Cassandra Santos - 01 Jul 2025 Form 4 Insider Report for OMNICOM GROUP INC. (OMC)

Role: Director
Signature: /s/ Eric J. Cleary, Attorney in Fact for Cassandra Santos
Issuer symbol: OMC
Transactions as of: 01 Jul 2025
Net transactions value: $0
Form type: 4
Filing time: 03 Jul 2025, 16:32:05 UTC
Previous filing: 09 May 2025
Next filing: 03 Oct 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Santos Cassandra	Director	C/O OMNICOM GROUP INC., 280 PARK AVENUE, NEW YORK	/s/ Eric J. Cleary, Attorney in Fact for Cassandra Santos	03 Jul 2025	0002004987

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	OMC	Common Stock, par value $0.15 per share	Award	$0	+712	+23%	$0.000000	3,838	01 Jul 2025	Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
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 April 9, 2025.