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Aspen Insurance Holdings to Announce Second Quarter 2010 Results on July 28, 2010 and Host Conference Call on July 29, 2010

23 June 2010

Hamilton, Bermuda, June 23, 2010 – Aspen Insurance Holdings Limited (“Aspen”) (NYSE:AHL) will release its second quarter 2010 financial results on Wednesday, July 28, 2010, following the close of U.S. markets. The Company will hold a conference call to discuss its financial results on Thursday, July 29, 2010 at 8:30 a.m. (Eastern Time).

C ONFERENCE CALL PARTICIPATION DETAILS – July 29, 2010 at 8:30 a.m. (ET)

Participant Dial-In Numbers: +1 (888) 459-5609 (US Toll Free)

+1 (404) 665-9920 (International)

Conference ID: 82798733

Please call to register at least 10 minutes before the conference call begins.

The conference call will be webcast live in the ‘presentations’ section of the Investor Relations page of Aspen's website, which is located at www.aspen.bm. The earnings press release and a detailed financial supplement will be posted to the website, as well as a brief slide presentation which may be used for reference during the earnings call.

REPLAY DETAILS

A replay of the call will be available for 14 days via telephone and Internet starting two hours following the end of the live call.

Replay Access: +1 (800) 642-1687 (US Toll Free)

+1 (706) 645-9291 (International)

www.aspen.bm

Replay ID: 82798733

About Aspen Insurance Holdings Limited

Aspen 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 States and the United Kingdom. For the twelve months ended December 31, 2009, Aspen 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 rating of “A” (“Strong”) by Standard & Poor’s, an “A” (“Excellent”) by A.M. Best and an “A2” (“Good”) by Moody’s Investors Service. For more information about Aspen, please visit www.aspen.bm.

Investor Contact:
Aspen Insurance Holdings Limited

Noah Fields, Head of Investor Relations.................. T: +1 441-297-9382

European Press Contact:
Citigate Dewe Rogerson
Justin Griffiths....................................................... T: +44 (0) 20 7282 2837

North American Press Contact:
Abernathy MacGregor
Carina Davidson/Allyson Morris.............................. T: +1 212-371-5999

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