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Argan, Inc., through its subsidiaries, provides engineering, procurement, construction, commissioning, maintenance, project development, technical, and consulting services to the power generation market. The company operates through Power Industry Services, Industrial Fabrication and Field Services, and Telecommunications Infrastructure Services segments. The Power Industry Services segment offers engineering, procurement, and construction contracting services to the owners of alternative energy facilities, such as biomass plants, wind farms, and solar fields; and design, construction, project management, start-up, and operation services for projects with approximately 16 gigawatts of power-generating capacity. This segment serves independent power project owners, public utilities, power plant equipment suppliers, and other commercial firms. The Industrial Fabrication and Field Services segment provides construction and field services and vessel fabrication services for fertilizer, lithium technology, engineering and construction, forest products, industrial gas, mining, and other companies in southeast region of the United States. The Telecommunications Infrastructure Services segment offers trenchless directional boring and excavation for underground communication and power networks, as well as aerial cabling services; and installs buried cable, high and low voltage electric lines, and private area outdoor lighting systems. It also provides structured cabling, terminations, and connectivity that offers the physical transport for high-speed data, voice, video, and security networks. This segment serves electricity cooperative, state and local government agencies, regional communications service providers, and other commercial customers, as well as contractors, other commercial firms, and federal government facilities in the mid-Atlantic region of the United States. Argan, Inc. was incorporated in 1961 and is headquartered in Rockville, Maryland.

Ameresco, Inc., a clean technology integrator, provides a portfolio of energy efficiency and renewable energy supply solutions in the United States, Canada, Europe, and internationally. It operates through U.S. Regions, U.S. Federal, Canada, Europe, Alternative Fuels, and All Other segments. The company offers energy efficiency, infrastructure upgrades, energy security and resilience, asset sustainability, and renewable energy solutions for businesses and organizations. It designs, develops, engineers, and installs projects that reduce the energy, as well as operations and maintenance (O&M) costs of its customers' facilities; and projects primarily include various measures customized for the facility and designed to enhance the efficiency of building systems, such as heating, ventilation, cooling, and lighting systems. In addition, the company offers renewable energy solutions and services, such as the construction of small-scale plants that the company owns or develops for customers that produce electricity, gas, heat, or cooling from renewable sources of energy and O&M services; and electricity, processed renewable gas fuel, and heat or cooling produced from renewable sources of energy. Further, the company sells photovoltaic (PV) solar energy products and systems, as well as provides consulting, and enterprise energy management services; and operates wind farms. It serves the federal, state, local governments, healthcare and educational institutions, airports, public housing authorities and public universities, municipal utilities, and commercial and industrial customers. As of December 31, 2023, the company owned and operated 185 small-scale renewable energy plants and solar PV installations. Ameresco, Inc. was incorporated in 2000 and is headquartered in Framingham, Massachusetts.

Concrete Pumping Holdings, Inc. provides concrete pumping and waste management services in the United States and the United Kingdom. The company offers concrete pumping services to general contractors and concrete finishing companies in the commercial, infrastructure, and residential sectors under the Brundage-Bone and Capital Pumping brands; and industrial cleanup and containment services primarily to customers in the construction industry under the Eco-Pan brand. It leases and rents concrete pumping equipment, pans, and containers. As of October 31, 2023, the company owned a fleet of approximately 930 boom pumps, 90 placing booms, 20 telebelts, 300 stationary pumps, and 115 waste management trucks. Concrete Pumping Holdings, Inc. was founded in 1983 and is headquartered in Thornton, Colorado.

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.

Matrix Service Company provides engineering, fabrication, construction, and maintenance services to support critical energy infrastructure and industrial markets in the United States, Canada, and internationally. It operates through three segments: Utility and Power Infrastructure; Process and Industrial Facilities; and Storage and Terminal Solutions. The Utility and Power Infrastructure segment offers power delivery services, including construction of new substations, upgrades of existing substations, transmission and distribution line installations, and upgrades and maintenance, and emergency and storm restoration services. This segment also provides engineering, fabrication, and construction services for LNG utility peak shaving facilities; and construction and maintenance services to power generation facilities, including natural gas fired facilities. The Process and Industrial Facilities segment engages in the refining and processing of crude oil; fractionating and marketing of natural, gas and natural gas liquids; and offers plant maintenance, turnarounds, engineering, industrial cleaning services, and capital construction services. The Storage and Terminal Solutions segment undertakes work related to aboveground crude oil and refined product storage tanks and terminals; engineering, procurement, fabrication, and construction services related to cryogenic and other specialty tanks and terminals for LNG, NGLs, hydrogen, ammonia, propane, butane, liquid nitrogen/liquid oxygen, and liquid petroleum; and provides plant work, truck and rail loading/offloading facilities, and marine structures, as well as storage tank and terminal maintenance and repair. This segment also manufactures and sells precision engineered specialty tank products, including geodesic domes, aluminum internal floating roofs, floating suction and skimmer systems, roof drain systems, and floating roof seals. Matrix Service Company was founded in 1984 and is headquartered in Tulsa, Oklahoma.