This document provides a list and overview of the top global advertising agencies as ranked by estimated worldwide annual revenues and other key metrics. The top agencies include WPP, Omnicom Group, Publicis Groupe, Interpublic Group, Dentsu, Havas and more. Details on each agency's revenue, office locations and major clients are included.

29. http://www.adbrands.net/agencies_index.htm

31. Top Ad Agencies
http://www.adbrands.net/top_advertising_agencies_index.htm

32. Source: Adage.com