Waste Management, Inc., through its subsidiaries, provides waste management environmental services to residential, commercial, industrial, and municipal customers in North America. It offers collection services, including picking up and transporting waste and recyclable materials from where it was generated to a transfer station, material recovery facility (MRF), or disposal site; and owns, develops, and operates landfill gas-to-energy facilities in the United States, as well as owns and operates transfer stations. As of December 31, 2021, the company owned or operated 255 solid waste landfills; 5 secure hazardous waste landfills; 96 MRFs; and 340 transfer stations. It also provides materials processing and commodities recycling services; recycling brokerage services, such as managing the marketing of recyclable materials for third parties; and other strategic business solutions. In addition, the company offers construction and remediation services; services related with the disposal of fly ash, and residue generated from the combustion of coal and other fuel stocks; in-plant services comprising full-service waste management solutions and consulting services; and specialized disposal services for oil and gas exploration and production operations. The company was formerly known as USA Waste Services, Inc. and changed its name to Waste Management, Inc. in 1998. Waste Management, Inc. was incorporated in 1987 and is headquartered in Houston, Texas.

Republic Services, Inc., together with its subsidiaries, offers environmental services in the United States. The company offers collection and processing of recyclable materials, collection, transfer and disposal of non-hazardous solid waste, and other environmental solutions. Its collection services include curbside collection of material for transport to transfer stations, landfills, or recycling processing centers; supply of recycling and waste containers; and renting of compactors. In addition, the company engages in the processing and sale of old corrugated containers, old newsprint, aluminum, glass, and other materials; and provision of landfill and transfer services. Further, it offers disposal of non-hazardous solid and liquid material and in-plant services, such as transportation and logistics. It serves small-container, large-container, and residential customers. As of December 31, 2021, the company operated through 356 collection operations, 239 transfer stations, 198 active landfills, 71 recycling processing centers, 6 saltwater disposal wells, and 7 deep injection wells, as well as 3 treatment, recovery, and disposal facilities in 41 states. It also operated 77 landfill gas-to-energy and renewable energy projects and had 124 closed landfills. The company was incorporated in 1996 and is based in Phoenix, Arizona.

Waste Connections, Inc. provides non-hazardous waste collection, transfer, disposal, and resource recovery services in the United States and Canada. It offers collection services to residential, commercial, municipal, industrial, and exploration and production (E&P) customers; landfill disposal services; and recycling services for various recyclable materials, including compost, cardboard, mixed paper, plastic containers, glass bottles, and ferrous and aluminum metals. The company also owns and operates transfer stations that receive compact and/or load waste to be transported to landfills or treatment facilities through truck, rail, or barge; and intermodal services for the rail haul movement of cargo and solid waste containers in the Pacific Northwest through a network of intermodal facilities. In addition, it provides E&P waste treatment, recovery, and disposal services for waste resulting from oil and natural gas exploration and production activity, such as drilling fluids, drill cuttings, completion fluids, and flowback water; production wastes and produced water during a well's operating life; contaminated soils that require treatment during site reclamation; and substances, which require clean-up after a spill, reserve pit clean-up, or pipeline rupture. Further, the company offers leasing services to its customers. As of December 31, 2021, it owned 334 solid waste collection operations; 142 transfer stations; 61 municipal solid waste (MSW) landfills; 12 E&P waste landfills; 14 non-MSW landfills; 71 recycling operations; 4 intermodal operations; 23 E&P liquid waste injection wells; and 19 E&P waste treatment and oil recovery facilities. The company also operates an additional 53 transfer stations, 10 MSW landfills, and 2 intermodal operations. Waste Connections, Inc. was founded in 1997 and is based in Woodbridge, Canada.

