William Chou - 16 Mar 2026 Form 4 Insider Report for Passage BIO, Inc. (PASG)

Role: PRESIDENT AND CEO, Director
Signature: /s/ Kathleen Borthwick, Attorney-in-Fact
Issuer symbol: PASG
Transactions as of: 16 Mar 2026
Net transactions value: $0
Form type: 4
Filing time: 18 Mar 2026, 16:06:33 UTC
Previous filing: 12 Jan 2026
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/ Kathleen Borthwick, Attorney-in-Fact	18 Mar 2026	0001949693

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	Employee Stock Option (right to buy)	Award		+58,000		$0.000000^*	58,000	16 Mar 2026	Common Stock	58,000	$7.64	Direct	F1

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

Explanation of Responses:

Id	Content
F1	The stock option vests as to 1/48 of the total shares monthly beginning on April 16, 2026 until fully vested, subject to the Reporting Person's provision of service to the Issuer on each vesting date.