Waste Management, Inc., through its subsidiaries, engages in the provision of environmental solutions to residential, commercial, industrial, and municipal customers in the United States and Canada. 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 and operates transfer stations, as well as owns, develops, and operates landfill facilities that produce landfill gas used as renewable natural gas for generating electricity. As of December 31, 2022, the company owned or operated 254 solid waste landfills, five secure hazardous waste landfills, 97 MRFs, and 337 transfer stations. It also provides materials processing and commodities recycling services at its MRFs, where cardboard, paper, glass, metals, plastics, construction and demolition materials, and other recycling commodities are recovered for resale or redirected for other purposes; 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 and Canada. It is involved in the collection and processing of recyclable, solid waste, and industrial waste materials; transportation and disposal of non-hazardous and hazardous waste streams; and other environmental solutions. Its residential collection services include curbside collection of material for transport to transfer stations, landfills, recycling centers, and organics processing facilities; supply of recycling and waste containers; and renting of compactors. The company also engages in the processing and sale of old corrugated containers, old newsprint, aluminum, glass, and other materials; and provision of landfill services. It serves small-container, large-container, and residential customers. The company was incorporated in 1996 and is based in Phoenix, Arizona.

Ecolab Inc. provides water, hygiene, and infection prevention solutions and services in the United States and internationally. The company operates through three segments: Global Industrial; Global Institutional & Specialty; and Global Healthcare & Life Sciences. The Global Industrial segment offers water treatment and process applications, and cleaning and sanitizing solutions to manufacturing, food and beverage processing, transportation, chemical, metals and mining, power generation, pulp and paper, commercial laundry, petroleum, refining, and petrochemical industries. Its Global Institutional & Specialty segment provides specialized cleaning and sanitizing products to the foodservice, hospitality, lodging, government and education, and retail industries. The Global Healthcare & Life Sciences segment offers specialized cleaning and sanitizing products to the healthcare, personal care, and pharmaceutical industries, such as infection prevention and surgical solutions, and end-to-end cleaning and contamination control solutions under the Ecolab, Microtek, and Anios brand names. In addition, the company provides pest elimination services to detect, eliminate, and prevent pests, such as rodents and insects in restaurants, food and beverage processors, hotels, grocery operations, and other commercial segments including education, life sciences, and healthcare customers. Further, it offers colloidal silica for binding and polishing applications in semiconductor, catalyst, and aerospace component manufacturing, as well as chemical industries; and products and services that manage wash process through custom designed programs, premium products, dispensing equipment, water and energy management, and reduction, as well as real time data management. It sells its products through field sales and corporate account personnel, distributors, and dealers. Ecolab Inc. was founded in 1923 and is headquartered in Saint Paul, Minnesota.

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 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. Waste Connections, Inc. was founded in 1997 and is based in Woodbridge, Canada.

GFL Environmental Inc. offers non-hazardous solid waste management and environmental services in Canada and the United States. It offers solid waste management, liquid waste management, and soil remediation services, including collection, transportation, transfer, recycling, and disposal services for municipal, residential, and commercial, and industrial customers. The company was incorporated in 2007 and is headquartered in Vaughan, Canada.

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. As of November 4, 2024, Stericycle, Inc. operates as a subsidiary of Waste Management, Inc.

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 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 meltshop and furnace services, such as under-vessel cleaning, removal of ladle slag, and general melt shop debris. This segment also produces and sells value-added downstream products from industrial waste-stream, including road surfacing and materials, such as slag-based asphalt product under the SteelPhal brand; abrasives and roofing materials under the BLACK BEAUTY and SURE/CUT brand names; Metallurgical Additives; agriculture and turf products comprising soil conditioners and fertilizers under the CrossOver and AgrowSil brands; and cement additives. The Clean Earth segment provides specialty waste processing, treatment, recycling, and beneficial reuse solutions for waste needs, such as hazardous, non-hazardous, and contaminated soils and dredged materials to industrial, retail, healthcare, and construction industries. 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.

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. The company provides 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. It offers antifreeze and windshield washer fluid, dumpster and compacting equipment, and other minor ancillary services. In addition, the company offers landfill diversion services. Its 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. The company 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 is headquartered in The Colony, Texas.