MARTEN TRANSPORT LTD 10-Q

Item 1A. Risk Factors.   There have been no material changes in the risk factors disclosed by us under Part I, Item 1A. Risk Factors contained in the Annual Report on Form 10-K for the year ended December 31, 2019, or under Part II, Item 1A. Risk Factors contained in the Quarterly Report on Form 10-Q for the quarter ended March 31, 2020.   Item 6. Exhibits.     Item No. Item    Method of Filing 10.26 Form of Performance Unit Award Agreement for the 2015 Equity Incentive Plan    Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed May 11, 2020.         31.1 Certification pursuant to Item 601(b)(31) of Regulation S-K, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, by Randolph L. Marten, the Registrant’s Chief Executive Officer (Principal Executive Officer)    Filed with this Report.         31.2 Certification pursuant to Item 601(b)(31) of Regulation S-K, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, by James J. Hinnendael, the Registrant’s Executive Vice President and Chief Financial Officer (Principal Financial Officer)    Filed with this Report.         32.1 Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002    Filed with this Report.          101 The following financial information from Marten Transport, Ltd.’s Quarterly Report on Form 10-Q for the period ended June 30, 2020, filed with the SEC on August 7, 2020, formatted in iXBRL, or Inline eXtensible Business Reporting Language: (i) Consolidated Condensed Balance Sheets, (ii) Consolidated Condensed Statements of Operations, (iii) Consolidated Condensed Statements of Stockholders’ Equity, (iv)  Consolidated Condensed Statements of Cash Flows, and (v) Notes to Consolidated Condensed Financial Statements    Filed with this Report.                                         104 The cover page from Marten Transport, Ltd.’s Quarterly Report on Form 10-Q for the period ended June 30, 2020, formatted in iXBRL, included in Exhibit 101   Filed with this Report.     25     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.      MARTEN TRANSPORT, LTD.                   Dated: August 7, 2020 By: /s/ Randolph L. Marten       Randolph L. Marten       Chief Executive Officer       (Principal Executive Officer)                   Dated: August 7, 2020 By: /s/ James J. Hinnendael       James J. Hinnendael       Executive Vice President and Chief Financial Officer       (Principal Financial and Accounting Officer)   26