Southwest Gas (SWX) - Market capitalization

Market cap: £4.28 Billion

As of December 2025 Southwest Gas has a market cap of £4.28 Billion. This makes Southwest Gas the world's 2848th 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 Southwest Gas from 1996 to 2025

End of year Market Cap

Year	Marketcap	Change
2025	£4.28 B	6.46%
2024	£4.02 B	13.09%
2023	£3.55 B	3.67%
2022	£3.43 B	9.47%
2021	£3.13 B	23.72%
2020	£2.53 B	-20.52%
2019	£3.18 B	-0.28%
2018	£3.19 B	11.59%
2017	£2.86 B	-2.87%
2016	£2.94 B	67.19%
2015	£1.76 B	-4.52%
2014	£1.84 B	17.55%
2013	£1.57 B	29.76%
2012	£1.21 B	-3.52%
2011	£1.25 B	15.87%
2010	£1.08 B	36.25%
2009	£0.79 B	5.2%
2008	£0.75 B	17.81%
2007	£0.64 B	-21.61%
2006	£0.81 B	35.9%
2005	£0.60 B	23.68%
2004	£0.48 B	13.31%
2003	£0.42 B	-11.76%
2002	£0.48 B	-2.8%
2001	£0.50 B	7.77%
2000	£0.46 B	5.38%
1999	£0.44 B	-10.26%
1998	£0.49 B	57.75%
1997	£0.31 B	3.67%
1996	£0.30 B

End of Day market cap according to different sources

On Dec 6th, 2025 the market cap of Southwest Gas was reported to be:

£4.28 Billion

by Nasdaq

£4.28 Billion

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
NW Natural NWN	£1.43 B	-66.38%	🇺🇸 USA
Atmos Energy ATO	£20.77 B	385.20%	🇺🇸 USA
Sempra Energy SRE	£44.38 B	936.60%	🇺🇸 USA
Oneok OKE	£36.06 B	742.20%	🇺🇸 USA
National Fuel Gas NFG	£5.54 B	29.51%	🇺🇸 USA
CenterPoint Energy CNP	£18.81 B	339.53%	🇺🇸 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 Southwest Gas (SWX)

Market cap: £4.28 Billion