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.

UL Solutions Inc. provides safety science services worldwide. It operates through three segments: Industrial, Consumer, and Software and Advisory. The Industrial segment provides testing, inspection, and certification services across various end markets, including energy, industrial automation, engineered materials, and built environment, as well as stakeholders, such as manufacturers, building owners, end users, and regulators. The Consumer segment offers safety certification testing, ongoing certification, global market access, testing for connectivity, performance and quality, and critical systems advisory and training services, as well as product market acceptance and risk mitigation services for customers in the consumer products end markets comprising consumer electronics, medical devices, information technologies, appliances, HVAC, lighting, and retail, as well as consumer applications, such as new mobility, smart products, and 5G. The Software and Advisory segment provide software and technical advisory services that enable customers to manage regulatory requirements, deliver supply chain transparency, and operationalize sustainability. It offers ULTRUS software brand to help customers improve speed to market, sustainability and safety. UL Solutions Inc. was formerly known as UL Inc. and changed its name to UL Solutions Inc. in June 2022. The company was founded in 1894 and is headquartered in Northbrook, Illinois. UL Solutions Inc. is a subsidiary of ULSE Inc.

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.

Atkore Inc. engages in the manufacture and sale of electrical, mechanical, safety, and infrastructure products and solutions in the United States and internationally. The company offers conduits, cables, and installation accessories. It also designs and manufactures protection and reliability solutions for critical infrastructure, such as metal framing, mechanical pipe, perimeter security, and cable management. The company offers its products under the Allied Tube & Conduit, AFC Cable Systems, Kaf-Tech, Heritage Plastics, Unistrut, Power-Strut, Cope, US Tray, FRE Composites, United Poly Systems, Calbond, and Calpipe. It serves various end markets, including new construction; maintenance, repair, and remodel; infrastructure; diversified industrials; alternative power generation; healthcare; data centers; and governments through electrical, industrial, and mechanical contractors, as well as original equipment manufacturers. The company was formerly known as Atkore International Group Inc. and changed its name to Atkore Inc. in February 2021. Atkore Inc. was founded in 1959 and is headquartered in Harvey, Illinois.

NPK International Inc. provides products, rentals, and services primarily to the oil and natural gas exploration and production (E&P) industry. It operates through two segments, Fluids Systems and Industrial Solutions. The Fluids Systems segment provides drilling, completion, and stimulation fluids products and related technical services to customers primarily in the North America, Europe, the Middle East, and Africa, as well as other countries in the Asia Pacific and Latin America. The Industrial Solutions segment offers composite matting system rentals utilized for temporary worksite access; related site construction and services to customers in various markets, including power transmission, E&P, pipeline, renewable energy, petrochemical, construction, and other industries primarily in the United States and Europe; recyclable composite mats to customers worldwide; and access road construction, site planning and preparation, environmental protection, erosion control, and site restoration services. The company was formerly known as Newpark Resources, Inc. and changed its name to NPK International Inc. in December 2024. The company was incorporated in 1932 and is headquartered in The Woodlands, Texas.

Mistras Group, Inc. provides technology-enabled asset protection solutions in the United States, other Americas, Europe, and the Asia-Pacific. The company offers non-destructive testing services; inline inspection for pipelines; and plant condition management software. It also provides maintenance and light mechanical services, such as corrosion removal, mitigation and prevention, insulation installation and removal, electrical, heat tracing, industrial cleaning, pipefitting, and welding; engineering consulting services primarily for process equipment, technologies, and facilities; and utilizes scaffolding and rope access to access at-height and confined assets. In addition, the company offers certified divers for subsea inspection and maintenance; unmanned aerial, land-based, and subsea systems for inspection applications; online condition-monitoring solutions; quality assurance and quality control solutions for new and existing metal and alloy components, materials, and composites. Further, it builds monitoring systems, as well as provides inspection, maintenance, monitoring and data services; and Web-based solutions. Additionally, the company designs, manufactures, and sells acoustic emission sensors, instruments, and turnkey systems for monitoring and testing materials, pressure components, processes, and structures; and ultrasonic testing equipment. It serves oil and gas, aerospace and defense, fossil and nuclear power, power generation and transmission, civil infrastructure, manufacturing, industrial, public infrastructure, petrochemical, transportation, and other process industries, as well as infrastructure, research, and engineering industries. Mistras Group, Inc. was founded in 1978 and is headquartered in Princeton Junction, New Jersey.

ENGlobal Corporation provides engineering and professional project execution services primarily to the energy sector in the United States and internationally. It operates in two segments, Commercial and Government Services. The Commercial segment provides multi-disciplined engineering services and fabrication relating to the development, management, and execution of projects requiring professional engineering and related project management services. It offers conceptual studies, project definition, cost estimating, engineering design, environmental compliance, material procurement, project management, construction management, and fabrication services. The Government Services segment provides design, integration and implementation of process distributed control and analyzer systems, advanced automated data gathering systems, information technology, and the maintenance of these systems; and electrical and instrument installation, technical services, ongoing maintenance, calibration, and repair services. It also provides services related to the engineering, design, installation, and maintenance of automated fuel handling and tank gauging systems for the United States military. The company serves Fortune 500 companies in the energy industry and the United States government. The company was formerly known as Industrial Data Systems Corporation and changed its name to ENGlobal Corporation in June 2002. ENGlobal Corporation was founded in 1985 and is headquartered in Houston, Texas.