Washington Mutual, Inc. $500 million Floating Rate Notes due 2009 $400 million 5.50% Notes due 2011 UNDERWRITING AGREEMENTUnderwriting Agreement • August 24th, 2006 • Washington Mutual Inc • Savings institution, federally chartered • New York
hereinafter referred to as the “Registration Statement”. Each date and time on which the Registration Statement and any post-effective amendment or amendments thereto become or becomes effective is herein referred to as an “Effective Date”. The Registration Statement contains a base prospectus in the form in which it has most recently been filed with the Commission on or prior to the date of this Agreement (the “Base Prospectus”), to be used in connection with the public offering and sale of the Offered Securities. Any preliminary prospectus supplement to the Base Prospectus that describes the Offered Securities and the offering thereof and which is used prior to the filing of the Final Prospectus, together with the Base Prospectus, is hereinafter referred to as the “Preliminary Prospectus”. The Base Prospectus together with the prospectus supplement relating to the Offered Securities that was first filed with the Commission pursuant to Rule 424(b) under the Act after the Execution Tim
