ABK Ambac Financial Grp. Common Stock

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): March 17, 2008 (March 17, 2008)

One State Street Plaza, New York, New York 10004
(Address of principal executive offices) (Zip Code)

(212) 668-0340
(Registrant's telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a -12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d -2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e -4c))

      The following amends and supplements the disclosure on page S-101 under the heading “Certain United States Federal Income Tax Consequences—U.S. Holders—Senior Notes” of the Ambac Financial Group, Inc. Prospectus Supplement dated March 6, 2008 (the “Prospectus Supplement”) to the Prospectus dated January 16, 2008 in regard to the sale of 5,000,000 Equity Units:

      Consistent with the terms of the senior notes, which provide for semi-annual payments of interest after a successful remarketing, the projected payment on the senior notes for U.S. Federal income tax purposes is $2.48 for each semi-annual period ending after February 15, 2011 (not each quarter ending after February 15, 2011 as stated on page S-101 of the Prospectus Supplement) . The issue price and yield to maturity remain $45.7938 and 11%, respectively, and therefore the U.S. federal income tax consequences to holders of the senior notes are unchanged. As noted in the Prospectus Supplement, if the actual payments of interest and principal differ from the projected payment schedule, we will account for any such difference as a positive or negative adjustment to income for that period.

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