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Continental Resources, Inc. is an independent oil producer engaged in the exploration, development, and production of crude oil and natural gas. The firm's operations include horizontal drilling and protecting groundwater. The company was founded by Harold G. Hamm in 1967 and is headquartered in Oklahoma City, OK.

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.

Devon Energy Corporation, an independent energy company, engages in the exploration, development, and production of oil, natural gas, and natural gas liquids in the United States. It operates in Delaware, Eagle Ford, Anadarko, Williston, and Powder River Basins. The company was founded in 1971 and is headquartered in Oklahoma City, Oklahoma.

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.