X0306 4 2022-03-10 0 0000799167 MARTEN TRANSPORT LTD MRTN 0001348356 Hinnendael James J 129 MARTEN STREET MONDOVI WI 54755 0 1 0 0 Exec. VP and CFO Common Stock 2022-03-10 4 M 0 8451 9.008 A 145661 D Common Stock 2022-03-10 4 S 0 6350 18.3807 D 139311 D Stock Option (right to buy) 9.008 2022-03-10 4 M 0 8451 0 D 2022-05-12 Common Stock 8451 0 D Includes: (i) 4,832 shares granted under a Performance Unit Award Agreement that vest on 12/31/2022 through 12/31/2025; (ii) 1,515 shares granted under a Performance Unit Award Agreement that vest on 12/31/2022 through 12/31/2024; (iii) 2,040 shares granted under a Performance Unit Award Agreement that vest on 12/31/2022 through 12/31/2023; and (iv) 1,065 shares granted under a Performance Unit Award Agreement that vest on 12/31/2022. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.27 to $18.51, inclusive. The reporting person undertakes to provide to Marten Transport, Ltd., any security holder of Marten Transport, Ltd., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2) to this Form 4. This option has fully vested. /s/ James J. Hinnendael 2022-03-11