Third Quarter 2019 Results

Reconciliation of 2018 Non-GAAP Financial Measures Net Income - Omnicom Group Inc. Net Income - Omnicom Group Inc., as reported Net gain from dispositions before income tax expense Repositioning actions - Incremental Severance and other items, before income tax expense Repositioning actions - Lease terminations, before income tax expense Income tax benefit on repositioning actions, less income tax expense on net gain from dispositions Allocation of above items to non-controlling interests Increase in income tax expense for revision of provisional estimates in connection with the adoption of 2017 Tax Act Net Income - Omnicom Group Inc., 2018 Non-GAAP Adjusted Three Months Ended September 30, 2018 OmnicomGroup SA 298.9 $ (178.4) 75.9 73.5 (25.0) 6.9 Nine Months Ended September 30, 2018 28.9 280.7 $ 927.2 October 15, 2019 (178.4) 75.9 73.5 (25.0) 6.9 28.9 The above table reconciles the U.S. GAAP financial measure of Net Income - Omnicom Group Inc. to the non-GAAP financial measure of Net Income - Omnicom Group Inc. Non-GAAP 2018 Adjusted, which excludes the impact of the net gain recognized on dispositions of certain subsidiaries, certain repositioning actions and the revision of the provisional income tax expense amounts recorded in connection with the enactment of the 2017 Tax Act, for the periods presented. We believe that the amounts presented in "Non-GAAP 2018 Adjusted" figures are useful measures for investors to understand the impact these items had on our reported results. Non-GAAP financial measures should not be considered in isolation from, or as a substitute for, financial information presented in compliance with U.S. GAAP. Non- GAAP financial measures reported by us may not be comparable to similarly titled amounts reported by other companies. 909.0 31

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