X0306 4 2021-03-18 0 0000799167 MARTEN TRANSPORT LTD MRTN 0001204974 WINKEL THOMAS J 129 MARTEN STREET MONDOVI WI 54755 1 0 0 0 Common Stock 2021-03-18 4 M 0 9375 5.733 A 46861 D Common Stock 2021-03-18 4 S 0 6000 16.7672 D 40861 D Stock Option (right to buy) 5.733 2021-03-18 4 M 0 9375 0 D 2021-05-03 Common Stock 9375 0 D On July 16, 2020, Marten declared a three-for-two stock split effected in the form of a stock dividend, payable on August 13, 2020 to all holders of record of common stock on July 30, 2020. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.75 to $16.80, 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, attorney-in-fact 2021-03-19