White Mountains Insurance Group (WTM)

Market cap: £4.08 Billion

As of February 2026 White Mountains Insurance Group has a market cap of £4.08 Billion. This makes White Mountains Insurance Group the world's 2986th most valuable company by market cap according to our data. The market capitalization, commonly called market cap, is the total market value of a publicly traded company's outstanding shares and is commonly used to measure how much a company is worth.

Market cap history of White Mountains Insurance Group from 1996 to 2026

End of year Market Cap

Year	Marketcap	Change
2026	£4.08 B	4.89%
2025	£3.89 B	-0.79%
2024	£3.92 B	29.82%
2023	£3.02 B	0.43%
2022	£3.01 B	32.87%
2021	£2.26 B	-0.46%
2020	£2.27 B	-15.96%
2019	£2.70 B	26.39%
2018	£2.14 B	-9.23%
2017	£2.36 B	-23.64%
2016	£3.09 B	12.15%
2015	£2.75 B	13.85%
2014	£2.42 B	7.28%
2013	£2.25 B	12.66%
2012	£2.00 B	-9.96%
2011	£2.22 B	24.96%
2010	£1.78 B	-2.19%
2009	£1.82 B	-4.29%
2008	£1.90 B	-30.31%
2007	£2.73 B	-14.39%
2006	£3.18 B	-8.64%
2005	£3.49 B	-3.69%
2004	£3.62 B	56.52%
2003	£2.31 B	37.66%
2002	£1.68 B	-15.39%
2001	£1.98 B	58.21%
2000	£1.25 B	183.43%
1999	£0.44 B	-9.69%
1998	£0.49 B	11.45%
1997	£0.44 B	14.1%
1996	£0.38 B

End of Day market cap according to different sources

On Feb 8th, 2026 the market cap of White Mountains Insurance Group was reported to be:

£4.10 Billion

by Nasdaq

£4.08 Billion

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
Loews Corporation L	£16.96 B	315.26%	🇺🇸 USA
W. R. Berkley WRB	£19.67 B	381.41%	🇺🇸 USA
American International Group AIG	£31.24 B	664.71%	🇺🇸 USA
Chubb CB	£95.75 B	2,243.50%	🇨🇭 Switzerland
The Travelers Companies TRV	£49.43 B	1,109.98%	🇺🇸 USA
Markel Group MKL	£19.55 B	378.52%	🇺🇸 USA
RLI Corp. RLI	£4.16 B	2.03%	🇺🇸 USA
Warrior Met Coal HCC	£3.44 B	-15.77%	🇺🇸 USA
Alleghany Y	£8.38 B	105.24%	🇺🇸 USA

What is the market capitalization of a company?

The market capitalization sometimes referred as Marketcap, is the value of a publicly listed company.
In most cases it can be easily calculated by multiplying the share price with the amount of outstanding shares.

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Market capitalization of White Mountains Insurance Group (WTM)

Market cap: £4.08 Billion