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.

Targa Resources Corp., together with its subsidiary, Targa Resources Partners LP, owns, operates, acquires, and develops a portfolio of complementary domestic midstream infrastructure assets in North America. It operates in two segments, Gathering and Processing, and Logistics and Transportation. The company is involved in gathering, compressing, treating, processing, transporting, and selling natural gas; storing, fractionating, treating, transporting, and selling natural gas liquids (NGL) and NGL products, including services to liquefied petroleum gas exporters; and gathering, storing, terminaling, purchasing, and selling crude oil. It is also involved in the purchase and resale of NGL products; and sale of propane, as well as provision of related logistics services to multi-state retailers, independent retailers, and other end-users. In addition, the company offers NGL balancing services; and transportation services to refineries and petrochemical companies in the Gulf Coast area, as well as purchases, markets, and resells natural gas. As of December 31, 2023, it leased and managed approximately 605 railcars; 137 tractors; and 6 vacuum trucks and 2 pressurized NGL barges. Targa Resources Corp. was incorporated in 2005 and is headquartered in Houston, Texas.

Natural Resource Partners L.P., together with its subsidiaries, owns, manages, and leases a portfolio of mineral properties in the United States. It operates in two segments, Mineral Rights and Soda Ash. The company owns interests in coal, soda ash, trona, and other natural resources. Its coal reserves are primarily located in the Appalachia Basin, the Illinois Basin, and the Northern Powder River Basin in the United States; industrial minerals and aggregates properties located in the United States; and oil and gas properties located in Louisiana. The company leases a portion of its reserves in exchange for royalty payments; and owns and leases transportation and processing infrastructure related to coal properties. NRP (GP) LP serves as the general partner of the company. Natural Resource Partners L.P. was incorporated in 2002 and is headquartered in Houston, Texas.

LandBridge Company LLC owns and manages land and resources to support and enhance oil and natural gas development in the United States. It owns surface acres in and around the Delaware Basin in Texas and New Mexico. The company holds a portfolio of oil and gas royalties. It also sells brackish water and other surface composite materials. The company was founded in 2021 and is based in Houston, Texas. LandBridge Company LLC operates as a subsidiary of LandBridge Holdings LLC.

Permian Basin Royalty Trust, an express trust, holds royalty interests in various oil and gas properties in the United States. The company holds a 75% net overriding royalty interest in the Waddell Ranch properties, including Dune, Sand Hills (Judkins), Sand Hills (McKnight), Sand Hills (Tubb), University-Waddell (Devonian) and Waddell fields in Crane County, Texas. It also holds a 95% net overriding royalty in the Texas Royalty properties, which consist of various producing oil fields, such as Yates, Wasson, Sand Hills, East Texas, Kelly-Snyder, Panhandle Regular, N. Cowden, Todd, Keystone, Kermit, McElroy, Howard-Glasscock, Seminole, and others located in Texas. Its Texas Royalty properties comprise approximately 125 separate royalty interests containing approximately 51,000 net producing acres. The company was founded in 1980 and is based in Dallas, Texas.

PrimeEnergy Resources Corporation, through its subsidiaries, engages in acquisition, development, and production of oil and natural gas properties in the United States. The company owns leasehold, mineral, and royalty interests in producing and non-producing oil and gas properties; and operates approximately 534 active wells and owns non-operating interests and royalties in 952 additional wells. It also acquires producing oil and gas properties through joint ventures with industry partners; and provides contract services to third parties, including well-servicing support, site-preparation, and construction services for oil and gas drilling and reworking operations. The company was formerly known as PrimeEnergy Corporation and changed its name to PrimeEnergy Resources Corporation in December 2018. PrimeEnergy Resources Corporation was incorporated in 1973 and is headquartered in Houston, Texas.

San Juan Basin Royalty Trust operates as an express trust in Texas. The company has a 75% net overriding royalty interest in Southland's oil and natural gas interests in properties located in the San Juan Basin in northwestern New Mexico. It also owns subject interests consist of working interests, royalty interests, overriding royalty interests, and other contractual rights in 119,000 net-producing acres in San Juan, Rio Arriba, and Sandoval Counties of northwestern New Mexico. The company was founded in 1980 and is based in Dallas, Texas.

PermRock Royalty Trust operates as a statutory trust. It owns interests in the oil and natural gas producing properties. The company's underlying properties include 22,394 net acres in the Permian Basin. The company was founded in 2017 and is based in Dallas, Texas.