Wikipedia
Publicis Groupe is a French multinational advertising and public relations company, headquartered in Paris. After 1945 the little-known Paris-based advertising agency grew rapidly, becoming the world's fourth-largest agency. It was a leader in promoting France's post- war economic boom, especially the expansion of the advertising industry; it was successful because of its close ties with top officials of the French government, its clever use of symbols to promote itself, and its ability to attract clients from widely diverse growing industries.
It is now one of the "Big Four" agency companies, alongside WPP, Interpublic and Omnicom. Publicis Groupe S.A. is presided by Maurice Lévy, and its agencies provide digital and traditional advertising, media services and marketing services (SAMS) to national and multinational clients.
Although it was announced in July 2013 that Publicis Groupe and Omnicom Group would merge to form Publicis Omnicom Group, by May 2014 it was announced that the deal had fallen through and the Publicis-Omnicom merger would not happen.