Waste Connections, Inc. provides non-hazardous waste collection, transfer, disposal, and resource recovery services in the United States and Canada. It offers collection services to residential, commercial, municipal, industrial, and exploration and production (E&P) customers; landfill disposal services; and recycling services for various recyclable materials, including compost, cardboard, mixed paper, plastic containers, glass bottles, and ferrous and aluminum metals. The company also owns and operates transfer stations that receive compact and/or load waste to be transported to landfills or treatment facilities through truck, rail, or barge; and intermodal services for the rail haul movement of cargo and solid waste containers in the Pacific Northwest through a network of intermodal facilities. In addition, it provides E&P waste treatment, recovery, and disposal services for waste resulting from oil and natural gas exploration and production activity, such as drilling fluids, drill cuttings, completion fluids, and flowback water; production wastes and produced water during a well's operating life; contaminated soils that require treatment during site reclamation; and substances, which require clean-up after a spill, reserve pit clean-up, or pipeline rupture. Further, the company offers leasing services to its customers. As of December 31, 2021, it owned 334 solid waste collection operations; 142 transfer stations; 61 municipal solid waste (MSW) landfills; 12 E&P waste landfills; 14 non-MSW landfills; 71 recycling operations; 4 intermodal operations; 23 E&P liquid waste injection wells; and 19 E&P waste treatment and oil recovery facilities. The company also operates an additional 53 transfer stations, 10 MSW landfills, and 2 intermodal operations. Waste Connections, Inc. was founded in 1997 and is based in Woodbridge, Canada.

GFL Environmental Inc. operates as a diversified environmental services company in Canada and the United States. The company offers non-hazardous solid waste management, infrastructure and soil remediation, and liquid waste management services. Its solid waste management business line includes the collection, transportation, transfer, recycling, and disposal of non-hazardous solid waste for municipal, residential, and commercial and industrial customers. The company's infrastructure and soil remediation business line provides remediation of contaminated soils, as well as complementary services, including civil, demolition, and excavation and shoring services. Its liquid waste management business collects, manages, transports, processes, and disposes of a range of industrial and commercial liquid wastes, as well as resells liquid waste products. The company was incorporated in 2007 and is headquartered in Vaughan, Canada.

Veolia Environnement S.A. designs and provides water, waste, and energy management solutions worldwide. The company is involved in the resource management, production, and delivery of drinking water and industrial process water; collection, treatment, and recycling of wastewater; and design and construction of treatment and network infrastructure. It also provides waste collection, waste material recovery, waste-to-energy, organic waste material recovery, hazardous waste treatment, dismantling and remediation, urban cleaning, and industrial maintenance and cleaning services. In addition, the company engages in the operation and maintenance of heating and cooling networks; development of energy services to reduce the energy consumption and CO2 emissions of buildings; optimization of industrial utilities; and energy use related to processes and industrial buildings, as well as produces electricity from biomass. It offers drinking water to 95 million people. The company was formerly known as Vivendi Environnement and changed its name to Veolia Environnement S.A. in 2003. Veolia Environnement S.A. was founded in 1853 and is based in Aubervilliers, France.

GFL Environmental Inc. operates as a diversified environmental services company in Canada and the United States. The company offers non-hazardous solid waste management, infrastructure and soil remediation, and liquid waste management services. Its solid waste management business line includes the collection, transportation, transfer, recycling, and disposal of non-hazardous solid waste for municipal, residential, and commercial and industrial customers. The company's infrastructure and soil remediation business line provides remediation of contaminated soils, as well as complementary services, including civil, demolition, and excavation and shoring services. Its liquid waste management business collects, manages, transports, processes, and disposes of a range of industrial and commercial liquid wastes, as well as resells liquid waste products. The company was incorporated in 2007 and is headquartered in Vaughan, Canada.

Clean Harbors, Inc. provides environmental and industrial services in North America. 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 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 offers specially designed parts washers; automotive and industrial cleaning products, such as antifreeze, windshield washer fluid, degreasers, glass and floor cleaners, hand cleaners, absorbents, mats, and spill kits; pickup and transportation services for hazardous and non-hazardous containerized waste for recycling or disposal; 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 remove and collect waste fluids found at metal fabricators, auto maintenance providers, and general manufacturers. This segment also manufactures, formulates, packages, distributes, and markets lubricants; and provides containerized waste, vacuum services, used motor oil collection, and contract blending and packaging services. 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 northeastern 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 a range of non-hazardous solid waste services, including collections, transfer stations, and disposal facilities. It also markets recyclable metals, aluminum, plastics, and paper and corrugated cardboard that are processed at its facilities, as well as recyclables purchased from third parties. In addition, the company is involved in commodity brokerage operations. As of January 31, 2022, it owned and/or operated 50 solid waste collection operations, 65 transfer stations, 23 recycling facilities, 8 Subtitle D landfills, 3 landfill gas-to-energy facilities, and 1 landfill permitted to accept construction and demolition materials. Casella Waste Systems, Inc. was founded in 1975 and is headquartered in Rutland, Vermont.

