{"data":[{"accessionNo":"0000093751-26-000514","formType":"SCHEDULE 13G","amendmentNo":null,"issuerCik":"0000029989","issuerName":"OMNICOM GROUP INC","ticker":"OMC","cusip":"681919106","securityClass":"COMMON STOCK","eventDate":"2026-06-30","reportingPerson":"STATE STREET CORPORATION","reportingCik":null,"personType":"HC","sharesOwned":24605548,"percentOfClass":8.6,"filedAt":"2026-08-07"},{"accessionNo":"0000093751-26-000514","formType":"SCHEDULE 13G","amendmentNo":null,"issuerCik":"0000029989","issuerName":"OMNICOM GROUP INC","ticker":"OMC","cusip":"681919106","securityClass":"COMMON STOCK","eventDate":"2026-06-30","reportingPerson":"SSGA FUNDS MANAGEMENT, INC.","reportingCik":null,"personType":"IA","sharesOwned":14532871,"percentOfClass":5.1,"filedAt":"2026-08-07"},{"accessionNo":"0002100121-26-000917","formType":"SCHEDULE 13G/A","amendmentNo":1,"issuerCik":"0000029989","issuerName":"Omnicom Group Inc","ticker":"OMC","cusip":"681919106","securityClass":"Common Stock","eventDate":"2026-06-30","reportingPerson":"Vanguard Portfolio Management","reportingCik":null,"personType":"IA","sharesOwned":13510040,"percentOfClass":4.74,"filedAt":"2026-07-31"},{"accessionNo":"0000093751-26-000278","formType":"SCHEDULE 13G","amendmentNo":null,"issuerCik":"0000029989","issuerName":"OMNICOM GROUP INC","ticker":"OMC","cusip":"681919106","securityClass":"COMMON STOCK","eventDate":"2026-03-31","reportingPerson":"STATE STREET CORPORATION","reportingCik":null,"personType":"HC","sharesOwned":27770464,"percentOfClass":9.7,"filedAt":"2026-05-12"},{"accessionNo":"0000093751-26-000278","formType":"SCHEDULE 13G","amendmentNo":null,"issuerCik":"0000029989","issuerName":"OMNICOM GROUP INC","ticker":"OMC","cusip":"681919106","securityClass":"COMMON STOCK","eventDate":"2026-03-31","reportingPerson":"SSGA FUNDS MANAGEMENT, INC.","reportingCik":null,"personType":"IA","sharesOwned":16680589,"percentOfClass":5.9,"filedAt":"2026-05-12"},{"accessionNo":"0002100119-26-000969","formType":"SCHEDULE 13G","amendmentNo":null,"issuerCik":"0000029989","issuerName":"Omnicom Group Inc","ticker":"OMC","cusip":"681919106","securityClass":"Common Stock","eventDate":"2026-03-31","reportingPerson":"Vanguard Capital Management","reportingCik":null,"personType":"IA","sharesOwned":23503262,"percentOfClass":8.24,"filedAt":"2026-04-30"},{"accessionNo":"0002100121-26-000586","formType":"SCHEDULE 13G","amendmentNo":null,"issuerCik":"0000029989","issuerName":"Omnicom Group Inc","ticker":"OMC","cusip":"681919106","securityClass":"Common Stock","eventDate":"2026-03-31","reportingPerson":"Vanguard Portfolio Management","reportingCik":null,"personType":"IA","sharesOwned":14878243,"percentOfClass":5.22,"filedAt":"2026-04-29"},{"accessionNo":"0000102909-26-001981","formType":"SCHEDULE 13G/A","amendmentNo":11,"issuerCik":"0000029989","issuerName":"Omnicom Group Inc","ticker":"OMC","cusip":"681919106","securityClass":"Common Stock","eventDate":"2026-03-13","reportingPerson":"The Vanguard Group","reportingCik":null,"personType":"IA","sharesOwned":0,"percentOfClass":0,"filedAt":"2026-03-27"},{"accessionNo":"0000093751-26-000003","formType":"SCHEDULE 13G","amendmentNo":null,"issuerCik":"0000029989","issuerName":"OMNICOM GROUP INC","ticker":"OMC","cusip":null,"securityClass":"COMMON STOCK","eventDate":"2025-12-31","reportingPerson":"STATE STREET CORPORATION","reportingCik":null,"personType":"HC","sharesOwned":23677784,"percentOfClass":7.5,"filedAt":"2026-01-08"},{"accessionNo":"0000093751-26-000003","formType":"SCHEDULE 13G","amendmentNo":null,"issuerCik":"0000029989","issuerName":"OMNICOM GROUP INC","ticker":"OMC","cusip":null,"securityClass":"COMMON STOCK","eventDate":"2025-12-31","reportingPerson":"SSGA FUNDS MANAGEMENT, INC.","reportingCik":null,"personType":"IA","sharesOwned":12551099,"percentOfClass":4,"filedAt":"2026-01-08"},{"accessionNo":"0000093751-25-000666","formType":"SCHEDULE 13G","amendmentNo":null,"issuerCik":"0000029989","issuerName":"OMNICOM GROUP INC","ticker":"OMC","cusip":null,"securityClass":"COMMON STOCK","eventDate":"2025-11-30","reportingPerson":"STATE STREET CORPORATION","reportingCik":null,"personType":"HC","sharesOwned":26656167,"percentOfClass":13.8,"filedAt":"2025-12-05"},{"accessionNo":"0000093751-25-000666","formType":"SCHEDULE 13G","amendmentNo":null,"issuerCik":"0000029989","issuerName":"OMNICOM GROUP INC","ticker":"OMC","cusip":null,"securityClass":"COMMON STOCK","eventDate":"2025-11-30","reportingPerson":"SSGA FUNDS MANAGEMENT, INC.","reportingCik":null,"personType":"IA","sharesOwned":15911611,"percentOfClass":8.2,"filedAt":"2025-12-05"}],"updatedAt":"2026-10-14T08:41:56.052Z","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."}}