Oneok (OKE) - Market capitalization

Market cap: €41.15 Billion

As of December 2025 Oneok has a market cap of €41.15 Billion. This makes Oneok the world's 487th 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 Oneok from 1996 to 2025

End of year Market Cap

Year	Marketcap	Change
2025	€41.15 B	-27.3%
2024	€56.61 B	52.98%
2023	€37.00 B	35.17%
2022	€27.37 B	18.32%
2021	€23.13 B	66.86%
2020	€13.86 B	-50.32%
2019	€27.91 B	43.83%
2018	€19.40 B	13.62%
2017	€17.08 B	48.66%
2016	€11.49 B	142.91%
2015	€4.73 B	-44.54%
2014	€8.52 B	-8.33%
2013	€9.30 B	40.46%
2012	€6.62 B	-3.66%
2011	€6.87 B	54.34%
2010	€4.45 B	35.2%
2009	€3.29 B	50.86%
2008	€2.18 B	-31.51%
2007	€3.18 B	-11.84%
2006	€3.61 B	64.76%
2005	€2.19 B	0.65%
2004	€2.18 B	30.65%
2003	€1.66 B	21.83%
2002	€1.37 B	13.06%
2001	€1.21 B	-19.81%
2000	€1.51 B	104.83%
1999	€0.73 B	-23.13%
1998	€0.96 B	-9.72%
1997	€1.06 B	54.04%
1996	€0.69 B

End of Day market cap according to different sources

On Dec 4th, 2025 the market cap of Oneok was reported to be:

€41.11 Billion

by Nasdaq

€41.15 Billion

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
Atmos Energy ATO	€23.71 B	-42.38%	🇺🇸 USA
Sempra Energy SRE	€50.43 B	22.55%	🇺🇸 USA
National Fuel Gas NFG	€6.37 B	-84.51%	🇺🇸 USA
Western Midstream WES	€14.10 B	-65.72%	🇺🇸 USA
Sea Limited SE	€68.78 B	67.12%	🇸🇬 Singapore
UGI Corporation UGI	€6.89 B	-83.24%	🇺🇸 USA
Southwest Gas SWX	€4.89 B	-88.11%	🇺🇸 USA
EQT Corporation EQT	€32.16 B	-21.85%	🇺🇸 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 Oneok (OKE)

Market cap: €41.15 Billion