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.

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.

CSW Industrials, Inc. operates as a diversified industrial company in the United States and internationally. It operates through three segments: Contractor Solutions, Engineered Building Solutions, and Specialized Reliability Solutions. The Contractor Solutions segment provides condensate pads, pans, pumps, switches, and traps; cements, diffusers, grilles, registers, solvents, thread sealants, and vents; line set covers; refrigerant caps; wire pulling head tools; electrical protection, maintenance chemicals, and installation supplies; ductless mini-split systems installation support tools and accessories; and drain waste and vent system products for use in for heating, ventilation, air conditioning, refrigeration, plumbing, general industrial, architecturally specified building products. The Engineered Building Solutions segment offers architectural railings and associated services; fire and smoke protection solutions; fire stopping solutions; and pre-engineered and custom architectural building components for use in architecturally specified building products. The Specialized Reliability Solutions segment provides anti-seize products; compounds, lubricants, lubricant management products, and sealants; desiccant breather filtration products; and contamination control, industrial maintenance and repair, rail friction modifiers, sealants, and operations solutions for use in energy, general industrial, mining, and rail transportation. The company was incorporated in 2014 and is headquartered in Dallas, Texas.

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.

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.

Powell Industries, Inc., together with its subsidiaries, designs, develops, manufactures, sells, and services custom-engineered equipment and systems. The company's principal products include integrated power control room substations, custom-engineered modules, electrical houses, medium-voltage circuit breakers, monitoring and control communications systems, motor control centers, switches, and bus duct systems, as well as traditional and arc-resistant distribution switchgears and control gears. Its products have application in voltages ranging from 480 volts to 38,000 volts. The company also provide field service inspection, installation, commissioning, modification and repair, spare parts, retrofit and retrofill components for existing systems, and replacement circuit breakers for switchgear. It serves onshore and offshore production, liquefied natural gas facilities and terminals, pipelines, refineries, and petrochemical plants, as well as electric utility, light rail traction power, mining and metals, pulp and paper, data centers and other municipal, commercial, and industrial markets. The company has operations in the United States, Canada, the Middle East, Africa, Europe, Mexico, and Central and South America. Powell Industries, Inc. was founded in 1947 and is headquartered in Houston, Texas.

Limbach Holdings, Inc. operates as a building systems solution company in the United States. It operates through two segments, General Contractor Relationships and Owner Direct Relationships. The company engages in the construction and renovation projects that involve primarily include mechanical, plumbing, and electrical services. It also provides critical system repair, MEP infrastructure projects, maintenance contracts, building automation upgrades, data driven insights, and program management services. In addition, it offers captive engineering capabilities, estimating and virtual design; and professional engineering, energy analysis, estimation, and detail design and three-dimensional building installation coordination services. The company serves research, acute care, and inpatient hospitals; public and private colleges, universities, research centers; sports arenas; entertainment facilities, and amusement rides and parks; data centers; automotive, energy and general manufacturing plants; and life sciences, including organizations and companies, whose work is centered around research and development focused on living things. Limbach Holdings, Inc. was founded in 1901 and is headquartered in Warrendale, Pennsylvania.

Team, Inc., together with its subsidiaries, provides a suite of conventional, specialized, and proprietary mechanical, heat-treating, and inspection services in the United States, Canada, Europe, and internationally. It operates through Inspection and Heat Treating (IHT) and Mechanical Services (MS) segments. The IHT segment offers non-destructive evaluation and testing, radiographic testing, ultrasonic testing, magnetic particle inspection, liquid penetrant inspection, positive material identification, electromagnetic testing, alternating current field measurement, and eddy current testing services. This segment also provides long-range guided ultrasonic, phased array ultrasonic testing, terminals and storage inspection and management program, rope access, mechanical and pipeline integrity, and heat treating services. The MS segment offers engineered composite repair, emissions control/compliance, hot tapping, valve insertion, field machining, bolted joint integrity, vapor barrier plug and weld testing, and valve management services, as well as leak repair services. Team, Inc. was founded in 1973 and is headquartered in Sugar Land, Texas.