WaMu
Mortgage Pass-Through Certificates, Series 2003-S4
Washington Mutual
Mortgage Securities Corp.
Depositor and Master
Servicer
$1,333,121,044
(Approximate)
This Supplement to
Prospectus Supplement has been prepared for use by an affiliate of the Registrant in
market-making transactions.
The following paragraph is added
before the final paragraph on page S-1:
This
prospectus supplement and the accompanying prospectus may be used by WaMu Capital Corp. or
another affiliate of Washington Mutual Mortgage Securities Corp. in connection with offers
and sales of an indeterminate amount of the certificates in market-making transactions. In
these transactions, WaMu Capital Corp. or another affiliate may act as principal or agent
and the sales will be made at prices related to prevailing market prices at the time of
sale or otherwise.
The following section is added after
the final paragraph under the heading “Important Notice About Information Presented
in this Prospectus Supplement and the Accompanying Prospectus” on page S-2:
Incorporation of
Documents by Reference
We
“incorporate by reference” into this prospectus supplement the information we
file with the Securities and Exchange Commission with respect to the offered certificates,
which means that we can disclose important information to you by referring you to those
documents. The information we incorporate by reference is considered to be part of this
prospectus supplement from the date it was filed, unless we update or supersede that
information by information we file subsequently that is incorporated by reference into
this prospectus supplement. We incorporate by reference into this prospectus supplement
any documents filed by us with the Securities and Exchange Commission with respect to the
offered certificates under Section 13(a), 13(c), 14 or 15(d) of the Securities Exchange
Act of 1934 after the date of this prospectus supplement and prior to the termination of
the offering of the offered certificates.
Any
statement contained in this prospectus supplement or in a document incorporated or deemed
to be incorporated by reference into this prospectus supplement will be deemed to be
modified or superseded for the purposes of this prospectus supplement to the extent that a
statement contained in any other subsequently filed document which also is or is deemed to
be incorporated by reference into this prospectus supplement modifies or supersedes the
statement. Any statement so modified or superseded shall not be deemed, except as so
modified or superseded, to constitute a part of this prospectus supplement.
We
will provide without charge to each person to whom this prospectus supplement is
delivered, upon written or oral request, copies of any or all of the documents that have
been incorporated by reference into this prospectus supplement. Requests should be
directed to Washington Mutual Mortgage Securities Corp., Attn: Bacc Alexander, 75 North
Fairway Drive, VHJ1C01, Vernon Hills, Illinois60061, Telephone: (847) 393-5686.
The following paragraph is added
after the first paragraph under the heading “Method of Distribution” on page
S-71:
This
prospectus supplement and the accompanying prospectus may be used by WaMu Capital Corp.,
an affiliate of Washington Mutual Mortgage Securities Corp., or another affiliate of
Washington Mutual Mortgage Securities Corp. in connection with offers and sales of an
indeterminate amount of the certificates in market-making transactions. In these
transactions, WaMu Capital Corp. or another affiliate may act as principal or agent and
the sales will be made at prices related to prevailing market prices at the time of sale
or otherwise.
