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Abraxas Petroleum Corp. engages in the acquisition, exploration, development, and production of crude oil and natural gas. It focuses primarily on the development of conventional and unconventional resources in its primary operating areas in the Rocky Mountains, South Texas, Powder River Basin, and Permian Basin. The company was founded by Robert L.G. Watson in 1977 and is headquartered in San Antonio, TX.

Chaparral Energy, Inc. engages in the acquisition, exploration, development, production, and operation of onshore oil and natural gas properties primarily in Oklahoma, the United States. The company sells crude oil, natural gas, and natural gas liquids primarily to refineries and gas processing plant. The company was founded in 1988 and is headquartered in Oklahoma City, Oklahoma.

GulfSlope Energy, Inc. operates as an independent oil and natural gas exploration company primarily in the Gulf of Mexico federal waters offshore Louisiana, the United States. It has leased one federal outer continental shelf block and has licensed 2.2 million acres of three-dimensional seismic data in its area of concentration. The company was formerly known as Plan A Promotions, Inc. and changed its name to GulfSlope Energy, Inc. in April 2012. GulfSlope Energy, Inc. was incorporated in 2003 and is headquartered in Houston, Texas.

Obsidian Energy Ltd. explores for, develops, and produces oil and natural gas in western Canada. It holds interests in the Alberta Viking, Cardium, Deep Basin, and Peace River areas. The company was formerly known as Penn West Petroleum Ltd. and changed its name to Obsidian Energy Ltd. in June 2017. Obsidian Energy Ltd. was founded in 1979 and is headquartered in Calgary, Canada.

Unit Corporation, together with its subsidiaries, engages in the exploration, acquisition, development, and production of oil and natural gas properties in the United States. It operates through three segments: Oil and Natural Gas, Contract Drilling, and Mid-Stream. 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 Arkansas, Colorado, Kansas, Louisiana, Montana, New Mexico, North Dakota, Utah, and Wyoming. The Contract Drilling segment is involved in the contract drilling of onshore oil and natural gas wells for a range of other oil and natural gas companies primarily in Oklahoma, Texas, Wyoming, North Dakota, Colorado, and Utah. It has 55 drilling rigs in its fleet. The Mid-Stream segment buys, sells, gathers, processes, and treats natural gas for third parties. This segment operates 3 natural gas treatment plants, 14 processing plants, 22 gathering systems, and approximately 1,475 miles of pipeline in Oklahoma, Texas, Kansas, Pennsylvania, and West Virginia. Unit Corporation was founded in 1963 and is headquartered in Tulsa, Oklahoma.