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ASPEN RE RENEWS SILVERTON FOR 2015

22 December 2014

Hamilton, Bermuda – 22 December, 2014 – Aspen Reinsurance (“Aspen Re”), the reinsurance segment of Aspen Insurance Holdings Limited (“Aspen” or the “Company”; Ticker: NYSE:AHL; BSX: AHL.BH), announces that its Aspen Capital Markets division has renewed Silverton Re for 2015.

Silverton Re is a Bermuda-domiciled special purpose insurer which was established in December 2013 to provide additional collateralized capacity to support Aspen Re’s global reinsurance business.

Silverton Re has been renewed for 2015 with $85 million of capital being raised to write a quota share of Aspen Re’s property catastrophe portfolio, which compares with the $65 million of capital raised at launch in December 2013. US$15 million of the funding is provided by Aspen and additional funding is secured from third-party investors. Aon Benfield Securities, Inc. acted as the placement agent. The capital is being raised through the issuance of Series 2015-1 Participating Notes which will mature on September 18, 2017.

Silverton Re will enter into a quota share retrocession agreement with Aspen Bermuda Limited under which Silverton Re will reinsure a proportionate share of Aspen Re’s globally diversified property catastrophe excess of loss portfolio.

Stephen Postlewhite, Chief Executive Officer, Aspen Re, said: “Our objective when we established Silverton Re was to partner with the capital markets so that we are able to provide investors with access to diversified natural catastrophe risk backed by the distribution, underwriting, analysis and research expertise of Aspen Re. We are pleased with the progress that we have made in developing strong partnerships with new investors.”

This release is not an offer of securities for sale into the United States or elsewhere. No securities may be offered or sold in the United States absent registration or an exemption from, or in a transaction not subject to, the registration requirements of the U.S. Securities Act of 1933, as amended (the “Securities Act”), including pursuant to the private offering exemption provided by Section 4(a)(2) of the Securities Act and the provisions of Regulation D promulgated thereunder.

NOTES TO EDITORS:

About Aspen Reinsurance (“Aspen Re”)

Aspen Re is a business segment of Aspen Insurance Holdings Limited with gross written premiums of $1.1 billion in 2013. Aspen Re offers a broad range of specialty reinsurance products and has a global footprint with offices in the United States, Bermuda, the United Kingdom, Switzerland, France, Germany and Singapore.

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 Kingdom and the United States. For the year ended December 31, 2013, Aspen reported $10.2 billion in total assets, $4.7 billion in gross reserves, $3.3 billion in shareholders’ equity and $2.6 billion in gross written premiums. Its operating subsidiaries have been assigned a rating of “A” (“Strong”) by Standard & Poor’s Ratings Services, an “A” (“Excellent”) by A.M. Best Company Inc. and an “A2” (“Good”) by Moody’s Investors Service, Inc.

For further information

Please visit www.aspen.co or contact:

Investors

Kerry Calaiaro, Senior Vice President, Investor Relations, Aspen

Kerry.Calaiaro@aspen.co

+1 (646) 502 1076

Kathleen de Guzman, Vice President, Investor Relations, Aspen

kathleen.deguzman@aspen.co

+1 (646) 289 4912

Media

Steve Colton, Head of Communications, Aspen

Steve.Colton@aspen.co