Sabine Royalty Trust holds royalty and mineral interests in various producing oil and gas properties in the United States. Its royalty and mineral interests include landowner's royalties, overriding royalty interests, minerals, production payments, and other similar non-participatory interest in certain producing and proved undeveloped oil and gas properties located in Florida, Louisiana, Mississippi, New Mexico, Oklahoma, and Texas. Sabine Royalty Trust was founded in 1982 and is based in Dallas, Texas.

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.

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.

MV Oil Trust acquires and holds term net profits interests in the oil and natural gas properties of MV Partners, LLC. Its properties wells located in the Mid-Continent region in the states of Kansas and Colorado. MV Oil Trust was incorporated in 2006 and is based in Houston, Texas.

Cross Timbers Royalty Trust operates as an express trust in the United States. It holds 90% net profits interests in certain producing and nonproducing royalty and overriding royalty interest properties in Texas, Oklahoma, and New Mexico; and 75% net profits working interest in four properties in Texas and three properties in Oklahoma. The company was founded in 1991 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.

Marine Petroleum Trust, together with its subsidiary, Marine Petroleum Corporation, operates as a royalty trust in the United States. It has overriding royalty interest in oil and natural gas leases in the Central and Western areas of the Gulf of Mexico off the coasts of Louisiana and Texas. Marine Petroleum Trust was founded in 1956 and is based in Dallas, Texas.

Mexco Energy Corporation, an independent oil and gas company, engages in the acquisition, exploration, development, and production of natural gas, crude oil, condensate, and natural gas liquids in the United States. It owns partial interests in wells located in the states of Texas, New Mexico, Oklahoma, Louisiana, Alabama, Mississippi, Arkansas, Wyoming, Kansas, Colorado, Montana, Virginia, North Dakota, and Ohio. It also owns leasehold mineral, royalty, and other interests. The company was formerly known as Miller Oil Company and changed its name to Mexco Energy Corporation in April 1980. Mexco Energy Corporation was incorporated in 1972 and is based in Midland, Texas.