SEC Form DEFA14A filed by Bellerophon Therapeutics Inc.

1UPX Using a black ink pen, mark your votes with an X as shown in this example. Please do not write outside the designated areas. 03WCDB + + Please sign exactly as name(s) appears hereon. Joint owners should each sign. When signing as attorney, executor, administrator, corporate officer, trustee, guardian, or custodian, please give full title. Date (mm/dd/yyyy) — Please print date below. Signature 1 — Please keep signature within the box. Signature 2 — Please keep signature within the box. B Authorized Signatures — This section must be completed for your vote to count. Please date and sign below. q IF VOTING BY MAIL, SIGN, DETACH AND RETURN THE BOTTOM PORTION IN THE ENCLOSED ENVELOPE. q 2024 Special Meeting Proxy Card A Proposals — The Board of Directors recommends a vote FOR Proposals 1 and 2. 1. The approval of the liquidation and dissolution of Bellerophon Therapeutics, Inc. (the “Company”) and the Plan of Liquidation and Dissolution (the “Plan of Dissolution”), which, if approved, will authorize the Company’s Board of Directors to liquidate and dissolve the Company in accordance with the Plan of Dissolution (the “Dissolution Proposal”); and 2. The approval of an adjournment of the Special Meeting, if necessary, to solicit additional proxies if there are not sufficient votes at the time of the Special Meeting to approve the Dissolution Proposal (the “Adjournment Proposal”). For Against Abstain For Against Abstain 1234 5678 9012 345 MMMMMMMMM 604848 MR A SAMPLE (THIS AREA IS SET UP TO ACCOMMODATE 140 CHARACTERS) MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND C 1234567890 J N T MMMMMMMMMMMM MMMMMMM If no electronic voting, delete QR code and control # Δ ≈ 000001MR A SAMPLE DESIGNATION (IF ANY) ADD 1 ADD 2 ADD 3 ADD 4 ADD 5 ADD 6 ENDORSEMENT_LINE______________ SACKPACK_____________ MMMMMMMMMMMMMMM C123456789 000000000.000000 ext 000000000.000000 ext 000000000.000000 ext 000000000.000000 ext 000000000.000000 ext 000000000.000000 ext You may vote online or by phone instead of mailing this card. Online Go to www.envisionreports.com/BLPH or scan the QR code — login details are located in the shaded bar below. Save paper, time and money! Sign up for electronic delivery at www.envisionreports.com/BLPH Phone Call toll free 1-800-652-VOTE (8683) within the USA, US territories and Canada Votes submitted electronically must be received by 1:00 A.M., Eastern Time, on March 1, 2024. Your vote matters – here’s how to vote!

Small steps make an impact. Help the environment by consenting to receive electronic delivery, sign up at www.envisionreports.com/BLPH Notice of 2024 Special Meeting of Shareholders Proxy Solicited by Board of Directors for Special Meeting — March 1, 2024 Naseem Amin and Fred Hanuschek, or any of them, each with the power of substitution, are hereby authorized to represent and vote the shares of the undersigned, with all the powers which the undersigned would possess if personally present, at the Special Meeting of Shareholders of Bellerophon Therapeutics, Inc. to be held on March 1, 2024 or at any postponement or adjournment thereof. Shares represented by this proxy will be voted by the shareholder. If no such directions are indicated, the Proxies will have authority to vote FOR items 1 and 2. In their discretion, the Proxies are authorized to vote upon such other business as may properly come before the meeting. (Items to be voted appear on reverse side) Bellerophon Therapeutics, Inc. q IF VOTING BY MAIL, SIGN, DETACH AND RETURN THE BOTTOM PORTION IN THE ENCLOSED ENVELOPE. q Change of Address — Please print your new address below. Comments — Please print your comments below. C Non-Voting Items + + Important notice regarding the Internet availability of proxy materials for the Special Meeting of Shareholders. The material is available at: www.envisionreports.com/BLPH 2024 Special Meeting Admission Ticket 2024 Special Meeting of Bellerophon Therapeutics, Inc. Shareholders Friday, March 1, 2024 at 11:00 AM Eastern Time Offices of Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C. 919 Third Avenue, New York, NY 10022 Upon arrival, please present this admission ticket and photo identification at the registration desk.