White Mountains Insurance Group, Ltd.
White Mountains Insurance Group, Ltd. (NYSE: WTM) makes opportunistic acquisitions of businesses and assets in insurance, financial services and related sectors, operating them through subsidiaries and affiliates and pursuing exits when valuations are attractive. Its reportable segments are Ark/WM Outrigger, which… From the company’s description.
In fiscal 2025, White Mountains Insurance Group, Ltd. reported revenue of $3.73B, up 66.8% from fiscal 2024, and net income of $1.20B. Its operating margin was 6.3%, and operations generated $550.50M in cash. Over the twelve months to Jun 30, 2026, revenue was $3.83B.
Margins and return on equity change in ; everything else in percent. Fewer shares and less debt are shown plainly, not as bad news — it depends what you make of buybacks. Dotted labels explain each measure. is shown separately from the annual figures.
What White Mountains Insurance Group, Ltd. does
In the company’s own words
White Mountains Insurance Group, Ltd. (NYSE: WTM) makes opportunistic acquisitions of businesses and assets in insurance, financial services and related sectors, operating them through subsidiaries and affiliates and pursuing exits when valuations are attractive. Its reportable segments are Ark/WM Outrigger, which provides specialty property and casualty insurance and reinsurance; HG Global, which reinsures municipal bond guarantees for BAM; Kudu, which provides capital solutions to asset and wealth management firms; and Distinguished, a specialty insurance distributor. Ark writes property, specialty, marine and energy, casualty, and accident and health coverage, primarily through brokers, managing general agents and reinsurance intermediaries. HG Global’s reinsurance supports insurance on U.S. municipal bonds issued to finance public-purpose projects, while Kudu invests in asset and wealth management businesses. Other Operations includes holding companies, investment assets and interests in additional businesses. White Mountains reported $6.1 billion in total assets related to Ark as of December 31, 2025. Its website is www.whitemountains.com.
Company details
- Sector
- Financials
- Industry (SIC)
- Property & Casualty Insurance
- Headquarters
- HANOVER, NH
- Fiscal year end
- December
- CIK
- 776867
- SIC
- 6331
Financial performance, year by year
Fiscal 2013–2025 · USDThe full income statement, balance sheet and cash flow for each of these years — every figure traceable to its filing — is on the Financials tab with a free account.
Who owns White Mountains Insurance Group, Ltd. — and what changed
Funds as of 2026Q2 · superinvestors as of 2026-06-30
Largest fund holders · White Mountains Insurance Group, Ltd.’s weight in each
Fund ownership is a floor, not a census — pensions, insurers and people holding shares directly are not visible here.
Fund ownership counts N-PORT filers only, so it is a floor rather than a census — pensions, insurers and direct holders are not visible here, and the remainder is not “held by individuals”.
Every fund and institutional holder, quarter by quarter, is on the Ownership tab with a free account.
Recent filings
All filings →Each filing opens into its own statements and disclosures here.
Put this business in context.
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