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UNITED\nSTATES

SECURITIES\nAND EXCHANGE COMMISSION

Washington,\nD.C. 20549

Form\n8-K

CURRENT\nREPORT

Pursuant\nto Section 13 or 15(d)

of\nthe Securities Exchange Act of 1934

Date\nof Report (Date of earliest event reported): October 1, 2026

OMNICOM GROUP INC.

(Exact\nname of registrant as specified in its charter)

\n \n \n \n \n \n \n \n \n \n \n \n \n

New York

1-10551

13-1514814

(State\n or other jurisdiction
\n of incorporation)

(Commission

File\n Number)

(IRS\n Employer
\n Identification No.)

\n \n \n \n \n \n \n \n \n

280 Park Avenue, New York, NY		10017
(Address of principal\n executive office)		(Zip\n Code)

(212)\n415-3600

(Registrant’s\ntelephone number, including area code)

Not\nApplicable

(Former\nname or former address, if changed since last report)

Check\nthe appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under\nany of the following provisions:

\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

☐	Written communications pursuant\n to Rule 425 under the Securities Act (17 CFR 230.425)

☐	Soliciting material pursuant to Rule 14a-12 under the\n Exchange Act (17 CFR 240.14a-12)

☐	Pre-commencement communications pursuant to Rule 14d-2(b)\n under the Exchange Act (17 CFR 240.14d-2(b))

☐	Pre-commencement communications pursuant to Rule 13e-4(c)\n under the Exchange Act (17 CFR 240.13e-4(c))

Securities\nregistered pursuant to Section 12(b) of the Act:

\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

Title\n of each class	Trading \n Symbol(s)	Name\n of each exchange \n on which registered
Common Stock, par value $0.15 per share	OMC	New York Stock Exchange
0.800% Senior Notes due 2027	OMC/27	New York Stock Exchange
1.400% Senior Notes due 2031	OMC/31	New York Stock Exchange
3.700% Senior Notes due 2032	OMC/32	New York Stock Exchange
2.250% Senior Notes due 2033	OMC/33	New York Stock Exchange
3.850% Senior Notes due 2034	OMC/34	New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405\nof this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

☐\nEmerging growth company

If\nan emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying\nwith any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 5.02.\nDeparture of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain\nOfficers.

On\nOctober 1, 2026, after a distinguished career including more than 25 years at Omnicom Group Inc. (the “Company”), Andrew\nCastellaneta retired from his role as the Company’s Senior Vice President and Chief Accounting Officer, effective immediately.\nMr. Castellaneta will remain an employee of the Company for a period of time to facilitate a smooth transition. Mr. Castellaneta’s\nretirement is not the result of any disagreement with the Company on any matter relating to the Company’s operations, policies\nor practices.

On\nOctober 1, 2026, the Company’s Board of Directors appointed Jordan Farnam as Vice President, Global Financial Reporting and Chief\nAccounting Officer, effective immediately.

Mr.\nFarnam, age 44, joined the Company in January 2024 as Vice President, Global Financial Reporting. Prior to joining the Company, he served\nas the Corporate Controller for Consumer Edge LLC from 2022 to 2024 and Director, Technical Accounting for Spotify USA Inc. from 2020\nto 2022. Mr. Farnam previously served in various roles at PricewaterhouseCoopers LLP, including as Assurance Director, with an emphasis\non serving technology and media multi-national clients in the U.S. and Finland.

SIGNATURE

Pursuant\nto the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by\nthe undersigned hereunto duly authorized.

\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

	OMNICOM GROUP INC.

Date: October 6, 2026	By:	/s/ Louis F.\n Januzzi
	Name:	Louis F. Januzzi
	Title:	Senior Vice President, General Counsel and Secretary

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