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): AUGUST 3, 2004 ASPEN INSURANCE HOLDINGS LIMITED (Exact name of registrant as specified in its charter) BERMUDA 001-31909 NOT APPLICABLE (State or other jurisdiction (Commission (I.R.S. Employer of incorporation) File Number) Identification No.) VICTORIA HALL 11 VICTORIA STREET HAMILTON HM 11 BERMUDA (Address of principal executive offices) (Zip Code) Registrant's telephone number, including area code: (441) 295-8201 NOT APPLICABLE (Former name or former address, if changed since last report) ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS The following exhibit is furnished as part of this report: 99.1 Press Release of the Registrant, dated August 3, 2004. ITEM 9. REGULATION FD DISCLOSURE On August 3, 2004, Aspen Insurance Holdings Limited issued a press release announcing second quarter results and results for the six months ended June 30, 2004, which has been attached as Exhibit 99.1. ITEM 12. RESULTS OF OPERATIONS AND FINANCIAL CONDITION On August 3, 2004, Aspen Insurance Holdings Limited issued a press release announcing second quarter results and results for the six months ended June 30, 2004, which has been attached as Exhibit 99.1. The information furnished under Item 9 "Regulation FD Disclosure" and Item 12 "Results of Operations and Financial Condition" shall not be deemed "filed" for purpose of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing. 2 SIGNATURE 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. ASPEN INSURANCE HOLDINGS LIMITED (Registrant) Dated: August 5, 2004 By: /s/ Julian Cusack ----------------------------------- Name: Julian Cusack Title: Chief Financial Officer 3 INDEX TO EXHIBITS EXHIBIT NO. DESCRIPTION ------------- ----------------------------------------------------------------- 99.1 Press Release of the Registrant dated August 3, 2004. 4