X0306 4 2021-06-11 0001744494 ADVENT TECHNOLOGIES HOLDINGS, INC. ADN 0001512086 Kaskavelis Christos C/O ADVENT TECHNOLOGIES HOLDINGS, INC. 200 CLARENDON STREET BOSTON MA 02116 true Chief Marketing Officer Common Stock 2021-06-11 2021-02-04 4 A 0 345794 0 A 4049907 D Common Stock 3704113 I By Nemaland Ltd. Stock Options 10.36 2021-06-11 2021-02-04 4 A 0 345794 0 A 2022-02-04 2031-06-11 Common Stock 345794 345794 D Represents 345,794 restricted stock units that is a contingent right to receive common stock upon vesting granted 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. Reflects shares of the Company's common stock beneficially owned through Nemaland Ltd. 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. See Exhibit 24 - Power of Attorney By: /s/ Christos Kaskavelis 2021-06-15