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Received pursuant to the Plan. The options will vest 25% upon each anniversary of February 15, 2024, the vesting commencement date, until the fourth anniversary of the vesting commencement date on February 15, 2028.

Restricted stock units ("RSUs") representing a contingent right to receive common stock, granted pursuant to Issuer's 2021 Equity Incentive Plan, dated February 4, 2021 (the "Plan").

RSUs are a common stock equivalent that may be settled solely by delivery of an equal number of shares of Issuer's common stock. They vest 25% on each anniversary of the grant date and will be fully vested on February 15, 2028.

Shares automatically sold solely to satisfy income tax and withholding and remittance obligations in connection with the vesting of RSUs.

Shares automatically sold solely to satisfy income tax and withholding and remittance obligations in connection with the vesting of RSUs.

Aggregate number of shares sold on the same date at different prices. Such shares were sold by the Reporting Person solely to satisfy income tax and withholding and remittance obligations in connection with the vesting of Restricted Stock Units.

Represents the weighted average sale price. The shares were sold in multiple transactions at prices ranging from $1.90655 to $1.945296, inclusive. Reporting Person undertakes to provide to Issuer, any security holder of Issuer, or the Staff, upon request, full information regarding the number of shares sold at each separate price within the range set forth herein.

Aggregate number of shares sold on the same date at different prices. Shares sold by Reporting Person solely to satisfy income tax and withholding and remittance obligations in connection with the vesting and net settlement of Restricted Stock Units.

Represents the weighted average sale price. The shares were sold in multiple transactions at prices ranging from $1.90655 to $1.945296, inclusive. Reporting Person undertakes to provide to Issuer, any security holder of Issuer, or the Staff, upon request, full information regarding the number of shares sold at each separate price within the range set forth herein.

Aggregate number of shares sold on the same date at different prices. Shares sold by Reporting Person solely to satisfy income tax and withholding and remittance obligations in connection with the vesting and net settlement of Restricted Stock Units.

Weighted average sale price. The shares were sold in multiple transactions at prices ranging from $1.90655 to $1.945296, inclusive. Reporting Person undertakes to provide to Issuer, any security holder of Issuer, or the Staff, upon request, full information regarding the number of shares sold at each separate price within the range set forth herein.

Aggregate number of shares sold on the same date at different prices. Shares sold by Reporting Person solely to satisfy income tax and withholding and remittance obligations in connection with the vesting and net settlement of Restricted Stock Units.

Weighted average sale price. The shares were sold in multiple transactions at prices ranging from $1.93497 to $1.99499, inclusive. Reporting Person undertakes to provide to Issuer, any security holder of Issuer, or the Staff, upon request, full information regarding the number of shares sold at each separate price within the range set forth herein.

Aggregate number of shares sold on the same date at different prices. Such shares were sold by the Reporting Person solely to satisfy income tax and withholding and remittance obligations in connection with the vesting of Restricted Stock Units.

Represents the weighted average sale price. The shares were sold in multiple transactions at prices ranging from $1.93497 to $1.99499, inclusive. Reporting Person undertakes to provide to Issuer, any security holder of Issuer, or the Staff, upon request, full information regarding the number of shares sold at each separate price within the range set forth herein.

Aggregate number of shares sold on the same date at different prices. Shares sold by Reporting Person solely to satisfy income tax and withholding and remittance obligations in connection with the vesting and net settlement of Restricted Stock Units.

Represents the weighted average sale price. The shares were sold in multiple transactions at prices ranging from $1.93497 to $1.99499, inclusive. Reporting Person undertakes to provide to Issuer, any security holder of Issuer, or the Staff, upon request, full information regarding the number of shares sold at each separate price within the range set forth herein.

Aggregate number of shares sold on the same date at different prices. Shares sold by Reporting Person solely to satisfy income tax and withholding and remittance obligations in connection with the vesting and net settlement of Restricted Stock Units.

Weighted average sale price. The shares were sold in multiple transactions at prices ranging from $1.974963 to $2.05, inclusive. Reporting Person undertakes to provide to Issuer, any security holder of Issuer, or the staff of the Securities and Exchange Commission (the "Staff"), upon request, full information regarding the number of shares sold at each separate price within the range set forth herein.

Aggregate number of shares sold on the same date at different prices. Such shares were sold by the Reporting Person solely to satisfy income tax and withholding and remittance obligations in connection with the vesting of Restricted Stock Units.

Represents the weighted average sale price. The shares were sold in multiple transactions at prices ranging from $1.974963 to $2.05, inclusive. Reporting Person undertakes to provide to Issuer, any security holder of Issuer, or the staff of the Securities and Exchange Commission (the "Staff"), upon request, full information regarding the number of shares sold at each separate price within the range set forth herein.

