ONEOK, Inc. operates as a diversified energy company in the United States. The company operates in three segments: ONEOK Partners, Natural Gas Distribution, and Energy Services. The ONEOK Partners segment engages in gathering, processing, storing, and transporting natural gas; owns and operates interstate and intrastate regulated natural gas transmission pipelines and natural gas storage facilities; and gathers, treats, fractionates, stores, and transports natural gas liquids (NGL) to third-party fractionators and pipelines. This segment is also involved in the storage and distribution of NGL products to petrochemical manufacturers, heating-fuel users, refineries, and propane distributors through regulated distribution pipelines. The Natural Gas Distribution segment provides natural gas distribution services to approximately 2 million customers, including residential, commercial, industrial, and transportation customers, as well as wholesale and public authority customers in Oklahoma, Kansas, and Texas. The Energy Services segment offers natural gas supply and risk-management services for natural gas and electric utilities, and commercial and industrial customers through its network of leased storage and transportation capacity. The company also owns and operates a parking garage. ONEOK, Inc. operates as a general partner of ONEOK Partners. ONEOK, Inc. was founded in 1906 and is headquartered in Tulsa, Oklahoma.