Marathon Oil Corporation, an independent exploration and production company, engages in exploration, production, and marketing of crude oil and condensate, natural gas liquids, and natural gas in the United States and internationally. The company also produces and markets products manufactured from natural gas, such as liquefied natural gas and methanol. In addition, it owns and operates Sugarloaf gathering system, a natural gas pipeline. The company was formerly known as USX Corporation and changed its name to Marathon Oil Corporation in December 2001. Marathon Oil Corporation was founded in 1887 and is headquartered in Houston, Texas. As of November 22, 2024, Marathon Oil Corporation operates as a subsidiary of ConocoPhillips.

Archrock, Inc., together with its subsidiaries, operates as an energy infrastructure company in the United States. The company operates in two segments, Contract Operations and Aftermarket Services. It engages in the designing, sourcing, owning, installing, operating, servicing, repairing, and maintaining of its owned fleet of natural gas compression equipment to provide natural gas compression services. The company also sells over-the-counter parts and components; and provides operations, major and routine maintenance, overhaul, and reconfiguration services to customers who own compression equipment. It serves integrated and independent oil and natural gas processors, gatherers, and transporters. The company was formerly known as Exterran Holdings, Inc. and changed its name to Archrock, Inc. in November 2015. Archrock, Inc. was founded in 1990 and is headquartered in Houston, Texas.

United States Lime & Minerals, Inc. manufactures and supplies lime and limestone products in the United States. It extracts limestone from open-pit quarries and an underground mine, and processes it as pulverized limestone, quicklime, hydrated lime, and lime slurry. The company supplies its products primarily to the construction customers, including highway, road, and building contractors; industrial customers, such as paper and glass manufacturers; environmental customers comprising municipal sanitation and water treatment facilities, and flue gas treatment processes; oil and gas services companies; roof shingle manufacturers; and poultry producers. In addition, it has various royalty interests with respect to oil and gas rights in natural gas wells located in Johnson County, Texas in the Barnett Shale Formation. The company was incorporated in 1950 and is headquartered in Dallas, Texas. United States Lime & Minerals, Inc. operates as a subsidiary of Inberdon Enterprises Ltd.

Patterson-UTI Energy, Inc., through its subsidiaries, engages in the provision of contract drilling services to oil and natural gas operators in the United States and internationally. It operates through three segments: Drilling Services, Completion Services, and Drilling Products. The Contract Drilling Services segment provides contract and directional drilling services in onshore oil and natural gas basins, as well as engages in the service and re-certification of equipment for drilling contractors, and provision of electrical controls and automation to the energy, marine and mining industries. The Completion Services segment offers services for hydraulic fracturing, wireline and pumping, completion support, and cementing; and involved in the power solutions natural gas fueling, and logistics and storage businesses. The Drilling Products segment manufactures and distributes drill bits for energy and mining markets. It also provides software and services, such as MWD Survey FDIR, a data analytics technology to analyze MWD survey data in real-time and identify the position of a well; HiFi Nav, which enhances FDIR by targeting improved vertical placement of the directional well within the reservoir; HiFi Guidance, utilizes trajectory optimization to determine optimal steering recommendations and placement within the reservoir; and rents oilfield tools. The company was founded in 1978 and is headquartered in Houston, Texas.

ProFrac Holding Corp. operates as a technology-focused energy services holding company in the United States. It operates through three segments: Stimulation Services, Manufacturing, and Proppant Production. The company offers hydraulic fracturing, well stimulation, in-basin frac sand, and other completion services and complementary products and services to upstream oil and natural gas companies engaged in the exploration and production of unconventional oil and natural gas resources. It also manufactures and sells high horsepower pumps, valves, piping, swivels, large-bore manifold systems, and fluid ends. ProFrac Holding Corp. was founded in 2016 and is headquartered in Willow Park, Texas.

Core Laboratories Inc. provides reservoir description and production enhancement services and products to the oil and gas industry in the United States, and internationally. It operates through Reservoir Description and Production Enhancement segments. The Reservoir Description segment includes the characterization of petroleum reservoir rock and reservoir fluid samples to enhance production and improve recovery of crude oil and gas from its clients' reservoirs. It offers laboratory-based analytical and field services to characterize properties of crude oil and oil delivered products; and proprietary and joint industry studies, as well as services that support carbon capture, utilization and storage, geothermal projects, and the evaluation and appraisal of mining activities. The Production Enhancement segment provides services and products relating to reservoir well completions, perforations, stimulations, production, and well abandonment. It offers integrated diagnostic services to evaluate and monitor the effectiveness of well completions and to develop solutions to improve the effectiveness of enhanced oil recovery projects. The company markets and sells its products through a combination of sales representatives, technical seminars, trade shows, and print advertising, as well as through distributors. Core Laboratories Inc. was founded in 1936 and is based in Houston, Texas.

Smart Sand, Inc., an integrated frac and industrial 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 provides proppant logistics services; and wellsite storage solutions through SmartSystems products and services. The company sells its products primarily to oil and natural gas exploration and production companies, oilfield service companies, and industrial manufacturers. Smart Sand, Inc. was incorporated in 2011 and is headquartered in Spring, Texas.

NCS Multistage Holdings, Inc. provides engineered products and support services for oil and natural gas well completions and construction, and field development strategies in the United States, Canada, and internationally. It offers fracturing systems, which include casing-installed sliding sleeves, downhole frac isolation assemblies, and sand jet perforating products; enhanced recovery products, such as sliding sleeve, as well as Terrus system, an injection control device; repeat precision products comprising composite frac plugs and bridge plugs, single-use disposable setting tools, express systems, and related products; chemical and radioactive tracer diagnostics services; and well construction products, including AirLock casing buoyancy system, Vecturon and Vectraset liner hanger systems, and Toe initiation sleeves. It offers its products and services primarily to exploration and production companies for use in onshore wells through technically-trained sales force, and operating partners or sales representatives. The company was formerly known as Pioneer Super Holdings, Inc. and changed its name to NCS Multistage Holdings, Inc. in December 2016. NCS Multistage Holdings, Inc. was founded in 2006 and is headquartered in Houston, Texas.