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Diversified Royalty Corp., a multi-royalty corporation, engages in the acquisition of royalties from multi-location businesses and franchisors in North America. It owns the Sutton, Mr. Lube + Tires, AIR MILES, Mr. Mikes, Nurse Next Door, Oxford Learning Centres, Stratus Building Solutions, and BarBurrito trademarks. The company was formerly known as BENEV Capital Inc. and changed its name to Diversified Royalty Corp. in September 2014. Diversified Royalty Corp. was founded in 1960 and is headquartered in Vancouver, Canada.

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.

Heritage-Crystal Clean, Inc, through its subsidiary, Heritage-Crystal Clean, LLC, provides parts cleaning, hazardous and non-hazardous waste, and used oil collection services to small and mid-sized customers in the industrial and vehicle maintenance sectors in North America. It operates through two segments, Environmental Services and Oil Business. The Environmental Services segment offers parts cleaning, containerized waste management, wastewater vacuum, antifreeze recycling, emergency and spill response, and industrial and field services. The Oil Business segment engages in the collection of used oil, the sale of recycled fuel oil, and used oil filter removal and disposal activities, as well as the re-refining of used oil into lubricant base oil and other products. The company also collects and disposes wastewater. As of December 31, 2022, it operated through 105 branches serving approximately 104,000 customer locations. Heritage-Crystal Clean, Inc. was incorporated in 2007 and is headquartered in Hoffman Estates, Illinois.

Newater Technology, Inc. operates as a wastewater purification treatment company in the People's Republic of China. The company focuses on the development, manufacture, and sale of disk tube reverse osmosis and disk tube nano-filtration membrane filtration products that are used in the treatment, recycling, and discharge of wastewater. It also supplies hardware and engineered systems for integrated solutions; and offers engineering support and installation, technical advice and service, and other project-related solutions to turn wastewater into clean water. In addition, the company provides landfill leachate treatment and purification services; and traditional wastewater treatment solutions, such as activated carbon and resins. It primarily serves energy, garbage and waste, and chemical industries. Newater Technology, Inc. was founded in 2012 and is headquartered in Yantai, the People's Republic of China.

Perma-Fix Environmental Services, Inc., through its subsidiaries, operates as an environmental and technology know-how company in the United States. The company through Treatment and Services segments. The Treatment segment offers nuclear, low-level radioactive, mixed waste, hazardous and non-hazardous waste treatment, and processing and disposal services through treatment and storage facilities. This segment is also involved in the research and development activities to identify, develop, and implement waste processing techniques for problematic waste streams. The Services segment provides technical services, including professional radiological measurement and site survey of government and commercial installations; health physics services; integrated occupational safety and health services; and consulting, engineering, project and waste management, environmental, decontamination and decommissioning (D&D) field, technical and management personnel and services; and waste management services. This segment also offers nuclear services, including D&D of government and commercial facilities, including engineering, technology applications, specialty services, logistics, transportation, processing, and disposal; and license termination support, such as project management, planning, characterization, waste stream identification and delineation, remediation/demolition, compliance demonstration, final status survey, reporting, transportation, disposal and emergency response. In addition, it maintains, services, maintains, calibrates, and sources health physics, IH and customized nuclear, environmental, and occupational safety and health instruments. The company provides its services to research institutions, commercial companies, public utilities, and governmental agencies through direct sales to customers or through intermediaries. Perma-Fix Environmental Services, Inc. was incorporated in 1990 and is headquartered in Atlanta, Georgia.