WaMu Second Quarter 2008 Earnings Release and Conference Call

Washington Mutual, Inc. (NYSE: WM) will release its second quarter 2008 earnings on Tuesday, July 22, 2008, following the close of the New York Stock Exchange. WaMu CEO Kerry Killinger and CFO Tom Casey will review WaMu’s second quarter results by telephone and live audio webcast beginning at 5 p.m. ET. The earnings release and additional materials will be available on the Internet at wamu.com/ir. To participate, please access one of the following 10 minutes prior to the live event: Dial-In Number: 1-888-324-6919 for U.S. callers 1-312-470-7289 for International callers Access code: WaMu Internet: The live and archived audio webcast will be accessible by clicking on the link to the Q2 2008 Earnings Conference Call at wamu.com/ir. The telephone replay will be available approximately one hour following the conclusion of the live event and continuing through 11:59 p.m. ET on Friday, August 1, 2008. To listen to the replay, dial 1-888-568-0151 for U.S. callers and 1-203-369-3462 for International callers. About WaMu WaMu, through its subsidiaries, is one of the nation’s leading consumer and small business banks. At March 31, 2008, WaMu and its subsidiaries had assets of $319.67 billion. The company has a history dating back to 1889 and its subsidiary banks currently operate approximately 2,500 consumer and small business banking stores throughout the nation. WaMu’s financial reports and news releases are available at wamu.com/ir.