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Altair Engineering Inc., together with its subsidiaries, provides software and cloud solutions in the areas of simulation and design, high-performance computing, data analytics, and artificial intelligence in the United States and internationally. It operates in two segments, Software and Client Engineering Services. The Software segment offers solvers and optimization technology products, high-performance computing software applications and hardware products, modeling and visualization tools, data analytics and analysis products, and Internet of Things platform and analytics tools, as well as support and the complementary software products. This segment also provides software technologies in the areas of computational fluid dynamics and fatigue, manufacturing process simulation, and cost estimation for the applications in automotive, marine, motorcycle, aerospace, chemical, and architecture industries; and software-related services, such as consulting, implementation, and training services that focuses on the product design and development expertise and analysis from the component level up to complete product engineering at various stage of the lifecycle. The Client Engineering Services segment provides client engineering services. In addition, the company is involved in the development and sale of solid state lighting technology along with communication and control protocols based on its intellectual property for the direct replacement of fluorescent tubes with LED lighting. Its integrated suite of software optimizes design performance across various disciplines, including structures, motion, fluids, thermal management, electromagnetics, system modeling, and embedded systems. The company serves universities, government agencies, manufacturers, pharmaceutical firms, banking, financial services, and insurance, weather prediction agencies, and electronics design companies. Altair Engineering Inc. was incorporated in 1985 and is headquartered in Troy, Michigan.

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.

Comfort Systems USA, Inc., together with its subsidiaries, provides mechanical and electrical installation, renovation, maintenance, repair, and replacement services for the mechanical and electrical services industry in the United States. It operates through two segments, Mechanical and Electrical. The company offers heating, ventilation, and air conditioning systems, as well as plumbing, electrical, piping and controls, off-site construction, monitoring, and fire protection. It also engages in the design, engineering, integration, installation, and start-up of mechanical, electrical, and plumbing (MEP) and related systems in new buildings; and renovation, expansion, maintenance, monitoring, repair, and replacement of MEP systems in existing buildings. In addition, the company provides remote monitoring of power usage, temperature, pressure, humidity and air flow for MEP and other building systems. It serves building owners and developers, general contractors, architects, consulting engineers, and property managers in the commercial, industrial, and institutional MEP markets. Comfort Systems USA, Inc. was founded in 1917 and is headquartered in Houston, Texas.

Fluor Corporation provides engineering, procurement, and construction (EPC); fabrication and modularization; operation and maintenance; asset integrity; and project management services worldwide. The company operates through Energy Solutions, Urban Solutions, Mission Solutions, and Other segments. The Energy Solutions segment provides solutions to the energy transition markets, including asset decarbonization, carbon capture, renewable fuels, waste-to-energy, green chemicals, hydrogen, nuclear power, and other low-carbon energy sources. It also provides consulting services, including feasibility studies, process assessments, and project finance structuring; and a range of services for small modular reactor technologies, conventional and advanced nuclear reactor technologies. This segment serves the production and fuels, chemicals, LNG, power markets, chemicals and petrochemical industries. The Urban Solutions segment offers EPC and project management services to the infrastructure, advanced technologies, life sciences, and mining and metals industries. This segment also provides staffing services to the company and third-party clients with technical, professional, and craft resources on a contract or permanent placement basis. The Mission Solutions segment offers technical solutions to the U.S. and other governments. It also delivers solutions for nuclear security and operation, nuclear waste management, and laboratory management; and operation and maintenance, logistics, EPC, and life support solutions for mission-critical facilities across U.S. military service organizations. This segment offers site management, environmental remediation, and decommissioning for nuclear remediation at governmental facilities, as well as services to commercial nuclear clients. Fluor Corporation was founded in 1912 and is headquartered in Irving, Texas.