GroupM

S · Core PlatformsRebranded

London, England, United Kingdom · Founded 2003

10001+ employees

Sourced & current · updated Aug 31, 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 plc

Ownership

Parent: WPP plc

Subsidiaries

Essence

Mediacom

Competitors

Havas Media

S

Stagwell Media Network

In their space

• BBC shutdown1 sourceShutdown