LIVERMORE, Calif., Sept. 29, 2025 (GLOBE NEWSWIRE) -- (NASDAQ: ADN) Advent Technologies Holdings, Inc., through its wholly owned subsidiary, Advent Technologies, SA, is pleased to announce a new contract with Siqens GmbH, a leading German fuel cell system manufacturer. Under the terms of the 12-month contract, Advent will supply Membrane Electrode Assemblies (“MEAs”) for integration into Siqens’ innovative fuel cell systems. This marks a significant milestone in Advent’s ongoing mission to expand the adopti ...