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White Mountains Insurance Group, Ltd. (WTM) is a financial services company in the multi-line coverage providers industry, based in Hamilton, Bermuda, with about 1,648 full-time employees.
It reported revenue of $2.35 billion for fiscal year 2024, up 8.7% from fiscal year 2023, and net income of $227.40 million. Its largest business segment, Ark/WM Outrigger - Ark, brought in 50% of segment revenue in fiscal year 2025; United Kingdom was the largest region with 46%. Its market capitalization was $4.92 billion as of October 9, 2026.
Figures from company filings and market data; latest fiscal year ended December 31, 2024; market data as of October 9, 2026.
White Mountains Insurance Group, Ltd. provides insurance services in the United States, the United Kingdom, Bermuda, and internationally. It operates through Ark/WM Outrigger, HG Global, Kudu, Distinguished, and Other Operations segments.
White Mountains Insurance Group reported $2.35 billion in revenue for fiscal year 2024, up 8.7% from $2.17 billion in fiscal year 2023.
Ark/WM Outrigger - Ark, with $1.85 billion or 50% of segment revenue in fiscal year 2025. Next: Other (33%) and Bamboo (7%).
United Kingdom: 46% of revenue by region in fiscal year 2025, followed by Bermuda (31%).
$4.92 billion as of October 9, 2026.
Listed companies of a similar size in the same industry (multi-line coverage providers) include Berkshire Hathaway Inc. (BRK-B), Axis Capital Holdings Limited (AXS), Mount Logan Capital Inc. (MLCI).