has agreed to sell to the
underwriters, and the underwriters have agreed to purchase, all of the  
   offered certificates (other than the 0.01% percentage interest of the Class
    R Certificates that Washington Mutual Mortgage Securities Corp. will retain)
 in the principal amounts (or notional amounts, in the case of the Class X
Certificates) set forth below.                                          

                                                        [Enlarge/Download Table]

                                  CLASS A-1     CLASS A-2      CLASS A-3      CLASS A-4     CLASS A-5     CLASS A-6  
          UNDERWRITER            CERTIFICATES  CERTIFICATES   CERTIFICATES   CERTIFICATES  CERTIFICATES  CERTIFICATES
          -----------            ------------  ------------   ------------   ------------  ------------  ------------
                                                                                                                     
Greenwich Capital Markets,                                                                                           
 Inc............................ $100,660,000  $ 43,260,000  $   69,720,000  $ 46,900,000  $ 44,450,000  $ 97,797,000
Bear, Stearns & Co. Inc......... $ 71,900,000  $ 30,900,000  $   49,800,000  $ 33,500,000  $ 31,750,000  $ 69,854,000
Lehman Brothers Inc............. $ 71,900,000  $ 30,900,000  $   49,800,000  $ 33,500,000  $ 31,750,000  $ 69,854,000
WaMu Capital Corp............... $ 43,140,000  $ 18,540,000  $   29,880,000  $ 20,100,000  $ 19,050,000  $ 41,912,000
                                 ------------  ------------  --------------  ------------  ------------  ------------
   Total........................ $287,600,000  $123,600,000  $  199,200,000  $134,000,000  $127,000,000  $279,417,000

                                                        [Enlarge/Download Table]

                                  CLASS A-7     CLASS A-8       CLASS X       CLASS B-1     CLASS B-2     CLASS B-3  
          UNDERWRITER            CERTIFICATES  CERTIFICATES   CERTIFICATES   CERTIFICATES  CERTIFICATES  CERTIFICATES
          -----------            ------------  ------------   ------------   ------------  ------------  ------------
                                                                                                                     
Greenwich Capital Markets,                                                                                           
 Inc............................ $175,700,000  $ 28,000,000  $  866,408,500  $  9,359,000  $  7,131,000  $  3,565,000
Bear, Stearns & Co. Inc......... $125,500,000  $ 20,000,000        --             --            --            --     
Lehman Brothers Inc............. $125,500,000  $ 20,000,000        --             --            --            --     
WaMu Capital Corp............... $ 75,300,000  $ 12,000,000  $  866,408,500  $  9,359,000  $  7,130,000  $  3,565,000
                                 ------------  ------------  --------------  ------------  ------------  ------------
   Total........................ $502,000,000  $ 80,000,000  $1,732,817,000  $ 18,718,000  $ 14,261,000  $  7,130,000

                                                                [Download Table]

                                   CLASS R     
          UNDERWRITER            CERTIFICATES  
          -----------            ------------  
                                               
Greenwich Capital Markets,                     
 Inc............................     $100      
Bear, Stearns & Co. Inc.........    --         
Lehman Brothers Inc.............    --         
WaMu Capital Corp...............    --         
                                     ----      
   Total........................     $100      

The date of this Supplement is June 24, 2003. 

Dates Referenced Herein   and   Documents Incorporated by Reference

This ‘424B3’ Filing		Date		Other Filings
Filed on:		6/27/03		8-K
		6/24/03
		6/20/03		8-K
		5/20/03		8-K,  8-K/A
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