UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 14A

(Rule 14a-101)

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

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PASSAGE BIO, INC.

(Name of Registrant as Specified In Its Charter)

N/A

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Your Vote Counts! PASSAGE BIO, INC. 2021 Annual Meeting Vote by May 26, 2021 11:59 PM ET PASSAGE BIO, INC. ONE COMMERCE SQUARE 2005 MARKET STREET PHILADELPHIA, PA 19103 D41934-P53897 You invested in PASSAGE BIO, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the stockholder meeting to be held on May 27, 2021. Get informed before you vote View the Notice and Proxy Statement and 10K Wrap online OR you can receive a free paper or email copy of the material(s) by requesting prior to May 13, 2021. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. Smartphone users Point your camera here and vote without entering a control number Vote Virtually at the Meeting* May 27, 2021 4:30 PM, EDT Virtually at: www.virtualshareholdermeeting.com/PASG2021 *Please check the meeting materials for any special requirements for meeting attendance. V1 For complete information and to vote, visit www.ProxyVote.com Control #

Vote at www.ProxyVote.com THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. Board Recommends Voting Items D41935-P53897 Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Sign up for E-delivery”. 1. To elect three Class I directors, each to serve a three-year term through the third Annual Meeting of Stockholders following this meeting and until a successor has been elected and qualified or until earlier resignation or removal. Nominees: 01) Bruce A. Goldsmith, Ph.D. 02) Derrell D. Porter, M.D. 03) Tadataka Yamada, M.D. For 2. To ratify the appointment of KPMG LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2021. For 3. Any such other business as may properly come before the meeting or any adjournment thereof.