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.

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.

MasTec, Inc., an infrastructure construction company, provides engineering, building, installation, maintenance, and upgrade services for communications, energy, utility, and other infrastructure primarily in the United States and Canada. It operates through five segments: Communications, Clean Energy and Infrastructure, Oil and Gas, Power Delivery, and Other. The company build infrastructure for wireless and wireline/fiber communications; clean energy infrastructure comprising renewable energy power generation; pipeline infrastructure, including natural gas, water, carbon capture sequestration, and other product transport; power delivery services, such as electrical and gas transmission, and distribution systems; industrial and heavy civil infrastructure, including roads, bridges, and rail; and water infrastructure. It also installs electrical and other gas distribution and transmission systems, power generation, power generation, civil and industrial facilities, pipelines, and fiber optic and other cables, as well as install-to-the-home services. In addition, the company offers maintenance and upgrade support services comprising maintenance of customers' distribution facilities, networks, and infrastructure, including communications, power generation, pipeline, electrical distribution and transmission, and civil and industrial and heavy civil infrastructure; service restoration for natural disasters and accidents; and routine replacements and upgrades to overhauls. Its customers include wireless and wireline/fiber service providers, broadband operators, install-to-the-home service providers, public and private energy providers, including renewable and other energy providers, pipeline operators, civil and industrial infrastructure providers, and government entities. MasTec, Inc. was founded in 1929 and is headquartered in Coral Gables, Florida.

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.

IES Holdings, Inc. engages in the design and installation of integrated electrical and technology systems, and provides infrastructure products and services in the United States. The Communications segment designs, installs, and maintains network infrastructure within data centers for co-location and managed hosting customers; corporate, educational, financial, hospitality, and healthcare buildings; e-commerce distribution centers; and high-tech manufacturing facilities. This segment also provides design and installation services for audio/visual, telephone, fire, and wireless access and intrusion alarm systems; and engages in designing/building, servicing, and maintaining data network systems. The Residential segment offers electrical installations to single-family housing and multi-family apartments; and cable television installations to residential and light commercial applications, as well as installs residential solar power for new construction and existing residences. The Infrastructure Solutions segment maintains and repairs alternating and direct current electric motors and generators, and power generating and distribution equipment; manufactures custom-engineered metal enclosed bus duct solutions used in power distribution; manufactures custom commercial and industrial generator enclosures; manufactures, re-manufactures, and repairs industrial lifting magnets; and maintains and repairs railroad main and auxiliary generators, main alternators, and traction motors. The Commercial & Industrial segment offers electrical and mechanical design, construction, and maintenance services for office buildings, manufacturing facilities, data centers, chemical plants, refineries, wind farms, solar facilities, municipal infrastructures, and health care facilities. The company was formerly known as Integrated Electrical Services, Inc. and changed its name to IES Holdings, Inc. in May 2016. IES Holdings, Inc. was incorporated in 1997 and is headquartered in Houston, Texas.

INNOVATE Corp., through its subsidiaries, operates in infrastructure, life sciences, and spectrum areas in the United States. The Infrastructure segment provides industrial construction, structural steel, and facility maintenance services, such as fabrication and erection of structural steel and heavy steel plate services, and large-diameter water pipes and water storage tanks; fabrication of trusses and girders; and 3-D building information modeling and detailing for commercial, industrial, and infrastructure construction projects, such as buildings and office complexes, hotels and casinos, convention centers, sports arenas and stadiums, shopping malls, hospitals, dams, bridges, mines, metal processing, refineries, pulp and paper mills, and power plants. This segment also offers solutions for digital engineering, modeling and detailing, construction, and heavy equipment installation and facility services including maintenance, repair, and installation; and manufactures pollution control scrubbers, tunnel liners, pressure vessels, strainers, filters, separators, and customized products. The Life Sciences segment develops products to treat early osteoarthritis of the knee; and aesthetic and medical technologies for the skin. The Spectrum segment operates over-the-air broadcasting stations across the United States; and Azteca America, a Spanish-language broadcast network. The company was formerly known as HC2 Holdings, Inc. and changed its name to INNOVATE Corp. in September 2021. The company was incorporated in 1994 and is headquartered in New York, New York.

Star Equity Holdings, Inc. engages in the construction business in the United States and internationally. It operates through two segments: Construction, and Investments. It manufactures modular housing units, structural wall panels, permanent wood foundation systems, and other engineered wood products; supplies general contractors with building materials; holds real estate assets; and manages investments. The company was formerly known as Digirad Corporation and changed its name to Star Equity Holdings, Inc. in December 2020. Star Equity Holdings, Inc. was founded in 1985 and is headquartered in Old Greenwich, Connecticut.

Southland Holdings, Inc. engages in specialty infrastructure construction business in North America and internationally. The company operates through two segments, Civil and Transportation. The Civil segment designs and constructs water pipelines, pump stations, lift stations, water and wastewater treatment plants, concrete and structural steel, outfall, and tunneling. The Transportation segment designs and constructs bridges, roadways, marine, dredging, ship terminals and piers, and specialty structures and facilities, as well as convention centers, sports stadiums, marine facilities, and ferris wheels. Southland Holdings, Inc. was founded in 1900 and is headquartered in Grapevine, Texas.