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): July 15, 2013

SMITHFIELD FOODS, INC.

(Exact Name of Registrant as Specified in its Charter)

Virginia

(State or Other Jurisdiction

of Incorporation)

(757) 365-3000

(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 (see General Instruction A.2. below):

Smithfield Foods, Inc. (the “Company”) is disclosing under Item 7.01 of this Current Report on Form 8-K the information attached to this report as Exhibit 99.1, which information is incorporated herein by reference. This information, some of which has not been previously reported, is excerpted from a Confidential Preliminary Offering Memorandum that is being disseminated in connection with the proposed notes offering described in Item 8.01 below.

As provided in General Instruction B.2 of Form 8-K, the information included under this Item, including Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, nor shall it be deemed to be incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), except as shall be expressly set forth by specific reference in such a filing.

On July 15, 2013, the Company issued a press release announcing a senior unsecured notes offering by Sun Merger Sub, Inc. (“Merger Sub”) in connection with the previously announced contemplated merger of the Company with Merger Sub. The press release is attached as Exhibit 99.2 and is incorporated herein by reference.

The notes will be offered and sold to qualified institutional buyers in the United States pursuant to Rule 144A and outside the United States pursuant to Regulation S under the Securities Act. The information contained in this report does not constitute an offer to sell or the solicitation of an offer to buy notes in any jurisdiction in which such an offer or sale would be unlawful.

Forward-Looking Statements

This filing contains “forward-looking” statements within the meaning of the federal securities laws. The forward-looking statements include statements concerning the Company’s outlook for the future, as well as other statements of beliefs, future plans and strategies or anticipated events, and similar expressions concerning matters that are not historical facts. The Company’s forward-looking information and statements are subject to risks and uncertainties that could cause actual results to differ materially from those expressed in, or implied by, the forward-looking statements. These risks and uncertainties include, but are not limited to the occurrence of any event, change or other circumstances that could give rise to the termination of the merger agreement; the failure to receive, on a timely basis or otherwise, approval of the merger proposal by the Company’s shareholders or the approval of government or regulatory agencies with regard to the merger; the failure of one or more conditions to the closing of the merger agreement to be satisfied; the failure of Shuanghui International Holdings Limited to obtain the necessary financing in connection with the merger agreement; the amount of the costs, fees, expenses and charges related to the merger agreement or merger; risks arising from the merger’s diversion of management’s attention from the Company’s ongoing business operations; risks that the Company’s stock price may decline significantly if the merger is not completed; the ability of the Company to retain and hire key personnel and maintain relationships with customers, suppliers and other business partners pending the completion of the merger; the availability and prices of live hogs, feed ingredients (including corn), raw materials, fuel and supplies; food safety; livestock disease; live hog production costs; product pricing; the competitive environment and related market conditions; risks associated with the Company’s indebtedness, including cost increases due to rising interest rates or changes in debt ratings or outlook; hedging risk; adverse weather conditions; operating efficiencies; changes in foreign currency exchange rates; access to capital; the cost of compliance with and changes to regulations and laws, including changes in accounting standards, tax laws, environmental laws, agricultural laws and occupational, health

and safety laws; adverse results from litigation; actions of domestic and foreign governments; labor relations issues; credit exposure to large customers; the ability to make effective acquisitions and successfully integrate newly acquired businesses into existing operations, and other risks and uncertainties described under Part I, Item 1A. “Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended April 28, 2013. Readers are cautioned not to place undue reliance on forward-looking statements because actual results may differ materially from those expressed in, or implied by, the forward-looking statements. Any forward-looking statement that the Company makes speaks only as of the date of such statement, and the Company undertakes no obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise. Comparisons of results for current and any prior periods are not intended to express any future trends or indications of future performance, unless expressed as such, and should only be viewed as historical data.

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.

EXHIBIT INDEX