ABK Ambac Financial Grp. Common Stock

Ambac Financial Group, Inc. Announces Increased Share Buyback Authorization and Declares Quarterly Dividend NEW YORK, May 3 /PRNewswire-FirstCall/ -- Ambac Financial Group, Inc. (NYSE:ABK) today announced that its Board of Directors increased the number of shares available under the Company's Share Repurchase Program by six million shares. Ambac has recently repurchased 1.3 million shares in the open market for approximately $86.7 million. After today's additional authorization, coupled with the recent share purchases, Ambac has approximately 6.3 million shares remaining under its Share Repurchase Program. Shares will be repurchased in the open market or in private transactions at times and prices considered appropriate by Ambac. Ambac also announced today that its Board of Directors declared a regular quarterly cash dividend of $0.125 per share of common stock. The dividend is payable on June 1, 2005 to stockholders of record on May 16, 2005. Ambac Financial Group, Inc., headquartered in New York City, is a holding company whose affiliates provide financial guarantees and financial services to clients in both the public and private sectors around the world. Ambac's principal operating subsidiary, Ambac Assurance Corporation, a leading guarantor of public finance and structured finance obligations, has earned triple-A ratings, the highest ratings available from Moody's Investors Service, Inc., Standard & Poor's Ratings Services, Fitch, Inc. and Rating and Investment Information, Inc. Ambac Financial Group, Inc. common stock is listed on the New York Stock Exchange (ticker symbol ABK). DATASOURCE: Ambac Financial Group, Inc. CONTACT: Investor and Media Contact - Peter R. Poillon of Ambac Financial Group, Inc., +1-212-208-3333, Web site: http://www.ambac.com/

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