Advent Technologies Holdings, Inc., an advanced materials and technology development company, operates in the fuel cell and hydrogen technology markets. It develops, manufactures, and assembles the critical components that determine the performance of hydrogen fuel cells and other energy systems. The company offers HT-PEM (high-temperature proton exchange membrane) fuel cells, HT-PEM based membrane electrode assemblies, flow battery membranes, organic photovoltaics, and ultracells. It serves stationary power, portable power, automotive, aviation, energy storage, and sensor markets. The company was founded in 2006 and is headquartered in Boston, Massachusetts.