GroupM
RebrandedNew York, New York, United States · Founded 2003
10001+ employees
Sourced & current · updated Jul 13, 2026Website
GroupM is the world's largest media investment company, managing over $60 billion in annual media spend across multiple agency brands including Mindshare, Wavemaker, EssenceMediacom, and mSix&Partners.
Where they sit
Stack tier: Core Platforms (S)
Attribution & AnalyticsMarketing AgencyProgrammatic Platform
Formerly the world's largest media investment company by spend, now operating as WPP Media under WPP's Elevate28 strategy
Ownership
Parent: WPP plc
Subsidiaries