ONEOK, Inc. engages in gathering, processing, and transporting natural gas. It operates through the following 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 involves in providing transportation and storage services to end users through ONEOK Partners. The company was founded in 1906 and is headquartered in Tulsa, OK.