Marathon Oil Corporation, an independent exploration and production company, engages in exploration, production, and marketing of crude oil and condensate, natural gas liquids, and natural gas in the United States and internationally. The company also produces and markets products manufactured from natural gas, such as liquefied natural gas and methanol. In addition, it owns and operates Sugarloaf gathering system, a natural gas pipeline. The company was formerly known as USX Corporation and changed its name to Marathon Oil Corporation in December 2001. Marathon Oil Corporation was founded in 1887 and is headquartered in Houston, Texas. As of November 22, 2024, Marathon Oil Corporation operates as a subsidiary of ConocoPhillips.

Ovintiv Inc., together with its subsidiaries, explores, develops, produces, and markets natural gas, oil, and natural gas liquids in the United States and Canada. The company operates through USA Operations, Canadian Operations, and Market Optimization segments. Its principal assets include Permian in west Texas and Anadarko in west-central Oklahoma; and Montney in northeast British Columbia and northwest Alberta. In addition, the company's upstream assets comprise Bakken in northwest North Dakota, and Uinta in central Utah; and Horn River in northeast British Columbia. The company was formerly known as Encana Corporation and changed its name to Ovintiv Inc. in January 2020. Ovintiv Inc. was incorporated in 2020 and is based in Denver, Colorado.

Murphy Oil Corporation, together with its subsidiaries, operates as an oil and gas exploration and production company in the United States, Canada, and internationally. It explores for and produces crude oil, natural gas, and natural gas liquids. The company was formerly known as Murphy Corporation and changed its name to Murphy Oil Corporation in 1964. The company was incorporated in 1950 and is headquartered in Houston, Texas.

Veren Inc. explores, develops, and produces oil and gas properties in Canada and the United States. The company focuses on crude oil, tight oil, natural gas liquids, shale gas, and natural gas reserves. Its properties are located in the provinces of Saskatchewan, Alberta, British Columbia, and Manitoba; and the states of North Dakota. The company was formerly known as Crescent Point Energy Corp. and changed its name to Veren Inc. in May 2024. Veren Inc. was incorporated in 1994 and is headquartered in Calgary, Canada.

Gulfport Energy Corporation engages in the acquisition, exploration, development, and production of natural gas, crude oil, and natural gas liquids in the United States. Its principal properties include Utica and Marcellus in eastern Ohio; and the SCOOP Woodford and Springer formations in central Oklahoma. The company was incorporated in 1997 and is headquartered in Oklahoma City, Oklahoma.

Enerplus Corporation, together with its subsidiaries, explores and develops crude oil and natural gas in the United States. Its oil and natural gas properties are located primarily in North Dakota, Colorado, and Pennsylvania. The company was founded in 1986 and is headquartered in Calgary, Canada.