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.

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.

Sterling Infrastructure, Inc. engages in the provision of e-infrastructure, transportation, and building solutions primarily in the United States. It operates through three segments: E-Infrastructure Solutions, Transportation Solutions, and Building Solutions. The E-Infrastructure Solutions segment provides site development services for the blue-chip end users in the e-commerce distribution center, data center, manufacturing, warehousing, and power generation sectors. The Transportation Solutions segment is involved in the development of infrastructure and rehabilitation projects for highways, roads, bridges, airports, ports, rail, and storm drainage systems for the departments of transportation in various states, regional transit authorities, airport authorities, port authorities, water authorities, and railroads. The Building Solutions segment provides residential and commercial concrete foundations for single-family and multi-family homes, parking structures, elevated slabs, other concrete work for developers and general contractors, as well as provides plumbing services for residential builds. The company was formerly known as Sterling Construction Company, Inc. and changed its name to Sterling Infrastructure, Inc. in June 2022. Sterling Infrastructure, Inc. was founded in 1955 and is headquartered in The Woodlands, Texas.

Granite Construction Incorporated operates as an infrastructure contractor in the United States. It operates through two segments: Construction and Materials segments. The Construction segment engages in the construction and rehabilitation of roads, pavement preservation, bridges, rail lines, airports, marine ports, dams, reservoirs, aqueducts, infrastructure, and site development for use by the public and water-related construction for municipal agencies, commercial water suppliers, industrial facilities, and energy companies; and construction of various complex projects, including infrastructure/site development, mining, public safety, tunnel, solar storage, and power related projects. The Materials segment is involved in the production of aggregates, asphalt concrete, liquid asphalt, and recycled materials production for internal use in our construction projects and sale to third parties. It also offers site preparation, mining, and infrastructure services for residential development, energy development, commercial and industrial sites, railways, residential development, and energy development; and provides construction management professional services. It serves federal agencies, state departments of transportation, local transit authorities, county and city public works departments, school districts and developers, utilities, contractors, landscapers, manufacturers of products requiring aggregate materials, retailers, homeowners, farmers, brokers, and private owners of industrial, commercial, and residential sites. Granite Construction Incorporated was incorporated in 1922 and is headquartered in Watsonville, California.

Primoris Services Corporation, a specialty contractor company, provides a range of specialty construction, fabrication, maintenance, replacement, and engineering services in the United States and Canada. The company operates through Utilities and Energy/Renewables segments. The Utilities segment offers installation and maintenance services for new and existing natural gas distribution systems, electric utility distribution and transmission systems, and communications systems. The Energy/Renewables segment provides a range of services, including engineering, procurement, and construction, as well as retrofits, highway and bridge construction, demolition, site work, soil stabilization, excavation, flood control, upgrades, repairs, outages, and maintenance services to renewable energy and energy storage, renewable fuels, petroleum, and petrochemical industries, as well as state departments of transportation. It also offers pipeline construction and maintenance, and storage services; pipeline facility, and integrity services. Primoris Services Corporation was founded in 1960 and is headquartered in Dallas, Texas.

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.

Orion Group Holdings, Inc. operates as a specialty construction company in the building, industrial, and infrastructure sectors in the United States, Alaska, Hawaii, Canada, and the Caribbean Basin. It operates in two segments, Marine and Concrete. The company provides marine construction services, including construction, restoration, dredging, maintenance, and repair of marine transportation facilities and pipelines, bridges and causeways, and marine environmental structures. Its marine transportation facility projects comprise cruise ship port facilities, private terminals, special-use navy terminals, recreational use marinas and docks, and other marine-based facilities, as well as building or rehabilitating public port facilities for container ship loading and unloading. The company also offers on-going maintenance and repair, inspection, emergency repair, and demolition and salvage services. Its marine pipeline service projects include the installation and removal of underwater buried pipeline transmission lines; the installation of pipeline intakes and outfalls for industrial facilities; the construction of pipeline outfalls for wastewater and industrial discharges; river crossing and directional drilling; the creation of hot taps and tie-ins; and inspection, maintenance, and repair services. The company's bridge and causeway projects include the construction, repair, and maintenance of overwater bridges and causeways, as well as the develops fendering systems in marine environments. The company also provides specialty services, such as design, salvage, demolition, surveying, towing, diving and underwater inspection, excavation, and repair services. In addition, it offers elevated concrete pouring for columns, elevated beams, and structural walls; and light commercial services comprising slabs, sidewalks, ramps, and tilt walls. The company was founded in 1994 and is headquartered in Houston, Texas.