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IndustryAdvertising and marketing
Headquarters3 World Trade Center
New York, NY, U.S.
Number of employees
Over 32,000 (2018)
ParentWPP Group plc

GroupM is the world’s largest advertising media company in terms of billings. It is headquartered in New York City with over 32,000 employees and 400 offices in over 100 countries. GroupM was formed in 2003 by WPP Group to serve as the parent company of WPP's media agencies including Mindshare, MediaCom, Wavemaker, Greenhouse Group, Essence, m/SIX, QUISMA, Xaxis, Outrider, Catalyst, Quasar, Movent, Vocanic, and Plista. It handles over 32% of the world's media billings making it the world's largest media investment management operation. Kelly Clark is Global CEO of GroupM and manages the worldwide operations including the management of GroupM’s agencies worldwide.


Through its agencies, GroupM offers advertising media selection services including: media planning and media buying, branded content, digital media, ROI and consumer research, internet marketing (digital, direct, search), content creation, social media marketing, out-of-home advertising and entertainment, sponsorship and sports marketing.[1]

All of GroupM's agencies are independent global operations in their own right. GroupM works as a parent and collaborator in activities such as trading, content creation, digital advertising, finance, proprietary tool development and other business-critical capabilities.[2]



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