Omnicom Group (OMC): STATE STREET CORP discloses a stake of more than 5% (Schedule 13G)

State Street Corp. disclosed a stake exceeding 5% in Omnicom Group (OMC) via a Schedule 13G filing with the SEC (accession 0000093751-26-000699). The passive-investor threshold crossing makes State Street one of Omnicom's largest institutional holders, a position typically tied to index and custody mandates rather than activist intent. The disclosure comes as Omnicom integrates its acquisition of Interpublic Group, a deal that reshaped the advertising sector's competitive landscape. Investors will watch whether State Street's position shifts in future 13F filings and whether index reconstitution tied to the combined company alters Omnicom's shareholder base.