X0306 4/A 2021-06-11 2021-06-15 0001744494 ADVENT TECHNOLOGIES HOLDINGS, INC. ADN 0001843793 Gregoriou Vassilios C/O ADVENT TECHNOLOGIES HOLDINGS, INC. 200 CLARENDON STREET BOSTON MA 02116 true true true Chairman and CEO Common Stock 2021-06-11 2021-02-04 4 A 0 922118 0 A 6387624 D Stock Options 922118 2021-06-11 2021-02-04 4 A 0 922118 10.36 A 2022-02-04 2031-06-11 Common Stock 922118 922118 D This amended Form 4 is being filed only to report that the reporting holder is also a 10% holder. No changes to the originally filed Form 4 are otherwise being reported on this amended Form 4. The line item in Table I is included only to include this footnote in order to gain access to the SEC's filing system. Received pursuant to the Advent Technologies Holdings, Inc. 2021 Equity Incentive Plan, dated as of February 4, 2021. The options will vest 25% upon each anniversary of February 4, 2021, the vesting commencement date, until the fourth anniversary of the vesting commencement date. Received pursuant to the Advent Technologies Holdings, Inc. 2021 Equity Incentive Plan, dated as of February 4, 2021. The restricted stock units will vest 25% upon each anniversary of February 4, 2021, the vesting commencement date, until the fourth anniversary of the vesting commencement date. See Exhibit 24 - Power of Attorney /s/ Vassilios Gregoriou 2021-06-15