The Notice relates to the pendency and proposed settlements of a class action lawsuit against (i) Ambac Financial Group, Inc. (“Ambac” or the “Company”); (ii) certain present or former officers or directors of Ambac; and (iii) Citigroup Global Markets, Inc., UBS Securities LLC, Goldman, Sachs & Co., J.P. Morgan Securities Inc., HSBC Securities (USA) Inc., Merrill Lynch, Pierce, Fenner, & Smith Incorporated, and Wachovia Capital Markets, LLC, now known as Wells Fargo Securities, LLC (collectively, the “Underwriter Defendants”). Also covered by the settlements are nineteen individuals who are named in the Action or one or more related securities or derivative actions. These nineteen individuals are Michael A. Callen (“Callen”), Jill M. Considine (“Considine”), Robert J. Genader (“Genader”), W. Grant Gregory (“Gregory”), Philip B. Lassiter (“Lassiter”), Sean T. Leonard (“Leonard”), Thomas C. Theobald (“Theobald”), John W. Uhlein, III (“Uhlein”), Laura S. Unger (“Unger”), Henry D.G. Wallace (“Wallace”), David W. Wallis (“Wallis”), Gregg L. Bienstock (“Bienstock”), Kevin J. Doyle (“Doyle”), Philip Duff (“Duff”), Thomas J. Gandolfo (“Gandolfo”), Kathleen McDonough (“McDonough”), William T. McKinnon (“McKinnon”), Douglas C. Renfield-Miller (“Renfield-Miller”), and Robert G. Shoback (“Shoback”); (collectively, “Individual Defendants,” and together with Ambac, the “Ambac Defendants”). The Ambac Defendants and the Underwriter Defendants are collectively referred to as the “Settling Defendants.” Plaintiffs and the Settling Defendants are collectively referred to as the “Settling Parties.” The proposed Settlements, if approved by the Court, will settle certain claims of all persons and entities who purchased or otherwise acquired Ambac Securities from October 19, 2005, through and including July 18, 2009 (the “Class Period”).