William Chou - 08 Jan 2026 Form 4 Insider Report for Passage BIO, Inc. (PASG)

Role: PRESIDENT AND CEO, Director
Signature: /s/ William Chou
Issuer symbol: PASG
Transactions as of: 08 Jan 2026
Net transactions value: -$75,159
Form type: 4
Filing time: 12 Jan 2026, 16:03:52 UTC
Previous filing: 18 Mar 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Chou William	PRESIDENT AND CEO, Director	ONE COMMERCE SQUARE, 2005 MARKET STREET, 39TH FLOOR, PHILADELPHIA	/s/ William Chou	12 Jan 2026	0001949693

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	PASG	Common Stock	Options Exercise		+10,000	+1667%		10,600	08 Jan 2026	Direct	F1, F2
transaction	PASG	Common Stock	Sale	$75,159	-4,076	-38%	$18.44	6,524	08 Jan 2026	Direct	F3, F4

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	PASG	Restricted Stock Unit	Options Exercise	$0	-10,000	-50%	$0.000000	10,000	08 Jan 2026	Common Stock	10,000		Direct	F1, F5

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Restricted stock units ("RSUs") convert into common stock on a one-for-one basis.
F2	Includes 200 shares acquired on May 16, 2024, 200 shares acquired on May 15, 2025 and 200 shares acquired on November 15, 2025 under the 2020 Employee Stock Purchase Plan.
F3	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.
F4	The reported price in Column 4 is a weighted average price. These shares were sold as part of a block trade for multiple security holders of the Issuer in multiple transactions at prices ranging from $18.13 to $19.3061 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote 4 with regard to the block trade.
F5	50% of the total RSUs will vest on January 8, 2026 and the remaining 50% of the RSUs will vest on January 8, 2027, subject to the Reporting Person's provision of service to the Issuer on each vesting date.