Corporate Headquarters
14 Wesley Street, 5th Floor
Hamilton HM 11, Bermuda

Principal Executive Office
601 Carlson Parkway
Minnetonka, MN 55305

U.S. Headquarters
One Beacon Lane
Canton, MA 02021

Registered Office
Clarendon House
2 Church Street
Hamilton HM 11, Bermuda

Annual Meeting
The 2010 Annual General Meeting of Members (AGM) will be held on June 16, 2010, at Tucker’s Point Hotel, Hamilton Parish, Bermuda, and will commence at 12:00 noon Atlantic time (11:00 a.m. Eastern time).

Proxy materials for the AGM, including the Notice of 2010 Annual General Meeting of Members and Proxy Statement, Form 10-K and Annual Report, as well as all other SEC filings and reports, and press releases, are available online at www.onebeacon.com for viewing and downloading.

Stock Exchange Information
The company’s common shares are listed on the New York Stock Exchange under the symbol “OB.”

Transfer Agent, Registrar for Common Shares and Dividend Disbursing Agent Mailing Address
Wells Fargo Bank, N.A.
161 North Concord Exchange
South St. Paul, MN 55075
Tel: 800.468.9716
Shareholders may obtain information about transfer requirements, replacement dividend checks, duplicate 1099 forms and changes of address by calling the Transfer Agent’s Telephone Response Center at 800.468.9716 or 651.450.4144 for the hearing impaired, or visiting the Transfer Agent’s Web site at www.wellsfargo.com/shareholderservices.

Please be prepared to provide your tax identification or Social Security number, description of securities and address of record. Other inquiries concerning your shareholder account should be addressed in writing to the Transfer Agent and Registrar.

Shareholder Inquiries
Written shareholder inquiries, including requests for copies of the company’s Annual Report and SEC filings, should be sent to the Corporate Secretary at the company’s Bermuda corporate headquarters. Written inquiries from the investment community should be directed to the Investor Relations Department at the company’s Bermuda corporate headquarters.

Additional Information
We make our Web site content available for informational purposes only. It should not be relied upon for investment purposes, nor is it incorporated by reference into this Annual Report.

Safe Harbor Statement Under the Private Securities Litigation Reform Act of 1995
Statements in our 2009 Annual Report regarding our business which are not historical facts are “forward-looking statements” that involve risks and uncertainties. For a discussion of such risks and uncertainties which could cause actual results to differ from those contained in the forward-looking statements, see “Risk Factors,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” and “Quantitative and Qualitative Disclosures About Market Risk” in our Annual Report on Form 10-K.