As of September 2026 Oneok has a market cap of โฌ51.27 Billion. This makes Oneok the world's 429th 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.
On Sep 19th, 2026 the market cap of Oneok was reported to be: