ONEOK, Inc. is an energy company. The Company provides midstream services and owns natural gas liquids (NGLs) systems, connecting NGL supply in the Rocky Mountain, Permian and Mid-Continent regions with key market centers and a network of natural gas gathering, processing, storage, and transportation assets. Its business segments include Natural Gas Gathering and Processing, Natural Gas Liquids and Natural Gas Pipelines. The Natural Gas Gathering and Processing segment provides midstream services to producers in North Dakota, Montana, Wyoming, Kansas and Oklahoma. The Natural Gas Liquids segment owns and operates facilities that gather, fractionate, and distribute NGLs and store NGL products, primarily in Oklahoma, Kansas, Texas, New Mexico and the Rocky Mountain region, which includes the Williston, Powder River and DJ Basins. The Natural Gas Pipelines segment, through its wholly owned assets, provides intrastate and interstate transportation and storage services to end users.