X0609 4 2026-05-05 0 0000799167 MARTEN TRANSPORT LTD MRTN 0002005041 Phillips Adam Daniel false C/O MARTEN TRANSPORT, LTD. 129 MARTEN STREET MONDOVI WI 54755 0 1 0 0 EVP & Chief Operating Officer 0 Common Stock 2026-05-05 4 A 0 4661 0 A 15284 D These shares granted under a Performance Unit Award Agreement will vest in equal increments over five years beginning on December 31, 2026. Includes: (i) 4,661 shares granted under a Performance Award Agreement that vest on 12/31/2026 through 12/31/2030; (ii) 4,098 shares granted under a Performance Award Agreement that vest on 12/31/2026 through 12/31/2029; (iii) 2,314 shares granted under a Performance Award Agreement that vest on 12/31/2026 through 12/31/2028; (iv) 600 shares granted under a Performance Award Agreement that vest on 12/31/2026 through 12/31/2027; and (v) 300 shares granted under a Performance Award Agreement that vest on 12/31/2026. /s/ James J. Hinnendael, attorney-in-fact 2026-05-07