Aspen Announces Appointment of Mario P. Vitale as co-CEO of Aspen Insurance

Hamilton, Bermuda – 17 October, 2011 – Aspen Insurance Holdings Limited (“Aspen” or the “Company”; Ticker: NYSE:AHL; BSX: AHL.BH) announces that  Mario P. Vitale will be appointed as co-CEO of Aspen Insurance with effect from 01 January, 2012, when John Cavoores steps down from the role. This appointment is in addition to Mr. Vitale's current responsibility as President of Aspen US Insurance.  In his new role, Mr. Vitale will work jointly with Rupert Villers, co-CEO of Aspen Insurance in developing Aspen's insurance operations.  Mr. Cavoores will remain a Director of Aspen.

Chris O'Kane, Chief Executive Officer, commented: "I would like to thank John for his very considerable achievements since taking on an executive role at Aspen as co-CEO of Insurance in October last year.  He has strengthened our US insurance operations in particular and provided a firm foundation from which to build our presence in the US market. He has also made a significant contribution to the Company's overall development both as a director since October 2006 and during his executive tenure. I am very pleased that John will remain as a Director on the Aspen board and I look forward to his continued contribution."

He further commented: "Mario has made significant progress in executing our US insurance strategy since joining the Company earlier this year and he will make a strong contribution to the continued evolution of our insurance franchise working with Rupert Villers."

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, 2010, the Company reported gross written premiums of $2,076.8 million, net income of $312.7 million and total assets of $8.8 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.

CONTACT:

Investor Contacts:

Aspen Insurance Holdings Limited

Kerry Calaiaro, Senior Vice President, Investor Relations     T: +1 646 502 1076

Kerry.Calaiaro@aspen.bm

European Press Contact:

Citigate Dewe Rogerson

Justin Griffiths                                                 T:   +44 (0) 20 7638 9571

North American Press Contact:

Abernathy MacGregor

Carina Davidson/Allyson Morris                     T: +1 212 371 5999