10 Biggest Advertising Agencies In The US

1. Omnicom Group Inc. (NYSE:OMC)

While Interpublic has one iconic ad agency, Omnicom has two: BBDO (whose clients include GE, Lay’s, and ExxonMobil, among dozens of others, as well as Pepsi in the past) and DDB Worldwide (whose long client list includes McDonalds, Volkswagen, and Chlorox). Omnicom has the largest US revenues, at $8.53 billion, and would have been the largest ad agency company in the world if its ill-fated merger with Publicis Groupe of France had pushed through. On its own, Omnicom raked in $15.13 billion, putting it on top of our list of the 10 Biggest Advertising Agencies In The US.

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