Williams Companies (WMB) - Market capitalization

Market cap: £66.28 Billion

As of March 2026 Williams Companies has a market cap of £66.28 Billion. This makes Williams Companies the world's 246th 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 Williams Companies from 1996 to 2026

End of year Market Cap

Year	Marketcap	Change
2026	£66.28 B	22.81%
2025	£53.97 B	3.01%
2024	£52.39 B	57.55%
2023	£33.25 B	0.38%
2022	£33.13 B	41.35%
2021	£23.43 B	31.3%
2020	£17.85 B	-18.58%
2019	£21.92 B	4.3%
2018	£21.01 B	12.69%
2017	£18.65 B	-1.57%
2016	£18.94 B	45.88%
2015	£12.98 B	-39.76%
2014	£21.56 B	35.01%
2013	£15.97 B	15.77%
2012	£13.79 B	10.16%
2011	£12.52 B	33.67%
2010	£9.36 B	23.35%
2009	£7.59 B	32.84%
2008	£5.71 B	-45.83%
2007	£10.55 B	32.55%
2006	£7.96 B	3.35%
2005	£7.70 B	62.72%
2004	£4.73 B	66.44%
2003	£2.84 B	226.95%
2002	£0.87 B	-90.41%
2001	£9.07 B	-24.3%
2000	£11.98 B	43.78%
1999	£8.33 B	3.77%
1998	£8.03 B	44.62%
1997	£5.55 B	61.07%
1996	£3.44 B

End of Day market cap according to different sources

On Mar 20th, 2026 the market cap of Williams Companies was reported to be:

£66.37 Billion

by Nasdaq

£66.28 Billion

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
TC Energy TRP	£49.40 B	-25.46%	🇨🇦 Canada
Enbridge ENB	£87.43 B	31.91%	🇨🇦 Canada
Ultrapar Participacoes UGP	£3.93 B	-94.07%	🇧🇷 Brazil
Southwestern Energy SWN	£5.87 B	-91.13%	🇺🇸 USA
Sea Limited SE	£34.98 B	-47.23%	🇸🇬 Singapore
EQT Corporation EQT	£30.25 B	-54.36%	🇺🇸 USA
Enterprise Products EPD	£60.84 B	-8.21%	🇺🇸 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 Williams Companies (WMB)

Market cap: £66.28 Billion