Atmos Energy (ATO) - Market capitalization

Market cap: £20.21 Billion

As of December 2025 Atmos Energy has a market cap of £20.21 Billion. This makes Atmos Energy the world's 855th 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 Atmos Energy from 1996 to 2025

End of year Market Cap

Year	Marketcap	Change
2025	£20.21 B	17.13%
2024	£17.25 B	27.76%
2023	£13.50 B	3.42%
2022	£13.06 B	26.82%
2021	£10.30 B	16.73%
2020	£8.82 B	-15.39%
2019	£10.42 B	22.15%
2018	£8.53 B	21.09%
2017	£7.05 B	11.65%
2016	£6.31 B	45.44%
2015	£4.34 B	20.26%
2014	£3.61 B	44.17%
2013	£2.50 B	27.34%
2012	£1.96 B	1.6%
2011	£1.93 B	5.67%
2010	£1.83 B	8.45%
2009	£1.68 B	14.62%
2008	£1.47 B	16.13%
2007	£1.26 B	-11.99%
2006	£1.44 B	17.55%
2005	£1.22 B	8.63%
2004	£1.12 B	60.47%
2003	£0.70 B	6.64%
2002	£0.65 B	10.23%
2001	£0.59 B	-5.74%
2000	£0.63 B	59.22%
1999	£0.39 B	-32.92%
1998	£0.59 B	8.16%
1997	£0.54 B	144.6%
1996	£0.22 B

End of Day market cap according to different sources

On Dec 9th, 2025 the market cap of Atmos Energy was reported to be:

£20.21 Billion

by Nasdaq

£20.21 Billion

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
National Fuel Gas NFG	£5.56 B	-72.47%	🇺🇸 USA
ONE Gas OGS	£3.50 B	-82.67%	🇺🇸 USA
NiSource NI	£14.74 B	-27.06%	🇺🇸 USA
Chesapeake Utilities CPK	£2.23 B	-88.94%	🇺🇸 USA
RGC Resources RGCO	£0.17 B	-99.15%	🇺🇸 USA
Oneok OKE	£35.49 B	75.58%	🇺🇸 USA
CenterPoint Energy CNP	£18.61 B	-7.90%	🇺🇸 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 Atmos Energy (ATO)

Market cap: £20.21 Billion