White Mountains Insurance Group, Ltd. (WTM)

WTM Revenue

White Mountains Insurance Group had revenue of $641.10M in the quarter ending September 30, 2026, a decrease of -25.82%. This brings the company's total for the last twelve months to $3.61B, up 44.92% year-over-year. In the year 2025, White Mountains Insurance Group had annual revenue of $3.74B with 66.76% growth. That makes White Mountains Insurance Group the 3,850th largest company in the world by revenue and 1,059th in the United States.

• Revenue (ttm): $3.61B
• Revenue Growth: +44.92%
• P/S Ratio: 2.01
• Revenue / Employee: $1,673,544
• Employees: 1,648
• Market Cap: 5.40B

Revenue Chart

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Revenue by Segment

By Segment

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• Ark/WM Outrigger - Ark 1.85B 49.5%
• Other 1.23B 32.9%
• Bamboo 246.30M 6.6%
• Kudu 183.40M 4.9%
• Ark/WM Outrigger - WM Outrigger Re 93.70M 2.5%
• HG Global 74.40M 2.0%
• Distinguished 57.70M 1.5%

By Geography

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• United Kingdom 1.05B 46.2%
• Bermuda 705.10M 31.2%
• United States 493.50M 21.8%
• Other 16.40M 0.7%

Fiscal year ended Dec 31, 2025 See the full WTM breakdown

Revenue History

Fiscal Year End	Revenue	Change	Growth
Dec 31, 2025	3.74B	1.50B	66.76%
Dec 31, 2024	2.24B	73.10M	3.37%
Dec 31, 2023	2.17B	1.01B	87.12%
Dec 31, 2022	1.16B	543.50M	88.46%
Dec 31, 2021	614.40M	-566.30M	-47.96%
Dec 31, 2020	1.18B	287.30M	32.16%
Dec 31, 2019	893.40M	524.30M	142.05%
Dec 31, 2018	369.10M	-4.70M	-1.26%
Dec 31, 2017	373.80M	216.10M	137.03%
Dec 31, 2016	157.70M	-282.30M	-64.16%
Dec 31, 2015	440.00M	-971.10M	-68.82%
Dec 31, 2014	1.41B	49.50M	3.64%
Dec 31, 2013	1.36B	-1.07B	-44.10%
Dec 31, 2012	2.44B	262.60M	12.08%
Dec 31, 2011	2.17B	-160.60M	-6.88%
Dec 31, 2010	2.33B	-1.11B	-32.22%
Dec 31, 2009	3.44B	497.90M	16.90%
Dec 31, 2008	2.95B	-1.79B	-37.78%
Dec 31, 2007	4.73B	-60.40M	-1.26%
Dec 31, 2006	4.79B	162.30M	3.50%
Dec 31, 2005	4.63B	-	-

Data Sources: Fiscal.ai and S&P Global Market Intelligence Last updated: Nov 5, 2026

Revenue data is provided by Fiscal.ai and updates within minutes after each earnings release, which is every three months for this company. Revenue segment and geography data is provided by S&P Global Market Intelligence.

Update frequency:

Quarterly

Last checked:

Nov 5, 2026

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