U.S. 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): January 4, 2018

iBio, Inc.

(Exact name of registrant as specified in its charter)

Delaware

(State or jurisdiction of incorporation or organization)

001-35023

(Commission File Number)

26-2797813

(I.R.S. Employer Identification Number)

600 Madison Avenue, Suite 1601, New York, NY 10022-1737

(Address of principal executive offices (Zip Code)

Registrant’s telephone number: (302) 355-0650

N/A

(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 (17CFR 240.14d-2(b))

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

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).

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.

¨ Emerging growth company

On January 4, 2018, iBio, Inc. (the “Company”) received notification from the NYSE AMERICAN LLC (“NYSE American”) pursuant to Section 1003(f)(v) of the NYSE American’s Company Guide that, due to the Company’s current low selling share price, the Company’s continued listing on the NYSE American is predicated on the Company effecting a reverse stock split or otherwise demonstrating sustained improvement in its share price within a reasonable period of time, which the NYSE American has determined to be no later than July 5, 2018.

The Company’s common stock will continue to be listed on the NYSE American while it attempts to regain compliance with the listing standards noted, subject to the Company’s compliance with other continued listing requirements. The Company’s common stock will continue to trade under the symbol “IBIO,” but will have an added designation of “.BC” to indicate that the Company is not in compliance with the NYSE American’s listing standards.

The NYSE American notification does not affect the Company’s business operations or its reporting obligations under the Securities and Exchange Commission regulations and rules and does not conflict with or cause an event of default under any of the Company’s material agreements.

The Company issued a press release on the same day of this report announcing that it had received the notification from NYSE American. A copy of the press release is attached hereto as Exhibit 99.1.

*Filed herewith.

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.