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): December 4, 2012

TPC Group LLC

(Exact name of Registrant as specified in its charter)

5151 San Felipe, Suite 800, Houston, Texas 77056

(Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (713) 627-7474

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:

TPC Group LLC, a Delaware limited liability company (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 dated December 4, 2012 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 in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such a filing.

On December 3, 2012, TPC Group Inc. (“TPC Group”) issued a press release announcing that TPC Group intends, subject to market and other conditions, to commence an offering of senior secured notes in connection with the proposed acquisition of TPC Group by entities affiliated with First Reserve Management, L.P. and SK Capital Partners. A copy of the press release is attached hereto as Exhibit 99.2 and is incorporated herein by reference.

Forward-Looking Statements

This filing contains forward-looking statements, which are subject to risks, uncertainties, assumptions and other factors that are difficult to predict and that could cause actual results to vary materially from those expressed in or indicated by them. Many of the factors that will determine the outcome of the subject matter of this filing are beyond the ability of the Company to control or predict. The Company can give no assurance that the conditions to the merger will be satisfied or that the merger or the offering of the notes described herein will be consummated. Except as required by law, the Company undertakes no obligation to revise or update any forward-looking statement, or to make any other forward-looking statements, whether as a result of new information, future events or otherwise. The Company is not responsible for updating the information contained in this communication beyond the published date, or for changes made to this communication by wire services or Internet service providers.

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, 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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