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): May 30, 2013

GRAPHIC PACKAGING HOLDING COMPANY

(Exact name of registrant as specified in its charter)

1500 Riveredge Parkway, Suite 100

Atlanta, Georgia 30328

(Address of principal executive offices)

(770) 644-3000

(Registrant’s telephone number, including area code)

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 May 30, 2013, Graphic Packaging Holding Company (the “Company”) entered into an underwriting agreement (the “Underwriting Agreement”) with Merrill Lynch, Pierce, Fenner & Smith Incorporated and Citigroup Global Markets Inc. (collectively, the “Underwriters”), and certain selling stockholders named therein (the “Selling Stockholders”). Pursuant to the Underwriting Agreement, the Selling Stockholders agreed to sell to the Underwriters 15,000,000 shares of the Company’s common stock, $0.01 par value per share (“Common Stock”), at a price of $7.73 per share. The Underwriting Agreement contains customary representations, warranties, and covenants of the Company and also provides for customary indemnification by each of the Company, the Selling Stockholders, and the Underwriters against certain liabilities and customary contribution provisions in respect of those liabilities.

The sale of the Common Stock by the Selling Stockholders was made pursuant to the Company’s Registration Statement on Form S-3 (Registration No. 333-176606), including a prospectus supplement dated May 31, 2013 to the prospectus contained therein dated August 31, 2011, filed by the Company with the Securities and Exchange Commission pursuant to Rule 424(b)(7) under the Securities Act of 1933, as amended. The sale of the Common Stock closed on June 5, 2013.

Following the sale by the Selling Stockholders of the Common Stock in the public offering, the Selling Stockholders will continue to own 136,520,562 shares of Common Stock, or approximately 39.2% of the Company’s outstanding Common Stock.

The foregoing description of the Underwriting Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the Underwriting Agreement, which is attached as Exhibit 1.1 to this Current Report on Form 8-K and incorporated by reference into this Item 1.01.

- 2 -

SIGNATURE

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.

- 3 -