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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.

Galp Energia, SGPS, S.A. operates as an integrated energy operator in Portugal and internationally. The company operates through four segments: Upstream, Industrial & Midstream, Commercial, and Renewables and New Business. The Upstream segment engages in the exploration, development, and production of hydrocarbons primarily in Brazil, Mozambique, Namibia, and Angola. The Industrial & Midstream segment owns refineries in Portugal, as well as is involved in activities related to energy management of oil products, gas, and electricity. This segment provides storage and transportation infrastructure for oil and gas products, as well as engages in the sale of electricity to the grid in Portugal and Spain. The Commercial segment is involved in the areas of retail to final business-to-business and business to consumer customers of oil, gas, and electricity. The Renewables and New Business segment is involved in the development of solar and wind power generation projects in Portugal and Spain. In addition, it produces lithium-ion batteries, hydrogen, and biofuels; and operates service stations. Further, the company engages in the reinsurance business. The company was formerly known as Galp Petróleos e Gás de Portugal, SGPS, S.A. and changed its name to Galp Energia, SGPS, S.A. in September 2000. Galp Energia, SGPS, S.A. was incorporated in 1999 and is headquartered in Lisbon, Portugal.

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.

Pioneer Natural Resources Company operates as an independent oil and gas exploration and production company in the United States. The company explores for, develops, and produces oil, natural gas liquids (NGLs), and gas. It has operations in the Midland Basin in West Texas. The company was founded in 1997 and is headquartered in Irving, Texas.

Woodside Energy Group Ltd engages in the exploration, evaluation, development, production, marketing, and sale of hydrocarbons in Oceania, Asia, Canada, Africa, and internationally. The company produces liquefied natural gas, pipeline natural gas, condensate, liquefied petroleum gas, and crude oil. It holds interests in the Greater Browse, Greater Sunrise, Greater Pluto, Greater Exmouth, North West Shelf, Wheatstone, Julimar-Brunello, Canada, Senegal, Greater Scarborough, and Myanmar projects. The company was formerly known as Woodside Petroleum Ltd and changed its name to Woodside Energy Group Ltd in May 2022. Woodside Energy Group Ltd was founded in 1954 and is headquartered in Perth, Australia.