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White Mountains Insurance Group, Ltd. is an exempted Bermuda limited liability company whose principal businesses are conducted through its subsidiaries and affiliates. White Mountains' common shares are listed on the New York Stock Exchange under the symbol "WTM" and the Bermuda Stock Exchange under the symbol "WTM.BH". As of December 31, 2025 White Mountains has total assets of approximately $12.0 billion, common shareholders’ equity of $5.4 billion, and book value per share of $2,188.

2025 Chart

Beginning in 2025, White Mountains no longer reports adjusted book value per share. For a reconciliation of historical GAAP book value per share to adjusted book value per share, click here.

 

Recent News
04-01-2026
White Mountains Partners Announces Acquisition of BaseSix

NEW YORK, New York, April 1, 2026 – White Mountains Partners (“WMP”), a White Mountains operating company, announced today that it has acquired a majority interest in BaseSix Systems LLC (“Basesix” or the “Company”), a provider of building systems integration and aftermarket service.

02-27-2026
White Mountains Declares Annual Dividend
HAMILTON, Bermuda, Feb. 27, 2026 /PRNewswire/ -- At its regular meeting held on February 26, 2026, the Board of Directors of White Mountains Insurance Group, Ltd. declared a $1.00 per share annual dividend, payable in cash on March 25, 2026, to holders of record of Common Shares as of the close of
02-26-2026
Bishop Street Underwriters Announces Strategic Investment by White Mountains

Strategic Investment to Support and Accelerate Growth NEW YORK, NY, February 26, 2026 – Bishop Street Underwriters (“Bishop Street”), a RedBird Capital Partners portfolio company, today announced that it has completed a strategic structured capital investment of $125 million by White Mountains

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