ABK Ambac Financial Grp. Common Stock

Ambac Financial Group, Inc. (NYSE: ABK) (Ambac) today announced that its Board of Directors declared a regular quarterly cash dividend of $0.01 per share of common stock. The dividend is payable on June 4, 2008 to stockholders of record on May 20, 2008. Ambac Financial Group, Inc., headquartered in New York City, is a holding company whose affiliates provide financial guarantees to clients in both the public and private sectors around the world. Ambac's principal operating subsidiary, Ambac Assurance Corporation, a guarantor of public finance and structured finance obligations, has earned triple-A ratings from Moody's Investors Service, Inc. and Standard & Poor's Ratings Services; and a double-A rating from Fitch, Inc. Moody's, Standard & Poor's and Fitch all maintain a �negative outlook�. Ambac Financial Group, Inc. common stock is listed on the New York Stock Exchange (ticker symbol ABK).