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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.

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.

Stantec Inc. provides professional services in the areas of infrastructure and facilities to the public and private sectors in Canada, the United States, and internationally. It offers evaluation, planning, and designing infrastructure solutions; solutions for sustainable water resources, planning, management, and infrastructure; environmental services; integrated architecture, engineering, interior design, and planning solutions for buildings; and energy and resources solutions. The company also provides consulting services in engineering, architecture, interior design, landscape architecture, surveying, environmental sciences, project management, and project economics. In addition, it offers planning and design services to clients in residential, logistics, retail, infrastructure, energy, higher education, and urban regeneration sectors; architectural and interior design, and planning services in the science and technology, commercial workplace, higher education, residential, and hospitality markets. Further, the company provides transportation advisory, transport engineering, and technical design; project delivery consultancy services for mining, resources, and industrial infrastructure projects; paleontological and archaeological services for the rail, transportation, water, and power and energy sectors; and environmental and cultural resource compliance services. Additionally, it offers consulting services in sustainable building design, energy infrastructure upgrades, sustainable district heating network, and e-mobility; and planning, design, construction administration, commissioning, maintenance, decommissioning, and remediation services. The company was formerly known as Stanley Technology Group Inc. and changed its name to Stantec Inc. in October 1998. Stantec Inc. was founded in 1954 and is headquartered in Edmonton, Canada.

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.

Worley Limited provides professional project and asset services to energy, chemicals, and resources sectors worldwide. The company offers digital, consulting, engineering and design, construction management, construction and fabrication, supply chain management, project management, and operation and maintenance services, as well as maintenance, modification, and operation services. It serves new energy, power, upstream and midstream, refining and chemicals, and infrastructure markets, as well as mining, minerals, and metals markets. The company was formerly known as WorleyParsons Limited and changed its name to Worley Limited in October 2019. The company was incorporated in 2001 and is headquartered in North Sydney, Australia.