Aspen Insurance Holdings Limited to Announce 2004 Second Quarter Results on August 3, 2004 and Host Conference Call on August 4, 2004 HAMILTON, Bermuda, June 28 /PRNewswire-FirstCall/ -- Aspen Insurance Holdings Limited (Aspen) (NYSE:AHL)(BSX:AHLBSX:BH) will release its 2004 second quarter financial results on Tuesday, August 3, 2004, following the closing of the U.S. markets. The Company will hold a conference call to discuss its financial results on Wednesday, August 4, 2004 at 8:30 a.m. (New York City time). The conference call will be webcast live on the Investor section of Aspen's web site, which is located at http://www.aspen.bm/. Chris O' Kane, chief executive officer, and Julian Cusack, chief financial officer, will review Aspen's 2004 second quarter financial results. Following their review, questions will be taken from registered analysts and investors. The conference call is expected to last approximately one hour. Investors may participate in the live conference call by dialing 800-473-6123 (toll-free domestic U.S.) or 973-582-2706 (international); passcode: 4914896. Please call to register at least 10 minutes before the conference call begins. A replay of the call will be available for two days via the telephone starting approximately two hours following the live call on August 4, 2004, and can be accessed at 877-519-4471 (toll-free domestic U.S.) or 973-341-3080 (international); passcode: 4914896. About Aspen Insurance Holdings Limited Aspen Insurance Holdings Limited (Aspen) was established in June 2002. Aspen is a Bermudian holding company that provides property and casualty reinsurance in the global market, property and liability insurance principally in the United Kingdom and surplus lines insurance in the United States. Aspen's operations are conducted through its wholly-owned subsidiaries located in London, Bermuda and the United States: Aspen Insurance UK Limited (Aspen Re), Aspen Insurance Limited (Aspen), Aspen Specialty Insurance Company (Aspen Specialty) and Aspen Re America Inc (Aspen Re America). Aspen's reinsurance segment consists of property reinsurance, casualty reinsurance and specialty reinsurance lines of business. Aspen's insurance segment consists of commercial property, commercial liability and U.S. surplus insurance lines of business. Aspen's principal existing shareholders include The Blackstone Group, Candover Partners Limited, Wellington Underwriting plc and Credit Suisse First Boston Private Equity. DATASOURCE: Aspen Insurance Holdings Limited (Aspen) CONTACT: Investor Contacts - Noah Fields, Head of Investor Relations, or Julian Cusack, Chief Financial Officer, both of Aspen Insurance Holdings Limited, +441-297-9382; US Contacts - Carina Thate or Jason Thompson, both of The Abernathy MacGregor Group, +1-212-371-5999, for Aspen Insurance Holdings Limited; UK Contacts - Emma Burdett or Brian Hudspith of The Maitland Consultancy, +44-20-7379-5151, for Aspen Insurance Holdings Limited Web site: http://www.aspen.bm/

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