Marten Transport, Ltd. announced earnings results for the first quarter ended March 31, 2021. For the first quarter, the company announced sales was USD 223.046 million compared to USD 218.646 million a year ago. Operating income was USD 23.998 million compared to USD 18.032 million a year ago. Net income was USD 18.006 million compared to USD 13.718 million a year ago. Basic earnings per share from continuing operations was USD 0.22 compared to USD 0.17 a year ago.