GroupM

Formerly the world's largest media investment company by spend, now operating as WPP Media under WPP plc

GroupM, now operating as WPP Media following its 2025 rebrand under WPP plc CEO Cindy Rose's Elevate28 strategy, was established as the world's largest media investment group, overseeing more than $60 billion in annual media spend on behalf of clients worldwide. As the media holding arm of WPP plc, GroupM housed some of the most prominent media agency brands in the industry, including Mindshare, Wavemaker, EssenceMediacom, mSix&Partners, T&Pm, Finecast, and the data and technology unit Choreograph. Its scale gave it unmatched leverage in media buying, audience intelligence, and cross-channel campaign execution across television, digital, out-of-home, and emerging media formats. Throughout its operational history, GroupM played a defining role in shaping global media investment practices, pioneering data-driven planning, programmatic buying, and brand safety standards. It served as a central resource for its constituent agencies, providing shared infrastructure in areas such as trading, research, digital ad operations, and technology partnerships. Its proprietary tools and market intelligence reports were widely cited benchmarks in the advertising industry. In Q2 2025, WPP plc officially rebranded GroupM as WPP Media, consolidating the group's identity more directly under the parent holding company as part of a broader strategic transformation. The same operating unit, agency brands, and capabilities continue under the WPP Media name, reflecting WPP's effort to streamline its structure and signal a unified go-to-market approach for its media investment businesses.