Sec Form 4 Filing - Fotopoulos Alexandros @ Passage BIO, Inc. - 2022-11-22

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 Fotopoulos Alexandros 2. Issuer Name and Ticker or Trading Symbol Passage BIO, Inc. [ PASG] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Technical Officer (Last) (First) (Middle) ONE COMMERCE SQUARE, 2005 MARKET STREET, 39TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 11/22/2022 (Street) PHILADELPHIA, PA19103 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 11/22/2022 M 12,500 A $ 0( 1 ) 23,965( 2 ) D Common Stock 11/22/2022 S( 3 ) 3,720 D $ 1.33 20,245( 2 ) 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 Restricted Stock Units ( 1 ) 11/22/2022 M( 4 ) 12,500 ( 5 ) ( 6 ) Common Stock 12,500 $ 0 37,500 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Fotopoulos Alexandros ONE COMMERCE SQUARE 2005 MARKET STREET, 39TH FLOOR PHILADELPHIA, PA19103 Chief Technical Officer Signatures /s/ Edgar Cale, Attorney-in-Fact 11/25/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Restricted stock units ("RSUs") convert into common stock on a one-for-one basis. ( 2 )The reported total includes 3,082 shares of common stock the reporting person has acquired since the date of his last ownership report through the issuer's Employee Stock Purchase Plan in one or more transactions exempt pursuant to Rules 16b-3(c) and 16b-3(d). ( 3 )The sale reported on this Form 4 represents an Issuer mandated sale by the Reporting Person to satisfy tax withholding obligations in connection with the vesting and settlement of RSUs; it does not represent a discretionary trade by the Reporting Person. Pursuant to the Issuer's equity incentive plan, an award recipient's tax withholding obligations must be funded by a "sell to cover" transaction. ( 4 )The reported transaction represents the settlement of restricted stock units which vested on June 15, 2022 but for which settlement was delayed due to an inadvertent administrative error. ( 5 )1/4 of the RSUs vested on June 15, 2022, and the remainder will vest as to 1/4 of the total award in annual installments thereafter, subject to the Reporting Person's continued service to the Issuer on each vesting date. ( 6 )These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

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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