Energy Transfer LP provides energy-related services. The company owns and operates natural gas transportation pipeline, and natural gas storage facilities in Texas and Oklahoma; and approximately 20,090 miles of interstate natural gas pipeline. It also sells natural gas to electric utilities, independent power plants, local distribution and other marketing companies, and industrial end-users. In addition, the company owns and operates natural gas gathering pipelines, processing plant, and treating and conditioning facilities in Texas, New Mexico, West Virginia, Pennsylvania, Ohio, Oklahoma, Arkansas, Kansas, Montana, North Dakota, Wyoming, and Louisiana; natural gas gathering, oil pipeline, and oil stabilization facilities in South Texas; and transports and supplies water to natural gas producer in Pennsylvania. Further, it owns 5,700 miles of natural gas liquid (NGL) pipeline; NGL fractionation facilities; NGL storage facilities; and other NGL storage assets and terminal. Additionally, the company provides crude oil transportation, terminalling, acquisition, and marketing activities; owns and operates approximately 14,500 miles of crude oil trunk and gathering pipelines in the Southwest, Midcontinent, and Midwest United States; and sells and distributes gasoline, middle distillate, and motor fuels and other petroleum products. It also offers natural gas compression services; carbon dioxide and hydrogen sulfide removal services; and manages coal and natural resources properties, as well as sells standing timber, leases coal-related infrastructure facilities, collects oil and gas royalty, and generate electrical power. The company was formerly known as Energy Transfer Equity, L.P. and changed its name to Energy Transfer LP in October 2018. Energy Transfer LP was founded in 1996 and is headquartered in Dallas, Texas.

ONEOK, Inc. engages in gathering, processing, fractionation, storage, transportation, and marketing of natural gas and natural gas liquids (NGL) in the United States. It operates through four segments: Natural Gas Gathering and Processing, Natural Gas Liquids, Natural Gas Pipelines, and Refined Products and Crude. The company owns natural gas gathering pipelines and processing plants in the Mid-Continent and Rocky Mountain regions; and provides midstream services to producers of NGLs. It also owns NGL gathering and distribution pipelines in Oklahoma, Kansas, Texas, New Mexico, Montana, North Dakota, Wyoming, and Colorado; terminal and storage facilities in Kansas, Nebraska, Iowa, and Illinois; NGL distribution pipelines in Kansas, Nebraska, Iowa, Illinois, and Indiana; transports refined petroleum products, including unleaded gasoline and diesel; and owns and operates truck- and rail-loading, and -unloading facilities connected to NGL fractionation, storage, and pipeline assets. In addition, the company transports and stores natural gas through regulated interstate and intrastate natural gas transmission pipelines, and natural gas storage facilities. Further, it owns and operates a parking garage in downtown Tulsa, Oklahoma; and leases excess office space and rail cars. Additionally, the company transports, stores, and distributes refined products, NGLs, and crude oil, as well as conducts commodity-related activities, including liquids blending and marketing activities. It serves integrated and independent exploration and production companies; other NGL and natural gas gathering and processing companies; crude oil and natural gas production companies; utilities; industrial companies; natural gasoline distributors; propane distributors; municipalities; ethanol producers; petrochemical, refining, and marketing companies; and heating fuel users, refineries, and exporters. ONEOK, Inc. was founded in 1906 and is headquartered in Tulsa, Oklahoma.

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.

EnLink Midstream, LLC provides midstream energy services in the United States. The company operates through Permian, Louisiana, Oklahoma, North Texas, and Corporate segments. It is involved in gathering, compressing, treating, processing, transporting, storing, and selling natural gas; fractionating, transporting, storing, and selling natural gas liquids; and gathering, transporting, stabilizing, storing, trans-loading, and selling crude oil and condensate, as well as providing brine disposal services. In addition, the company's midstream energy asset network includes natural gas processing plants; fractionators; barge and rail terminals; product storage facilities; and brine disposal wells. EnLink Midstream, LLC was incorporated in 2013 and is based in Dallas, Texas.

