ONEOK, Inc., together with its subsidiaries, engages in gathering, processing, storage, and transportation of natural gas in the United States. It operates through Natural Gas Gathering and Processing, Natural Gas Liquids, and Natural Gas Pipelines segments. The company owns natural gas gathering pipelines and processing plants in the Mid-Continent and Rocky Mountain regions. The company owns NGL gathering and distribution pipelines in Oklahoma, Kansas, Texas, New Mexico, Montana, North Dakota, Wyoming, and Colorado; terminal and storage facilities in Missouri, Nebraska, Iowa, and Illinois; and NGL distribution and refined petroleum products pipelines in Kansas, Missouri, Nebraska, Iowa, Illinois, and Indiana, as well as owns and operates truck- and rail-loading, and -unloading facilities that interconnect with its NGL fractionation and pipeline assets. The company was founded in 1906 and is headquartered in Tulsa, Oklahoma.