Exhibit 99.1 MARTEN TRANSPORT ANNOUNCES THIRD QUARTER RESULTS MONDOVI, Wis., October 22, 2026 (GLOBE NEWSWIRE) -- Marten Transport, Ltd. (Nasdaq/GS:MRTN) today reported a 30.7% improvement in net income to $2.9 million, or 4 cents per diluted share, for the third quarter ended September 30, 2026, from $2.2 million, or 3 cents per diluted share, for the third quarter of 2025. For the nine-month period ended September 30, 2026, net income was $9.6 million, or 12 cents per diluted share, compared with $13.7 mi ...