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

FibroBiologics, Inc.

(Exact name of Registrant as Specified in Its Charter)

(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:

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 ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

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

On August 4, 2025, FibroBiologics, Inc. (the “Company”) received a notification letter from the Listing Qualifications Staff (the "Staff") of The Nasdaq Stock Market LLC (“Nasdaq”) notifying the Company that it does not meet the requirement in Nasdaq Listing Rule 5550(b)(2) to maintain a minimum Market Value of Listed Securities (“MVLS”) of $35.0 million that is required for continued listing on The Nasdaq Capital Market (the “Notice”).

The Notice has no immediate impact on the listing of the Company’s common stock, which will continue to be listed and traded on The Nasdaq Capital Market subject to the Company’s continued compliance with the other listing requirements.

In accordance with Nasdaq Listing Rule 5810(c)(3)(C), the Company has a period of 180 calendar days, or until February 2, 2026, to regain compliance with this requirement. To regain compliance, the Company’s MVLS must close at $35.0 million or more for a minimum of ten consecutive business days at any time before February 2, 2026. If the Company does not regain compliance with Rule 5550(b)(2) by February 2, 2026, Nasdaq will notify the Company that its securities are subject to delisting. In the event of such notification, the Company may appeal the Staff’s determination to delist its securities, but there can be no assurance the Staff will grant the Company’s request for continued listing.

The Company will continue to monitor its MVLS and may, as appropriate, consider available options to regain compliance.

This Current Report on Form 8-K is filed to satisfy the obligation under Nasdaq Listing Rule 5810(b) and Item 3.01(a) of Form 8-K that the Company publicly disclose the receipt of the Notice within four (4) business days after the date of the Notice.

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.