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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): November 4, 2025

iBio, Inc.

(Exact name of registrant as specified in charter)

Delaware

(State or other jurisdiction of incorporation)

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11750 Sorrento Valley Road, Suite 200

San Diego, California 92121

(Address of principal executive offices and zip code)

(979) 446-0027

(Registrant’s telephone number including area code)

N/A

(Former Name and Former Address)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of registrant under any of the following provisions:

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

☐   Soliciting material pursuant to Rule 14a-12(b) 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:

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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 checkmark 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. ¨

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Item 8.01     Other Events.

On November 4, 2025, iBio, Inc. (the “Company”) received notice from the Listing Qualifications Department of The Nasdaq Stock Market LLC (“Nasdaq”) noting it has regained compliance with Nasdaq Lising Rule 5550(a)(2). As previously reported, on July 29, 2025, the Company received a letter from Nasdaq indicating the Company was not in compliance with the Nasdaq Listing Rule 5550(a)(2) because the Company’s common stock failed to maintain a minimum closing bid price of $1.00 per share over the previous 30 consecutive business days (June 13, 2025 to July 28, 2025), as required by Nasdaq Listing Rule 5550(a)(2). The matter is now closed.

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SIGNATURES

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

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