HERITAGE APPROACH TEAM COMPANIES ESG CONTACT FOR SHAREHOLDERS Unlimited Partners For over 30 years, our unique approach and permanent capital base have enabled White Mountains to provide long-term support to our businesses in the insurance and related financial services industries. Our approach to value creation is simple: be opportunistic, invest with patience, and build enduring partnerships with owners and management teams.

Skip to main navigation MAIN NAVIGATION HERITAGE APPROACH TEAM COMPANIES ESG CONTACT FOR SHAREHOLDERS For Shareholders IR pages nav Overview Corporate Governance SEC Filings Earnings Announcements News Stock Information Investor Contacts Insider Transactions White Mountains Insurance Group, Ltd. is an exempted Bermuda limited liability company whose principal businesses are conducted through its insurance subsidiaries and other affiliates. White Mountains' common shares are listed on the New York Stock Exchange and the Bermuda Stock Exchange under the symbol "WTM." As of September 30, 2021 White Mountains has total assets of approximately $7.1 billion, adjusted shareholders equity of $3.5 billion, and adjusted book value per share of $1,176. For a reconciliation of Adjusted Book Value per Share to GAAP Book Value per Share, click here. * Adjusted as if the MediaAlpha transaction had closed on December 31, 2018 Recent News 10-12-2021 Suzanne Shank Elected to the White Mountains Board 06-10-2021 USAA Announces Plans to Acquire Insurtech Company Noblr, Inc. 05-13-2021 White Mountains to Hold 2021 Annual Investor Information Meeting on June 4, 2021 Latest Earnings Release 11-08-2021 White Mountains Reports Third Quarter Results Investor Presentation Investor Presentation - June 2021 Recent Financial Reports Form 10-Q – September 30, 2021 2021 Proxy Statement 2021 CEO Letter to Shareholders 2020 Form 10-K Management Reports 2020 Management Report 2019 Management Report 2018 Management Report Prior Year Financial Reports 2020 Proxy Statement 2019 Form 10-K 2019 Proxy Statement 2018 Form 10-K White Mountains Insurance Group, Ltd. 26 Reid Street, Suite 601 Hamilton HM 11, Bermuda 441-278-3160 23 South Main Street, Suite 3B Hanover, New Hampshire 03755 603-640-2200 265 Franklin Street, Suite 901 Boston, Massachusetts 02110 617-725-7122 200 Hubbard Road Guilford, Connecticut 06437 203-458-5823 info@whitemountains.com FOOTER - LINKS Community Engagement Privacy Policy Safe Harbor Statement © 2021 White Mountains Insurance Group, Ltd.

HERITAGE APPROACH TEAM COMPANIES ESG CONTACT FOR SHAREHOLDERS Community Engagement White Mountains maintains a strong commitment to the communities in which we operate. We are proud to follow the lead of our employees in supporting these and other organizations: White Mountains Insurance Group, Ltd. 26 Reid Street, Suite 601 Hamilton HM 11, Bermuda 441-278-3160 23 South Main Street, Suite 3B Hanover, New Hampshire 03755 603-640-2200 265 Franklin Street, Suite 901 Boston, Massachusetts 02110 617-725-7122 200 Hubbard Road Guilford, Connecticut 06437 203-458-5823 info@whitemountains.com Community Engagement Privacy Policy Safe Harbor Statement ©2021 White Mountains Insurance Group, Ltd.