Amendment to Credit Agreement

Marten Transport, Ltd. has entered into the First Amendment to Credit Agreement, which amends the existing credit agreement dated August 16, 2022. The amendment, effective June 12, 2026, increases the sublimit for letters of credit from $30 million to $35 million and raises the maximum aggregate principal amount from $100 million to $105 million. Additionally, it provides for an Amended and Restated Revolving Note up to $35 million. The amendment also includes updated provisions regarding Anti-Corruption Laws and Sanctions, and confirms that the credit agreement remains in full force and effect. Guarantor subsidiaries have acknowledged and agreed to the amendment, confirming their guarantees remain in effect.