{"schema_version":"secwatch.filing_event.v1","accession":"0001437749-21-024381","form_type":"8-K","ticker":"MRTN","cik":"0000799167","company_name":"MARTEN TRANSPORT LTD","filed_at":"2021-10-27T23:59:59+00:00","discovered_at":"2026-05-14T18:04:15.628615+00:00","generated_at":"2026-06-28T17:42:17.489727+00:00","sec_items":["8.01"],"event_type":"cyber","sentiment":"negative","materiality_score":0.6,"calibrated_materiality_score":0.6,"confidence":"high","headline":"Marten Transport reports cyberattack on Oct 3; files encrypted, employee data possibly exposed","bullets":["Detected on Oct 3, 2021; cyberattack accessed and encrypted files on servers; also downloaded certain data files.","Investigation ongoing with external incident response professionals; law enforcement notified.","Full system functionality restored quickly with minimal operational disruptions; containment and remediation measures implemented.","Preliminary assessment indicates incident will not have a material impact on business, operations, or financial results.","Employee data may have been at risk; company offering two years of credit monitoring and identity restoration services at no cost."],"urls":{"canonical":"https://secwatch.observer/filing/0001437749-21-024381","json":"https://secwatch.observer/filing/0001437749-21-024381.json","markdown":"https://secwatch.observer/filing/0001437749-21-024381.md","text":"https://secwatch.observer/filing/0001437749-21-024381.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/799167/000143774921024381/0001437749-21-024381-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/799167/000143774921024381/mrtn20211026_8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-28T17:42:17.489727+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}