Aspen Insurance Holdings Prices Offering of $250 Million of 6.00% Senior Notes due 2020

Aspen Insurance Holdings Limited (the “Company”) (NYSE:AHL) today announced that it has priced its public offering of $250 million of 6.00% Senior Notes due 2020. The Senior Notes pay interest semi-annually and have a maturity of December 15, 2020. The Company intends to use the net proceeds from the offering for general corporate purposes.

Citigroup Global Markets Inc. and Deutsche Bank Securities Inc. served as joint book-running managers for the offering.

The notes are being offered pursuant to an effective shelf registration statement that has been filed with the U.S. Securities and Exchange Commission (“SEC”). Any offer, or solicitation to buy, if at all, will be made solely by means of a prospectus supplement and accompanying prospectus filed with the SEC. You may get these documents for free by searching the SEC’s on-line database at www.sec.gov. Alternatively, the joint book-running managers will arrange to send you the prospectus supplement and accompanying prospectus if you request it by contacting Citigroup Global Markets Inc. at 1-877-858-5407 or Deutsche Bank Securities Inc. at 1-800-503-4611.

This press release does not constitute an offer to sell or a solicitation of an offer to buy nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

About Aspen Insurance Holdings Limited

The Company provides reinsurance and insurance coverage to clients in various domestic and global markets through wholly-owned subsidiaries and offices in Bermuda, France, Germany, Ireland, Singapore, Switzerland, the United Kingdom and the United States. For the twelve months ended December 31, 2009, The Company reported gross written premiums of $2,067.1 million, net income of $473.9 million and total assets of $8.3 billion. Its operating subsidiaries have been assigned a financial strength rating of “A” (“Strong”) by Standard & Poor's, an “A” (“Excellent”) by A.M. Best and an “A2” (“Good”) by Moody's Investors Service.

Application of the Safe Harbor of the Private Securities Litigation Reform Act of 1995:

This press release contains ‘‘forward-looking statements’’ within the meaning of the U.S. federal securities laws. These statements are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include all statements that do not relate solely to historical or current facts, and can be identified by the use of words such as ‘‘expect,’’ ‘‘intend,’’ ‘‘plan,’’ ‘‘believe,’’ ‘‘project,’’ ‘‘anticipate,’’ ‘‘seek,’’ ‘‘will,’’ ‘‘estimate,’’ ‘‘may,’’ ‘‘continue,’’ ‘‘guidance,’’ and similar expressions of a future or forward-looking nature.

All forward-looking statements rely on a number of assumptions concerning future events and are subject to a number of uncertainties and other factors, many of which are outside the Company’s control, that could cause actual results to differ materially from such statements. For a more detailed description of additional uncertainties and other factors that could impact the forward-looking statements in this release, please see the ‘‘Risk Factors’’ section in the Company’s Annual Report on Form 10-K for the year ended December 31, 2009, filed with the U.S. Securities and Exchange Commission on February 26, 2010.