Unit Corporation, together with its subsidiaries, engages in the exploration, acquisition, development, and production of oil and natural gas properties in the United States. The company operates through Oil and Natural Gas, Contract Drilling, and Mid-Stream segments. The Oil and Natural Gas segment explores for, acquires, develops, and produces oil and natural gas properties. Its producing oil and natural gas properties, unproved properties, and related assets are primarily located in Oklahoma and Texas, as well as in Kansas, and Louisiana. The Contract Drilling segment is involved in the drilling of onshore oil and natural gas wells for a range of other oil and natural gas companies primarily in Oklahoma, Texas, and New Mexico. The Mid-Stream segment buys, sells, gathers, processes, and treats natural gas for third parties. This segment operates natural gas treatment plants, processing plants, gathering systems, and pipeline in Oklahoma, Texas, Kansas, Pennsylvania, and West Virginia. Unit Corporation was incorporated in 1963 and is headquartered in Tulsa, Oklahoma.