Aggregate number of shares sold on the same date at different prices. Shares sold by Reporting Person solely to satisfy income tax and withholding and remittance obligations in connection with the vesting and net settlement of Restricted Stock Units.

Represents the weighted average sale price. The shares were sold in multiple transactions at prices ranging from $1.974963 to $2.05, inclusive. Reporting Person undertakes to provide to Issuer, any security holder of Issuer, or the staff of the Securities and Exchange Commission (the "Staff"), upon request, full information regarding the number of shares sold at each separate price within the range set forth herein.

Grant of fully vested restricted stock units ("RSUs") pursuant to Issuer's 2021 Equity Incentive Plan. The RSUs represent a contingent right to receive common stock of Issuer upon vesting.

Reporting Person previously filed a Form 4 on September 6, 2022, reporting that these shares were withheld by Issuer for tax purposes upon vesting of RSUs. Such shares were erroneously withheld.

Forfeiture of shares upon vesting of restricted stock units ("RSUs") on August 31, 2022. The RSUs were granted August 31, 2021, pursuant to Issuer's 2021 Equity Incentive Plan, dated February 4, 2021. Such RSUs are a common stock equivalent that may be settled solely by delivery of an equal number of shares of Issuer's common stock.

Represents shares that have been withheld by the Issuer to satisfy income tax and withholding and remittance obligations in connection with the net settlement of RSUs and does not represent a sale by the Reporting Person.

Represents shares that have been withheld by the Issuer to satisfy income tax and withholding and remittance obligations in connection with the net settlement of RSUs and does not represent a sale by the Reporting Person.

Restricted stock units ("RSUs"), representing a contingent right to receive common stock, granted pursuant to Issuer's 2021 Equity Incentive Plan, dated February 4, 2021 (the "Plan").

RSUs are a common stock equivalent that may be settled solely by delivery of an equal number of shares of Issuer's common stock. They vest 25% over four years on each anniversary of the grant date and will be fully vested on July 12, 2026.

Employee stock options (right to buy) ("Options") granted pursuant to the Plan.

Options vest 25% over four years on each anniversary of the grant date and will be fully vested as of July 12, 2026.

Restricted stock units ("RSUs") granted pursuant to Issuer's 2021 Equity Incentive Plan as part of Reporting Person's compensation for service as a director of Issuer. The RSUs represent a contingent right to receive common stock of Issuer upon vesting. The RSUs vest 100% on either June 8, 2023, which is the first anniversary of the vesting commencement date, or as of the 2023 annual meeting of stockholders of Issuer, whichever is earlier.

Restricted stock units ("RSUs") granted pursuant to Issuer's 2021 Equity Incentive Plan as part of Reporting Person's compensation for service as a director of Issuer. The RSUs represent a contingent right to receive common stock of Issuer upon vesting. The RSUs vest 100% on either June 8, 2023, which is the first anniversary of the vesting commencement date, or as of the 2023 annual meeting of stockholders of Issuer, whichever is earlier.

Restricted stock units ("RSUs") granted pursuant to Issuer's 2021 Equity Incentive Plan as part of Reporting Person's compensation for service as a director of Issuer. The RSUs represent a contingent right to receive common stock of Issuer upon vesting. The RSUs vest 100% on either June 8, 2023, which is the first anniversary of the vesting commencement date, or as of the 2023 annual meeting of stockholders of Issuer, whichever is earlier.

Represents shares that have been withheld by the Issuer to satisfy income tax and withholding and remittance obligations in connection with the net settlement of RSUs and does not represent a sale by the Reporting Person.

Represents shares that have been withheld by the Issuer to satisfy income tax and withholding and remittance obligations in connection with the net settlement of RSUs and does not represent a sale by the Reporting Person.

Represents shares that have been withheld by the Issuer to satisfy income tax and withholding and remittance obligations in connection with the net settlement of RSUs and does not represent a sale by the Reporting Person.

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 August 24, 2021, the vesting commencement date, until the fourth anniversary of the vesting commencement date.

Represents 230,529 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 August 24, 2021, the vesting commencement date, until the fourth anniversary of the vesting commencement date.

Represents 9,652 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 100% on the first anniversary of February 4, 2021, the vesting commencement date.

Represents 9,652 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 100% on the first anniversary of February 4, 2021, the vesting commencement date.

Represents 9,652 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 100% on the first anniversary of February 4, 2021, 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.

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.

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.

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.

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.

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.

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.

Represents 9,652 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 100% on the first anniversary of June 8, 2021, the vesting commencement date.

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.

Represents 9,652 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 100% on the first anniversary of June 8, 2021, the vesting commencement date.

Represents 9,652 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 100% on the first anniversary of February 4, 2021, the vesting commencement date.