{"data":[{"accessionNo":"0001473182-26-000007","formType":"SCHEDULE 13G/A","amendmentNo":3,"issuerCik":"0000799167","issuerName":"MARTEN TRANSPORT LTD","ticker":"MRTN","cusip":"573075108","securityClass":"COMMON","eventDate":"2026-04-10","reportingPerson":"Nuance Investments LLC","reportingCik":null,"personType":"IA","sharesOwned":0,"percentOfClass":4.9,"filedAt":"2026-07-06"},{"accessionNo":"0000102909-26-000203","formType":"SCHEDULE 13G/A","amendmentNo":2,"issuerCik":"0000799167","issuerName":"Marten Transport Ltd","ticker":"MRTN","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-31","reportingPerson":"The Vanguard Group","reportingCik":null,"personType":"IA","sharesOwned":4013753,"percentOfClass":4.92,"filedAt":"2026-01-30"},{"accessionNo":"0001473182-26-000004","formType":"SCHEDULE 13G/A","amendmentNo":1,"issuerCik":"0000799167","issuerName":"MARTEN TRANSPORT LTD","ticker":"MRTN","cusip":null,"securityClass":"COMMON","eventDate":"2025-12-31","reportingPerson":"Nuance Investments LLC","reportingCik":null,"personType":"IA","sharesOwned":0,"percentOfClass":7.69,"filedAt":"2026-01-22"},{"accessionNo":"0000354204-26-000326","formType":"SCHEDULE 13G/A","amendmentNo":17,"issuerCik":"0000799167","issuerName":"Marten Transport Ltd","ticker":"MRTN","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-31","reportingPerson":"Dimensional Fund Advisors LP","reportingCik":null,"personType":"IA","sharesOwned":4855737,"percentOfClass":6,"filedAt":"2026-01-21"}],"updatedAt":"2026-10-14T05:12:40.860Z","source":"xoomar.com","docs":"https://xoomar.com/markets/api","license":"https://xoomar.com/terms","attribution":"Credit XOOMAR with a link to the dataset page on xoomar.com when you republish this data","meta":{"source":"SEC","sourceAttribution":"Schedule 13D and 13G data: SEC.","notice":"10 requests a minute without a key, 30 with a free key. Get a free key at https://xoomar.com/signup?utm_source=api, register your app at https://xoomar.com/developers/register?utm_source=api, and credit the data as \"Data: XOOMAR\" together with the sourceAttribution line."}}