Advent Technologies Holdings, Inc. is an advanced materials and technology development company operating in the fuel cell and hydrogen technology markets in North America and Europe. It develops, manufactures, and assembles fuel cell systems and critical components that determine the performance of hydrogen fuel cells and other energy systems. Its offerings include high temperature proton exchange membrane (HT-PEM) fuel cells, electrodes for fuel cell and energy storage applications, and membrane electrode assemblies (MEA). The company also designs fuel cell stacks and complete fuel cell systems for stationary power, portable power, automotive, aviation, energy storage, and sensor markets. It is headquartered in Livermore, California.