Publicis Groupe S.A. is a French multinational advertising and public relations company. As of 2024, the company is the largest advertising company in the world by revenue. Based in Paris, it is one of the 'Big Four' advertising commpanies, alongside WPP, Interpublic and Omnicom. Publicis Groupe S.A. is headed by Arthur Sadoun, and its agencies provide digital and traditional advertising, media services and marketing services to national and multinational clients. Wikipedia