Omnicom is the biggest rival of IPG. Omnicom was founded in 1986, and its headquarters is in New York, New York. Omnicom operates in the industry. Omnicom has 16,100 more employees than IPG.
Publicis Groupe has been one of IPG's top competitors. Publicis Groupe is a Public company that was founded in Paris, Île-de-France in 1926. Publicis Groupe is in the industry. Publicis Groupe has 40,400 more employees vs. IPG.