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. 98.5% of the shares are freely tradable; institutional investors hold 112.6%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 10.42 | 28,593,656 | -3.1 | 06/30/2026 |
| State Street Corp | 8.96 | 24,590,402 | -11.4 | 06/30/2026 |
| Vanguard Capital Management, LLC | 6.78 | 18,596,140 | -8.4 | 06/30/2026 |
| Arnhold & S. Bleichroeder Advisers, LLC | 5.35 | 14,686,418 | +101.1 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 4.91 | 13,478,004 | -9.2 | 06/30/2026 |
| Bank of New York Mellon Corp | 4.58 | 12,551,916 | +3.8 | 06/30/2026 |
| JPMorgan Chase & Co | 4.41 | 12,085,435 | +0.4 | 06/30/2026 |
| Geode Capital Management, LLC | 3.15 | 8,645,204 | -7.2 | 06/30/2026 |
| Massachusetts Financial Services Company | 3.03 | 8,305,876 | -4.9 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 3.18 | 8,716,090 | -3.8 | 09/30/2026 |
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 | 21,072,912 $ | Aug 15, 2026 | direct |
| Coleman Leonard S Jr | Director | 51,362 | 4,314,368 $ | Oct 1, 2026 | direct |
| Choksi Mary C | Director | 49,093 | 4,123,797 $ | Oct 1, 2026 | direct |
| Januzzi Louis F | Senior VP, Gen. Counsel & Sec. | 39,558 | 3,322,910 $ | Aug 15, 2026 | direct |
| Martore Gracia C | Director | 29,355 | 2,465,781 $ | Oct 1, 2026 | direct |
| Kissire Deborah J. | Director | 28,683 | 2,409,390 $ | Oct 1, 2026 | direct |
| Williams Valerie | Director | 27,327 | 2,295,463 $ | Oct 1, 2026 | direct |
| Wyatt E Lee | Director | 25,198 | 2,116,632 $ | Oct 1, 2026 | direct |
| Moore Patrick Q | Director | 25,198 | 2,116,632 $ | Oct 1, 2026 | direct |
| Hawkins Ronnie S. | Director | 22,813 | 1,916,282 $ | Oct 1, 2026 | direct |
| Castellaneta Andrew | SVP, Chief Accounting Officer | 20,795 | 1,746,780 $ | Aug 15, 2026 | direct |
| Gerstein Mark D | Director | 17,485 | 1,468,742 $ | Oct 1, 2026 | direct |
| Rice Linda Johnson | Director | 12,521 | 1,051,804 $ | Oct 1, 2026 | direct |
| Pineda Patricia Salas | Director | 12,145 | 1,020,197 $ | Oct 1, 2026 | direct |
| Santos Cassandra | Director | 7,311 | 614,117 $ | Oct 1, 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 |
|---|---|---|---|---|---|---|
| Oct 1, 2026 | Wyatt E Lee | Director | Other | 697 | 0.00 | – |
| Oct 1, 2026 | Williams Valerie | Director | Other | 696 | 0.00 | – |
| Oct 1, 2026 | Santos Cassandra | Director | Other | 696 | 0.00 | – |
| Oct 1, 2026 | Rice Linda Johnson | Director | Other | 697 | 0.00 | – |
| Oct 1, 2026 | Pineda Patricia Salas | Director | Other | 696 | 0.00 | – |
| Oct 1, 2026 | Moore Patrick Q | Director | Other | 697 | 0.00 | – |
| Oct 1, 2026 | Martore Gracia C | Director | Other | 696 | 0.00 | – |
| Oct 1, 2026 | Kissire Deborah J. | Director | Other | 696 | 0.00 | – |
| Oct 1, 2026 | Hawkins Ronnie S. | Director | Other | 696 | 0.00 | – |
| Oct 1, 2026 | Gerstein Mark D | Director | Other | 306 | 0.00 | – |
| Oct 1, 2026 | Gerstein Mark D | Director | Other | 696 | 0.00 | – |
| Oct 1, 2026 | Coleman Leonard S Jr | Director | Other | 696 | 0.00 | – |
| Oct 1, 2026 | Choksi Mary C | Director | Other | 696 | 0.00 | – |
| 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: November 2, 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.