ABK Ambac Financial Grp. Common Stock

Ambac Financial Group, Inc. (NYSE:ABK) announced that it will host a conference call for investors on April 23 at 11 a.m. Eastern to discuss first quarter 2008 earnings which are scheduled to be released at 6 a.m. that morning. The dial in number for the call is 877-407-0782 (U.S.) and 201-689-8567 (outside the U.S.). Participants may submit questions in advance of the call by sending an email to 1Q2008earnings@ambac.com The conference call will also be broadcast live on Ambac�s website at �www.ambac.com�. Beginning at 2 p.m. on April 23 through May 7, the conference call will be available in replay. The replay numbers are 877-660-6853 (U.S.) and 201-612-7415 (outside the U.S.). The account and confirmation numbers for the replay are 286 and 281552, respectively. A recording will also be available on Ambac�s web site approximately one hour after the end of the conference call. 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 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).