Aspen Insurance Holdings to be Acquired by Sompo for $3.5bn in All-Cash Deal

Aspen Insurance Holdings Limited has announced the publishing of an Information Statement to its shareholders of record as of August 27, 2025, in connection with its acquisition by Sompo Holdings, Inc. for approximately $3.5 billion. The Merger Agreement was entered into on August 27, 2025, and Aspen is providing its other shareholders the opportunity to vote their shares in the manner described in the Information Statement. Shareholders are encouraged to read and carefully review the Information Statement and vote their shares accordingly.

Aspen Insurance Holdings Limited (AHL) has published an Information Statement to its shareholders of record as of August 27, 2025, in connection with its acquisition by Sompo Holdings, Inc. Aspen Announces Publishing of Information Statement to Shareholders of Record as of August 27, 2025^[1]. The acquisition agreement, known as the Merger Agreement, was entered into on the same date. Aspen is providing its other shareholders the opportunity to vote their shares in the manner described in the Information Statement.

The Information Statement outlines the details of the acquisition, including the proposed purchase price of approximately $3.5 billion. Shareholders are encouraged to read and carefully review the Information Statement before casting their votes. A copy of the document has been made available under the "Investors" tab on the company's website.

The acquisition requires no further shareholder approval, as the requisite majority approval was obtained on August 27, 2025. However, Aspen is offering its remaining shareholders the chance to vote their shares in accordance with the instructions provided in the Information Statement.

Aspen Insurance Holdings Limited provides insurance and reinsurance coverage to clients in various domestic and global markets through its wholly-owned operating subsidiaries in Bermuda, the United States, and the United Kingdom, as well as its branch operations in Canada, Singapore, and Switzerland. For more information about Aspen, please visit www.aspen.co.

This communication includes forward-looking statements, which are subject to risks and uncertainties. These statements involve assumptions and estimates that may not materialize or may differ materially from actual results. The forward-looking statements are qualified in their entirety by reference to the risk factors included in Aspen's Annual Report on Form 20-F for the year ended December 31, 2024, and in any subsequent reports on Form 6-K.

For further information, shareholders are advised to contact Mariza Costa, Head of Investor Relations, at Mariza.Costa@Aspen.co or +1 201 539 2668.

Aspen Announces Publishing of Information Statement to Shareholders of Record as of August 27, 2025^[1]: Aspen Insurance Holdings Limited, "Aspen Announces Publishing of Information Statement to Shareholders," Business Wire, September 11, 2025.