{"data":[{"accessionNo":"0000814133-26-000116","formType":"SCHEDULE 13G/A","amendmentNo":1,"issuerCik":"0000911177","issuerName":"Casella Waste Systems Inc","ticker":"CWST","cusip":"147448104","securityClass":"Common Stock SH","eventDate":"2026-09-30","reportingPerson":"Wasatch Advisors LP","reportingCik":null,"personType":"IA","sharesOwned":3056089,"percentOfClass":4.9,"filedAt":"2026-10-09","canonicalUrl":"https://xoomar.com/markets/stocks/cwst"},{"accessionNo":"0000814133-26-000074","formType":"SCHEDULE 13G","amendmentNo":null,"issuerCik":"0000911177","issuerName":"Casella Waste Systems Inc","ticker":"CWST","cusip":"147448104","securityClass":"CL A","eventDate":"2026-06-30","reportingPerson":"Wasatch Advisors LP","reportingCik":null,"personType":"IA","sharesOwned":3531594,"percentOfClass":5.6,"filedAt":"2026-07-09","canonicalUrl":"https://xoomar.com/markets/stocks/cwst"},{"accessionNo":"0002100121-26-000223","formType":"SCHEDULE 13G","amendmentNo":null,"issuerCik":"0000911177","issuerName":"Casella Waste Systems Inc","ticker":"CWST","cusip":"147448104","securityClass":"Common Stock","eventDate":"2026-03-31","reportingPerson":"Vanguard Portfolio Management","reportingCik":null,"personType":"IA","sharesOwned":3407917,"percentOfClass":5.45,"filedAt":"2026-04-29","canonicalUrl":"https://xoomar.com/markets/stocks/cwst"},{"accessionNo":"0002100119-26-000340","formType":"SCHEDULE 13G","amendmentNo":null,"issuerCik":"0000911177","issuerName":"Casella Waste Systems Inc","ticker":"CWST","cusip":"147448104","securityClass":"Common Stock","eventDate":"2026-03-31","reportingPerson":"Vanguard Capital Management","reportingCik":null,"personType":"IA","sharesOwned":3276229,"percentOfClass":5.23,"filedAt":"2026-04-29","canonicalUrl":"https://xoomar.com/markets/stocks/cwst"},{"accessionNo":"0000814133-26-000051","formType":"SCHEDULE 13G/A","amendmentNo":1,"issuerCik":"0000911177","issuerName":"Casella Waste Systems Inc","ticker":"CWST","cusip":"147448104","securityClass":"CL A","eventDate":"2026-03-31","reportingPerson":"Wasatch Advisors LP","reportingCik":null,"personType":"IA","sharesOwned":2582220,"percentOfClass":4.1,"filedAt":"2026-04-22","canonicalUrl":"https://xoomar.com/markets/stocks/cwst"},{"accessionNo":"0000102909-26-000813","formType":"SCHEDULE 13G/A","amendmentNo":5,"issuerCik":"0000911177","issuerName":"Casella Waste Systems Inc","ticker":"CWST","cusip":"147448104","securityClass":"Common Stock","eventDate":"2026-03-13","reportingPerson":"The Vanguard Group","reportingCik":null,"personType":"IA","sharesOwned":0,"percentOfClass":0,"filedAt":"2026-03-26","canonicalUrl":"https://xoomar.com/markets/stocks/cwst"},{"accessionNo":"0002012383-26-000049","formType":"SCHEDULE 13G/A","amendmentNo":14,"issuerCik":"0000911177","issuerName":"CASELLA WASTE SYSTEMS INC","ticker":"CWST","cusip":null,"securityClass":"Class A Stock","eventDate":"2025-12-31","reportingPerson":"BlackRock, Inc.","reportingCik":null,"personType":"HC","sharesOwned":8928731,"percentOfClass":14.3,"filedAt":"2026-01-08","canonicalUrl":"https://xoomar.com/markets/stocks/cwst"},{"accessionNo":"0000102909-26-000012","formType":"SCHEDULE 13G/A","amendmentNo":4,"issuerCik":"0000911177","issuerName":"Casella Waste Systems Inc","ticker":"CWST","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-31","reportingPerson":"The Vanguard Group","reportingCik":null,"personType":"IA","sharesOwned":6574893,"percentOfClass":10.51,"filedAt":"2026-01-07","canonicalUrl":"https://xoomar.com/markets/stocks/cwst"}],"updatedAt":"2026-10-24T22:46:24.119Z","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","canonicalUrl":"https://xoomar.com/markets/stocks/cwst","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."}}