Major holding companies are bracing for the potential impact of new tariffs, with leaders from WPP and Omnicom directly acknowledging growing uncertainty, while IPG and Publicis emphasized broader macroeconomic volatility without specifically citing tariffs.Major holding companies are bracing for the potential impact of new tariffs, with leaders from WPP and Omnicom directly acknowledging growing uncertainty, while IPG and Publicis emphasized broader macroeconomic volatility without specifically citing tariffs. Read More