For Shareholders

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White Mountains Insurance Group, Ltd. (White Mountains or the Company) is a financial services holding company with primary business interests in property and casualty insurance and reinsurance. The Company's corporate headquarters and its registered office are located in Hamilton, Bermuda and its principal executive office is located in Hanover, New Hampshire.

White Mountains' common shares are listed on the New York Stock Exchange and the Bermuda Stock Exchange under the symbol "WTM". As of December 31, 2017 White Mountains has total assets of approximately $3.7 billion, adjusted shareholders equity of $3.5 billion, and adjusted book value per Share of $915.

Shareholder Contact:

White Mountains Insurance Group, Ltd.
80 South Main Street
Hanover, New Hampshire 03755

Attn: Corporate Secretary
Tel: 603-640-2200
Fax: 603-643-4592
E-mail: info@whitemountains.com