Canadian Natural Resources Limited acquires, explores for, develops, produces, markets, and sells crude oil, natural gas, and natural gas liquids (NGLs). The company offers light and medium crude oil, primary heavy crude oil, Pelican Lake heavy crude oil, bitumen (thermal oil), and synthetic crude oil (SCO). The company's midstream assets include two pipeline systems; and a 50% working interest in an 84-megawatt cogeneration plant at Primrose. It operates primarily in Western Canada; the United Kingdom portion of the North Sea; and Offshore Africa. The company was formerly known as AEX Minerals Corporation and changed its name to Canadian Natural Resources Limited in December 1975. Canadian Natural Resources Limited was incorporated in 1973 and is headquartered in Calgary, Canada.

Cenovus Energy Inc., together with its subsidiaries, develops, produces, refines, transports, and markets crude oil, natural gas, and refined petroleum products in Canada and internationally. The company operates through Oil Sands, Conventional, Offshore, Canadian Refining, and U.S. Refining segments. The Oil Sands segment develops and produces bitumen and heavy oil in northern Alberta and Saskatchewan. This segment assets include Foster Creek, Christina Lake, and Sunrise projects, as well as Lloydminster thermal and conventional heavy oil assets. The Conventional segment holds natural gas liquids and natural gas assets primarily located in Elmworth-Wapiti, Kaybob-Edson, Clearwater, and Rainbow Lake operating in Alberta and British Columbia, as well as interests in various natural gas processing facilities. The offshore segment engages in offshore operation, exploration, and development activities in China and the East Coast of Canada. The Canadian Refining segment owns and operates Lloydminster upgrading and asphalt refining complex, which converts heavy oil and bitumen into synthetic crude oil, diesel, asphalt, and other ancillary products, as well as Bruderheim crude-by-rail terminal and ethanol plants. The U.S. Refining segment refines crude oil to produce gasoline, diesel, jet fuel, asphalt, and other products. Cenovus Energy Inc. is headquartered in Calgary, Canada.

Baytex Energy Corp., an energy company, engages in the acquisition, development, and production of crude oil and natural gas in the Western Canadian Sedimentary Basin and in the Eagle Ford, the United States. The company offers light oil and condensate, heavy oil, natural gas liquids, and natural gas. It also holds interest in the Eagle Ford property in Texas; Viking and Lloydminster properties in Alberta and Saskatchewan; and Peace River and Duvernay properties in Alberta. Baytex Energy Corp. was incorporated in 1993 and is headquartered in Calgary, Canada.

Vermilion Energy Inc., together with its subsidiaries, engages in the acquisition, exploration, development, and production of petroleum and natural gas. The company has properties in West Central Alberta, southeast Saskatchewan, Manitoba, and West Pembina in Canada; Wyoming in the United States; southwest Bordeaux and Paris Basin in France; the Netherlands; Germany; Ireland; Croatia; Slovakia; and Australia. The company was founded in 1994 and is headquartered in Calgary, Canada.

Gran Tierra Energy Inc., together with its subsidiaries, engages in the exploration and production of oil and gas properties in Colombia and Ecuador. The company was founded in 2003 and is headquartered in Calgary, Canada.

Crescent Point Energy Corp. 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. Crescent Point Energy Corp. was incorporated in 1994 and is headquartered in Calgary, Canada.

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.

Obsidian Energy Ltd. engages in the exploration, production, and development of oil and natural gas properties in the Western Canada. The company was formerly known as Penn West Petroleum Ltd. and changed its name to Obsidian Energy Ltd. in June 2017. Obsidian Energy Ltd. is headquartered in Calgary, Canada.