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 13, 2015

QUALITY DISTRIBUTION, INC.

(Exact name of registrant as specified in its charter)

4041 Park Oaks Boulevard, Suite 200

Tampa, Florida 33610

(Address of principal executive offices including Zip Code)

(813) 630-5826

(Registrant’s telephone number, including area code)

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:

On May 13, 2015, Quality Distribution, Inc. (the “Company”) announced that its Board of Directors has determined to postpone the 2015 Annual Meeting of Shareholders, originally scheduled for May 28, 2015. The postponement is due to the Company’s recent announcement that it has entered into a definitive merger agreement, dated May 6, 2015, with Gruden Acquisition, Inc. and Gruden Merger Sub, Inc., which are affiliates of Apax Partners, L.P.

At a later date, the Company will provide information related to a rescheduled shareholder meeting.

(d) Exhibits.

Forward-Looking Statements

This Form 8-K contains, and other written or oral statements made by or on behalf of The Company may include, forward-looking statements, within the meaning of the Private Securities Litigation Reform Act of 1995. In addition, we or our executive officers on our behalf, may from time to time make forward-looking statements in reports and other documents that are filed with the Securities and Exchange Commission (SEC) or in connection with oral statements made to the press, potential investors or others. Specifically, forward-looking statements may include, but are not limited to, statements relating to our future economic performance, business prospects, revenue, income, and financial condition; and statements preceded by, followed by, or that include the words “expects,” “believes,” “intends,” “will,” “anticipates,” and similar terms that relate to future events, performance, or our results. Examples of forward-looking statements in this press release include, but are not limited to, statements about the price, terms and closing date of the proposed transaction and statements regarding shareholder and regulatory approvals. Forward-looking statements are subject to certain risks and uncertainties that could cause actual results, expectations, or outcomes to differ materially from our historical experience as well as management’s present expectations or projections. These risks and uncertainties include, but are not limited to: (i) the occurrence of any event, change or other circumstances that could give rise to the termination of the merger agreement; (ii) the inability to complete the proposed merger due to the failure to obtain Company Requisite Vote or the failure to satisfy other conditions of the proposed merger within the proposed timeframe or at all; (iii) the failure to obtain the necessary financing arrangements as set forth in the debt and equity commitment letters delivered pursuant to the merger agreement, or the failure of the proposed merger to close for any other reason; (iv) risks related to disruption of management’s attention from the Company’s ongoing business operations due to the transaction; (v) the outcome of any legal proceedings, regulatory proceedings or enforcement matters that may be instituted against the Company and others relating to the merger agreement; (vi) the risk that the pendency of the proposed merger disrupts current plans and operations and the potential difficulties in employee retention as a result of the pendency of the proposed merger; (vii) the effect of the announcement of the proposed merger on the Company’s relationships with its customers, operating results and business generally; and (viii) the amount of the costs, fees, expenses and charges related to the proposed merger. Consider these factors carefully in evaluating the forward-looking statements. Additional factors that may cause results to differ materially from those described in the forward-looking statements are set forth in the Company’s Annual Report on Form 10—K for the fiscal year ended December 31, 2014, which was filed with the SEC on March 13, 2015. The forward-looking statements represent the Company’s views as of the date on which such statements were made and the Company undertakes no obligation to publicly update such forward-looking statements.

Participants in the Solicitation

The Company and its directors, executive officers and certain other members of management and employees of the Company may be deemed to be “participants” in the solicitation of proxies from the shareholders of the Company in connection with the proposed merger. Information regarding the interests of the persons who may, under the rules of the SEC, be considered participants in the solicitation of the shareholders of the Company in connection with the proposed merger, which may be different than those of the Company’s shareholders generally, will be set forth in the proxy statement and the other relevant documents to be filed with the SEC. Shareholders can find information about the Company and its directors and executive officers and their ownership of the Company’s common stock in the Company’s annual report on Form 10-K for the fiscal year ended December 31, 2014 and in its definitive proxy statement relating to its 2015 annual meeting of stockholders filed with the SEC on April 24, 2015. Additional information regarding the interests of such individuals in the proposed merger will be included in the proxy statement relating to the merger when it is filed with the SEC. These documents may be obtained free of charge from the SEC’s website at www.sec.gov and the Company’s website at https://www.qualitydistribution.com/.

Important Additional Information and Where to Find It

This communication may be deemed to be solicitation material in respect of the proposed acquisition of the Company by Apax Partners and its affiliates. In connection with the proposed transaction, the Company will file with the SEC and furnish to its stockholders a proxy statement and other relevant documents. QUALITY STOCKHOLDERS ARE ADVISED TO READ THE PROXY STATEMENT WHEN IT BECOMES AVAILABLE (INCLUDING ALL AMENDMENTS AND SUPPLEMENTS THERETO) BECAUSE IT WILL CONTAIN IMPORTANT INFORMATION. Investors may obtain a free copy of the proxy statement (when it becomes

available) and other relevant documents filed by the Company with the SEC at the SEC’s Web site at http://www.sec.gov. The proxy statement and such other documents filed by the Company with the SEC may also be obtained for free from the Investor Relations section of the Company’s web site (https://www.qualitydistribution.com/) or by directing a request to: Quality Distribution, Inc., 4041 Park Oaks Blvd., Suite 200, Tampa, FL 33610, Attention: Investor Relations.

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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