White Mountains Insurance Group Email Format
InsuranceHamilton Parish, Bermuda11-50 Employees
White Mountains Insurance Group is a diversified holding company operating in the insurance and related financial services sectors, owning and managing a portfolio of businesses. It positions itself as a dependable partner for its portfolio companies and shareholders, aiming to create value through prudent, opportunistic management. The company is domiciled in Hamilton Parish, Bermuda, with executive headquarters in Hanover, New Hampshire, and maintains offices in Boston and Guilford, Connecticut. It trades on the New York Stock Exchange under the ticker WTM. Manning Rountree retired as chief executive officer at the end of 2025, and Liam Caffrey is slated to assume the role on January 1, 2026.