Item 8.01. Other Events.

On October 3, 2021, Marten Transport, Ltd. (the "Company") detected a cyberattack that accessed and encrypted files on servers utilized by the Company in the provision of its business. The unauthorized access also included the download of certain data files.

Promptly upon discovery of the incident, the Company launched an investigation and engaged legal counsel and industry-leading incident response professionals. The Company has notified law enforcement and will provide any notices that may be required by applicable law. While the investigation of the incident is ongoing, the Company has implemented a series of containment and remediation measures to address this situation and reinforce the security of its information technology systems. As a result, the Company was able to restore full functionality to its information technology systems quickly with minimal disruptions to its operations.

Based on its preliminary assessment and on the information currently known, the Company does not believe the incident will have a material impact on its business, operations or financial results. Nonetheless, the investigation indicates that certain employee data may have been at risk during the event and, out of an abundance of caution, the Company is offering its employees with credit monitoring and identity restoration services at no cost for two years.


              Cautionary Note Regarding Forward Looking Statements

This Form 8-K contains certain statements that may be considered forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, including the Company's current expectations concerning the resolution of this cyberattack and its impact on the Company's business, operations or financial results. These statements by their nature involve substantial risks and uncertainties, and actual results may differ materially from those expressed in such forward-looking statements. Important factors known to the Company that could cause actual results to differ materially from those discussed in the forward-looking statements are discussed above and in Part I, Item 1A of the Company's Annual Report on Form 10-K for the year ended December 31, 2020. The Company undertakes no obligation to correct or update any forward-looking statements, whether as a result of new information, future events or otherwise.

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