ONE Gas (OGS) - Market capitalization

Market cap: $5.13 Billion USD

As of February 2026 ONE Gas has a market cap of $5.13 Billion USD. This makes ONE Gas the world's 3127th 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 ONE Gas from 2014 to 2026

End of year Market Cap

Year	Marketcap	Change
2026	$5.13 B	10.12%
2025	$4.65 B	18.23%
2024	$3.94 B	11.53%
2023	$3.53 B	-13.81%
2022	$4.09 B	-1.4%
2021	$4.15 B	2%
2020	$4.07 B	-17.45%
2019	$4.93 B	18.01%
2018	$4.18 B	9.26%
2017	$3.82 B	14.6%
2016	$3.34 B	27.45%
2015	$2.62 B	22.12%
2014	$2.14 B

End of Day market cap according to different sources

On Feb 21st, 2026 the market cap of ONE Gas was reported to be:

$5.13 Billion USD

by Nasdaq

$5.13 Billion USD

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
Atmos Energy ATO	$29.93 B	483.49%	🇺🇸 USA
CenterPoint Energy CNP	$28.07 B	447.12%	🇺🇸 USA
RGC Resources RGCO	$0.21 B	-95.73%	🇺🇸 USA
NW Natural NWN	$2.07 B	-59.46%	🇺🇸 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 ONE Gas (OGS)

Market cap: $5.13 Billion USD