Secure Energy Services Inc., an energy services company, provides solutions to upstream oil and natural gas companies operating primarily in Western Canadian Sedimentary Basin and the United States. It operates through two segments, Midstream Infrastructure, and Environmental and Fluid Management. The company's Midstream Infrastructure segment provides services, such as clean oil terminalling, rail transloading, pipeline transportation, marketing and custom treating of crude oil, produced and waste water disposal, oilfield waste processing, and purchase/resale of oil services through its full service terminals, rail facilities, crude oil pipelines, crude oil terminalling facilities, water disposal facilities, and landfills. The Environmental and Fluid Management segment includes a network of owned, operated, and marketed industrial landfills, hazardous and non-hazardous waste management and disposal, onsite abandonment, and environmental solutions for site remediation and reclamation, bio-remediation, water treatment and recycling, emergency response, rail, and metal recycling services, as well as offers fluid management for drilling, completion, and production operations for oil and gas producers. This segment also designs and implements drilling fluid systems for producers drilling for oil, bitumen, and natural gas; provides naturally occurring radioactive material management services, as well as equipment and chemical solutions that optimize well production. Secure Energy Services Inc. is headquartered in Calgary, Canada.

Derichebourg SA provides environmental services to businesses, and local and municipal authorities worldwide. The company's Environmental Services division engages in collection, sorting, recycling, and recovering of ferrous and non-ferrous metals from end-of-life consumer goods, including automobiles, electrical and electronic waste, etc.; recuperation materials, such as industrial demolitions; and new scrap from transformation processes, which include production waste. The division also offers waste collection and urban cleaning services; manages waste collection center and consumer; collects and treats wastewater; produces and distributes drinking water; and treats xenobiotics. Its Multiservices division provides outsourcing services for industrial and service sector companies, as well as for public services and local authorities. This division offers industrial cleaning and maintenance, and handling/logistics services; electrical and air conditioning engineering, and multi-technical maintenance; facility management services; remote surveillance; reception desk and corporate event planning, retail and event reception, and mail services; public and traffic lightings; urban billboards, and maintenance services for urban furnishings; green spaces, and roads and utility services; general and specialized temporary staffing services; temporary aeronautics and wind farm staffing services; aeronautics recruitment services; and training center services. Derichebourg SA was founded in 1956 and is headquartered in Paris, France.

Enviri Corporation provides environmental solutions for industrial and specialty waste streams in the United States and internationally. The company operates through two segments: Harsco Environmental and Harsco Clean Earth. The Harsco Environmental segment offers on-site services under long-term contracts for material logistics, product quality improvement, and resource recovery for iron, steel, and metals manufacturing; manufactures and sells industrial abrasives, roofing granules, aluminum dross, and scrap processing systems; and produces value-added downstream products from industrial waste-stream. The Harsco Clean Earth segment provides specialty waste processing, treatment, and recycling and beneficial reuse solutions for waste needs, such as hazardous, non-hazardous, and contaminated soils and dredged materials. The company was formerly known as Harsco Corporation and changed its name to Enviri Corporation in June 2023. The company was founded in 1853 and is headquartered in Philadelphia, Pennsylvania.

Montrose Environmental Group, Inc. operates as an environmental services company in the United States. The company operates in three segments: Assessment, Permitting and Response; Measurement and Analysis; and Remediation and Reuse. The Assessment, Permitting and Response segment provides scientific advisory and consulting services to support environmental assessments, environmental emergency response and recovery, toxicology consulting and environmental audits and permits for current operations, facility upgrades, new projects, decommissioning projects, and development projects. Its technical advisory and consulting services include regulatory compliance support and planning, environmental, and ecosystem and toxicological assessments and support during responses to environmental disruptions. The Measurement and Analysis segment tests and analyzes air, water, and soil to determine concentrations of contaminants, as well as the toxicological impact of contaminants on flora, fauna, and human health. Its services include source and ambient air testing and monitoring, leak detection, and advanced analytical laboratory services, such as air, storm water, wastewater, and drinking water analysis. The Remediation and Reuse segment provides engineering, design, implementation, and operations and maintenance services primarily to treat contaminated water, remove contaminants from soil, or create biogas from waste. It serves technology, media, chemical, energy, power and utility, industrial and manufacturing, financial, and engineering industries, as well as local, state, provincial, and federal government entities. The company was founded in 2012 and is headquartered in North Little Rock, Arkansas.

