White Mountains Insurance Group (WTM)

What White Mountains Insurance Group does

White Mountains Insurance Group is a Bermuda-based holding company engaged in making opportunistic and value-oriented acquisitions of businesses in the insurance, financial services and related sectors. The company operates primarily through five segments: property and casualty insurance and reinsurance (Ark/WM Outrigger), municipal bond guarantee reinsurance (HG Global), capital solutions for asset and wealth management firms (Kudu), specialty insurance distribution (Distinguished), and other operations including portfolio investments and specialty businesses. As of December 31, 2025, the company conducted these businesses through various subsidiaries, with a diverse portfolio spanning niche insurance products, reinsurance capacity vehicles, asset management platforms, and specialty insurance distribution.

Fundamentals

• Price$2,165.63 as of 2026-07-09 close
• Market cap$5.4B as of 2026-07-09
• 1-year return+20.5% as of 2026-07-09 close
• P/E5.18 as of 2026-07-09
• Net margin+36.8% as of 2026-07-09
• ROE+20.6% as of 2026-07-09
• Debt / equity0.16 as of 2026-07-09
• Revenue growth (YoY)+23.6% as of 2026-07-09
• Revenue CAGR (3y)+47.8% SEC XBRL
• Beta0.31 as of 2026-07-09

Dividend: yield +0.0%; 5-year non-decreasing per-share dividend streak (SEC XBRL).

Ask why WTM looks like this →

Key risks (from latest filing)

["Catastrophic loss exposure from property and casualty underwriting and reinsurance operations, particularly from Ark's property catastrophe portfolio and WM Outrigger Re's collateralized reinsurance agreements"]

See WTM's biggest risks from its latest 10-Q →

Competitors & peers

• Berkshire Hathaway (BRK.B)

Not quite? Describe exactly what you want →