White Mountains Insurance Group Ltd

White Mountains Insurance Group, Ltd. is a Bermuda-domiciled financial services holding company traded on the NYSE (WTM). Its diversified portfolio includes Ark, a global specialty property and casualty insurer and reinsurer operating through Lloyd's of London; WM Outrigger Re, a reinsurance vehicle; Kudu, an asset management business that acquires minority revenue and earnings participation interests in asset and wealth management firms; HG Global, a financial guaranty reinsurance company that provides reinsurance to Build America Mutual (BAM), a mutual bond insurer; Distinguished, a specialty insurance distribution platform offering managing general agency services across programs including environmental, urban real estate, and umbrella lines; MediaAlpha, a publicly traded insurance-focused digital advertising technology company in which White Mountains holds a significant equity stake; and WTM Partners, a services, industrial, and consumer operating segment focused on essential services businesses including Enterprise Solutions and recent acquisitions Basesix and Hawkeye Electric. The company manages its operations across insurance, asset management, insurance distribution, and services verticals, with a focus on deploying capital into high-return opportunities and returning capital to shareholders through share repurchases. Updated Aug 6, 2026