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Nostrum Oil & Gas PLC, an independent oil and gas company, engages in the exploration, development, and production of oil and gas in the pre-Caspian Basin. The company discovers and develops oil and gas reserves, as well as produces and sells crude oil, stabilized condensate, liquefied petroleum gas, and dry gas. Its principal producing asset is 100% owned Chinarevskoye field located in North-western Kazakhstan. As of December 31, 2021, the company had proved and probable reserves of 34 million barrels of oil equivalent (mmboe) and 28 mmboe of contingent resources. Nostrum Oil & Gas PLC was founded in 1997 and is based in London, the United Kingdom.

Pantheon Resources Plc, through its subsidiaries, engages in the exploration and production of oil and gas in the United States. Its primary assets are the Alkaid project that covers that covers 40,000 acres located in Alaska; and the Kodiak project covering an area of approximately 124,000 acres located in Alaska. Pantheon Resources Plc was incorporated in 2005 and is based in London, the United Kingdom.

SandRidge Energy, Inc. engages in the acquisition, development, and production of oil, natural gas, and natural gas liquids in the United States Mid-Continent. The company was incorporated in 2006 and is headquartered in Oklahoma City, Oklahoma.

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.

Ultra Petroleum Corp., an independent oil and gas company, engages in the acquisition, exploration, development, operation, and production of oil and natural gas properties. Its principal business activities are developing its natural gas reserves in the Green River Basin of southwest Wyoming—the Pinedale and Jonah fields. As of December 31, 2018, the company owned interests in approximately 114,000 gross acres in Wyoming. The company was founded in 1979 and is headquartered in Englewood, Colorado.