GroupM

Formerly the world's largest media investment group by billings, now operating as WPP Media; commands unmatched scale in global media buying and planning

GroupM operated as WPP's unified media investment arm and the world's largest media buying and planning organization, overseeing more than $60 billion in annual media expenditure on behalf of some of the world's most prominent advertisers. Formed in 2003 to consolidate WPP's media agency operations, GroupM housed a portfolio of major agency brands — Mindshare, Wavemaker, EssenceMediacom, mSix&Partners, T&Pm, and Finecast — alongside data and technology unit Choreograph. Its scale gave it unparalleled negotiating leverage with media owners and platforms globally, making it a dominant force in shaping how advertising budgets were allocated across television, digital, out-of-home, and emerging channels. GroupM played a central role in the AdTech ecosystem by bridging the gap between major advertisers and the complex programmatic, data, and media landscape. Through Choreograph, it built first-party data infrastructure and audience intelligence capabilities to help clients navigate a post-cookie world. Finecast provided addressable TV solutions, while its agency brands offered full-service media planning, buying, and performance optimization. GroupM was consistently ranked as the top media investment group globally by RECMA and other industry trackers. In Q2 2025, as part of WPP CEO Cindy Rose's Elevate28 transformation strategy, GroupM was officially rebranded as WPP Media. The rebrand reflected a broader effort to more closely align the media investment group with WPP's corporate identity and streamline its go-to-market positioning. The underlying agency brands, capabilities, and operational structure carried forward under the new WPP Media name, with Mindshare, EssenceMediacom, Wavemaker, T&Pm, Choreograph, and Finecast all continuing to operate within the group.

• 2003Founded
• 2025Rebranded to WPP Media