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AECOM, together with its subsidiaries, provides professional infrastructure consulting services worldwide. It operates in three segments: Americas, International, and AECOM Capital. The company offers planning, consulting, architectural and engineering design, construction and program management, and investment and development services to public and private clients. It is also involved in the investment and development of real estate projects. In addition, the company provides construction services, including building construction and energy, and infrastructure and industrial construction. It serves transportation, water, government, facilities, environmental, and energy sectors. The company was formerly known as AECOM Technology Corporation and changed its name to AECOM in January 2015. AECOM was incorporated in 1980 and is headquartered in Dallas, Texas.

Armstrong World Industries, Inc., together with its subsidiaries, engages in the design, manufacture, and sale of ceiling and wall solutions in the Americas. It operates through Mineral Fiber and Architectural Specialties segments. The company offers mineral fiber, fiberglass wool, metal, wood, felt, wood fiber, and glass-reinforced-gypsum; ceiling component products, such as ceiling perimeters and trims, as well as grid products that support drywall ceiling systems; ceilings, walls, and facades for use in commercial settings; and manufactures ceiling suspension system (grid) products. It serves commercial and residential construction markets, as well as renovation of existing buildings sectors. The company sells its products to resale distributors, ceiling system contractors, wholesalers, and retailers comprising large home centers. Armstrong World Industries, Inc. was founded in 1860 and is headquartered in Lancaster, Pennsylvania.

Babcock International Group PLC, together with its subsidiaries, provides value-add services for aerospace, defense, and security in the United Kingdom, rest of Europe, Africa, North America, Australasia, and internationally. The company operates through four segments: Marine, Nuclear, Land, and Aviation. It designs, procures, operates, and manages critical utility and process equipment; offers asset management, defense and maritime training, information and intelligence, equipment and system, and facilities and infrastructure services, as well as naval platforms; and designs, manufactures, and provides through-life support for mechanical and electrical systems and equipment. The company also offers naval architecture, engineering, and project management services; submarines and complex engineering services in support of various decommissioning programs and projects, training and operation support, new build program management, and design and installation; critical vehicle fleet management, and equipment support and training services for military and civil customers; and designs, assesses, manufactures, installs, maintains, and decommissions vehicles for police, fire and ambulance, civil service, military, and other security-focused organizations. In addition, it provides plain line track renewal services; and engineering services for track projects, signaling, telecommunications, and on-track plants. Further, the company offers critical engineering services to defense and civil customers, including pilot training, equipment support, and airbase management, as well as operates aviation fleets that provide delivering emergency services. The company was founded in 1891 and is headquartered in London, the United Kingdom.

Owens Corning manufactures and sells building and construction materials in the United States, Europe, the Asia Pacific, and internationally. It operates in three segments: Roofing, Insulation, and Composites. The Roofing segment manufactures and sells laminate and strip asphalt roofing shingles, oxidized asphalt materials, and roofing components used in residential and commercial construction, and specialty applications. This segment sells its products through distributors, home centers, and lumberyards, as well as to roofing contractors for built-up roofing asphalt systems; and manufacturers in automotive, chemical, rubber, and construction industries. The Insulation segment manufactures and sells thermal and acoustical batts, loosefill insulation, spray foam insulation, foam sheathing and accessories under the Owens Corning PINK, and FIBERGLAS brands; and glass fiber pipe insulation, energy efficient flexible duct media, bonded and granulated mineral wool insulation, cellular glass insulation, and foam insulation under the FOAMULAR, FOAMGLAS, and Paroc brand names used in construction applications. This segment sells its products primarily to the insulation installers, home centers, lumberyards, retailers, and distributors. The Composites segment manufactures, fabricates, and sells glass reinforcements in the form of fiber; and glass fiber products in the form of fabrics, non-wovens, and composite lumber. Its products are used in building structures, roofing shingles, tubs and showers, pools, decking, flooring, pipes and tanks, poles, electrical equipment, and wind-energy turbine blades. This segment sells its products directly to parts molders, fabricators, and shingle manufacturers. The company was incorporated in 1938 and is headquartered in Toledo, Ohio.

Quanta Services, Inc. provides infrastructure solutions for the electric and gas utility, renewable energy, communications, and pipeline and energy industries in the United States, Canada, Australia, and internationally. The company's Electric Power Infrastructure Solutions segment engages in the design, procurement, construction, upgrade, repair, and maintenance of electric power transmission and distribution infrastructure and substation facilities; installation, maintenance, and upgrade of electric power infrastructure projects; installation of smart grid technologies on electric power networks; and design, installation, maintenance, and repair of commercial and industrial wirings. This segment also offers aviation services; emergency restoration services; and other engineering and technical services; design and construction solutions to wireline and wireless communications, cable multi-system operators, and other customers; and training for electric workers, as well as training for the gas distribution and communications industries. The company's Renewable Energy Infrastructure Solutions segment is involved in engineering, procurement, construction, repair, and maintenance of wind, solar, and hydropower generation facilities, as well as battery storage facilities; and provision of engineering and construction services for substations and switchyards, transmission, and other electrical infrastructures. The company's Underground Utility and Infrastructure Solutions segment offers design, engineering, procurement, construction, upgrade, repair, and maintenance services for natural gas systems for gas utility customers; fabrication services for pipeline support systems and structures and facilities; and engineering and construction services for pipeline and storage systems, and compressor and pump stations. The company was formerly known as Fabal Construction, Inc. and changed its name to Quanta Services, Inc. in November 1997. The company was incorporated in 1997 and is headquartered in Houston, Texas.