About Advent Technologies Holdings, Inc. Advent Technologies Holdings, Inc. is a U.S. corporation that develops, manufactures, and assembles complete fuel cell systems, and the 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. With more than 100 patents issued for its fuel cell technology, Advent holds the IP for next-generation HT-PEM that enable various fuels to function at high temperatures under extreme conditions – offering a flexible “Any Fuel. Anywhere.” option for the automotive, aviation, defense, oil and gas, marine, and power generation sectors.