CF Industries Holdings, Inc., together with its subsidiaries, engages in the manufacture and sale of hydrogen and nitrogen products for energy, fertilizer, emissions abatement, and other industrial activities in North America, Europe, and internationally. It operates through Ammonia, Granular Urea, UAN, AN, and Other segments. The company's principal products include anhydrous ammonia, granular urea, urea ammonium nitrate, and ammonium nitrate products. It also offers diesel exhaust fluid, urea liquor, nitric acid, and aqua ammonia products. The company primarily serves cooperatives, independent fertilizer distributors, traders, wholesalers, and industrial users. CF Industries Holdings, Inc. was founded in 1946 and is headquartered in Northbrook, Illinois.

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.

CECO Environmental Corp. provides critical solutions in industrial air quality, industrial water treatment, and energy transition solutions worldwide. It operates in two segments: Engineered Systems and Industrial Process Solutions. The company engineers, designs, manufactures, and installs non-metallic expansion joints and flow control products, including rubber expansion joints, ducting expansion joints, and industrial pinch and duck bill valves; membrane-based industrial water and wastewater treatment systems; and provides dust and fume extraction solutions comprising consultation, design, manufacturing, installation, and service, as well as water and wastewater treatment solutions. It offers engineered and configured products and solutions, including dampers and diverters, expansion joints, selective catalytic reduction systems, severe-service and industrial cyclones, dust collectors, thermal oxidizers, filtration systems, wet and dry scrubbers, separators and coalescers, water treatment packages, metallic and non-metallic pumps, industrial silencers, and fluid handling equipment, as well as plant engineering services and engineered design build fabrication services. In addition, the company offers industrial engineered noise control solutions, including custom acoustical gen-set packages, ambient air baffles, acoustical louvres, and skid enclosures; process filtration solutions for hydrocarbon and chemical processing; and energy and water conservation systems and equipment. The company markets its products and services to natural gas processors, transmission and distribution companies, refineries, power generators, industrial manufacturing, engineering and construction companies, semiconductor manufacturers, compressor manufacturers, beverage can manufacturers, metals and minerals, and electric vehicle producers. CECO Environmental Corp. was founded in 1869 and is headquartered in Dallas, Texas.

Flotek Industries, Inc. operates as a technology-driven green chemistry and data company that serves customers across industrial and commercial markets in the United States, the United Arab Emirates, and internationally. It operates through two segments: Chemistry Technologies (CT) and Data Analytics (DA). The CT segment designs, develops, manufactures, packages, distributes, delivers, and markets green specialty chemicals that enhance the profitability of hydrocarbon producers, as well as green specialty chemistries, and logistics and technology services. This segment primarily serves integrated oil and gas, oilfield services, independent oil and gas, national and state-owned oil, geothermal energy, solar energy, and alternative energy companies. The DA segment designs, develops, produces, sells, and supports equipment and services that create and provide valuable information on the composition and properties of energy customers' hydrocarbon fluids. It sells its products directly through a mix of in-house sales professionals, as well as contractual agency agreements. Flotek Industries, Inc. was incorporated in 1985 and is headquartered in Houston, Texas.

Profire Energy, Inc., a technology company, engages in the engineering and design of burner, and combustion management systems and solutions for natural and forced draft applications in the United States and Canada. It primarily focuses on the upstream, midstream, and downstream transmission segments of the oil and gas industry. The company also sells and installs its systems in South America, Europe, Africa, the Middle East, and Asia. Profire Energy, Inc. was incorporated in 2002 and is headquartered in Lindon, Utah.

FuelCell Energy, Inc., together with its subsidiaries, manufactures and sells stationary fuel cell and electrolysis platforms that decarbonize power and produce hydrogen. The company provides various configurations and applications of its platform, including on-site power, utility grid support, and microgrid, as well as distributed hydrogen; solid oxide-based electrolysis; solutions for long duration hydrogen-based energy storage and electrolysis technology; and carbon capture, separation, and utilization systems. It also offers technology to produce electricity, heat, hydrogen, and water. In addition, the company provides turn-key solutions, including development, engineering, procurement, construction, interconnection, and operation services. It serves various markets, including utilities and independent power producers, industrial and process applications, education and health care, data centers and communication, wastewater treatment, government, commercial and hospitality, microgrids, manufacturing, industrial hydrogen, port, oil and gas, wind and solar projects, food and beverage, hydrogen for mobility and material handling, and hydrogen fuel for heat, as well as engineering, procurement, and construction firms. The company primarily operates in the United States, South Korea, and Europe. FuelCell Energy, Inc. was founded in 1969 and is headquartered in Danbury, Connecticut.

Babcock & Wilcox Enterprises, Inc., together with its subsidiaries, provides energy and emissions control solutions to industrial, electrical utility, municipal, and other customers worldwide. The company operates through three segments: Babcock & Wilcox Renewable; Babcock & Wilcox Environmental; and Babcock & Wilcox Thermal. The Babcock & Wilcox Renewable segment offers technologies divert the waste from landfills for power generation and replacing fossil fuels and recovering metals and reducing emissions. It offers BrightLoop, a hydrogen generation technology that generates hydrogen from a range of fuels, including solid fuels, such as biomass and coal. This segment also provides technologies for power and heat generation comprising waste-to-energy; OxyBright, an oxygen-fired biomass-to-energy technology; and black liquor systems for the pulp and paper industry. The Babcock & Wilcox Environmental segment offers a range of emissions control and environmental technology solutions for utility, waste to energy, biomass, carbon black, and industrial steam generation applications. This segment provides systems for cooling, ash handling, particulate control, nitrogen oxides and sulfur dioxides removal, chemical looping for carbon control, and mercury control under the SolveBright, OxyBright, BrightLoop, and BrightGen names. The Babcock & Wilcox Thermal segment offers aftermarket parts, construction, maintenance, engineered upgrades, and field services for its installed bases, as well as the installed base of other OEMs for power generation, oil and gas, petrochemical, food and beverage, metals and mining, and others. This segment also provides steam generation systems, including package boilers, watertube and firetube waste heat boilers, and other boilers to medium and heavy industrial customers. Babcock & Wilcox Enterprises, Inc. was founded in 1867 and is based in Akron, Ohio.

ClearSign Technologies Corporation designs and develops products and technologies to enhance emission and operational performance, energy efficiency, emission reduction, safety, and overall cost-effectiveness of industrial and commercial systems in the United States, the People's Republic of China, and Hong Kong. The company's technologies include ClearSign core burner technology consists of an industrial burner body and a downstream porous ceramic or metal flame stabilizing structure; ClearSign core process burner technology that provides a direct burner replacement for traditional refinery process heaters; ClearSign core boiler burner technology; ClearSign core flaring burners that can be used individually, or in combination, to provide a flare product with extremely low nitrogen oxide emissions; and ClearSign eye flame sensor, an electrical flame sensor for industrial applications. It serves energy, institutional, commercial and industrial boiler, chemical, and petrochemical industries. The company was formerly known as ClearSign Combustion Corporation and changed its name ClearSign Technologies Corporation in November 2019. ClearSign Technologies Corporation was incorporated in 2008 and is headquartered in Tulsa, Oklahoma.