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AptarGroup, Inc. designs and manufactures a range of drug delivery, consumer product dispensing, and active material science solutions and services for the pharmaceutical, beauty, personal care, home care, and food and beverage markets. The company operates through Aptar Pharma, Aptar Beauty, and Aptar Closures segments. It also provides pumps for nasal allergy treatments; and metered dose inhaler valves for respiratory ailments, such as asthma and chronic obstructive pulmonary diseases; elastomer for injectable primary packaging components; and active material science solutions. In addition, the company offers dispensing pumps, closures, elastomeric components, and aerosol valves to the digital health solutions. It primarily sells its products and services in Asia, Europe, Latin America, and North America. AptarGroup, Inc. was incorporated in 1992 and is headquartered in Crystal Lake, Illinois.

Donaldson Company, Inc. manufactures and sells filtration systems and replacement parts worldwide. The company operates through three segments: Mobile Solutions, Industrial Solutions, and Life Sciences. Its Mobile Solutions segment provides replacement filters for air and liquid filtration applications, such as air filtration systems; liquid filtration systems for fuel, lube, and hydraulic applications; exhaust and emissions systems and sensors; indicators; and monitoring systems. This segment sells its products to original equipment manufacturers (OEMs) in the construction, mining, agriculture, aerospace, defense, and transportation markets; and to independent distributors, and OEM dealer networks. The company's Industrial Solutions segment offers dust, fume, and mist collectors; compressed air and industrial gasses purification systems; and hydraulic and lubricated rotating equipment applications, as well as gas and liquid filtration for industrial processes. This segment sells its products to various distributors, OEMs, and end-users. Its Life Sciences segment provides micro-environment gas and liquid filtration for food, beverage, and industrial processes; bioprocessing equipment, that includes bioreactors and fermenters; and bioprocessing consumables, such as chromatography devices, reagents and filters, and polytetrafluoroethylene membrane-based products, as well as specialized air and gas filtration systems for applications, including hard disk drives, semi-conductor manufacturing and sensors, battery systems, and powertrain components to OEMs and various end-users. The company was founded in 1915 and is headquartered in Bloomington, Minnesota.

The Middleby Corporation designs, markets, manufactures, distributes, and services foodservice, food processing, and residential kitchen equipment worldwide. Its Commercial Foodservice Equipment Group segment offers conveyor, combi, convection, baking, proofing, deck, speed cooking, and hydrovection ovens; ranges, fryers, and rethermalizers; steam cooking, food warming, catering, induction cooking, and countertop cooking equipment; heated cabinets, charbroilers, ventless cooking systems, kitchen ventilation, toasters, griddles, charcoal grills, professional mixers, stainless steel fabrication, custom millwork, professional refrigerators, blast chillers, cold rooms, ice machines, and freezers; soft serve ice cream, coffee and beverage dispensing, home and professional craft brewing equipment; and fry dispensers, bottle filling and canning equipment, IoT solutions, and controls development and manufacturing. The company's Food Processing Equipment Group segment provides batch, baking, proofing, conveyor belt, and continuous processing ovens; frying and automated thermal processing systems; tumblers, massagers, grinders, slicers, reduction and emulsion systems, mixers, and blenders; battering, breading, and seeding equipment; water cutting systems, food presses, food suspension equipment, filling and depositing solutions, and forming equipment; and automated washing systems, auto-guided vehicles, food safety, food handling, freezing, and defrosting and packaging equipment. Its Residential Kitchen Equipment Group segment offers kitchen equipment comprising cookers, stoves, cooktops, microwaves, ovens, refrigerators, dishwashers, undercounter refrigeration, wine cellars, ice machines, beer dispensers, mixers, rotisseries, and ventilation and outdoor cooking equipment. The company was formerly known as Middleby Marshall Oven Company and changed its name to The Middleby Corporation in 1985. The company was founded in 1888 and is based in Elgin, 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.