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Form 8-K

sec.gov

8-K — OMNICOM GROUP INC.

Accession: 0001213900-26-107282

Filed: 2026-10-06

Period: 2026-10-01

CIK: 0000029989

SIC: 7311 (SERVICES-ADVERTISING AGENCIES)

Item: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Documents

8-K — ea0307855-8k_omnicom.htm (Primary)

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8-K — CURRENT REPORT

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UNITED

STATES

SECURITIES

AND EXCHANGE COMMISSION

Washington,

D.C. 20549

Form

8-K

CURRENT

REPORT

Pursuant

to Section 13 or 15(d)

of

the Securities Exchange Act of 1934

Date

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

OMNICOM GROUP INC.

(Exact

name of registrant as specified in its charter)

New York

1-10551

13-1514814

(State

or other jurisdiction

of incorporation)

(Commission

File

Number)

(IRS

Employer

Identification No.)

280 Park Avenue, New York, NY

10017

(Address of principal

executive office)

(Zip

Code)

(212)

415-3600

(Registrant’s

telephone number, including area code)

Not

Applicable

(Former

name or former address, if changed since last report)

Check

the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under

any of the following provisions:

☐

Written communications pursuant

to Rule 425 under the Securities Act (17 CFR 230.425)

☐

Soliciting material pursuant to Rule 14a-12 under the

Exchange Act (17 CFR 240.14a-12)

☐

Pre-commencement communications pursuant to Rule 14d-2(b)

under the Exchange Act (17 CFR 240.14d-2(b))

☐

Pre-commencement communications pursuant to Rule 13e-4(c)

under the Exchange Act (17 CFR 240.13e-4(c))

Securities

registered pursuant to Section 12(b) of the Act:

Title

of each class

Trading

Symbol(s)

Name

of each exchange

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

of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

☐

Emerging growth company

If

an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying

with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 5.02.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain

Officers.

On

October 1, 2026, after a distinguished career including more than 25 years at Omnicom Group Inc. (the “Company”), Andrew

Castellaneta retired from his role as the Company’s Senior Vice President and Chief Accounting Officer, effective immediately.

Mr. Castellaneta will remain an employee of the Company for a period of time to facilitate a smooth transition. Mr. Castellaneta’s

retirement is not the result of any disagreement with the Company on any matter relating to the Company’s operations, policies

or practices.

On

October 1, 2026, the Company’s Board of Directors appointed Jordan Farnam as Vice President, Global Financial Reporting and Chief

Accounting Officer, effective immediately.

Mr.

Farnam, age 44, joined the Company in January 2024 as Vice President, Global Financial Reporting. Prior to joining the Company, he served

as the Corporate Controller for Consumer Edge LLC from 2022 to 2024 and Director, Technical Accounting for Spotify USA Inc. from 2020

to 2022. Mr. Farnam previously served in various roles at PricewaterhouseCoopers LLP, including as Assurance Director, with an emphasis

on serving technology and media multi-national clients in the U.S. and Finland.

1

SIGNATURE

Pursuant

to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by

the undersigned hereunto duly authorized.

OMNICOM GROUP INC.

Date: October 6, 2026

By:

/s/ Louis F.

Januzzi

Name:

Louis F. Januzzi

Title:

Senior Vice President, General Counsel and Secretary

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Entity Registrant Name

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Entity Central Index Key

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Entity Tax Identification Number

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Entity Incorporation, State or Country Code

NY

Entity Address, Address Line One

280 Park Avenue

Entity Address, City or Town

New York

Entity Address, State or Province

NY

Entity Address, Postal Zip Code

10017

City Area Code

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Local Phone Number

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Common Stock, par value $0.15 per share

Title of 12(b) Security

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Trading Symbol

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Security Exchange Name

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0.800% Senior Notes due 2027

Title of 12(b) Security

0.800% Senior Notes due 2027

Trading Symbol

OMC/27

Security Exchange Name

NYSE

1.400% Senior Notes due 2031

Title of 12(b) Security

1.400% Senior Notes due 2031

Trading Symbol

OMC/31

Security Exchange Name

NYSE

3.700% Senior Notes due 2032

Title of 12(b) Security

3.700% Senior Notes due 2032

Trading Symbol

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Security Exchange Name

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2.250% Senior Notes due 2033

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3.850% Senior Notes due 2034

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3.850% Senior Notes due 2034

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