GroupM

Formerly the world's largest media investment group by spend; rebranded as WPP Media in 2025, retaining its position as the dominant global media buying and planning entity within WPP plc.

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 2023.¹ Its primary purpose was to maximize the performance of WPP's media agencies by operating as a leader and collaborator in trading, content creation, sports, digital, finance, and proprietary tool development, with a focus on delivering marketplace advantage to clients, stakeholders, and people.² Businesses owned and operated under GroupM included Essence Global, Mindshare, and Wavemaker, with EssenceMediacom serving as the world's largest media agency network.¹ GroupM's intelligence capabilities were built on harnessing trillions of data points across a decentralized network to generate predictive, brand-specific insights, with all operations connected and powered by AI to enable collaboration, speed, transparency, and creativity.³ The company offered advanced platform capabilities spanning scaled and integrated creative, production, data, commerce, and personalized media delivery, enabling brands to unify media, data, and production while holistically managing owned, earned, shared, and paid activities, backed by connected commerce, measurement, and analytics.³ GroupM was rebranded as WPP Media in May 2025, at which point EssenceMediacom, Mindshare, T&Pm, and Wavemaker ceased to operate as separate businesses.¹ Source 1: wikipedia.org — WPP Media Source 2: mmaglobal.com — GroupM Source 3: groupm.com — WPP Media Nordics