Omnicom Group Inc. (OMC) director adds 634.68 deferred shares

Rhea-AI Filing Summary

Omnicom Group Inc. reported that one of its directors acquired additional common stock through a deferred compensation election. On January 1, 2026, the reporting person acquired 634.68 shares of Omnicom common stock at a stated price of $0 per share under the Omnicom Group Inc. 2021 Incentive Award Plan, by choosing to defer receipt of shares rather than taking them currently in cash or stock.

After this transaction, the director beneficially owned a total of 5,130.48 shares of Omnicom common stock in direct form. This total includes dividends on previously deferred shares that were reinvested in company stock and credited on October 10, 2025, which are added to the director’s deferred share balance.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Santos Cassandra

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock, par value $0.15 per share	634.68	$0.00	--

Holdings After Transaction: Common Stock, par value $0.15 per share — 5,130.48 shares (Direct)

Footnotes (1)

1. The reporting person elected to defer receipt of these shares under the terms of the Omnicom Group Inc. 2021 Incentive Award Plan. Includes dividends on deferred shares that are reinvested in company stock, credited on October 10, 2025.

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Santos Cassandra

(Last) (First) (Middle)

C/O OMNICOM GROUP INC.

280 PARK AVENUE

(Street)

NEW YORK NY 10017

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
OMNICOM GROUP INC. [ OMC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
01/01/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock, par value $0.15 per share	01/01/2026		A		634.68(1)	A	$0	5,130.48(2)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The reporting person elected to defer receipt of these shares under the terms of the Omnicom Group Inc. 2021 Incentive Award Plan.

2. Includes dividends on deferred shares that are reinvested in company stock, credited on October 10, 2025.

	/s/ Eric J. Cleary, Attorney in Fact for Cassandra Santos	01/05/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transaction in OMC stock is disclosed here?

The filing shows that a director of Omnicom Group Inc. (OMC) acquired 634.68 shares of common stock on January 1, 2026 by deferring compensation into company stock.

How many Omnicom (OMC) shares does the director now beneficially own?

Following the reported transaction, the director beneficially owns 5,130.48 shares of Omnicom Group Inc. common stock in direct ownership.

At what price were the new Omnicom shares acquired in this Form 4?

The 634.68 shares of Omnicom Group Inc. common stock were acquired at a stated price of $0 per share, reflecting a deferred compensation election rather than an open-market purchase.

What plan governs the deferred Omnicom (OMC) shares in this transaction?

The director elected to defer receipt of the shares under the Omnicom Group Inc. 2021 Incentive Award Plan, which allows compensation to be taken in deferred stock.

How are dividends on the director’s deferred Omnicom shares treated?

According to the disclosure, dividends on deferred shares are reinvested in company stock; such dividends were credited on October 10, 2025 and are included in the 5,130.48 shares owned.

What is the reporting person’s relationship to Omnicom Group Inc. in this filing?

The reporting person is identified as a Director of Omnicom Group Inc. and is not indicated as a 10% owner in this Form 4.