Which company is part of the WPP Family Tree?

GroupM is part of the WPP Family Tree because it operates as WPP's media investment management arm, overseeing a comprehensive portfolio of media agencies and services that maximize client investments in the media space. WPP is one of the largest advertising conglomerates in the world, and GroupM functions as a central entity that integrates various media capabilities under its umbrella, supporting the overarching goals of WPP.

In contrast, OMD and PHD are part of the Omnicom Group, while BBDO is also a subsidiary of Omnicom. These agencies operate independently from the WPP structure and do not have the same affiliations with WPP as GroupM does. Thus, GroupM's connection to WPP is a defining characteristic that establishes its membership within the WPP Family Tree.