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.

STERIS plc provides infection prevention products and services worldwide. It operates through three segments: Healthcare, Applied Sterilization Technologies (AST), and Life Sciences. The Healthcare segment offers cleaning chemistries and sterility assurance products; automated endoscope reprocessing system and tracking products; endoscopy accessories, washers, sterilizers, and other pieces of capital equipment for the operation of a sterile processing department; and equipment used directly in surgical tables, lights, and connectivity solutions, as well as equipment management services. It also provides capital equipment installation, maintenance, upgradation, repair, and troubleshooting services; preventive maintenance programs and repair services; instrument, devices, and endoscope repair and maintenance services; and custom process improvement consulting and outsourced instrument sterile processing services. The AST segment provides contract sterilization and testing services for medical device and pharmaceutical manufacturers through a network of contract sterilization and laboratory facilities, as well as integrated sterilization equipment and control systems to medical device manufacturers and research institutions. The Life Sciences segment designs, manufactures, and sells consumable products, such as pharmaceutical detergents, cleanroom disinfectants and sterilants, pharmaceutical grade and research sterilizers and washers, sterility assurance and maintenance products, vaporized hydrogen peroxide room decontamination systems and sterilizers, and high purity water and pure steam generators. This segment also offers equipment installation, maintenance, upgradation, repair, and troubleshooting services; and preventive maintenance programs and repair services. It serves its products and services to hospitals, other healthcare providers, and pharmaceutical manufacturers. The company was founded in 1985 and is headquartered in Mentor, Ohio.

Entegris, Inc. develops, manufactures, and supplies microcontamination control products, specialty chemicals, and advanced materials handling solutions in North America, Taiwan, China, South Korea, Japan, Europe, and Southeast Asia. It operates in three segments: Materials Solutions (MS); Microcontamination Control (MC); and Advanced Materials Handling (AMH). The MC segment solutions to purify critical liquid chemistries and process gases used in semiconductor manufacturing processes and other high-technology industries; integrated circuit chemical mechanical polishing solutions, high-performance etch and clean chemistries, gases and materials, and safe and materials delivery systems. The MS segment provides materials-based solutions, such as chemical mechanical planarization slurries, pads, deposition materials, process chemistries and gases, formulated cleans, etchants, and other specialty materials. The Advanced Materials Handling segment develops solutions for customers' yields by protecting critical materials during manufacturing, transportation, and storage, which include monitor, protect, transport and deliver critical liquid chemistries, wafers, and other substrates for semiconductor, life sciences and other high-technology industries. The company's customers include logic and memory semiconductor device manufacturers, semiconductor equipment makers, gas and chemical manufacturing companies, and wafer grower companies; and flat panel display equipment makers, panel manufacturers, and manufacturers of hard disk drive components and devices, as well as their related ecosystems. It serves manufacturers and suppliers in the solar and life science industries, electrical discharge machining customers, glass and glass container manufacturers, aerospace manufacturers, and manufacturers of biomedical implantation devices. Entegris, Inc. was founded in 1966 and is headquartered in Billerica, Massachusetts.

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.

Sotera Health Company engages in the provision of sterilization, lab testing, and advisory services in the United States and internationally. The company operates through three segments: Sterigenics, Nordion, and Nelson Labs. It provides mission-critical end-to-end sterilization services, including gamma and electron beam irradiation, and ethylene oxide processing, as well as designs, installs, and maintains gamma irradiation systems. The company also provides microbiological and analytical chemistry testing, as well as technical assistance, regulatory consulting, and advisory services. It serves medical devices, pharmaceuticals, food safety, agricultural products, cancer treatment, and high-performance materials industries, as well as commercial, advanced, and specialty application industries. The company was formerly known as Sotera Health Topco, Inc. and changed its name to Sotera Health Company in October 2020. Sotera Health Company was incorporated in 2015 and is headquartered in Broadview Heights, Ohio.

Mesa Laboratories, Inc. develops, designs, manufactures, sells, and services life sciences tools and quality control products and services in North America, Europe, the Asia Pacific, and internationally. The Sterilization and Disinfection Control segment offers biological, chemical, and cleaning indicators, used to assess the effectiveness of sterilization decontamination, disinfection, and cleaning processes in the pharmaceutical, medical device, and healthcare industries. This segment also provides testing and laboratory services to the dental and pharmaceutical industries. The Clinical Genomics segment offers MassARRAY, a genetic analysis tool system, and related consumables, including chips, panels, and chemical reagent solutions used by clinical labs to analyze DNA samples for inherited genetic disease testing, pharmacogenetics, oncology testing, infectious disease testing, doping and toxicology testing, and other differentiated applications for use in research. The Biopharmaceutical Development segment provides automated systems, such as Gyrolab xPand and Gyrolab xPlore hardware and software, Gyrolab Bioaffy consumable microfluidic disks, Gyrolab kits and Rexxip buffers for protein analysis; PurePep Chorus and Symphony instruments for peptide synthesis; and PurePep EasyClean products for purifying peptides. The Calibration Solutions segment offers quality control products to measure and calibrate critical parameters in applications, such as environmental and process monitoring, dialysis, gas flow, air quality, and torque testing in medical device and pharmaceutical manufacturing, laboratory, and hospital environments. This segment's products include continuous monitoring systems, dialysate meters and consumables, data loggers, gas flow calibration and air sampling equipment, and torque testing systems, offered under DialyGuard, ViewPoint, DataTrace, DryCal, and BGI brands. The company was incorporated in 1982 and is headquartered in Lakewood, Colorado.

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.

OpGen, Inc., a precision medicine company, develops and commercializes molecular microbiology solutions for life threatening infectious diseases in the United States and internationally. The company's products include Unyvero application cartridges, Unyvero systems, Acuitas AMR Gene Panel test products, and SARS CoV-2 test kits. It provides laboratory services; collaboration services, including funded software arrangements; and license arrangements services. OpGen, Inc. was incorporated in 2001 and is headquartered in Rockville, Maryland.