Atmos Energy (ATO) - Market capitalization

Market cap: $27.54 Billion USD

As of January 2026 Atmos Energy has a market cap of $27.54 Billion USD. This makes Atmos Energy the world's 883th 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 2026

End of year Market Cap

Year	Marketcap	Change
2026	$27.54 B	1.28%
2025	$27.19 B	25.55%
2024	$21.65 B	25.85%
2023	$17.21 B	8.9%
2022	$15.80 B	13.67%
2021	$13.90 B	15.6%
2020	$12.02 B	-12.05%
2019	$13.67 B	26.18%
2018	$10.83 B	13.73%
2017	$9.53 B	22.3%
2016	$7.79 B	21.1%
2015	$6.43 B	14.47%
2014	$5.62 B	36.07%
2013	$4.13 B	29.96%
2012	$3.17 B	5.66%
2011	$3.00 B	6.4%
2010	$2.82 B	3.46%
2009	$2.73 B	26.55%
2008	$2.15 B	-14.32%
2007	$2.52 B	-10.74%
2006	$2.82 B	33.52%
2005	$2.11 B	-2.43%
2004	$2.16 B	72.22%
2003	$1.25 B	18.97%
2002	$1.05 B	21.91%
2001	$0.86 B	-8.43%
2000	$0.94 B	47.07%
1999	$0.64 B	-34.81%
1998	$0.98 B	9.48%
1997	$0.90 B	134.65%
1996	$0.38 B

End of Day market cap according to different sources

On Jan 15th, 2026 the market cap of Atmos Energy was reported to be:

$27.53 Billion USD

by Nasdaq

$27.54 Billion USD

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
National Fuel Gas NFG	$7.72 B	-71.96%	🇺🇸 USA
ONE Gas OGS	$4.67 B	-83.02%	🇺🇸 USA
NiSource NI	$20.59 B	-25.21%	🇺🇸 USA
Chesapeake Utilities CPK	$2.97 B	-89.19%	🇺🇸 USA
RGC Resources RGCO	$0.22 B	-99.17%	🇺🇸 USA
Oneok OKE	$46.19 B	67.71%	🇺🇸 USA
CenterPoint Energy CNP	$25.66 B	-6.82%	🇺🇸 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: $27.54 Billion USD