ONE Gas (OGS) - Market capitalization

Market cap: €4.11 Billion

As of September 2026 ONE Gas has a market cap of €4.11 Billion. This makes ONE Gas the world's 3280th 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	€4.11 B	3.71%
2025	€3.96 B	4.74%
2024	€3.78 B	18.48%
2023	€3.19 B	-16.36%
2022	€3.82 B	4.1%
2021	€3.67 B	10.78%
2020	€3.31 B	-24.82%
2019	€4.40 B	20.52%
2018	€3.65 B	14.59%
2017	€3.19 B	0.47%
2016	€3.17 B	32.49%
2015	€2.39 B	35.84%
2014	€1.76 B

End of Day market cap according to different sources

On Sep 18th, 2026 the market cap of ONE Gas was reported to be:

€4.11 Billion

by Nasdaq

€4.11 Billion

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
Atmos Energy ATO	€23.57 B	473.17%	🇺🇸 USA
CenterPoint Energy CNP	€21.91 B	432.70%	🇺🇸 USA
RGC Resources RGCO	€0.19 B	-95.29%	🇺🇸 USA
NW Natural Holdings NWN	€1.77 B	-56.95%	🇺🇸 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: €4.11 Billion