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.
Coterra Energy is a company engaged in hydrocarbon exploration organized in Delaware and based in Houston, Texas. The company has operations in the Permian Basin, Marcellus Shale, and the Anadarko Basin.
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.
Chesapeake Energy Corporation is an American exploration and production company, headquartered in Oklahoma City.
Devon Energy Corporation is a company engaged in hydrocarbon exploration in the United States. It is organized in Delaware with operational headquarters in the 50-story Devon Energy Center in Oklahoma City, Oklahoma. Its primary operations are in the Barnett Shale STACK formation in Oklahoma, Delaware Basin, Eagle Ford Group, and the Rocky Mountains.
Anadarko Petroleum Corporation was a company engaged in hydrocarbon exploration. It was organized in Delaware and headquartered in two skyscrapers in The Woodlands, Texas: the Allison Tower and the Hackett Tower, both named after former CEOs of the company. In 2019, the company was acquired by Occidental Petroleum.
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.
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.
Leor Energy was a company engaged in hydrocarbon exploration, primarily in East Texas. It was based in Houston. It sold most of its assets to Encana in November 2007 for $2.55 billion and, in September 2015, the company was acquired by Comancheria Energy Resources.
Noble Energy, Inc. was a company engaged in hydrocarbon exploration headquartered in Houston, Texas. In October 2020, the company was acquired by Chevron Corporation.
Plains Exploration & Production was a petroleum and natural gas exploration company based in Houston, Texas. In May 2013, it was acquired by Freeport-McMoRan.
Newfield Exploration Company was a petroleum, natural gas and natural gas liquids exploration and production company organized in Delaware and headquartered in Houston, Texas. In February 2019, the company was acquired by Encana.
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.
Vital Energy, Inc. is an American company engaged in hydrocarbon exploration incorporated in Delaware with its principal operational headquarters located in Tulsa, Oklahoma.
Helmerich & Payne, Inc. is an American petroleum contract drilling company engaged in oil and gas well drilling and related services for exploration and production companies headquartered in Tulsa, Oklahoma, with operations throughout the world. Their FlexRigs, introduced in 1998, have been used extensively in drilling unconventional shale formations, such as the Bakken formation in North Dakota and the Permian Basin and Eagle Ford formation in Texas. H&P is the largest on-shore driller in the United States of America with over 20% of the American land drilling market share and over 40% of the super-spec American land drilling market share.
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.
American Energy Partners, LP, also known as AELP, was an American natural gas and oil company founded in April 2013 by Aubrey K. McClendon. The company managed affiliates responsible for natural shale gas and oil production and exploration in the United States, as well as management of assets, minerals, royalties and non-operated properties. It was headquartered in Oklahoma City, Oklahoma, and employed over 450 people as of August 2015. AELP announced on May 18, 2016, two months after McClendon's death, that it would end operations and close by the end of summer 2016.
Concho Resources Inc. was a company engaged in hydrocarbon exploration, incorporated and organized in Delaware and headquartered in Midland, Texas, with operations exclusively in the Permian Basin. In 2021, the company was acquired by ConocoPhillips.
US$1.558 billion (2020)