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): April 1, 2014

PINNACLE ENTERTAINMENT, INC.

(Exact name of registrant as specified in its charter)

Registrant’s Telephone Number, including area code: (702) 541-7777

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:

As previously reported by Pinnacle Entertainment, Inc. (the “Company”) in a Current Report on Form 8–K filed on August 21, 2013, the Company and its subsidiaries, Casino Magic, LLC (“Holdings”), Casino One Corporation (“Target”), PNK (ES), LLC (“ES”), PNK (ST. LOUIS RE), LLC (“RE”) and PNK (STLH), LLC (“STLH”, and together with Target, ES and RE, the “Companies”) entered into an Equity Interest Purchase Agreement dated as of August 16, 2013 (the “Agreement”) with Tropicana St. Louis LLC, a Delaware limited liability company (“Buyer”) and a subsidiary of Tropicana Entertainment, Inc. (“Tropicana”), to sell its ownership interests in the Companies. The Companies own and operate the Lumiére Place Casino, the Four Seasons Hotel St. Louis and HoteLumiére and related excess land parcels in St. Louis, Missouri.

On April 1, 2014, the Company closed the sale of the equity interests in the Companies to the Buyer for cash consideration of approximately $263.3 million, subject to a net working capital adjustment. After paying certain expenses at closing, the Company used the proceeds at closing to repay approximately $260.3 million of term loans under its Amended and Restated Credit Agreement.

The foregoing description of the Agreement does not purport to be complete and is qualified in its entirety by reference to the Agreement, and the amendments thereto, which are attached as Exhibits 2.1, 2.2, 2.3 and 2.4 to this Current Report on Form 8-K and incorporated by reference.

On April 1, 2014, the Company issued a press release regarding the closing of the sale of the equity of the Companies. A copy of the press release is attached as Exhibit 99.1 to the Current Report on Form 8-K and is incorporated herein by reference.

(b)   Pro forma financial information

The unaudited pro forma condensed combined balance sheet as of December 31, 2013, the unaudited pro forma condensed combined statement of operations for the year ended December 31, 2013, and notes thereto, reflecting the Company’s disposition of the equity of the Companies are included as Exhibit 99.2 to this Current Report on Form 8–K and are incorporated herein by reference.

(d) Exhibits.

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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.

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EXHIBIT INDEX

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