In connection with his retirement as Chairman and Chief Executive Officer, and director of White Mountains Insurance Group, Ltd. (White Mountains), effective as of March 1, 2017, Raymond Barrette resigned his role as a Class III director of OneBeacon Insurance Group, Ltd. (OneBeacon), effective as of such date.

Effective March 6, 2017, Manning Rountree was appointed as a Class III director to fill the vacancy created by Mr. Barrette’s resignation. Mr. Rountree’s appointment was effected by a vote of the Company’s Class B common shares, all of which are held indirectly by White Mountains. As an employee of White Mountains, Mr. Rountree is not entitled to any compensation for his service as a director of OneBeacon.

Mr. Rountree was appointed as director and Chief Executive Officer of White Mountains on March 1, 2017. Prior to that, he was Executive Vice President of White Mountains and President of White Mountains Capital, Inc. He joined White Mountains in 2004 and served as the President of White Mountains Advisors from February 2009 until December 2014. Prior to joining White Mountains, Mr. Rountree was a Senior Vice President at Putnam Investments for two years. Prior to joining Putnam Investments, Mr. Rountree spent three years with McKinsey & Company. Mr. Rountree also serves as a director of Build America Mutual Insurance Company and, since June 2015, the Board of Directors of Admiral Group plc where he also serves on the Group Risk Committee.

About ONEBEACON INSURANCE GROUP, LTD. (NYSE:OB)

OneBeacon Insurance Group, Ltd., through its subsidiaries, is a property and casualty insurance writer that offers a range of insurance products in the United States primarily through independent agencies, regional and national brokers, wholesalers and managing general agencies. The Company’s segments include Specialty Products, Specialty Industries, and Investing, Financing and Corporate. The Specialty Products segment consists of over 10 underwriting operating segments representing an aggregation based on those that offer products, coverages and services to customers across the United States. The Specialty Industries segment consists of over six underwriting operating segments representing an aggregation based on those that focus on a particular customer or industry group. The Investing, Financing and Corporate segment includes its investing and financing activities on a consolidated basis, and certain other activities conducted through it and its intermediate subsidiaries.

ONEBEACON INSURANCE GROUP, LTD. (NYSE:OB) Recent Trading Information

ONEBEACON INSURANCE GROUP, LTD. (NYSE:OB) closed its last trading session down -0.27 at 16.18 with 86,889 shares trading hands.