Presentation of Financial Statements	6 Months Ended
Jun. 30, 2026
Presentation of Financial Statements [Abstract]
Presentation of Financial Statements	Presentation of Financial Statements The terms “Omnicom”, “the Company”, “we”, “our” and “us” each refer to Omnicom Group Inc. and its subsidiaries, unless the context indicates otherwise. The accompanying unaudited consolidated financial statements were prepared in accordance with generally accepted accounting principles in the United States ("U.S. GAAP" or "GAAP"), for interim financial information and Article 10 of Regulation S-X of the Securities and Exchange Commission, ("SEC"). Accordingly, certain information and footnote disclosures have been condensed or omitted. All intercompany balances and transactions have been eliminated. The preparation of financial statements in conformity with U.S. GAAP requires us to make estimates and assumptions that affect the amounts reported in the unaudited consolidated financial statements and accompanying notes. Actual results could differ from those estimates and assumptions. Unless otherwise noted, dollars in tables are in millions, except per share amounts. In our opinion, the accompanying unaudited consolidated financial statements reflect all adjustments, consisting of normal recurring accruals, considered necessary for a fair presentation, in all material respects, of the information contained herein. These unaudited consolidated financial statements should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2025 (the "2025 10-K"). Results for the interim periods are not necessarily indicative of results that may be expected for the year. Merger with IPG On November 26, 2025 (the “Closing Date”), Omnicom completed its merger (the "Merger") with The Interpublic Group of Companies, Inc. ("IPG"). Omnicom is the acquirer of IPG under U.S. GAAP and as a result, the consolidated financial statements of Omnicom for periods prior to the Closing Date do not include the results of operations, financial position, or cash flows of IPG. The results of operations of IPG are included in Omnicom’s consolidated financial statements only from the Closing Date forward. Accordingly, Omnicom’s results of operations, financial condition and cash flows are not comparable to historical periods due to the inclusion of IPG’s results from the Closing Date. See Note 5 to the consolidated financial statements for more information related to the Merger. For the three and six months ended June 30, 2026, we recorded $40.1 million and $99.5 million, respectively, of integration and acquisition related costs related to the Merger in selling, general and administrative expenses. During the three and six months ended June 30, 2025, we recorded $66.0 million and $99.8 million, respectively, of acquisition related costs related to the Merger in selling, general and administrative expenses. The results of IPG are not included in our 2025 results of operations. Risks and Uncertainties Global economic disruptions, 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 our major markets, and labor or supply chain challenges, could contribute to economic uncertainty and volatility. The impact of these conditions on our business may vary by geographic market and service discipline. We monitor macroeconomic conditions, client revenue levels, and other relevant factors and may take actions to align our cost structure with changes in client demand and to manage working capital. However, there can be no assurance that such actions will be sufficient to mitigate the effects of adverse economic conditions, reductions in client spending, changes in client creditworthiness, or other developments.

The terms “Omnicom”, “the Company”, “we”, “our” and “us” each refer to Omnicom Group Inc. and its subsidiaries, unless the context indicates otherwise. The accompanying unaudited consolidated financial statements were prepared in accordance with generally accepted accounting principles in the United States ("U.S. GAAP" or "GAAP"), for interim financial information and Article 10 of Regulation S-X of the Securities and Exchange Commission, ("SEC"). Accordingly, certain information and footnote disclosures have been condensed or omitted. All intercompany balances and transactions have been eliminated. The preparation of financial statements in conformity with U.S. GAAP requires us to make estimates and assumptions that affect the amounts reported in the unaudited consolidated financial statements and accompanying notes. Actual results could differ from those estimates and assumptions. Unless otherwise noted, dollars in tables are in millions, except per share amounts.

In our opinion, the accompanying unaudited consolidated financial statements reflect all adjustments, consisting of normal recurring accruals, considered necessary for a fair presentation, in all material respects, of the information contained herein. These unaudited consolidated financial statements should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2025 (the "2025 10-K"). Results for the interim periods are not necessarily indicative of results that may be expected for the year.

On November 26, 2025 (the “Closing Date”), Omnicom completed its merger (the "Merger") with The Interpublic Group of Companies, Inc. ("IPG"). Omnicom is the acquirer of IPG under U.S. GAAP and as a result, the consolidated financial statements of Omnicom for periods prior to the Closing Date do not include the results of operations, financial position, or cash flows of IPG. The results of operations of IPG are included in Omnicom’s consolidated financial statements only from the Closing Date forward. Accordingly, Omnicom’s results of operations, financial condition and cash flows are not comparable to historical periods due to the inclusion of IPG’s results from the Closing Date. See Note 5 to the consolidated financial statements for more information related to the Merger.

For the three and six months ended June 30, 2026, we recorded $40.1 million and $99.5 million, respectively, of integration and acquisition related costs related to the Merger in selling, general and administrative expenses.

During the three and six months ended June 30, 2025, we recorded $66.0 million and $99.8 million, respectively, of acquisition related costs related to the Merger in selling, general and administrative expenses. The results of IPG are not included in our 2025 results of operations.

Global economic disruptions, 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 our major markets, and labor or supply chain challenges, could contribute to economic uncertainty and volatility. The impact of these conditions on our business may vary by geographic market and service discipline. We monitor macroeconomic conditions, client revenue levels, and other relevant factors and may take actions to align our cost structure with changes in client demand and to manage working capital. However, there can be no assurance that such actions will be sufficient to mitigate the effects of adverse economic conditions, reductions in client spending, changes in client creditworthiness, or other developments.