Magellan Midstream Partners, L.P. engages in the transportation, storage, and distribution of refined petroleum products and crude oil in the United States. The company operates through Refined Products and Crude Oil segments. It operates refined products pipeline that transports gasoline, diesel fuel, aviation fuel, kerosene, and heating oil to refiners, wholesalers, retailers, traders, railroads, airlines, and regional farm cooperatives; and to end markets, including retail gasoline stations, truck stops, farm cooperatives, railroad fueling depots, military bases, and commercial airports. The company also provides pipeline capacity and tank storage services, as well as terminalling, ethanol and biodiesel unloading and loading, additive injection, custom blending, laboratory testing, and data services to shippers. In addition, Magellan Midstream Partners, L.P. owns and operates crude oil pipelines and storage facilities; and marine terminals located along coastal waterways that provide distribution, storage, blending, inventory management, and additive injection services for refiners, marketers, traders, and other end users of petroleum products. As of December 31, 2019, it had 9,800-mile refined products pipeline system with 54 terminals, as well as 25 independent terminals; approximately 2,200 miles of crude oil pipelines and storage facilities with an aggregate storage capacity of approximately 37 million barrels; and 2 marine terminals. Magellan Midstream Partners, L.P. was founded in 2000 and is headquartered in Tulsa, Oklahoma.

Smart Sand, Inc., an integrated frac sand supply and services company, engages in the excavation, processing, and sale of sands or proppant for use in hydraulic fracturing operations in the oil and gas industry in the United States. It also operates SmartSystems, a wellsite proppant storage solution; and offers logistics services. The company sells its products primarily to oil and natural gas exploration and production companies, and oilfield service companies. As of December 31, 2020, it had approximately 315 million tons of proven recoverable sand reserves. Smart Sand, Inc. was incorporated in 2011 and is headquartered in The Woodlands, Texas.

Warrego Energy Limited engages in the exploration and development of oil and gas properties. The company holds interest in the EP469 basin covering an area of 224 square kilometers; and interests in the STP-EPA-0127 basin, which comprises an area of 8,700 square kilometers located in Perth Basin, Western Australia. It also holds interests in the Tesorillo project, which include two petroleum exploration licenses, such as the Tesorillo and Ruedalabola permits covering an area of 38,000 hectares in Spain; and the El Romeral property, an integrated gas production and power station comprising of three production licenses located in the Guadalquivir basin, southern Spain. The company was incorporated in 2007 and is headquartered in Perth, Australia.

Phillips 66 Partners LP owns, operates, develops, and acquires midstream assets. It offers transportation, terminaling, processing, stevedoring, storage, and fractionation of crude oil, refined petroleum products, and natural gas liquids. The company was founded in 2013 and is headquartered in Houston, Texas. Phillips 66 Partners LP is a subsidiary of Phillips 66 Project Development Inc.

HollyFrontier Corporation operates as an independent petroleum refiner in the United States. The company operates through three segments: Refining, Lubricants and Specialty Products, and HEP. It primarily produces high-value light products, such as gasoline, diesel and jet fuel, and specialty lubricant products, as well as specialty and modified asphalt. The company offers its products to other refiners, convenience store chains, independent marketers, retailers, truck stop chains, wholesalers, railroads, governmental entities, and paving contractors or manufacturers, as well as for commercial airline use. It owns and operates 4 refineries with a combined crude oil processing capacity of approximately 405,000 barrels per day in El Dorado, Kansas; Tulsa, Oklahoma; Artesia, New Mexico; and Woods Cross, Utah. The company also owns and operates vacuum distillation and other facilities in Lovington, New Mexico, as well as asphalt terminals in Arizona, New Mexico, and Oklahoma. Its refineries serve markets in the Mid-Continent, Southwest, and Rocky Mountain regions of the United States. In addition, HollyFrontier Corporation produces base oils and other specialized lubricant products; and owns and operates logistic assets consisting of petroleum product and crude oil pipelines, terminals, tankage, loading rack facilities, and refinery processing units. The company was formerly known as Holly Corporation and changed its name to HollyFrontier Corporation as a result of its merger with Frontier Oil Corporation in July 2011. HollyFrontier Corporation was incorporated in 1947 and is headquartered in Dallas, Texas.

Schlumberger Limited provides technology for the energy industry worldwide. The company operates through four divisions: Digital & Integration, Reservoir Performance, Well Construction, and Production Systems. It offers software, information management, and IT infrastructure services; consulting services for reservoir characterization, field development planning, and production enhancement; petro technical data services and training solutions; reservoir interpretation and data processing services; asset performance solutions; open and cased-hole services; exploration and production pressure and flow-rate measurement services; pressure pumping, well stimulation, and coiled tubing equipment for downhole mechanical well intervention, reservoir monitoring, and downhole data acquisition; and integrated production systems. The company also provides mud logging and engineering support services; drilling equipment and services for shipyards, drilling contractors, energy companies, and rental tool companies; land drilling rigs and related services; drilling tools; well cementing products and services; and well planning and drilling, engineering, supervision, logistics, procurement, contracting, and drilling rig management services, as well as supplies engineered drilling fluid systems; and designs, manufactures, and markets roller cone and fixed cutter drill bits. In addition, it offers well completion services and equipment; artificial lift production equipment and optimization services; valves; process systems; and integrated subsea production systems comprising wellheads, subsea trees, manifolds and flowline connectors, control systems, connectors, and services, as well as designs and manufactures onshore and offshore platform wellhead systems and processing solutions. The company was formerly known as Socie´te´ de Prospection E´lectrique. Schlumberger Limited was founded in 1926 and is based in Houston, Texas.

Kimbell Royalty Partners, LP, together with its subsidiaries, acquires and owns mineral and royalty interests in oil and natural gas properties in the United States. As of February 26, 2021, the company owned mineral and royalty interests in approximately 13 million gross acres and overriding royalty interests in approximately 4.6 million gross acres. Its mineral and royalty interests are located in 28 states and include ownership in approximately 97,000 gross producing wells, including approximately 41,000 wells in the Permian Basin. Kimbell Royalty GP, LLC serves as the general partner of the company. Kimbell Royalty Partners, LP was founded in 2013 and is based in Fort Worth, Texas.

United Utilities Group PLC provides water and wastewater services in the United Kingdom. It is also involved in renewable energy generation, corporate trustee, financing, and property management activities; and the provision of waste treatment, consulting, and project management services. The company operates 42,000 kilometers of water pipes; 78,000 km of wastewater pipes; 567 wastewater treatment works; and 88 water treatment works. It serves 3 million households and 200,000 business customers. United Utilities Group PLC was incorporated in 2008 is based in Warrington, the United Kingdom.