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Carbon Energy Corporation, an independent oil and natural gas company, engages in the acquisition, exploration, development, and production of oil, natural gas, and natural gas liquids properties in the United States. It focuses on conventional and unconventional reservoirs, including shale, tight sand, and coalbed methane located in the Appalachian, Illinois, and Ventura Basins. It owns working interests and royalty interests in wells located in California, Illinois, Indiana, Kentucky, Ohio, Tennessee, Virginia, and West Virginia, as well as had leasehold positions. The company was formerly known as Carbon Natural Gas Company and changed its name to Carbon Energy Corporation in June 2018. Carbon Energy Corporation was founded in 2007 and is based in Denver, Colorado.

CARBO Ceramics Inc., a technology company, provides products and services to the oil and gas, industrial, and environmental markets worldwide. It operates through two segments, Oilfield and Industrial Technologies and Services, and Environmental Technologies and Services. The Oilfield and Industrial Technologies and Services segment manufactures and sells oilfield ceramic technology products, base ceramic proppants, and frac sand proppants to pressure pumping companies, and oil and gas operators for use in the hydraulic fracturing of natural gas and oil wells. It also provides technology to design, build, and optimize the Frac; sells fracture stimulation software under the FracPro brand; and offers fracture design and consulting services to oil and natural gas exploration and production companies under the StrataGen brand name. The Environmental Technologies and Services segment provides spill prevention, containment, and countermeasure systems for the oil and gas industry. CARBO Ceramics Inc. was founded in 1987 and is headquartered in Houston, Texas.

InPlay Oil Corp. engages in the acquisition, exploration, development, and production of petroleum and natural gas properties in Canada. The company produces and sells crude oil, natural gas, and natural gas liquids. It focuses on light oil asset base located in West Central, Alberta. InPlay Oil Corp. is headquartered in Calgary, Canada.

Key Energy Services, Inc. operates as an onshore rig-based well servicing contractor in the United States. It operates through Rig Services, Fishing and Rental Services, Coiled Tubing Services, and Fluid Management Services segments. The Rig Services segment is involved in the completion of newly drilled wells; workover and recompletion of existing oil and natural gas wells; well maintenance activities; and plugging and abandonment of wells at the end of their useful lives, as well as provision of specialty drilling services to oil and natural gas producers. The Fishing and Rental Services segment provides fishing services that involve recovering lost or stuck equipment in the wellbore utilizing fishing tools; and rents drill pipes, tubulars, handling tools, pressure-control equipment, pumps, power swivels, reversing units, and foam air units. The Coiled Tubing Services segment offers services for wellbore clean-outs, nitrogen jet lifts, through-tubing fishing, and formation stimulations; mills temporary isolation plugs that separate frac zones; and other pre- and post-hydraulic fracturing well preparation services. The Fluid Management Services segment offers transportation and well-site storage services for fluids utilized in drilling, completions, workover, and maintenance activities; and disposal services for fluids produced subsequent to well completion. It also operates a fleet of hot oilers used to clear soluble restrictions in a wellbore. The company was formerly known as Key Energy Group, Inc. and changed its name to Key Energy Services, Inc. in December 1998. Key Energy Services, Inc. was founded in 1977 and is based in Houston, Texas.

SouthGobi Resources Ltd., together with its subsidiaries, operates as an integrated coal mining, development, and exploration company in Mongolia and Hong Kong. It primarily explores for coking and thermal coal. The company's flagship project is the Ovoot Tolgoi open pit coal mine located in the Umnugobi Aimag of Mongolia. It also holds interests in Zag Suuj and Soumber Projects. In addition, the company engages in the logistics and trading of coal in Mongolia and China. The company was formerly known as SouthGobi Energy Resources Ltd. and changed its name to SouthGobi Resources Ltd. in May 2010. SouthGobi Resources Ltd. is based in Kowloon, Hong Kong.