On Wednesday, October 24, 2012, Knight Transportation, Inc., an Arizona corporation (the "Company"), issued a press release (the "Press Release") announcing its financial results for the quarter ended September 30, 2012. A copy of the Press Release is attached to this report as Exhibit 99.

            (d)      Exhibits.

           EXHIBIT
           NUMBER  EXHIBIT DESCRIPTION

             99    Knight Transportation, Inc. press release announcing financial
                   results for the quarter ended September 30, 2012

The information contained in this report (including Items 2.02 and 9.01) and the exhibit hereto shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or incorporated by reference in any filing under the Securities Act of 1933, as amended (the "Securities Act"), or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

The information in this report and the exhibit hereto may contain "forward-looking statements" within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act. Such statements are made based on the current beliefs and expectations of the Company's management and are subject to significant risks and uncertainties. Actual results or events may differ from those anticipated by forward-looking statements. Please refer to the paragraph following the financial and operating information in the attached press release and various disclosures by the Company in its press releases, stockholder reports, and filings with the Securities and Exchange Commission for information concerning risks, uncertainties, and other factors that may affect future results.