White Mountains Insurance Group (WTM)

Market cap: £3.89 Billion

As of December 2025 White Mountains Insurance Group has a market cap of £3.89 Billion. This makes White Mountains Insurance Group the world's 3001th 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 2025

End of year Market Cap

Year	Marketcap	Change
2025	£3.89 B	-0.76%
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 Dec 6th, 2025 the market cap of White Mountains Insurance Group was reported to be:

£3.89 Billion

by Nasdaq

£3.89 Billion

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
Chubb CB	£88.21 B	2,163.96%	🇨🇭 Switzerland
The Travelers Companies TRV	£47.43 B	1,117.27%	🇺🇸 USA
W. R. Berkley WRB	£19.01 B	388.06%	🇺🇸 USA
Loews Corporation L	£15.99 B	310.54%	🇺🇸 USA
RLI Corp. RLI	£4.30 B	10.43%	🇺🇸 USA
Alleghany Y	£8.55 B	119.58%	🇺🇸 USA
American International Group AIG	£32.00 B	721.46%	🇺🇸 USA
Markel Group MKL	£19.43 B	398.74%	🇺🇸 USA
Warrior Met Coal HCC	£3.21 B	-17.42%	🇺🇸 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: £3.89 Billion