Omnicom Group Inc
Ownership
Ownership Structure
Who owns Omnicom Group Inc (OMC)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 95.3% of the shares are freely tradable; institutional investors hold 112.6%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 10.75 | 29,498,159 | +1.1 | 03/31/2026 |
| State Street Corp | 10.12 | 27,760,218 | +17.2 | 03/31/2026 |
| Vanguard Capital Management, LLC | 7.40 | 20,295,276 | +0.0 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 5.41 | 14,840,407 | +0.0 | 03/31/2026 |
| Arnhold & S. Bleichroeder Advisers, LLC | 5.35 | 14,686,418 | +101.1 | 06/30/2026 |
| Bank of New York Mellon Corp | 4.41 | 12,098,191 | +7.2 | 03/31/2026 |
| JPMorgan Chase & Co | 4.39 | 12,031,678 | +13.9 | 03/31/2026 |
| Geode Capital Management, LLC | 3.40 | 9,313,917 | +8.6 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| State Street® CommServSelSectSPDR®ETF | 4.25 | 11,646,379 | +0.2 | 08/31/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.31 | 9,078,018 | +0.3 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Simm Daryl | Co-President and Co-COO | 250,868 | 19,718,225 $ | Aug 15, 2026 | direct |
| Januzzi Louis F | Senior VP, Gen. Counsel & Sec. | 39,558 | 3,109,294 $ | Aug 15, 2026 | direct |
| Castellaneta Andrew | SVP, Chief Accounting Officer | 20,795 | 1,634,487 $ | Aug 15, 2026 | direct |
| Rice Linda Johnson | Director | 11,719 | 921,129 $ | Aug 24, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 24, 2026 | Rice Linda Johnson | Director | Sell | 1,385 | 88.73 | 122,891 |
| Aug 15, 2026 | Simm Daryl | Co-President and Co-COO | Other | 3,172 | 87.57 | 277,772 |
| Aug 15, 2026 | Januzzi Louis F | Senior VP, Gen. Counsel & Sec. | Other | 1,308 | 87.57 | 114,542 |
| Aug 15, 2026 | Castellaneta Andrew | SVP, Chief Accounting Officer | Other | 1,348 | 87.57 | 118,044 |
| Jul 16, 2026 | Januzzi Louis F | Senior VP, Gen. Counsel & Sec. | Other | 7,720 | 0.00 | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.