{"data":[{"accessionNo":"0000019617-26-000338","formType":"SCHEDULE 13G/A","amendmentNo":1,"issuerCik":"0000936395","issuerName":"Ciena Corporation","ticker":"CIEN","cusip":"171779309","securityClass":"Common Stock, par value $0.01 per share","eventDate":"2026-08-31","reportingPerson":"JPMORGAN CHASE & CO.","reportingCik":null,"personType":"HC","sharesOwned":5616378,"percentOfClass":3.9,"filedAt":"2026-09-03","canonicalUrl":"https://xoomar.com/markets/stocks/cien"},{"accessionNo":"0000315066-26-001963","formType":"SCHEDULE 13G/A","amendmentNo":5,"issuerCik":"0000936395","issuerName":"CIENA CORP","ticker":"CIEN","cusip":"171779309","securityClass":"COMMON STOCK","eventDate":"2026-06-30","reportingPerson":"FMR LLC","reportingCik":null,"personType":"HC","sharesOwned":19113537.72,"percentOfClass":13.5,"filedAt":"2026-08-06","canonicalUrl":"https://xoomar.com/markets/stocks/cien"},{"accessionNo":"0000315066-26-001963","formType":"SCHEDULE 13G/A","amendmentNo":5,"issuerCik":"0000936395","issuerName":"CIENA CORP","ticker":"CIEN","cusip":"171779309","securityClass":"COMMON STOCK","eventDate":"2026-06-30","reportingPerson":"Abigail P. Johnson","reportingCik":null,"personType":"IN","sharesOwned":19113537.72,"percentOfClass":13.5,"filedAt":"2026-08-06","canonicalUrl":"https://xoomar.com/markets/stocks/cien"},{"accessionNo":"0002100119-26-000333","formType":"SCHEDULE 13G","amendmentNo":null,"issuerCik":"0000936395","issuerName":"Ciena Corp","ticker":"CIEN","cusip":"171779309","securityClass":"Common Stock","eventDate":"2026-03-31","reportingPerson":"Vanguard Capital Management","reportingCik":null,"personType":"IA","sharesOwned":10568831,"percentOfClass":7.47,"filedAt":"2026-04-29","canonicalUrl":"https://xoomar.com/markets/stocks/cien"},{"accessionNo":"0002100121-26-000185","formType":"SCHEDULE 13G","amendmentNo":null,"issuerCik":"0000936395","issuerName":"Ciena Corp","ticker":"CIEN","cusip":"171779309","securityClass":"Common Stock","eventDate":"2026-03-31","reportingPerson":"Vanguard Portfolio Management","reportingCik":null,"personType":"IA","sharesOwned":7388304,"percentOfClass":5.22,"filedAt":"2026-04-29","canonicalUrl":"https://xoomar.com/markets/stocks/cien"},{"accessionNo":"0002012383-26-001485","formType":"SCHEDULE 13G/A","amendmentNo":5,"issuerCik":"0000936395","issuerName":"CIENA CORPORATION","ticker":"CIEN","cusip":"171779309","securityClass":"Common Stock","eventDate":"2026-03-31","reportingPerson":"BlackRock, Inc.","reportingCik":null,"personType":"HC","sharesOwned":11274540,"percentOfClass":8,"filedAt":"2026-04-24","canonicalUrl":"https://xoomar.com/markets/stocks/cien"},{"accessionNo":"0000102909-26-000972","formType":"SCHEDULE 13G/A","amendmentNo":13,"issuerCik":"0000936395","issuerName":"Ciena Corp","ticker":"CIEN","cusip":"171779309","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/cien"},{"accessionNo":"0000019617-26-000041","formType":"SCHEDULE 13G","amendmentNo":null,"issuerCik":"0000936395","issuerName":"Ciena Corporation","ticker":"CIEN","cusip":null,"securityClass":"Common Stock, $0.01 par value","eventDate":"2025-12-31","reportingPerson":"JPMORGAN CHASE & CO.","reportingCik":null,"personType":"HC","sharesOwned":10851732,"percentOfClass":7.7,"filedAt":"2026-01-21","canonicalUrl":"https://xoomar.com/markets/stocks/cien"},{"accessionNo":"0002012383-25-002995","formType":"SCHEDULE 13G/A","amendmentNo":4,"issuerCik":"0000936395","issuerName":"CIENA CORPORATION","ticker":"CIEN","cusip":null,"securityClass":"Common Stock","eventDate":"2025-11-30","reportingPerson":"BlackRock, Inc.","reportingCik":null,"personType":"HC","sharesOwned":14537914,"percentOfClass":10.3,"filedAt":"2025-12-04","canonicalUrl":"https://xoomar.com/markets/stocks/cien"}],"updatedAt":"2026-11-04T07:41:37.565Z","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/cien","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."}}