Company Update

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 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): June 23, 2025     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 offices)   (Zip Code)   Registrant’s telephone number, including area code: ( 212 )  415-3600   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   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   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 8.01 Other Events.   On June 23, 2025, Omnicom Group Inc. issued the press release attached as Exhibit 99.1 hereto and incorporated herein by reference.   Item 9.01 Financial Statements and Exhibits.   (d) Exhibits   Exhibit No.   Description     99.1   Press Release, dated June 23, 2025     104   Cover Page Interactive Data File (formatted as inline XBRL and contained in Exhibit 101)   1     SIGNATURES   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: June 23, 2025       By: /s/ Louis F. Januzzi   Name:  Louis F. Januzzi   Title: Senior Vice President, General Counsel and Secretary   2