Lehman Brothers acted as the sole book-running manager for the offering.  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 Lehman Brothers by contacting Lehman Brothers, c/o ADP Financial Services, Prospectus Fulfillment, 1155 Long Island Avenue, Edgewood, NY 11717, email: jennifer_maldonado@adp.com, fax: 631-254-7268.

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. Aspen's principal existing founding shareholders include The Blackstone Group, Candover Partners Limited and DLJ Merchant Banking Partners, a private equity investment affiliate of Credit Suisse. For more information about Aspen, please visit Aspen's website at www.aspen.bm.