Exxon Mobil Corporation engages in the exploration and production of crude oil and natural gas in the United States and internationally. It operates through Upstream, Energy Products, Chemical Products, and Specialty Products segments. The Upstream segment explores for and produces crude oil and natural gas. The Energy Products segment offers fuels, aromatics, and catalysts, as well as licensing services. It sells its products under the Exxon, Esso, and Mobil brands. The Chemical Products segment manufactures and markets petrochemicals including olefins, polyolefins, and intermediates. The Specialty Products segment offers performance products, including lubricants, basestocks, waxes, synthetics, elastomers, and resins. The company also involves in the manufacturing, trade, transport, and sale of crude oil, natural gas, petroleum products, petrochemicals, and other specialty products; and pursuit lower-emission business opportunities, including carbon capture and storage, hydrogen, lower-emission fuels, and lithium. Exxon Mobil Corporation was founded in 1870 and is based in Spring, Texas.

ConocoPhillips explores for, produces, transports, and markets crude oil, bitumen, natural gas, liquefied natural gas (LNG), and natural gas liquids in the United States, Canada, China, Libya, Malaysia, Norway, the United Kingdom, and internationally. The company's portfolio includes unconventional plays in North America; conventional assets in North America, Europe, Asia, and Australia; global LNG developments; oil sands assets in Canada; and an inventory of global exploration prospects. ConocoPhillips was founded in 1917 and is headquartered in Houston, Texas.

Occidental Petroleum Corporation, together with its subsidiaries, engages in the acquisition, exploration, and development of oil and gas properties in the United States, the Middle East, and North Africa. It operates through three segments: Oil and Gas, Chemical, and Midstream and Marketing. The company's Oil and Gas segment explores for, develops, and produces oil and condensate, natural gas liquids (NGLs), and natural gas. Its Chemical segment manufactures and markets basic chemicals, including chlorine, caustic soda, chlorinated organics, potassium chemicals, ethylene dichloride, chlorinated isocyanurates, sodium silicates, and calcium chloride; and vinyls comprising vinyl chloride monomer, polyvinyl chloride, and ethylene. The Midstream and Marketing segment gathers, processes, transports, stores, purchases, and markets oil, condensate, NGLs, natural gas, carbon dioxide, and power. This segment also invests in entities. Occidental Petroleum Corporation was founded in 1920 and is headquartered in Houston, Texas.

Plains All American Pipeline, L.P., through its subsidiaries, engages in the pipeline transportation, terminaling, storage, and gathering of crude oil and natural gas liquids (NGL) in the United States and Canada. The company operates through two segments, Crude Oil and NGL. The Crude Oil segment offers gathering and transporting crude oil through pipelines, gathering systems, trucks, and on barges or railcars. This segment provides terminaling, storage, and other facilities-related services, as well as merchant activities. The NGL segment is involved in natural gas processing and NGL fractionation, storage, transportation, and terminaling. This segment also includes ethane, propane, normal butane, iso-butane, and natural gasoline derived from natural gas production and processing activities, as well as crude oil refining processes. Its NGL components are used for various applications, such as heating, engine, and industrial fuels. The company was founded in 1981 and is headquartered in Houston, Texas. Plains All American Pipeline, L.P. operates as a subsidiary of Plains GP Holdings, L.P.

National Fuel Gas Company operates as a diversified energy company. It operates through four segments: Exploration and Production, Pipeline and Storage, Gathering, and Utility. The Exploration and Production segment explores for, develops, and produces natural gas and oil. The Pipeline and Storage segment provides interstate natural gas transportation services through an integrated gas pipeline system in Pennsylvania and New York; and storage services through its underground natural gas storage fields. This segment also transports and stores natural gas for National Fuel Gas Distribution Corporation, as well as for utilities, industrial companies, and power producers in New York State. The Gathering segment builds, owns, and operates gathering facilities in the Appalachian region, as well as provides gathering services to Seneca. The Utility segment sells natural gas to retail customers; and provides natural gas utility services to various customers in Buffalo, Niagara Falls, and Jamestown, New York, as well as in Erie and Sharon, Pennsylvania. National Fuel Gas Company was incorporated in 1902 and is headquartered in Williamsville, New York.

Hess Midstream LP owns, develops, operates, and acquires midstream assets and provide fee-based services to Hess and third-party customers in the United States. It operates through three segments: Gathering; Processing and Storage; and Terminaling and Export. The Gathering segment owns natural gas gathering and compression systems; crude oil gathering systems; and produced water gathering and disposal facilities. Its gathering systems consists of approximately 1,410 miles of high and low pressure natural gas and natural gas liquids gathering pipelines with capacity of approximately 660 million cubic feet per day; crude oil gathering system comprises approximately 570 miles of crude oil gathering pipelines; and produced water gathering system that includes approximately 300 miles of pipelines in gathering systems. The Processing and Storage segment comprises Tioga Gas Plant, a natural gas processing and fractionation plant located in Tioga, North Dakota; a 50% interest in the Little Missouri 4 gas processing plant located in south of the Missouri River in McKenzie County, North Dakota; and Mentor Storage Terminal, a propane storage cavern and rail, and truck loading and unloading facility located in Mentor, Minnesota. The Terminaling and Export segment owns Ramberg terminal facility; Tioga rail terminal; crude oil rail cars; and other Dakota access pipeline connections, as well as Johnson's Corner Header System, a crude oil pipeline header system. Hess Midstream LP was founded in 2014 and is based in Houston, Texas.

Tellurian Inc. engages in the natural gas business worldwide. It operates through three segments: The Upstream, The Midstream, and The Marketing & Trading. The company produces, gathers, purchases, sells, and delivers natural gas; acquires and develops natural gas assets; and develops, constructs, and operates liquefied natural gas terminals and pipelines. The company was incorporated in 1957 and is headquartered in Houston, Texas.

Adams Resources & Energy, Inc., through its subsidiaries, primarily engages in the marketing, transportation, terminalling, and storage of crude oil and other related products in the United States. The company operates through four segments: Crude Oil Marketing, Transportation, Pipeline and Storage, and Logistics and Repurposing. It purchases and sells crude oil to refiners and other customers primarily onshore in Texas, North Dakota, Michigan, Wyoming, Colorado, and Louisiana; owns and operates a fleet of 164 tractor-trailer rigs; and maintains pipeline inventory locations and injection stations. The company also transports liquid chemicals, pressurized gases, asphalt, and dry bulk on a hire basis in the United States, Canada, and Mexico; and operates truck terminals in Houston, Corpus Christi, Nederland, Freeport, Baton Rouge, St. Rose, Sterlington, Jacksonville, Tampa, Augusta, Mobile, Charlotte, Cincinnati, South Charleston, Memphis, East St. Louis, and Joliet. In addition, it operates crude oil and condensate pipeline system, which connects the Eagle Ford Basin to the Gulf Coast waterborne market; and transports crude oil, condensate, fuels, oils, and other petroleum products on a for hire basis in the Eagle Ford basin. The company was founded in 1947 and is headquartered in Houston, Texas.