ConocoPhillips Company is an American multinational corporation engaged in hydrocarbon exploration and production. It is based in the Energy Corridor district of Houston, Texas.
Ovintiv Inc. is an American petroleum company based in Denver. The company was formed in 2020 through a restructuring of its Canadian predecessor, Encana.
Marathon Oil Corporation is an American petroleum company that has existed since 1887. Marathon was founded in Lima, Ohio as the Ohio Oil Company. In 1899, the company was acquired by the Standard Oil Company. After the antitrust case against Jersey Standard in 1911 and subsequent breakup of its holdings, Ohio Oil once again became an independent company. In 1930, Ohio Oil acquired the Transcontinental Oil Company, which operated the "Marathon" brand of retail gasoline stations. Ohio Oil continued to use the Marathon brand, and in 1962, Ohio changed its name to the Marathon Oil Company.
Burlington Resources Inc. was a company engaged in hydrocarbon exploration. In 2006, the company was acquired by ConocoPhillips.
APA Corporation is the holding company for Apache Corporation, an American company engaged in hydrocarbon exploration. It is organized in Delaware and headquartered in Houston. The company is ranked 431st on the Fortune 500.
Energen Corporation was a company engaged in hydrocarbon exploration. In 2018, the company was acquired by Diamondback Energy.
EOG Resources, Inc. is an American energy company engaged in hydrocarbon exploration. It is organized in Delaware and headquartered in the Heritage Plaza building in Houston, Texas.
SandRidge Energy, Inc. is a company engaged in hydrocarbon exploration in the Mid-Continent region of the United States. It is organized in Delaware and headquartered in Oklahoma City, Oklahoma.
Pioneer Natural Resources Company, headquartered in Irving, Texas, was a company engaged in hydrocarbon exploration. It operated in the Cline Shale, which is part of the Spraberry Trend of the Permian Basin, where the company was the largest acreage holder. In May 2024, the company was acquired by ExxonMobil.
Plains Exploration & Production was a petroleum and natural gas exploration company based in Houston, Texas. In May 2013, it was acquired by Freeport-McMoRan.
Canadian Natural Resources Limited, or CNRL or Canadian Natural is a senior Canadian oil and natural gas company that operates primarily in the Western Canadian provinces of British Columbia, Alberta, Saskatchewan, and Manitoba, with offshore operations in the United Kingdom sector of the North Sea, and offshore Côte d'Ivoire and Gabon. The company, which is headquartered in Calgary, Alberta, has the largest undeveloped base in the Western Canadian Sedimentary Basin. It is the largest independent producer of natural gas in Western Canada and the largest producer of heavy crude oil in Canada.
Continental Resources, Inc. is a petroleum and natural gas exploration and production company headquartered in Oklahoma City. The company was founded by Harold Hamm in 1967 at the age of 21 as Shelly Dean Oil Company, originally named for Hamm's two daughters. In 1990, Shelly Dean re-branded itself as Continental Resources. It primarily used hydraulic fracturing and directional drilling to produce from low permeability formations.
Linn Energy, Inc. was a hydrocarbon exploration company based in Houston. In 2018, the company split into Roan Resources and Riviera Resources.
Vital Energy, Inc. is an American company engaged in hydrocarbon exploration incorporated in Delaware with its principal operational headquarters located in Tulsa, Oklahoma.
SM Energy Company is a company engaged in hydrocarbon exploration. It is organized in Delaware and headquartered in Denver, Colorado.
WPX Energy, Inc. was a company engaged in hydrocarbon exploration. It was organized in Delaware and headquartered in Tulsa, Oklahoma. In 2021, the company merged with Devon Energy.
Whiting Petroleum Corporation was a company engaged in hydrocarbon exploration primarily in the Bakken Formation and Three Forks Shale. It was organized in Delaware with its operational headquarters in Denver, Colorado.
Chord Energy Corporation is a company engaged in hydrocarbon exploration and hydraulic fracturing in the Williston Basin in North Dakota and Montana. It is organized in Delaware and headquartered in Houston, Texas, with an office in Williston, North Dakota. The company was formerly known as Oasis Petroleum.
Diamondback Energy, Inc. is a company engaged in hydrocarbon exploration headquartered in Midland, Texas.
Ben M. "Bud" Brigham is an American oil and gas explorer, entrepreneur, and investor.
US$4.592 billion (2019)
US$−987 million (2019)
