UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): July 19, 2023

Bellerophon Therapeutics, Inc.

(Exact Name of Registrant as Specified in Charter)

Registrant’s telephone number, including area code: (908) 574-4770

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

¨ Emerging growth company

Item 3.01 Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing.

On July 19, 2023, Bellerophon Therapeutics, Inc. (the “Company”) was notified by the Listing Qualifications Department (the “Staff”) of The Nasdaq Stock Market LLC (“Nasdaq”) that in light of the Company’s previously disclosed workforce reduction plan and focus on exploring strategic alternatives, based upon the Staff’s belief that the Company is a “public shell” as that term is defined in Nasdaq Listing Rule 5101 and the Company’s non-compliance with the $1.00 bid price requirement set forth in Nasdaq Listing Rule 5550(a)(2), the Company would be delisted from The Nasdaq Capital Market at the opening of business on July 28, 2023 unless the Company timely requests a hearing before a Nasdaq Hearings Panel (the “Panel”) to address the deficiencies and present a plan to regain compliance.

The Company plans to timely request a hearing before the Panel, which request will stay any further delisting action by the Staff pending the ultimate outcome of the hearing and the expiration of any extension that may be granted by the Panel. The Company’s common stock will remain listed and eligible for trading on Nasdaq at least pending the ultimate conclusion of the hearing process.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.