144 0001949693 XXXXXXXX LIVE 0001787297 Passage BIO, Inc. 001-39231 ONE COMMERCE SQUARE 2005 MARKET STREET, 39TH FLOOR PHILADELPHIA PA 19103 2678660312 Chou William Officer Common Stock Maxim Group

300 Park Ave 16th Floor New York NY 10022

4076 75120.00 3178710 01/09/2026 NASDAQ Common Stock 01/15/2025 Restricted Stock Issuer N 10000 01/09/2026 Compensation Y The sale reported on this Form 144 represents an Issuer mandated sale by the Reporting Person to satisfy tax withholding obligations in connection with the vesting and settlement of RSU's, it does not represent a discretionary trade by the Reporting Person. 01/09/2026 /s/ Dominick Iadicicco, as a duly authorized representative of Maxim Group LLC., as attorney-in-fact for William Chou