Share this article Share this article TULSA, Okla., Feb. 22, 2021 /PRNewswire/ -- ONEOK, Inc. (NYSE: OKE) today announced fourth quarter and full-year 2020 results and announced 2021 financial guidance. Fourth Quarter 2020 Results, Compared With Fourth Quarter 2019: 11% increase in operating income to $538.7 million. 12% increase in adjusted EBITDA to $742.0 million. 24% increase in Rocky Mountain region NGL raw feed throughput volumes. 11% increase in Rocky Mountain region natural gas volumes processed. $1.04 per MMBtu average fee rate in the natural gas gathering and processing segment....