UNITED STATES

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 10-K/A

Amendment No. 1

SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended June 30, 2013

OR

SECURITIES EXCHANGE ACT OF 1934

For the transition period from ___ to ___

Commission file number 001-35023

iBio, Inc.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (302) 355-0650

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

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ¨ No x

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes ¨ No x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes x No ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes x No ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act:

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ¨ No x

The aggregate market value of the voting and non-voting common equity held by non-affiliates of the registrant was approximately $18,250,000 as of December 31, 2012, based upon the closing sale price on the NYSE MKT of $0.62 per share reported for such date.

There were 56,692,095 shares of the registrant’s common stock issued and outstanding as of September 10, 2013.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive proxy statement for its 2013 Annual Meeting of Stockholders, to be filed with the Commission not later than 120 days after the close of the registrant’s fiscal year, are incorporated by reference, in whole or in part, into Part III, Items 10, 11, 12, 13 and 14 of this Annual Report on Form 10-K.

EXPLANATORY NOTE

iBio, Inc. (the “Company”) is filing this Amendment No. 1 (this “Form 10-K/A”) to the Company’s Annual Report on Form 10-K for the year ended June 30, 2013, filed with the Securities and Exchange Commission (“SEC”) on September 30, 2013 (the “Form 10-K”), for the sole purpose of furnishing a revised XBRL file which improves the accuracy of the data tags selected in accordance with the 2013 U.S. GAAP Financial Reporting Taxonomy.

No other changes have been made to the Form 10-K. This Form 10-K/A speaks as of the original date of the Form 10-K, does not reflect events that may have occurred subsequent to the original filing date, and does not modify or update in any way disclosures made in the Form 10-K.

PART IV

Item 15. Exhibits and Financial Statement Schedules.

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.