X0407 4/A 2021-06-11 2021-06-15 0 0001744494 ADVENT TECHNOLOGIES HOLDINGS, INC. ADN 0001512086 Kaskavelis Christos 500 RUTHERFORD AVENUE SUITE 102 BOSTON MA 02129 0 1 0 0 CMO 0 Common Stock 2021-06-11 2021-02-04 4 A 0 345794 0.00 A 2247502 D Common Stock 1802405 I By Nemaland Ltd. 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 Issuer's common stock beneficially owned through Nemaland Ltd. This Form 4A amends and restates Table I of the Form 4 filed June 15, 2021, which inadvertently incorrectly stated the Reporting Person's aggregate shares of common stock owned directly and indirectly following the grant reported on such Form 4. /s/ Christos Kaskavelis 2023-04-14