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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.

A2A S.p.A. engages in the production, sale, and distribution of gas and electricity, and district heating in Italy and internationally. The company generates electricity through hydroelectric, thermoelectric, photovoltaic, cogeneration, biomass, and wind plants; and sells and distributes gas. It also engages in the production and sale of heat produced through district heating networks; waste management activities, including collection and street sweeping, treatment, disposal, and recovery of materials and energy; and the construction and management of integrated waste disposal plants and systems. In addition, the company offers integrated water cycle management services; and technical consultancy services relating to energy efficiency certificates. Further, it is involved in the management of public lighting systems and street lights, and water purification and sewer activities, as well as offers garbage collection, street sweeping, video surveillance, energy efficiency, and electric mobility services. A2A S.p.A. is headquartered in Milan, Italy.

Deutsche Telekom AG, together with its subsidiaries, provides integrated telecommunication services. The company operates through Germany, United States, Europe, Systems Solutions, Group Development, and Group Headquarters and Group Services segments. It offers fixed-network services, including voice and data communication services based on fixed-network and broadband technology; and sells terminal equipment and other hardware products, as well as services to resellers. In addition, the company provides mobile voice and data services to consumers and business customers; sells mobile devices and other hardware products; and sells mobile services to resellers and to companies that purchases and markets network services to third parties, such as mobile virtual network operators. Further, it offers internet services; internet-based TV products and services; and information and communication technology systems for multinational corporations and public sector institutions with an infrastructure of data centers and network services. Additionally, the company provides wireless communications services; and cloud services, digital solutions, security, and advisory solutions. Deutsche Telekom AG has mobile customers and broadband customers, as well as fixed-network lines. The company was incorporated in 1995 and is headquartered in Bonn, Germany.

Hellenic Telecommunications Organization S.A. provides telecommunications and related services to businesses and individuals primarily in Greece and Romania. It operates through OTE, COSMOTE Group, and Telekom Romania Mobile segments. The company offers fixed-line, Internet access, ICT, and TV production services; and international carrier services. It also provides mobile and satellite telecommunication, electronic money, e-commerce, financing, consultancy and security, real estate, insurance brokerage, training, wholesale telephony, retail, marketing, overdue accounts management, wholesale broadband, and infrastructure services. Hellenic Telecommunications Organization S.A. was incorporated in 1949 and is based in Athens, Greece. Hellenic Telecommunications Organization S.A. operates as a subsidiary of Deutsche Telekom AG.