Their presence was a testament to the importance of the clean energy industry in Massachusetts and the potential of hydrogen technology. On behalf of the entire Advent team, I would like to thank them for their support and encouragement as we strive to become a leader in the electrochemistry components industry and help accelerate the global transition to a net-zero carbon future." About Advent Technologies Holdings, Inc. Advent Technologies Holdings, Inc. is a U.S. corporation that develops, manufactures, and assembles complete fuel cell systems as well as supplying customers with critical components for fuel cells in the renewable energy sector. Advent is headquartered in Boston, Massachusetts, with offices in California, Greece, Denmark, Germany, and the Philippines.