EMCOR Group, Inc. provides construction and facilities, building, and industrial services in the United States and the United Kingdom. It offers design, integration, installation, start-up, operation, and maintenance services related to power transmission, distribution, and generation systems; energy solutions; premises electrical and lighting systems; process instrumentation; low-voltage systems; voice and data communications systems; roadway and transit lighting, signaling, and fiber optic lines; computerized traffic control systems, and signal and communication equipment; heating, ventilation, air conditioning, refrigeration, and geothermal solutions; clean-room process ventilation systems; fire protection and suppression systems; plumbing, process, and high-purity piping systems; controls and filtration systems; water and wastewater treatment systems; central plant heating and cooling systems; crane and rigging services; millwright services; and steel fabrication, erection, and welding services. The company also provides building services that covers commercial and government site-based operations and maintenance; facility management, maintenance, and services; energy efficiency retrofit services; military base operations support services; services for indoor air quality; floor care and janitorial services; landscaping, lot sweeping, and snow removal services; vendor management and call center services; installation and support for building systems; program development, management, and maintenance for energy systems; technical consulting and diagnostic services; infrastructure and building projects; modification and retrofit projects; and other building services, including reception, security, and catering services. In addition, it offers refinery turnaround planning and engineering; welding; overhaul and maintenance; instrumentation and electrical; and renewable energy services. The company was incorporated in 1987 and is headquartered in Norwalk, Connecticut.

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.

Bentley Systems, Incorporated, together with its subsidiaries, provides infrastructure engineering software solutions in the Americas, Europe, the Middle East, Africa, and the Asia-Pacific. The company offers open modeling engineering applications, such as MicroStation, OpenBridge, OpenBuildings, OpenCities, OpenComms, OpenFlows, OpenPlant, OpenRail, OpenRoads, OpenSite, OpenTower, OpenTunnel, OpenUtilities, and OpenWindowPower; and open simulation engineering applications, including ADINA, AutoPIPE, CUBE, DYNAMEQ, EMME, LEGION, Power Line Systems, RAM, SACS, SPIDA, and STAAD; and geoprofessional applications for modeling and simulation of near and deep subsurface conditions, including AGS, Central, GeoStudio, Imago, Leapfrog, MX Deposit, Oasis montaj, OpenGround, and PLAXIS. It also provides infrastructure cloud applications, such as ProjectWise, SYNCHRO, and AssetWise, as well as iTwin platform that enables users to create and curate cloud native 4D/5D digital representations of physical infrastructure assets consisting of iTwin Capture, iTwin Experience, and iTwin IoT platforms. The company serves civil, structural, geotechnical, subsurface, process engineers, architects, geospatial professionals, city and regional planners, contractors, fabricators, and operations and maintenance engineers. Bentley Systems, Incorporated was incorporated in 1984 and is headquartered in Exton, Pennsylvania.

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.

NV5 Global, Inc. provides technology, conformity assessment, consulting solutions, and software applications to public and private sector clients in the infrastructure, utility services, construction, real estate, environmental, and geospatial markets in the United States and internationally. It operates through three segments: Infrastructure; Building, Technology & Sciences; and Geospatial Solutions. The company offers site selection and planning, design, water resources, structural engineering, land development, surveying, power delivery, building code compliance, and other services. It is also involved in the construction of highways, bridges and tunnels; development of rail and light rail systems; provision of services related to street and roadway construction; and construction materials testing and engineering, geotechnical engineering and consulting, and forensic consulting services. In addition, the company provides governmental outsourcing and consulting, and technical outsourcing services; and geospatial data analytic and mapping services, as well as remote sensing services. Further, it offers mechanical, electrical, and plumbing design; commissioning; energy performance, management, and optimization; climate change and reducing CO2 emissions; building program management; acoustical design consulting; and audiovisual–security and surveillance–information technology–data center services. Additionally, the company provides various services, such as investigating and analyzing environmental conditions, and recommending corrective measures and procedures; occupational health and safety services; radiation exposure and protection, and nuclear safety and industrial hygiene analyses services; hydrogeological modeling and environmental programs. The company was formerly known as NV5 Holdings, Inc. and changed its name to NV5 Global, Inc. in December 2015. NV5 Global, Inc. was founded in 1949 and is headquartered in Hollywood, Florida.

Willdan Group, Inc., together with its subsidiaries, provides professional, technical, and consulting services primarily in the United States. It operates in two segments, Energy, and Engineering and Consulting. The Energy segment offers comprehensive audit and surveys, program design and implementation, master planning, demand reduction, grid optimization, benchmarking analyses, design engineering, construction management, performance contracting, installation, alternative financing, measurement and verification services, and software and data analytics, as well as energy consulting and engineering, turnkey facility and infrastructure projects, and customer support services. The Engineering and Consulting segment provides building and safety, city engineering and code enforcement, development plan review and inspection, disaster recovery, geotechnical and earthquake engineering, planning and surveying, contract staff support, program and construction management, structural engineering, transportation and traffic engineering, and water resources services. This segment also offers district administration, financial consulting, and federal compliance services. It serves public and governmental agencies, including cities, counties, redevelopment agencies, water districts, school districts, and universities; investor and municipal owned energy utilities; state and federal agencies; and commercial and industrial firms, as well as various other special districts and agencies. The company was founded in 1964 and is headquartered in Anaheim, California.

Montrose Environmental Group, Inc. operates as an environmental services company in the United States, Canada, and internationally. The company operates in three segments: Assessment, Permitting and Response; Measurement and Analysis; and Remediation and Reuse. The Assessment, Permitting and Response segment provides scientific advisory and consulting services to support environmental assessments; environmental emergency response and recovery; toxicology consulting and environmental audits and permits for current operations; facility upgrades; new projects; decommissioning projects; and development projects. This segment also offers technical advisory and consulting services, including regulatory compliance support and planning, environmental, ecosystem and toxicological assessments, and support during responses to environmental disruptions. The Measurement and Analysis segment tests and analyzes air, water, and soil to determine concentrations of contaminants, as well as the toxicological impact of contaminants on flora, fauna, and human health. Its services include source and ambient air testing and monitoring, leak detection, and advanced analytical laboratory services, such as storm water, wastewater, and drinking water analysis. The Remediation and Reuse segment provides engineering, design, implementation, and operations and maintenance services primarily to treat contaminated water, remove contaminants from soil, or create biogas from waste. The company serves financial, oil and gas, utilities, construction, automotive, real-estate, midstream energy, manufacturing, commodities, petrochemical, food and beverage, telecommunications, and engineering industries, as well as local, state, provincial, and federal government entities. Montrose Environmental Group, Inc. was founded in 2012 and is headquartered in North Little Rock, Arkansas.