Transforming Marketing

DISCLAIMER Forward-looking statements involve inherent risks and uncertainties. A number of important factors could cause actual results to differ materially from those contained in any forward-looking statements. Such risk factors include, but are not limited to, the following: • ° • risks associated with international, national and regional unfavorable economic conditions that could affect the Company or its clients; the continued impact of the coronavirus pandemic ("COVID-19"), and evolving strains of COVID-19 on the economy and demand for the Company's services, which may precipitate or exacerbate other risks and uncertainties; inflation and actions taken by central banks to counter inflation; the Company's ability to attract new clients and retain existing clients; the impact of a reduction in client spending and changes in client advertising, marketing and corporate communications requirements; financial failure of the Company's clients; the Company's ability to retain and attract key employees; the Company's ability to compete in the markets in which it operates; the Company's ability to achieve its cost saving initiatives; the Company's implementation of strategic initiatives; the Company's ability to remain in compliance with its debt agreements and the Company's ability to finance its contingent payment obligations when due and payable, including but not limited to those relating to redeemable noncontrolling interests and deferred acquisition consideration; the Company's ability to manage its growth effectively, including the successful completion and integration of acquisitions that complement and expand the Company's business capabilities; the Company's ability to develop products incorporating new technologies, including augmented reality, artificial intelligence, and virtual reality, and realize benefits from such products; an inability to realize expected benefits of the combination of the Company's business with the business of MDC Partners Inc. ("MDC"); adverse tax consequences in connection with the combination of MDC and Stagwell Marketing Group LLC and its direct and indirect subsidiaries (the "Transactions") for the Company, its operations and its shareholders, that may differ from the expectations of the Company, including that future changes in tax law, potential increases to corporate tax rates in the United States and disagreements with the tax authorities on the Company's determination of value and computations of its attributes may result in increased tax costs; the occurrence of material Canadian federal income tax (including material "emigration tax") as a result of the Transactions; the Company's unremediated material weaknesses in internal control over financial reporting and its ability to establish and maintain an effective system of internal control over financial reporting; the Company's ability to protect client data from security incidents or cyberattacks; economic disruptions resulting from war and other geopolitical tensions (such as the ongoing military conflict between Russia and Ukraine), terrorist activities and natural disasters; stock price volatility; and foreign currency fluctuations. Investors should carefully consider these risk factors and the additional risk factors outlined in more detail in the Company's filings with the SEC, including the Company's Annual Report on Form 10-K for the year ended December 31, 2022. 2

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