Shareholder Vote

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): May 5, 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 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 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 5.07. Submission of Matters to a Vote of Security Holders.   (a) Omnicom Group Inc. (the “Company”) held its annual meeting of shareholders (the “Annual Meeting”) on May 5, 2026. At the Annual Meeting, the Company’s shareholders (i) elected 14 individuals to the Board of Directors of the Company (the “Board”), (ii) approved an advisory resolution to approve executive compensation, and (iii) ratified the appointment of KPMG LLP as the Company’s independent auditors for the fiscal year ending December 31, 2026. The proposals are described in more detail in the Company’s definitive proxy statement on Schedule 14A filed with the Securities and Exchange Commission on March 26, 2026 (the “Proxy Statement”).   (b) Proposal 1   The Company’s shareholders elected 14 individuals to the Board as set forth below:   Name   Votes For     Votes Against     Abstentions     Broker Non-Votes   John D. Wren     227,927,526       14,252,670       119,536       17,803,205   Mary C. Choksi     231,053,749       11,085,158       160,825       17,803,205   Leonard S. Coleman, Jr.     226,474,968       15,619,733       205,031       17,803,205   Mark D. Gerstein     241,132,014       974,080       193,638       17,803,205   Ronnie S. Hawkins     234,462,854       7,631,361       205,517       17,803,205   Deborah J. Kissire     235,500,505       6,603,733       195,494       17,803,205   Philippe Krakowsky     238,617,961       3,523,140       158,631       17,803,205   Gracia C. Martore     231,386,212       10,705,439       208,081       17,803,205   Patrick Q. Moore     241,177,113       952,411       170,208       17,803,205   Patricia Salas Pineda     238,728,349       3,342,061       229,322       17,803,205   Linda Johnson Rice     228,421,638       13,668,644       209,450       17,803,205   Cassandra Santos     239,020,874       3,089,071       189,787       17,803,205   Valerie M. Williams     232,910,542       9,205,607       183,583       17,803,205   E. Lee Wyatt Jr.     241,116,022       1,020,048       163,662       17,803,205     Proposal 2   The Company’s shareholders approved an advisory resolution on the compensation of the Company’s named executive officers as reported in the Proxy Statement.   Votes For   Votes Against   Abstentions   Broker Non-Votes 136,696,153   104,956,047   647,532   17,803,205   Proposal 3   The Company’s shareholders ratified the appointment of KPMG LLP as the Company’s independent auditors for the fiscal year ending December 31, 2026.   Votes For   Votes Against   Abstentions 250,249,015   9,733,072   120,850   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: May 8, 2026       By: /s/ Louis F. Januzzi   Name: Louis F. Januzzi   Title: Senior Vice President, General Counsel and Secretary   2