Genesis Energy, L.P. provides integrated suite of midstream services in crude oil and natural gas industry in the United States. It operates through Offshore Pipeline Transportation, Soda and Sulfur Services, Marine Transportation, and Onshore Facilities and Transportation segments. The Offshore Pipeline Transportation segment engages in offshore crude oil and natural gas pipeline transportation and handling operations, as well as deep water pipeline servicing. This segment also owns interests in offshore crude oil and natural gas pipeline systems, platforms, and related infrastructure. The Soda and Sulfur Services segment produces, markets, and sells soda ash; and provides sulfur removal services. This segment also owns and operates soda ash production facilities, underground trona ore mines and brine solution mining operations and related equipment, and logistics and other assets; and sells sodium hydrosulfide and caustic soda to industrial and commercial companies involved in the mining of base metals. The Marine Transportation segment offers waterborne transportation of petroleum and crude oil in North America. This segment owns a fleet of 91 barges and 42 push/tow boats. The Onshore Facilities and Transportation segment offers onshore facilities and transportation services to crude oil refineries and producers by purchasing, transporting, storing, blending, and marketing crude oil and refined products; and operates trucks, trailers, railcars, and terminals and tankage in various locations along the Gulf Coast. This segment also transports crude oil, as well as owns four onshore crude oil pipeline systems and four operational crude oil rail unloading facilities. The company was incorporated in 1996 and is headquartered in Houston, Texas.

NGL Energy Partners LP engages in the transportation, storage, blending, and marketing of crude oil, natural gas liquids, refined products/renewables, and water solutions. The company operates through three segments: Water Solutions, Crude Oil Logistics, and Liquids Logistics. The Water Solutions segment transports, treats, recycles, and disposes produced and flowback water generated from crude oil and natural gas production; aggregates and sells recovered crude oil; disposes solids, such as tank bottoms, and drilling fluid and muds, as well as performs truck and frac tank washouts; and sells produced water for reuse and recycle, and brackish non-potable water. The Crude Oil Logistics segment purchases crude oil from producers and marketers, and transports it to refineries for resale at pipeline injection stations, storage terminals, barge loading facilities, rail facilities, refineries, and other trade hubs; and provides storage, terminaling, and transportation services through pipelines and storage tanks. The Liquids Logistics segment supplies natural gas liquids, refined petroleum products, and biodiesel to commercial, retail, and industrial customers in the United States and Canada through its 23 terminals, third-party storage and terminal facilities, and nine common carrier pipelines, as well as through a fleet of leased railcars. This segment also provides services for marine exports of butane through its facility located in Chesapeake, Virginia; and owns a propane pipeline in Michigan. NGL Energy Holdings LLC serves as the general partner of the company. The company was founded in 1940 and is headquartered in Tulsa, Oklahoma.

Martin Midstream Partners L.P., together with its subsidiaries, provides terminalling, processing, storage, and packaging services for petroleum products and by-products primarily in the United States. The company operates in four segments: Terminalling and Storage, Transportation, Sulfur Services, and Specialty Products. The company's Terminalling and Storage segment owns or operates various marine shore-based terminal facilities and specialty terminal facilities that provide storage, refining, blending, packaging, and handling services for producers and suppliers of petroleum products and by-products. This segment also offers land rental services to oil and gas companies, as well as storage and handling services for lubricants and fuels. Its Transportation segment operates various trucks and tank trailers; and inland marine tank barges, inland push boats, and articulated offshore tug and barge unit to transport petroleum products and by-products, petrochemicals, and chemicals. The company's Sulfur Services segment processes molten sulfur into prilled or pelletized sulfur, which is used in the production of fertilizers and industrial chemicals. Its Specialty Products segment stores, distributes, and transports natural gas liquids for wholesale deliveries to refineries, industrial natural gas liquid users, and propane retailers. Martin Midstream GP LLC serves as a general partner of the company. Martin Midstream Partners L.P. was incorporated in 2002 and is based in Kilgore, 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.