OMC · Omnicom Group Inc. · Debt

This Security is one of a duly authorized issue of securities of the Issuer, designated as its 5.400% Senior Notes due 2048 (herein called the “Securities”), issued and to be issued in one or more Series under an Indenture, dated as of February 21, 2020 (the “Base Indenture”), between the Issuer and Deutsche Bank Trust Company Americas, as Trustee (herein called the “Trustee,” which term includes any successor trustee under the Indenture), as supplemented by the Fifth Supplemental Indenture dated as of December 2, 2025, between the Issuer and the Trustee (the “Fifth Supplemental Indenture” and, together with the Base Indenture, the “Indenture”), to which Indenture and all indentures supplemental thereto reference is hereby made for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Issuer, the Trustee and the Holders of the Securities and of the terms upon which the Securities are, and are to be, authenticated and delivered. This Security is one of the Series designated on the face hereof, initially limited in aggregate principal amount to $[\_\_\_]. Capitalized terms used in this Security and not defined herein have the meaning ascribed thereto in the Indenture.

Issuer evidence: Fifth Supplemental Indenture dated as of December 2, 2025 (the “Fifth Supplemental Indenture”) between Omnicom Group Inc., a New York corporation (the “Issuer”) and Deutsche Bank Trust Company Americas, a New York banking corporation, as Trustee (the “Trustee”).

Supporting evidence: OMNICOM GROUP INC., a New York corporation (the “Issuer,” which term includes any successor person under the Indenture hereinafter referred to), for value received, hereby promises to pay to CEDE & CO., or registered assigns, the principal sum of $[\_\_\_] on October 1, 2048 and to pay interest thereon from the last interest payment date on which interest was paid or, if no interest has been paid, from October 1, 2025 semi-annually on April 1 and October 1 in each year, commencing April 1, 2026, at the rate of 5.400% per annum, set forth below. The interest so payable, and punctually paid or duly provided for, on any interest payment date shall, as provided in such Indenture, be paid to the person in whose name this Security (or one or more predecessor securities) is registered at the close of business on the regular record date for such interest, which shall be March 15 and September 15 (whether or not a Business Day), as the case may be, next preceding such interest payment date. Any such interest not so punctually paid or duly provided for shall forthwith cease to be payable to the Holder on such regular record date and may either be paid to the person in whose name this Security (or one or more predecessor securities) is registered at the close of business on a special record date for the payment of such defaulted interest to be fixed by the Trustee, notice whereof shall be given to Holders of Securities of this Series not less than 10 days prior to such special record date, or be paid at any time in any other lawful manner not inconsistent with the requirements of any securities exchange on which the Securities of this Series may be listed, and upon such notice as may be required by such exchange, all as more fully provided in said Indenture).

Supporting evidence: This Security is one of a duly authorized issue of securities of the Issuer, designated as its 5.400% Senior Notes due 2048 (herein called the “Securities”), issued and to be issued in one or more Series under an Indenture, dated as of February 21, 2020 (the “Base Indenture”), between the Issuer and Deutsche Bank Trust Company Americas, as Trustee (herein called the “Trustee,” which term includes any successor trustee under the Indenture), as supplemented by the Fifth Supplemental Indenture dated as of December 2, 2025, between the Issuer and the Trustee (the “Fifth Supplemental Indenture” and, together with the Base Indenture, the “Indenture”), to which Indenture and all indentures supplemental thereto reference is hereby made for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Issuer, the Trustee and the Holders of the Securities and of the terms upon which the Securities are, and are to be, authenticated and delivered. This Security is one of the Series designated on the face hereof, initially limited in aggregate principal amount to $[\_\_\_]. Capitalized terms used in this Security and not defined herein have the meaning ascribed thereto in the Indenture.

Supporting evidence: This Security is one of a duly authorized issue of securities of the Issuer, designated as its 5.400% Senior Notes due 2048 (herein called the “Securities”), issued and to be issued in one or more Series under an Indenture, dated as of February 21, 2020 (the “Base Indenture”), between the Issuer and Deutsche Bank Trust Company Americas, as Trustee (herein called the “Trustee,” which term includes any successor trustee under the Indenture), as supplemented by the Fifth Supplemental Indenture dated as of December 2, 2025, between the Issuer and the Trustee (the “Fifth Supplemental Indenture” and, together with the Base Indenture, the “Indenture”), to which Indenture and all indentures supplemental thereto reference is hereby made for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Issuer, the Trustee and the Holders of the Securities and of the terms upon which the Securities are, and are to be, authenticated and delivered. This Security is one of the Series designated on the face hereof, initially limited in aggregate principal amount to $[\_\_\_]. Capitalized terms used in this Security and not defined herein have the meaning ascribed thereto in the Indenture.