Atmos Energy (ATO) - Market capitalization

Market cap: C$37.26 Billion

As of December 2025 Atmos Energy has a market cap of C$37.26 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	C$37.26 B	19.89%
2024	C$31.08 B	36.16%
2023	C$22.82 B	6.45%
2022	C$21.44 B	21.03%
2021	C$17.71 B	15.54%
2020	C$15.33 B	-14.14%
2019	C$17.86 B	20.98%
2018	C$14.76 B	23.22%
2017	C$11.98 B	14.41%
2016	C$10.47 B	17.31%
2015	C$8.92 B	36.83%
2014	C$6.52 B	48.34%
2013	C$4.39 B	39.12%
2012	C$3.16 B	3.29%
2011	C$3.06 B	8.27%
2010	C$2.82 B	-1.71%
2009	C$2.87 B	9.51%
2008	C$2.62 B	4.42%
2007	C$2.51 B	-23.52%
2006	C$3.28 B	33.53%
2005	C$2.46 B	-5.42%
2004	C$2.60 B	59.46%
2003	C$1.63 B	-2.29%
2002	C$1.67 B	20.86%
2001	C$1.38 B	-2.63%
2000	C$1.41 B	52.77%
1999	C$0.92 B	-38.85%
1998	C$1.51 B	17.81%
1997	C$1.29 B	144.78%
1996	C$0.52 B

End of Day market cap according to different sources

On Dec 8th, 2025 the market cap of Atmos Energy was reported to be:

C$37.42 Billion

by Nasdaq

C$37.42 Billion

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
National Fuel Gas NFG	C$10.25 B	-72.49%	🇺🇸 USA
ONE Gas OGS	C$6.46 B	-82.64%	🇺🇸 USA
NiSource NI	C$27.26 B	-26.83%	🇺🇸 USA
Chesapeake Utilities CPK	C$4.10 B	-88.98%	🇺🇸 USA
RGC Resources RGCO	C$0.32 B	-99.14%	🇺🇸 USA
Oneok OKE	C$65.56 B	75.94%	🇺🇸 USA
CenterPoint Energy CNP	C$34.49 B	-7.44%	🇺🇸 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: C$37.26 Billion