OMNICOM GROUP INC.

This Quarterly Report on Form 10-Q contains forward-looking statements, including statements within the meaning of the Private Securities Litigation Reform Act of 1995, as amended. In addition, from time to time, we or our representatives have made, or may make, forward-looking statements, orally or in writing. These statements may discuss goals, intentions and expectations as to future plans, trends, events, results of operations or financial condition, or otherwise, based on current beliefs of management as well as assumptions made by, and information currently available to management. Forward-looking statements may be accompanied by words such as “aim”, “anticipate”, “believe”, “plan”, “could”, “should”, “would”, “estimate”, “expect”, “forecast”, “future”, “guidance”, “intend”, “may”, “will”, “possible”, “potential”, “predict”, “project” or similar words, phrases or expressions. These forward-looking statements are subject to various risks and uncertainties, many of which are outside of our control. Therefore, you should not place undue reliance on such statements. Factors that could cause actual results to differ materially from those in the forward-looking statements include:

•risks relating to the completed merger (the “Merger”) between us and The Interpublic Group of Companies, Inc. ("IPG"), including risks related to the integration of IPG’s business, such as, among others: uncertainties associated with retaining key management and other employees; potential disruptions to client, vendor, and business partner relationships; the risk that integration activities may be more time-consuming, complex, or costly than expected; the possibility that anticipated synergies, efficiencies, and other benefits of the Merger may not be realized, or may be realized more slowly than anticipated; and risks associated with managing a larger, more complex combined organization and effectively integrating systems, processes, operations, and cultures;

•adverse economic conditions, including geopolitical events, international hostilities, acts of terrorism, public health crises, inflation or stagflation, tariffs and other trade barriers, central bank interest rate policies in countries that comprise our major markets, labor and supply chain issues affecting the distribution of our clients’ products, or a disruption in the credit markets;

•international, national or local economic conditions that could adversely affect us or our clients;

•reductions in client spending, a slowdown in client payments or a deterioration or disruption in the credit markets;

•the ability to attract new clients and retain existing clients in the manner anticipated;

•changes in client marketing and communications services requirements;

•failure to manage potential conflicts of interest between or among clients;

•unanticipated changes related to competitive factors in the marketing and communications services industries;

•unanticipated changes to, or an inability to hire and retain, key personnel;

•currency exchange rate fluctuations;

•reliance on information technology systems and risks related to cybersecurity incidents;

•effective management of the risks, challenges and efficiencies presented by utilizing artificial intelligence, or AI, technologies and related partnerships in our business, and their use by our competitors;

•failure to adapt to technological developments;

•our liquidity, long-term financing needs, credit ratings and access to capital markets;

•changes in legislation or governmental regulations affecting us or our clients;

•losses on media purchases and production costs incurred on behalf of clients;

•risks associated with assumptions we make in connection with our acquisitions, critical accounting estimates and legal proceedings;

•Our international operations, which are subject to the risks of currency repatriation restrictions, social or political conditions and an evolving regulatory environment in high-growth markets and developing countries;

•risks related to our environmental, social and governance goals and initiatives, including impacts from regulators and other stakeholders, and the impact of factors outside of our control on such goals and initiatives;

•changes in tax rates, tax laws, regulations or interpretations, or adverse outcomes of tax audits or proceedings; and

•other business, financial, operational and legal risks and uncertainties detailed from time to time in our filings with the Securities and Exchange Commission ("SEC").

The foregoing list of factors is not exhaustive. You should carefully consider the foregoing factors and the other risks and uncertainties that may affect the Company’s business, including those described in Item 1A, “Risk Factors” and Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our Annual Report on Form 10-K for the year ended December 31, 2025 (the "2025 10-K"), and in Item 2, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in this report and in other documents filed from time to time with the Securities and Exchange Commission. Except as required under applicable law, we do not assume any obligation to update these forward-looking statements.