Aspen Insurance Holdings Limited Announces Completion of Ordinary Share Offering by Shareholders

Hamilton, Bermuda: July 3, 2007 €” Aspen Insurance Holdings Limited ("Aspen") (NYSE:AHL) announced today that two of its shareholders, The Blackstone Group and DLJ Merchant Banking Partners, have completed their sale of 5,707,625 ordinary shares of Aspen and 2,219,668 ordinary shares of Aspen, respectively, in an underwritten public offering. The Blackstone Group and DLJ Merchant Banking Partners, a private equity investment affiliate of Credit Suisse, no longer own any shares of Aspen. 

Credit Suisse acted as the sole book-running manager for the offering. Credit Suisse will offer Aspen's ordinary shares from time to time for sale in one or more transactions on the NYSE, in the over-the-counter market, through negotiated transactions or otherwise at market prices prevailing at the time of sale, at prices related to prevailing market prices or at negotiated prices. Aspen will not receive any proceeds from the sale of ordinary shares by The Blackstone Group and DLJ Merchant Banking Partners.

The ordinary shares were sold pursuant to Aspen's effective shelf registration statement previously filed with the Securities and Exchange Commission. A prospectus supplement relating to the ordinary shares offering was filed with the Securities Exchange Commission. A written prospectus for the offering meeting the requirements of Section 10 of the Securities Act of 1933, as amended, may be obtained from Credit Suisse by contacting Credit Suisse Securities (USA) LLC, Prospectus Department, at One Madison Avenue, New York, NY 10010, telephone (800) 221-1037.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of these securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. Any offering of ordinary shares will be made only by means of a written prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended.

About Aspen Insurance Holdings Limited

Aspen Insurance Holdings Limited 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 the United States and specialty insurance and reinsurance consisting mainly of marine and energy and aviation worldwide. Aspen's operations are conducted through its wholly-owned subsidiaries located in London, Bermuda and the United States: Aspen Insurance UK Limited, Aspen Insurance Limited and Aspen Specialty Insurance Company. Aspen has four operating segments: property reinsurance, casualty reinsurance, specialty insurance and reinsurance and property and casualty insurance. For more information about Aspen, please visit Aspen's website at www.aspen.bm.