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Omnicom Group

Global advertising and marketing holding company

New York-based advertising and marketing holding company, one of the industry's 'Big Four.' In November 2025 it completed its acquisition of Interpublic Group, forming the world's largest marketing and communications company. Owns agency networks including BBDO, DDB and TBWA. [Omnicom Completes Acquisition of Interpublic, Forming the World's Leading Marketing and Sales Company ↗]

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Entries here reflect documented financial, professional, or organizational ties drawn from public records — campaign-finance filings, corporate and regulatory disclosures, and reporting. Appearing in this graph is not an allegation of wrongdoing. Every claim shown links to its source. How we source this · Request a correction