ONEOK, Inc. is a midstream operator that provides gathering, processing, fractionation, transportation, storage and marine export services. The Company's segments include Natural Gas Gathering and Processing; Natural Gas Liquids; Natural Gas Pipelines, and Refined Products and Crude. The Natural Gas Gathering and Processing segment provides midstream services to producers in the Rocky Mountain region, the Mid-Continent region, the Permian Basin region and the North Texas region. The Natural Gas Liquids segment owns and operates facilities that gather, fractionate, treat and distribute natural gas liquids (NGLs) and store Purity NGLs, primarily in the Rocky Mountain region, Mid-Continent region, Permian Basin and Gulf Coast region (including Louisiana). The Natural Gas Pipelines segment transports, stores and markets natural gas. The Refined Products and Crude segment gathers, transports, stores, distributes, blends and markets refined products and crude oil.