Omnicom director Gerstein acquires 696 and 306 shares

The director elected to defer receipt under Omnicom’s 2026 Incentive Award Plan; one share amount represents a quarterly annual-retainer payment.

Rhea-AI Filing Summary

Omnicom Group Inc. director Mark D. Gerstein reported direct acquisitions of 696 shares and 306 shares of common stock on October 1, 2026. He elected to defer receipt of both amounts under the company’s 2026 Incentive Award Plan; the 306 shares represent a quarterly payment of his annual retainer. The reported amounts include dividends on deferred shares reinvested in company stock and credited July 9, 2026.

Insider Trade Summary

Grant/Award: 1,001.63 shares

Grant/Award 2 txns

Insider Gerstein Mark D

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock, par value $0.15 per share F1, F3	696.05	$0.00	$0.00
Grant/Award	Common Stock, par value $0.15 per share F2, F3	305.58	$0.00	$0.00

Holdings After Transaction: Common Stock, par value $0.15 per share — 17,485.02 shares (Direct)

Footnotes (3)

1. F1. The reporting person elected to defer receipt of these shares under the terms of the Omnicom Group Inc. 2026 Incentive Award Plan.
2. F2. The reporting person elected to defer receipt of these shares, which represent a quarterly payment of his annual retainer, under the terms of the Omnicom Group Inc. 2026 Incentive Award Plan.
3. F3. Includes dividends on deferred shares that are reinvested in company stock, credited on July 9, 2026.

Key Figures

Common shares acquired: 696 shares Common shares acquired: 306 shares Dividend credit date: July 9, 2026

3 metrics

Common shares acquired 696 shares Direct acquisition on October 1, 2026; receipt deferred under the 2026 Incentive Award Plan

Common shares acquired 306 shares Direct acquisition on October 1, 2026; quarterly payment of the annual retainer

Dividend credit date July 9, 2026 Dividends on deferred shares reinvested in company stock

Key Terms

defer receipt, annual retainer, reinvested in company stock

3 terms

defer receipt financial

"elected to defer receipt of these shares"

annual retainer financial

"quarterly payment of his annual retainer"

reinvested in company stock financial

"dividends on deferred shares that are reinvested in company stock"

FAQ

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How many OMC shares did director Mark D. Gerstein acquire?

Mark D. Gerstein reported direct acquisitions of 696 shares and 306 shares of common stock on October 1, 2026, with receipt deferred under Omnicom Group Inc.’s 2026 Incentive Award Plan.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/05/2026 - 04:31 PM Accepted by SEC EDGAR 10/05/2026 - 04:30 PM Learn about SEC filing dates

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^*

Gerstein Mark D

(Last) (First) (Middle)

C/O OMNICOM GROUP INC.

280 PARK AVENUE

(Street)

NEW YORK NEW YORK 10017

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2026

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

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

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

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	10/01/2026		A		696.05(1)	A	$0	17,179.44(3)	D
Common Stock, par value $0.15 per share	10/01/2026		A		305.58(2)	A	$0	17,485.02(3)	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. 2026 Incentive Award Plan.

2. The reporting person elected to defer receipt of these shares, which represent a quarterly payment of his annual retainer, under the terms of the Omnicom Group Inc. 2026 Incentive Award Plan.

3. Includes dividends on deferred shares that are reinvested in company stock, credited on July 9, 2026.

	/s/ Eric J. Cleary, Attorney in Fact for Mark D. Gerstein	10/05/2026
	** 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.
* Form 4: SEC 1474 (03-26)