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.