Unit Corporation operates as a contract drilling company. The company operates in three segments: Contract Drilling, Oil and Natural Gas, and Mid-Stream. The Contract Drilling segment engages in the land contract drilling of natural gas and oil wells. Unit Corporation has operations in the provinces of Oklahoma, Texas, Louisiana, Wyoming, Colorado, Utah, and North Dakota. The Oil and Natural Gas segment involves in the exploration, development, acquisition, and production of oil and natural gas properties. Unit Corporation producing oil and natural gas properties, undeveloped leaseholds, and related assets are located primarily in Oklahoma, Texas, Louisiana, and New Mexico, as well as in Arkansas, North Dakota, Colorado, Wyoming, Montana, Alabama, Kansas, Mississippi, Michigan, Pennsylvania, Maryland, and a small portion in Canada. The Mid-Stream segment engages in buying, selling, gathering, processing, and treating natural gas. Unit Corporation operates 3 natural gas treatment plants, 8 operating processing plants, 33 active gathering systems, and 839 miles of pipeline in Oklahoma, Texas, Kansas, and Pennsylvania. Unit Corporation also operates a total fleet of 130 drilling rigs. The company was founded in 1963 and is based in Tulsa, Oklahoma.