ONEOK, Inc. engages in gathering, processing, fractionating, transporting, storing, and marketing of natural gas. It operates through the following business segments: Natural Gas Gathering and Processing, Natural Gas Liquids, and Natural Gas Pipelines. The Natural Gas Gathering and Processing segment offers midstream services to contracted producers. The Natural Gas Liquids segment includes owning and operating facilities that gather, fractionate, treat, and distribute products. The Natural Gas Pipelines segment operates regulated interstate and intrastate natural gas transmission pipelines and natural gas storage facilities. The company was founded in 1906 and is headquartered in Tulsa, OK.