ONEOK, Inc. is a midstream operator that provides gathering, processing, fractionation, transportation, storage and marine export services. Its 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, and the Permian Basin region. The Natural Gas Liquids segment gathers, treats, fractionates and transports natural gas liquids (NGLs) and stores, markets and distributes Purity NGLs. It provides midstream services to producers of NGLs in the Rocky Mountain region, Mid-Continent region, Permian Basin and Gulf Coast region and delivers those products to the market. 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.