GroupM
RebrandedNew York, New York, United States · Founded 2003
10001+ employees
Sourced & current · updated Oct 26, 2026Website
GroupM, now rebranded as WPP Media, was a U.S.-based media business owned by the multinational holding company WPP plc and was the world's largest media buying agency as of 2023.
Where they sit
Stack tier: Core Platforms (S)
Attribution & AnalyticsMarketing AgencyProgrammatic Platform
Was the world's largest media buying agency group as of 2023, commanding a significant share of global media spend on behalf of WPP clients
Ownership
Parent: WPP plc