X0508 4 2024-07-25 0 0000799167 MARTEN TRANSPORT LTD MRTN 0002005041 Phillips Adam Daniel 129 MARTEN STREET MONDOVI WI 54755 0 1 0 0 EVP & Chief Operating Officer 0 Common Stock 2024-07-25 4 M 0 4500 10.867 A 11948 D Common Stock 2024-07-25 4 S 0 4500 18.3412 D 7448 D Stock Option (right to buy) 10.867 2024-07-25 4 M 0 4500 0 D 2024-08-15 Common Stock 4500 0 D Includes: (i) 3,858 shares granted under a Performance Unit Award Agreement that vest on 12/31/2024 through 12/31/2028; (ii) 1,200 shares granted under a Performance Unit Award Agreement that vest on 12/31/2024 through 12/31/2027; (iii) 900 shares granted under a Performance Unit Award Agreement that vest on 12/31/2024 through 12/31/2026; (iv) 400 shares granted under a Performance Unit Award Agreement that vest on 12/31/2024 through 12/31/2025; and (v) 300 shares granted under a Performance Unit Award Agreement that vest on 12/31/2024. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.3401 to $18.35, 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. All shares are vested. /s/ James J. Hinnendael, attorney-in-fact 2024-07-25