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Advent Technologies Holdings, Inc., an advanced materials and technology development company, operates in the fuel cell and hydrogen technology markets in North America, Europe, and Asia. It develops, manufactures, and assembles fuel cell systems and critical components that determine the performance of hydrogen fuel cells and other energy systems. The company offers high-temperature proton exchange membrane (HT-PEM) fuel cells, including membrane electrode assemblies, bipolar plates, and reformers, as well as provides fuel-cell stack assembly and testing services. It serves stationary power, portable power, automotive, aviation, energy storage, and sensor markets. The company is headquartered in Boston, Massachusetts.

H2O Innovation Inc. designs and provides integrated water treatment solutions based on membrane filtration technology. It operates through three segments: Water Technologies and Services, Specialty Products, and Operation and Maintenance Services. The company offers membrane filtration technology for municipal, industrial, energy, and natural resources end-users; and aftersales services, as well as digital solutions to monitor and optimize water treatment plants. Its products include the FiberFlex open-source technologies for water treatment systems; the flexMBR for wastewater treatment systems; SILO system for wastewater and water reuse treatment; and FlexBox, a mobile fleet of water and wastewater treatment systems, such as containerized ultrafiltration or reverse osmosis (RO) systems. The company also offers specialty chemicals, consumables, and specialized products for the water industry, including RO membrane chemicals, such as antiscalants, flocculants, biocides, and cleaning chemicals; corrosion resistant equipment for desalination plants; flexible grooved-end couplings, fiberglass reinforced polyester cartridge filter housings, self-cleaning disc and screen filters, bag filters, cartridges, and strainers; and maple farming equipment. In addition, it operates, maintains, and repairs water and wastewater treatment systems, distribution equipment, and associated assets. The company was incorporated in 1995 and is headquartered in Quebec City, Canada. As of December 8, 2023, H2O Innovation Inc. was taken private.

Nanophase Technologies Corporation, a science-driven company, develops, manufactures, and sells integrated family of nanomaterial technologies in the United States. It engages in engineered materials, formulation development, and commercial manufacturing. The company produces engineered nanomaterial products comprising antimony, bismuth, cerium, iron, and zinc oxide for use in a various markets, including surface finishing,exterior coatings, personal care, plastics, scratch resistant coatings, and textiles. It also provides skin care formulations with mineral-based UV protection under the under the Solésence brand; and advanced material products, including architectural coatings, industrial coatings, abrasion-resistant additives, plastics additives, medical diagnostics, and surface finishing technologies applications. The company was incorporated in 1989 and is headquartered in Romeoville, Illinois.

Synalloy Corporation, through its subsidiaries, manufactures and sells metals and specialty chemicals in the United States and internationally. The company's Metals segment manufactures welded pipes and tubes, primarily from stainless steel, duplex, and nickel alloys; and galvanized carbon tubes, as well as related stainless pipe products. The segment also manufactures ornamental stainless-steel tubes for supply to the automotive, commercial transportation, marine, food services, construction, furniture, healthcare, and other industries; provides fiberglass and steel storage tanks for the oil and gas, waste water treatment, and municipal water industries; and distributes hot finish, seamless, carbon steel pipes, and tubes for use in mechanical and high-pressure applications in the oil and gas, heavy industrial, construction equipment, and chemical and other industries. Its Specialty Chemicals segment produces defoamers, surfactants, and lubricating agents for end users, including companies that supply agrochemical paper, metal working, coatings, water treatment, paint, mining, oil and gas, and janitorial and other applications. This segment also provides contract manufacturing services, as well as operates as a multi-purpose plant to process various difficult to handle materials, including flammable solvents, viscous liquids, and granular solids. The company was formerly known as Blackman Uhler Industries, Inc. and changed its name to Synalloy Corporation in July 1967. Synalloy Corporation was founded in 1945 and is headquartered in Oak Brook, Illinois.