Modified

On November 26, 2025 (the “Closing Date”), Omnicom completed its Merger with IPG (the “Merger”). As previously reported, on December 8, 2024, Omnicom entered into an Agreement and Plan of Merger, or (the “Merger Agreement, by ”) with IPG and among Omnicom, EXT Subsidiary Inc., a Delaware corporation and a direct wholly owned subsidiary of Omnicom, or (“Merger Sub, and IPG, pursuant to which”). On the Closing Date, subjectpursuant to the terms and conditions of the Merger Agreement, Merger Sub will merge merged with and into IPG, or the Merger, with IPG surviving continuing as the Merger as surviving corporation and a direct wholly owned subsidiary of Omnicom. UnderUpon the terms of the Merger Agreement,Merger, each outstanding share of IPG shareholders will common stock (other than certain excluded shares) converted into the right to receive 0.344 shares of Omnicom common stock for each share and cash in lieu of IPG common stock they ownfractional shares. Following the closeclosing of the Merger, legacy Omnicom shareholders are expected to own owned approximately 60.6% of the combined company and legacy IPG shareholders are expected to own owned approximately 39.4%, on a fully diluted basis. The completion of the Merger is subject (see Note 5 to customary closing conditions, including required regulatory approvals and the approval of the stockholders of both Omnicom and IPG. If completed, the Merger is expected to have a material impact on our business, results of operations and consolidated financial conditionstatements).