Williams Companies (WMB) - Market capitalization

Market cap: £55.20 Billion

As of December 2025 Williams Companies has a market cap of £55.20 Billion. This makes Williams Companies the world's 299th 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 2025

End of year Market Cap

Year	Marketcap	Change
2025	£55.20 B	5.36%
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 Dec 9th, 2025 the market cap of Williams Companies was reported to be:

£56.15 Billion

by Nasdaq

£56.16 Billion

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
Enterprise Products EPD	£52.11 B	-5.60%	🇺🇸 USA
Enbridge ENB	£76.97 B	39.43%	🇨🇦 Canada
TC Energy TRP	£41.85 B	-24.18%	🇨🇦 Canada
EQT Corporation EQT	£26.69 B	-51.64%	🇺🇸 USA
Southwestern Energy SWN	£5.85 B	-89.39%	🇺🇸 USA
Sea Limited SE	£54.94 B	-0.46%	🇸🇬 Singapore
Ultrapar Participacoes UGP	£3.11 B	-94.36%	🇧🇷 Brazil

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: £55.20 Billion