Exhibit 99.1 MARTEN TRANSPORT ANNOUNCES SECOND QUARTER RESULTS MONDOVI, Wis., July 23, 2026 (GLOBE NEWSWIRE) -- Marten Transport, Ltd. (Nasdaq/GS:MRTN) today reported net income of $5.3 million, or 7 cents per diluted share, for the second quarter ended June 30, 2026, compared with $7.2 million, or 9 cents per diluted share, for the second quarter of 2025. The 2026 second-quarter earnings improved 286.3% sequentially from 2026 first-quarter net income of $1.4 million, or 2 cents per diluted share. For the s ...