Martin Marietta Materials, Inc., a natural resource-based building materials company, supplies aggregates and heavy-side building materials to the construction industry in the United States and internationally. It offers crushed stone, sand, and gravel products; ready mixed concrete and asphalt; paving products and services; and Portland and specialty cement for use in the infrastructure projects, and nonresidential and residential construction markets, as well as in the railroad, agricultural, utility, and environmental industries. The company also produces magnesia-based chemicals products; dolomitic lime primarily to customers for steel production and soil stabilization; and cement treated materials. Its chemical products are used in flame retardants, wastewater treatment, pulp and paper production, and other environmental applications. The company was founded in 1939 and is headquartered in Raleigh, North Carolina.

Eagle Materials Inc., through its subsidiaries, manufactures and sells heavy construction materials and light building materials in the United States. It operates in four segments: Cement, Concrete and Aggregates, Gypsum Wallboard, and Recycled Paperboard. The company engages in the mining of limestone for the manufacture, production, distribution, and sale of Portland cement, including Portland limestone cement; grinding and sale of slag; and mining of gypsum for the manufacture and sale of gypsum wallboards used to finish the interior walls and ceilings in residential, commercial, and industrial structures, as well as well as containerboard and lightweight packaging grades; manufacture and sale of recycled paperboard to the gypsum wallboard industry and other paperboard converters; the sale of readymix concrete; and mining and sale of aggregates, such as crushed stone, sand, and gravel. Its products are used in commercial and residential construction; public construction projects to build, expand, and repair roads and highways; and repair and remodel activities. The company was formerly known as Centex Construction Products, Inc. and changed its name to Eagle Materials, Inc. in January 2004. Eagle Materials Inc. was founded in 1963 and is headquartered in Dallas, Texas.

Black Stone Minerals, L.P., together with its subsidiaries, owns and manages oil and natural gas mineral interests. It owns mineral interests in approximately 16.8 million gross acres, nonparticipating royalty interests in 1.8 million gross acres, and overriding royalty interests in 1.6 million gross acres located in 41 states in the United States. The company was founded in 1876 and is based in Houston, Texas.

Minerals Technologies Inc. develops, produces, and markets various mineral, mineral-based, and related systems and services. The company operates through two segments, Consumer & Specialties, and Engineered Solutions segments. The Consumer & Specialties segment offers household and personal care products, such as pet litter, personal care, fabric care, edible oil and other fluid purification, animal health, and agricultural products; and specialty additives products, including precipitated calcium carbonate and ground calcium carbonate products that are used in the paper, paperboard, and fiber based packaging industries, as well as automotive, construction, and table and food applications. This segment produces limestone and dolomitic limestone used in construction, automotive, and consumer markets for packaging applications. The Engineered Solutions segment provides high-temperature technology products consisting of custom-blended mineral and non-mineral products for casting auto parts, farm and construction equipment, oil and gas production equipment, power generation turbine castings, and rail car components; and environmental and infrastructure products comprising geosynthetic clay lining systems, vapor intrusion mitigation products, sub surface waterproofing systems, green roofs, wastewater remediation, drinking water purification technologies, and drilling products. In addition, this segment provides chromite products; gunnable monolithic refractory products and application systems; monolithic refractory materials and pre-cast refractory shapes; refractory shapes and linings; carbon composite and pyrolitic graphite; and filtration and well testing services. It markets its products primarily through its direct sales force, as well as regional distributors. The company serves in the United States, Canada, Latin America, Europe, Africa, and Asia. Minerals Technologies Inc. was incorporated in 1968 and is headquartered in New York, New York.

Dorchester Minerals, L.P. engages in the acquisition, ownership, and administration of royalty properties in the United States. Its royalty properties include producing and nonproducing mineral, royalty, overriding royalty, net profits, and leasehold interests in 593 counties and parishes in 28 states; and net profits interests represent net profits overriding royalty interests in various properties owned by the operating partnership. Dorchester Minerals Management LP serves as the general partner of Dorchester Minerals, L.P. The company was founded in 1982 and is based in Dallas, Texas.

Kimbell Royalty Partners, LP, together with its subsidiaries, engages in acquiring and owning mineral and royalty interests in oil and natural gas properties in the United States. It serves as the general partner of the company. The company was incorporated in 2015 and is based in Fort Worth, Texas.

PHX Minerals Inc. operates as a natural gas and oil mineral company in the United States. The company produces and sells natural gas, crude oil, and natural gas liquids. Its principal properties are located in Oklahoma, Texas, Louisiana, North Dakota, and Arkansas. The company sells its products to various purchasers, including pipeline and marketing companies. The company was formerly known as Panhandle Oil and Gas Inc. and changed its name to PHX Minerals Inc. in October 2020. PHX Minerals Inc. was founded in 1926 and is headquartered in Fort Worth, Texas.

U.S. Silica Holdings, Inc. produces and sells commercial silica in the United States. It operates through two segments: Oil & Gas Proppants and Industrial & Specialty Products. The company offers whole grain commercial silica products to be used as frac for oil and natural gas recovery, as well as sells its whole grain silica products for the manufacturing of glass products. It also provides various grades of whole-grain round silica to the foundry industry; ground silica and industrial minerals products used for various products; and engineered performance materials made from diatomaceous earth (DE), clay, and perlite. In addition, the company offers transportation, equipment rental, and contract labor services. It serves oilfield services companies, and exploration and production companies that are engaged in hydraulic fracturing, building and construction products, chemicals, fillers and extenders, filtration, glass, sports, recreation, and industrial and specialty products end markets. The company was formerly known as GGC USS Holdings Inc. and changed its name to U.S. Silica Holdings, Inc. in July 2011. U.S. Silica Holdings, Inc. was founded in 1894 and is headquartered in Katy, Texas.