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): February 27, 2015

Penford Corporation

(Exact name of registrant as specified in its charter)

303-649-1900

(Registrant’s telephone number, including area code)

Not Applicable

(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:

On February 27, 2015, Penford Corporation (the “Company”) discovered an inadvertent posting of a website link prepared in anticipation of the closing of its pending acquisition by Ingredion Incorporated pursuant to that certain Agreement and Plan of Merger, dated as of October 14, 2014, by and among the Company, Ingredion Incorporated, a Delaware corporation, and Prospect Sub, Inc., a Washington corporation and a wholly-owned subsidiary of Ingredion Incorporated, which provides that Prospect Sub, Inc. will merge with and into the Company, with the Company continuing as the surviving corporation (the “Merger”). The link implied that the Merger had closed. The Merger has not yet closed. The Company continues to expect the Merger to close in the first quarter of 2015, pending regulatory approval. The link was promptly removed after the Company became aware of the inadvertent posting.

Forward-Looking Statements

Statements made in this current report on Form 8-K and related statements that express the Company’s or its management’s intentions, hopes, indications, beliefs, expectations, or predictions of the future, constitute forward-looking statements as defined by the Private Securities Litigation Reform Act of 1995, and relate to matters that are not historical facts. These statements include those regarding the closing of the Merger and the expected timing of the Merger.

These statements are not guarantees of future performance or events and are subject to risks, uncertainties and assumptions that could cause actual results or events to vary materially from those indicated in this current report on Form 8-K, including the ability to obtain regulatory approvals of the Merger on the proposed terms and schedule, and other factors described in the Company’s reports filed with the SEC, including our annual report for the year ended August 31, 2014 and subsequent quarterly reports, filed with the SEC, which risks and uncertainties are incorporated herein by reference. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this current report on Form 8-K. Except to the extent required by law, the Company disclaims any obligation to update any forward-looking statements after the distribution of this current report on Form 8-K, whether as a result of new information, future events, changes in assumptions or otherwise.

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.