Sec Form 4 Filing - Gregoriou Vassilios @ ADVENT TECHNOLOGIES HOLDINGS, INC. - 2022-07-12

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Gregoriou Vassilios 2. Issuer Name and Ticker or Trading Symbol ADVENT TECHNOLOGIES HOLDINGS, INC. [ ADN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner X __ Officer (give title below) _____ Other (specify below) CEO, Chair (Last) (First) (Middle) 200 CLARENDON STREET, 25TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 07/12/2022 (Street) BOSTON, MA02116 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock( 1 ) 07/12/2022 A 175,000( 2 ) A $ 0 6,562,624 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Employee Stock Options (right to buy)( 3 ) $ 2.74 07/12/2022 A 175,000 07/12/2023( 4 ) 07/12/2032 Common Stock 175,000 $ 0 175,000 D Employee Stock Options (right to buy) $ 10.36 02/04/2022 06/11/2021 Common Stock 922,118 922,118 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Gregoriou Vassilios 200 CLARENDON STREET 25TH FLOOR BOSTON, MA02116 X X CEO, Chair Signatures /s/ Vassilios Gregoriou 07/15/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )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"). ( 2 )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. ( 3 )Employee stock options (right to buy) ("Options") granted pursuant to the Plan. ( 4 )Options vest 25% over four years on each anniversary of the grant date and will be fully vested as of July 12, 2026.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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