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Clean Harbors, Inc. provides environmental and industrial services in the United States and internationally. The company operates through two segments, Environmental Services and Safety-Kleen Sustainability Solutions. The Environmental Services segment collects, transports, treats, and disposes hazardous and non-hazardous waste, such as resource recovery, physical treatment, fuel blending, incineration, landfill disposal, wastewater treatment, lab chemicals disposal, and explosives management services; and offers CleanPack services, including collection, identification, categorization, specialized packaging, transportation, and disposal of laboratory chemicals and household hazardous waste. This segment also provides industrial maintenance and specialty industrial services; and utilizes specialty equipment and resources that performs field services. The Safety-Kleen Sustainability Solutions segment provides pickup and transportation services for hazardous and non-hazardous containerized waste for recycling or disposal; machine cleaning and maintenance, and disposal and replenishment of clean solvent or aqueous fluids; and vacuum services to remove solids, residual oily water, and sludge and other fluids from customers' oil/water separators, sumps, and collection tanks, as well as removes and collects waste fluids found at large and small industrial locations, including metal fabricators, auto maintenance providers, and general manufacturers. This segment also manufactures, formulates, packages, distributes, and markets lubricants and other automotive products. Clean Harbors, Inc. was incorporated in 1980 and is headquartered in Norwell, Massachusetts.

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.

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.

Sharps Compliance Corp. provides medical, pharmaceutical, and hazardous waste management services in the United States. It offers Sharps Recovery System for the containment, transportation, treatment, and tracking of medical waste generated outside the hospital and health care facility settings; TakeAway Recovery System to treat used needles, syringes, and other used healthcare products; Route-Based Pickup Service, a medical and hazardous waste pick-up services; and MedSafe, a solution for the safe collection, transportation, and disposal of unwanted and expired ultimate-user medications. The company also provides TakeAway Medication Recovery System that facilitates the proper disposal of unused medications; Black Pail Program for Rx, a solution with minimal segregation for the disposal of various pharmaceuticals; Inhaler Disposal to collect, transport, and destroy used pharmaceutical inhalers; Hazardous Drug Spill Control Kit for the cleanup of chemotherapy and other HD spills; TakeAway Recycle System for the collection and recycling of single-use medical devices from surgical centers and other healthcare facilities; ComplianceTRAC, a Web-based compliance and training program; and Universal Waste Shipback Systems to collect, transport, and recycle light bulbs, batteries, and other mercury containing devices. In addition, it offers other solutions, such as TakeAway Environmental Return System, SharpsTracer, Sharps Secure, Needle Disposal System, Complete Needle Collection and Disposal System, Pitch-It IV Poles, Asset Return System, and Spill Kit Recovery System, as well as Sharps MWMS, a medical waste management system. The company serves customers in home health care, retail clinics and immunizing pharmacies, pharmaceutical manufacturers, professional offices, assisted living and long-term care facilities, and government agencies, as well as distributors. Sharps Compliance Corp. was founded in 1992 and is headquartered in Houston, Texas.

Stericycle, Inc., together with its subsidiaries, provides regulated waste and compliance services in the United States, Europe, and internationally. The company offers regulated waste and compliance services, including regulated medical waste, sharps waste management and disposal, pharmaceutical waste management and disposal, chemotherapy waste and disposal, controlled substance waste disposal, healthcare hazardous waste, and integrated waste stream solutions; specialty services, such as MedDrop medication collection kiosks, safe community solutions, SafeDrop sharps mailback solutions, and airport and maritime waste services; medical supply store services, that includes sharps and disposable biohazardous waste containers, infection control supplies, and seal&send medication mail back; and compliance solutions including Steri-Safe compliance solutions. It also provides secure information destruction services, including document, hard drive, destruction services under the Shred-it brand. The company serves healthcare businesses, including hospitals, health systems, non-affiliate hospitals, national and corporate healthcare, physician offices, surgery centers, veterinary and dental clinics, nursing and long-term care facilities, clinics and urgent care, dialysis centers, pharmacy, lab, research centers, home health organizations, etc.; and airports and seaports, education institutions, funeral homes and crematories, government and military, banks and professional services, and other businesses. Stericycle, Inc. was incorporated in 1989 and is headquartered in Bannockburn, Illinois.