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Chaparral Energy, Inc. engages in the acquisition, exploration, development, production, and operation of onshore oil and natural gas properties primarily in Oklahoma, the United States. The company sells crude oil, natural gas, and natural gas liquids primarily to refineries and gas processing plant. The company was founded in 1988 and is headquartered in Oklahoma City, Oklahoma.

Charah Solutions, Inc. provides environmental services to the power generation industry in the United States. The company offers remediation and compliance services, including environmental management of landfills for coal-fired power generation facilities and new and existing ash ponds; and active pond management services, such as closure by removal, cap-in-place, and design and construction of new ponds. Its remediation and compliance services also include landfill development, construction, and management; site evaluation and characterization; preliminary design and cost estimates with life-cycle analysis; hydrogeological assessment; groundwater and containment modeling; permit application and processing for expansions and greenfield sites; design engineering; construction of landfills and cap and cover systems; conversion of impoundments to landfill sites; quality assurance and control, and documentation; engineered fills (off-site); and other related services. In addition, the company recycles recurring and contracted volumes of coal-fired power generation waste byproducts comprising bottom ash, fly ash, and gypsum byproducts for the use in various industrial purposes. Further, it provides coal ash management services; fossil services that include silo management, on-site ash transportation, and capture and disposal of ash byproduct from coal power operations; and manages combustion byproducts comprising bottom ash, as well as disposal of flue gas desulfurization gypsum, Pozatec/fixated scrubber sludge, and fluidized bed combustion fly ash; and environmental risk transfer services that manages the sites' remediation requirements. The company was founded in 1987 and is headquartered in Louisville, Kentucky.

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.

Rosehill Resources Inc., an independent oil and natural gas company, focuses on the acquisition, exploration, development, and production of unconventional oil and associated liquids-rich natural gas reserves in the Permian Basin. As of December 31, 2018, its portfolio included 67 gross operated producing horizontal wells in the Northern Delaware Basin and 4 gross operated producing horizontal wells in the Southern Delaware Basin; and working interests in approximately 6,665 gross acres in the Northern Delaware Basin and 9,219 gross acres in the Southern Delaware Basin, as well as 513 gross operated and 53 non-operated potential horizontal drilling locations in the Northern and Southern Delaware Basin. The company was founded in 2015 and is headquartered in Houston, Texas. Rosehill Resources Inc. is a subsidiary of Tema Oil & Gas Company.

Pacific Coast Oil Trust is a statutory trust. The company owns net profit interests in the underlying properties, which consist of producing and non-producing interests in oil units, wells and lands. Its properties include Santa Maria Basin, Orcutt Conventional, Orcutt Diatomite, Careaga formation, Los Angeles Basin, West Pico, Sawtelle and East Coyote. The company was founded on January 3, 2012 and is headquartered in Austin, TX.