GroupM

World's largest media investment company by billings

GroupM is WPP's media investment group and the world's leading media investment company. It operates as a parent organization to several major media agencies including Mindshare, Wavemaker, EssenceMediacom (formed from Essence and MediaCom), and mSix&Partners. GroupM manages media investments for some of the world's largest advertisers, handling over $60 billion in annual media spend across all platforms and markets. The company provides end-to-end media services including media planning and buying, audience insights, data analytics, programmatic advertising, and performance optimization. GroupM leverages its massive scale to negotiate favorable rates with media owners and platforms while providing clients access to proprietary technology platforms like Choreograph (data and analytics), Xaxis (programmatic), and GroupM Nexus (performance media). The company operates in over 90 markets worldwide and serves major global brands across all industries. GroupM's significance in the AdTech ecosystem stems from its unparalleled buying power, advanced data capabilities, and role in shaping industry standards around transparency, brand safety, and measurement. The company has been at the forefront of addressing key industry challenges including ad fraud, viewability standards, and the transition away from third-party cookies.