X0609 4 2026-05-19 0001787297 Passage BIO, Inc. PASG 0001303811 Kassberg Thomas Richard false ONE COMMERCE SQUARE 2005 MARKET STREET, 39TH FLOOR PHILADELPHIA PA 19103 true false false false 0 Director Stock Option (right to buy) 5.08 2026-05-19 4 A 0 10539 0 A 2036-05-19 Common Stock 10539 10539 D The stock option vests in full on the earlier of: (i) the one year anniversary of the grant date or (ii) the date of the issuer's 2027 Annual Meeting of its stockholders, subject to the reporting person's continuous service to the issuer on such date. /s/ Kathleen Borthwick, Attorney-in-Fact 2026-05-21