Material Agreement

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):  August 11, 2017 Kirby Corporation (Exact name of registrant as specified in its charter) Nevada 1-7615 74-1884980 (State or other jurisdiction of (Commission File Number) (I.R.S. Employer incorporation or organization)   Identification No.)       55 Waugh Drive, Suite 1000   77007 Houston, Texas   (Zip Code) (Address of principal executive offices)       Registrant’s telephone number, including area code: (713) 435-1000 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: ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934 Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐   Item  1.01. Entry into a Material Definitive Agreement.   On August 11, 2017, Kirby Corporation and Stewart & Stevenson LLC amended the previously announced Purchase and Sale Agreement (the “Agreement”) between Kirby and Stewart & Stevenson dated as of June 13, 2017 to extend the “Outside Date” in Section 8.1(c) of the Agreement to September 14, 2017. Item 9.01. Financial Statements and Exhibits   (d)  Exhibits     2.1 Amendment No. 2 to Purchase and Sale Agreement dated as of August 11, 2017 between Stewart & Stevenson LLC and Kirby Corporation. 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 thereunto duly authorized.   KIRBY CORPORATION (Registrant)         By: /s/ C. Andrew Smith     C. Andrew Smith Executive Vice President and Chief Financial Officer Dated:  August 11, 2017   EXHIBIT INDEX Exhibit Number   Description of Exhibit         2.1   — Amendment No. 2 to Purchase and Sale Agreement dated as of August 11, 2017 between Stewart & Stevenson LLC and Kirby Corporation.