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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.

Casella Waste Systems, Inc., together with its subsidiaries, operates as a vertically integrated solid waste services company in the United States. It offers resource management services primarily in the areas of solid waste collection and disposal, transfer, recycling, and organics services to residential, commercial, municipal, institutional, and industrial customers. The company provides non-hazardous solid waste services, including collections, transfer stations, recycling, and disposal operations. In addition, it markets materials, including fibers, corrugated cardboard, newsprint, plastics, glass, ferrous, and aluminum metals. Casella Waste Systems, Inc. was founded in 1975 and is headquartered in Rutland, Vermont.

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.

Tetra Tech, Inc. provides consulting and engineering services in the United States and internationally. The company operates through two segments, Government Services Group (GSG) and Commercial/International Services Group (CIG). The GSG segment offers early data collection and monitoring, data analysis and information management, science and engineering applied research, engineering design, project management, and operations and maintenance services; and climate change and energy management consulting, as well as greenhouse gas inventory assessment, certification, reduction, and management services. This segment serves federal, state, and local governments; and development agencies in water resources analysis and water management, environmental monitoring, data analytics, government consulting, waste management, and a range of civil infrastructure master planning and engineering design markets. The CIG segment provides early data collection and monitoring, data analysis and information management, feasibility studies and assessments, science and engineering applied research, engineering design, project management, and operations and maintenance services; and environmental remediation and reconstruction services, and industrial water treatment services. This segment serves natural resources, energy, and utilities markets, as well as sustainable infrastructure master planning and engineering design for facilities, transportation, and local development projects. Tetra Tech, Inc. was founded in 1966 and is headquartered in Pasadena, California.