AHL Aspen Insurance Holdings Limited Ordinary Shares

Aspen Insurance Holdings Limited ("Aspen" or "the Company") (NYSE:AHL) today announced that Aspen received notification it will be added to the Russell 3000� broad-market index and the Russell 2000� small-cap stock market equity index on June 22, 2007. The Russell indexes are widely used by investment managers and institutional investors as benchmarks for both passive and active investment strategies. Chris O�Kane, Aspen�s Chief Executive Officer, commenting on the index inclusions said: �I am pleased that Aspen has been added to the Russell 3000� and the Russell 2000� indexes. With more than $4 trillion in assets benchmarked against the Russell indexes, Aspen�s membership in two of the largest Russell indexes provides new routes for investors to access our stock.� Membership in the Russell 3000� and the Russell 2000� remain in place for one year, and the Russell 3000� serves as the U.S. component of the Russell Global Index. Russell determines membership for its equity indexes primarily by objective, market capitalization and style attributes. About Aspen Insurance Holdings Limited 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 Re�), 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 the Company�s website at www.aspen.bm. Application of the Safe Harbor of the Private Securities Litigation Reform Act of 1995 This press release contains written, and Aspen�s officers may make related oral, �forward-looking statements� within the meaning of the U.S. federal securities laws regarding Aspen's membership in the Russell indexes. 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,� and similar expressions of a future or forward-looking nature. All forward-looking statements rely on a number of assumptions, estimates and data concerning future results and events and are subject to a number of uncertainties and other factors, many of which are outside Aspen�s control that could cause actual results to differ materially from such statements. For a detailed description of uncertainties and other factors that could impact the forward-looking statements in this release, please see the �Risk Factors� section in Aspen�s Annual Report on Form 10-K for the year ended December 31, 2006, filed with the U.S. Securities and Exchange Commission on February 22, 2007.