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As of January 15, 2021, Concho Resources Inc. was acquired by ConocoPhillips. Concho Resources Inc., an independent oil and natural gas company, engages in the acquisition, development, and exploration of oil and natural gas properties in the United States. The company's principal operating areas are located in the Permian Basin of West Texas and southeast New Mexico. As of December 31, 2019, its estimated proved reserves totaled 1.0 billion barrels of oil equivalent. The company was founded in 2006 and is headquartered in Midland, Texas.

Denbury Inc. operates as an independent energy company in the Gulf Coast and Rocky Mountain regions. It holds interests in various oil and natural gas properties located in Mississippi, Texas, and Louisiana in the Gulf Coast region; and in Montana, North Dakota, and Wyoming in the Rocky Mountain region. The company was formerly known as Denbury Resources Inc. and changed its name to Denbury Inc. in September 2020. Denbury Inc. was founded in 1951 and is headquartered in Plano, Texas.

Oasis Petroleum, Inc. is an independent exploration and production company with quality and sustainable long-lived assets in the Williston and Delaware Basins. The Company is uniquely positioned with a best-in-class balance sheet and is focused on rigorous capital discipline and generating free cash flow by operating efficiently, safely and responsibly to develop its unconventional onshore oil-rich resources in the continental United States.

Occidental Petroleum Corporation, together with its subsidiaries, engages in the acquisition, exploration, and development of oil and gas properties in the United States, the Middle East, and North Africa. It operates through three segments: Oil and Gas, Chemical, and Midstream and Marketing. The company's Oil and Gas segment explores for, develops, and produces oil and condensate, natural gas liquids (NGLs), and natural gas. Its Chemical segment manufactures and markets basic chemicals, including chlorine, caustic soda, chlorinated organics, potassium chemicals, ethylene dichloride, chlorinated isocyanurates, sodium silicates, and calcium chloride; and vinyls comprising vinyl chloride monomer, polyvinyl chloride, and ethylene. The Midstream and Marketing segment gathers, processes, transports, stores, purchases, and markets oil, condensate, NGLs, natural gas, carbon dioxide, and power. This segment also invests in entities. Occidental Petroleum Corporation was founded in 1920 and is headquartered in Houston, Texas.