Exhibit 99.1 MARTEN TRANSPORT ANNOUNCES FIRST QUARTER RESULTS MONDOVI, Wis., April 18, 2024 (GLOBE NEWSWIRE) -- Marten Transport, Ltd. (Nasdaq/GS:MRTN) today reported net income of $9.6 million, or 12 cents per diluted share, for the first quarter ended March 31, 2024, compared with$22.5 million, or 28 cents per diluted share, for the first quarter of 2023. Operating revenue was $249.7 million for the first quarter of 2024 compared with$298.0 million for the first quarter of 2023. Excluding fuel surcharge ...