Perma-Fix Environmental Services, Inc., through its subsidiaries, operates as an environmental and technology know-how company in the United States. It operates in three segments: Treatment, Services, and Medical. 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; integrated occupational safety and health services; and consulting, engineering, project and waste management, environmental, decontamination and decommissioning (D&D) field, technical, on-site waste management services, and management personnel and services. This segment also offers nuclear services, including technology-based services comprising engineering, D&D, specialty, construction, logistics, transportation, processing, and disposal; offers remediation of nuclear licensed and federal facilities, as well as cleanup of nuclear legacy sites; and owns an equipment calibration and maintenance laboratory that services, maintains, calibrates, and sources health physics, industrial hygiene, and customized nuclear, environmental, and occupational safety and health instrumentation. The Medical segment is involved in the research and development of medical isotope production technology. 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 based in Atlanta, Georgia.

LanzaTech Global, Inc. operates as a nature-based carbon refining company in the United States and internationally. The company transforms waste carbon into the chemical building blocks for consumer goods, such as sustainable fuels, fabrics, and packaging. LanzaTech Global, Inc. was founded in 2005 and is headquartered in Skokie, Illinois.

Quest Resource Holding Corporation, together with its subsidiaries, provides solutions for the reuse, recycling, and disposal of various waste streams and recyclables in the United States. It offers disposal and recycling services for motor oil and automotive lubricants, oil filters, scrap tires, oily water, goods destruction, food waste, meat renderings, cooking oil and grease trap waste, plastics, cardboard, metal, glass, mixed paper, construction debris, as well as a large variety of regulated and non-regulated solid, liquid, and gas wastes. The company provides santifreeze and windshield washer fluid, dumpster and compacting equipment, and other minor ancillary services. In addition, it offers landfill diversion services. The company's services focus on the waste streams and recyclables from big box, grocers, and other retailers; automotive maintenance, quick lube, dealerships, and collision repair; transportation, logistics, and internal fleet operators; manufacturing plants; multi-family and commercial properties; restaurant chains and food operations; and construction and demolition projects. It markets its services to automotive, manufacturing, hospitality and retail, construction and demolition, and commercial and multi-family property management industries through direct sales force and strategic partnerships. The company was formerly known as Infinity Resources Holdings Corp. and changed its name to Quest Resource Holding Corporation in October 2013. Quest Resource Holding Corporation was incorporated in 2002 and is based in The Colony, Texas.

Decent Holding Inc., through its subsidiaries, provides industrial wastewater treatment services in the People's Republic of China. It also provides ecological river restoration and river ecosystem management services. In addition, the company offers microbial products, including COD decreasing, algae removal, and ammonia nitrogen decreasing bacteria, as well as river conditioner that are used to enhance water quality, remove pollutants, and treat black odor water. The company was founded in 2011 and is based in Yantai, the People's Republic of China. Decent Holding Inc. is a subsidiary of Decent Limited.

Greenwave Technology Solutions, Inc., through its subsidiary, Empire Services, Inc., operates metal recycling facilities in Virginia and North Carolina. The company, through its 11 metal recycling facilities, collects, classifies, and processes raw scrap ferrous and nonferrous metals for recycling iron, steel, aluminum, copper, lead, stainless steel, and zinc. It is involved in the purchasing and selling processed and unprocessed scrap metals to steel mills and other purchasers. The company was formerly known as MassRoots, Inc and changed its name to Greenwave Technology Solutions, Inc. in October 2021. The company was founded in 2002 and is headquartered in Suffolk, Virginia.

Europlasma S.A., together with its subsidiaries, engages in developing, constructing, and operating of the plasma torch system for industrial applications in France. It offers plasma solutions for gas and hazardous wastes. The company also engages in the production of renewable energy from waste and biomass; and provides asbestos waste treatment services, such as collection, transport, neutralization, and recovery services for hazardous waste. Europlasma S.A. was founded in 1992 and is based in Pessac, France.