As of March 2026 Oneok has a market cap of C$74.63 Billion. This makes Oneok the world's 428th 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 Mar 16th, 2026 the market cap of Oneok was reported to be: