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Aegion Corporation provides technologies to maintain, rehabilitate, and strengthen infrastructure in the United States, Canada, Europe, and internationally. It operates through two segments, Infrastructure Solutions and Corrosion Protection. The company offers various solutions for rehabilitating and maintaining aging or deteriorating infrastructure; protecting new infrastructure from corrosion and other threats; and providing integrated professional services in engineering, procurement, construction, maintenance, and turnaround services for oil and natural gas companies. Its solutions include rehabilitation of water and wastewater pipelines; fusible polyvinyl chloride products for rehabilitation and new installation; fiber reinforced polymer systems for rehabilitation and strengthening; cathodic protection for corrosion engineering control and infrastructure rehabilitation; pipe coatings for corrosion and thermal control and prevention; thermoplastic pipe lining for corrosion control, abrasion protection, and pipeline rehabilitation; and construction and maintenance of oil and gas facilities. The company serves municipal, state, and federal governments, as well as corporate customers in various industries, including pipelines, energy, oil and gas, refinery, mining, general and industrial construction, infrastructure, water and wastewater, transportation, utilities, maritime, and defense. Aegion Corporation was founded in 1971 and is headquartered in Saint Louis, Missouri.

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.

Quanex Building Products Corporation, together with its subsidiaries, provides components for the fenestration industry in the United States, rest of Europe, Canada, Asia, the United Kingdom, and internationally. The company operates through three segments: North American Fenestration, European Fenestration, and North American Cabinet Components. It offers flexible insulating glass spacers, extruded vinyl profiles, window and door screens, and precision-formed metal and wood products, as well as cabinet doors and other components for original equipment manufacturers (OEMs) in the kitchen and bathroom cabinet industry. In addition, the company provides various non-fenestration components and products, including solar panel sealants, trim moldings, vinyl decking, fencing, water retention barriers, and conservatory roof components. It sells its products to OEMs in the building products industry through sales representatives, direct sales force, distributors, and independent sales agents. Quanex Building Products Corporation was founded in 1927 and is based in Houston, Texas.

Tutor Perini Corporation, a construction company, provides diversified general contracting, construction management, and design-build services to private customers and public agencies in the United States and internationally. It operates through three segments: Civil, Building, and Specialty Contractors. The Civil segment engages in the public works construction and the replacement and reconstruction of infrastructure; and offers contracting services, including construction and rehabilitation of highways, bridges, tunnels, mass-transit systems, military defense facilities, and water management and wastewater treatment facilities, as well as provides drilling, foundation, and excavation support for shoring, bridges, piers, roads, and highway projects. The Building segment offers range of services in various specialized building markets, such as hospitality and gaming, transportation, health care, commercial offices, government facilities, sports and entertainment, education, correctional and detention facilities, biotech, pharmaceutical, industrial, and technology. The Specialty Contractors segment provides electrical, mechanical, plumbing, and fire protection systems, as well as heating, ventilation, and air conditioning services (HVAC) for civil and building construction projects in industrial, commercial, hospitality and gaming, and mass-transit end markets. It also offers pre-construction planning and project management services comprising planning and scheduling of the manpower, equipment, materials, and subcontractor services; and self-performed construction services consisting of site work, concrete forming and placement, and steel erection. The company was formerly known as Perini Corporation and changed its name to Tutor Perini Corporation in May 2009. Tutor Perini Corporation was founded in 1894 and is headquartered in Sylmar, California.

United States Lime & Minerals, Inc. manufactures and supplies lime and limestone products in the United States. It extracts limestone from open-pit quarries and an underground mine, and processes it as pulverized limestone, quicklime, hydrated lime, and lime slurry. The company supplies its products primarily to the construction customers, including highway, road, and building contractors; industrial customers, such as paper and glass manufacturers; environmental customers comprising municipal sanitation and water treatment facilities, and flue gas treatment processes; oil and gas services companies; roof shingle manufacturers; and poultry producers. In addition, it has various royalty interests with respect to oil and gas rights in natural gas wells located in Johnson County, Texas in the Barnett Shale Formation. The company was incorporated in 1950 and is headquartered in Dallas, Texas. United States Lime & Minerals, Inc. operates as a subsidiary of Inberdon Enterprises Ltd.