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.

Apache is an independent energy company that explores for, develops, and produces natural gas, crude oil, and natural gas liquids. The company had exploration and production operations in United States, Egypt, and offshore United Kingdom in the North Sea. The company also has exploration interests in Suriname. The company markets its United States crude oil production to main oil companies, marketing, and transportation companies, and refiners based on a West Texas Intermediate price or other regional pricing indices. The company has two international regions: The Egypt includes onshore conventional assets in Egypt's Western Desert. The North Sea region includes offshore assets based in United Kingdom.

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.

Noble Energy is an independent energy company, engaged in crude oil and natural gas exploration and production. The company's operating areas include: U.S. onshore, primarily the DJ Basin, Delaware Basin and Eagle Ford Shale; U.S. offshore Gulf of Mexico; Eastern Mediterranean; and West Africa. The company's Midstream segment develops, owns, operates and acquires domestic midstream infrastructure assets, or invests in other midstream entities, with existing focus areas being the DJ and Delaware Basins. The company's activities include geophysical and geological evaluation; analysis of commercial, regulatory and political risks; and exploratory and development drilling leading to production, where appropriate.

Occidental Petroleum has three reporting segments: oil and gas, which explores for, develops and produces oil and condensate, natural gas liquids (NGL) and natural gas; chemical, which mainly manufactures and markets basic chemicals (chlorine, caustic soda, chlorinated organics, potassium chemicals, ethylene dichloride, chlorinated isocyanurates, sodium silicates and calcium chloride) and vinyls (vinyl chloride monomer, polyvinyl chloride and ethylene); and marketing and midstream, which purchases, markets, gathers, processes, transports and stores oil, condensate, NGL, natural gas, carbon dioxide and power.