Advent Technologies Holdings, Inc. is an advanced materials and technology development company operating in the fuel cell and hydrogen technology space. The Company develops, manufactures, and assembles complete fuel cell systems and the critical components that determine the performance of hydrogen fuel cells and other energy systems. Its product offerings include full fuel cell systems and the membrane electrode assembly (MEA) at the center of the fuel cell. It is a provider of fuel cell systems, high-temperature proton exchange membranes (HT-PEMs), fuel cells, and HT-PEM-based MEAs, which are critical components used in fuel cells, and other electrochemical applications such as electrolyzers and flow batteries. The Company also develops and manufactures MEAs, and designs fuel cell stacks and complete fuel cell systems for a range of customers in the stationary power, portable power, automotive, aviation, energy storage and sensor markets.