Omnicom (OMC) 4: Williams Valerie bought 696 shares at $0.00 on 2026-10-01 (Oct 5, 2026)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-10-01 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: OMNICOM GROUP INC. (OMC) CIK: 0000029989 --- Reporting Owner --- Name: Williams Valerie CIK: 0001688234 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock, par value $0.15 per share Date: 2026-10-01 | Code: A (Grant or award) Shares: +696.05 | Price: $0.00 Shares Owned After: 27,326.94 | Ownership: D (Direct) Footnotes: [F1] The reporting person elected to defer receipt of these shares under the terms of the Omnicom Group Inc. 2021 Incentive Award Plan. [F2] Includes dividends on deferred shares that are reinvested in company stock, credited on July 9, 2025. --- Footnotes (Complete Index) --- F1: The reporting person elected to defer receipt of these shares under the terms of the Omnicom Group Inc. 2021 Incentive Award Plan. F2: Includes dividends on deferred shares that are reinvested in company stock, credited on July 9, 2025. --- Signature --- /s/ /s/ Eric J. Cleary, Attorney in Fact for Valerie Williams (2026-10-05)