Energy Services of America Corp. is a contractor and service company. It operates through the following segments: Underground Infrastructure Construction, Industrial Construction, and Building Construction. The Underground Infrastructure Construction segment primarily includes water and wastewater pipelines, natural gas distribution pipelines, natural gas transmission pipelines, natural gas stations and ancillary facilities, corrosion protection services, and horizontal drilling services. The Industrial Constructions segment involves electrical, mechanical, HVAC/R, controls, and fire protection services in automotive, chemical, power, and manufacturing facilities. The Building Construction segment refers to schools, local and state buildings, and small bridge projects. The company was founded in 2006 and is headquartered in Huntington, WV.

Primoris Services Corp. is a holding company, which engages in the provision of construction, fabrication, maintenance, replacement, and engineering services. It operates through the Utilities and Energy segments. The Utilities segment specializes in a range of services, including telecommunications and installation and maintenance of new and existing natural gas and electric utility distribution and transmission systems. The Energy segment operates throughout the United States and Canada and specializes in a range of services that include engineering, procurement, construction, and maintenance services for entities in the energy, renewable energy and energy storage, renewable fuels, and petroleum and petrochemical industries, as well as state departments of transportation. The company was founded by Brian Patt in 1960 and is headquartered in Dallas, TX.

MasTec, Inc. engages in the provision of infrastructure construction services. It operates through the following segments: Communications, Oil and Gas, Clean Energy and Infrastructure, and Other. The Communications segment performs engineering, construction, maintenance, and customer fulfillment activities related to communications infrastructure, primarily for wireless and wireline/fiber communications, and install-to-the-home customers. The Oil and Gas segment offers services on oil and natural gas pipelines and processing facilities for the energy and utilities industries. The Clean Energy and Infrastructure segment serves energy, utility and other end-markets through the installation and construction of power generation facilities, including from clean energy and renewable sources such as wind, solar and biomass, as well as various types of heavy civil and industrial infrastructure. The Other segment consists of equity investors, other small business units that perform construction, and other services for a variety of international end-markets. The company was founded by Jorge Mas Canosa on July 26, 1968, and is headquartered in Coral Gables, FL.

MYR Group, Inc. is a holding company, which engages in the provision of electrical construction services. It operates through the Transmission and Distribution (T&D) and Commercial and Industrial (C&I) segments. The T&D segment offers a range of services on electric transmission and distribution networks and substation facilities. The C&I segment includes the design, installation, maintenance and repair of commercial and industrial wiring, installation of traffic networks and the installation of bridge, roadway, and tunnel lighting. The company was founded in 1995 and is headquartered in Thornton, CO.