SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 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): September 19, 2001 (September 18, 2001) AMBAC FINANCIAL GROUP, INC. (Exact Name of Registrant as Specified in Charter) Delaware 1-10777 13-3621676 (State of Other Jurisdiction (Commission File Number) (IRS Employer of Incorporation) Identification No.) 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) N/A (Former name or former address, if changed since last report) Page 1 of 7 Pages ================================================================================ Index to Exhibits on Page 4 Item 5. Other Events. On September 18, 2001, Ambac Financial Group, Inc. (the "Registrant") issued a press release providing additional information related to the World Trade Center tragedy. Exhibit 99.05 is a copy of such press release and is incorporated herein by reference. Item 7. Financial Statements, Pro Forma Financial Information and Exhibits. (c) Exhibits. 99.05 Press release providing additional information related to the World Trade Center tragedy dated September 18, 2001. Page 2 of 7 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. AMBAC FINANCIAL GROUP, INC. Dated: September 19, 2001 By: /s/Frank J. Bivona ------------------ Name: Frank J. Bivona Title Vice Chairman and Chief Financial Officer Page 3 of 7 EXHIBIT INDEX Exhibit No. Description ----------- ----------- 99.05 Press release providing additional information related to the World Trade Center tragedy, dated September 18, 2001. Page 4 of 7