Anadarko Petroleum is an independent exploration and production company. The company also participates in the hard-minerals business through royalty arrangements. The company's reporting segments are as follows: Exploration and Production, which is engaged in the exploration, development, production, and sale of oil, natural gas, and natural-gas liquids (NGLs) and in advancing its Mozambique liquefied natural gas project toward final investment decision; and WES Midstream and Other Midstream, in which these two segments engage in gathering, processing, treating, and transporting the company and third-party oil, natural-gas, and NGL production as well as gathering and disposal of produced water.

EOG Resources, together with its subsidiaries, explores for, develops, produces and markets crude oil, natural gas liquids and natural gas primarily in main producing basins in the United States, The Republic of Trinidad and Tobago, The People's Republic of China, Canada and, from time to time, select other international areas.

Marathon Oil is an independent exploration and production company focused on the United States resource plays. The company also has international operations in Equatorial Guinea (E.G.). The company's segments are: United States, which explores for, produces and markets crude oil and condensate, natural gas liquids (NGLs) and natural gas in the United States; and International, which explores for, produces and markets crude oil and condensate, NGLs and natural gas outside of the United States as well as produces and markets products manufactured from natural gas, such as liquefied natural gas and methanol, in E.G.