Book size: 1000; First Pay: 2026-05-02; Registration: SEC Registered; Comments: CoC: 101%;

Reoffer: 8yr: MS+125bp / 99.872 / 3.870% Benchmark: 8yr: DBR 2.2 15-Feb-34 @ 97.380 / B+130.2bp / HR 98% IPTs: 8yr: MS+155/160bp Issuer: Omnicom Finance Holdings plc Guarantor: Omnicom Group Inc. (Ticker: OMC; Country: US) LEI: 213800JBHE39OG74OJ98 Issuer Ratings: Baa1 (Stable) / BBB+ (Stable) (Moody's/S&P) Expected Issue Ratings: Baa1 / BBB+ (Moody's/S&P) Format: Senior Unsecured Notes; SEC Registered Size: €600m Maturity: 02-May-34 Reoffer: MS+125bp / 99.872 / 3.870% Benchmark: DBR 2.2 15-Feb-34 + 130.2 (97.380) / HR 98% Coupon: 3.85% Fixed, Annual Act/Act (ICMA) Short first coupon MWC: Yes (B+20) Par Call: Yes, 3-month ISIN / Common Code: XS3308064354 / 330806435 B&D: Deutsche Bank Docs: SEC Registered / NYSE Listing / New York Law Clearing: Euroclear and Clearstream Change of Control: 101% Denominations: €100,000 x €1,000 Selling Restrictions: As per the Issuer's Preliminary Prospectus Supplement UoP: OMC intends to use the net proceeds from the sale of the notes offered hereby for general corporate purposes, which could include working capital expenditures, fixed asset expenditures, acquisitions, repayment of commercial paper and short-term debt, refinancing of other debt, repurchases of its common stock or other capital transactions. Pending the application of the net proceeds, OMC may invest such net proceeds in short-term investment grade obligations. Sales into Canada: Yes, via exemption Sales into Japan: Yes, via exemption Stabilization: Relevant stabilization regulations including FCA/ICMA apply Target Market: MiFID II and UK MiFIR - professionals/ECPs-only / No PRIIPs or UK PRIIPs key information document (KID) – Manufacturer target market (MiFID II and UK MiFIR product governance) is eligible counterparties and professional clients only (all distribution channels). No PRIIPs KID or UK PRIIPs KID has been prepared as the notes are not available to retail investors in the European Economic Area or the UK. Joint Global Coordinators: Citigroup / Deutsche Bank Joint Active Bookrunners: BNP Paribas / Citigroup / Deutsche Bank / HSBC TOE/FTT: TOE 15.47 UKT / FTT @ 07.30 UKT Settle: 02-Mar-26 (T+3)

Omnicom Group Inc

General corporate purposes, which could include working capital expenditures, fixed asset expenditures, acquisitions, repayment of commercial paper and short-term debt, refinancing of other debt, repurchases of its common stock or other capital transactions. Pending the application of the net proceeds, OMC may invest such net proceeds in short-term investment grade obligations.