Digiday, MediaPost Examine Evidence in Foster Amended Complaint

Coverage of Richard Foster's amended complaint continued at Digiday and MediaPost. Foster, the former CEO of WPP's Motion Content Group, alleges that WPP improperly retained value generated by clients' advertising spend. The amended complaint further alleges that Sony Group Corporation, one of WPP's largest clients, launched an independent investigation into those practices.

Digiday reported on what it described as WPP's stalled turnaround, detailing former executives' accounts of "the transformation that never was," due to organizational problems and major client departures. Digiday connected those accounts to the new allegations surrounding Sony's investigation.

MediaPost dug into the evidence cited in Foster's amended complaint, including the financial records, internal emails, and WPP tracking documents allegedly presented by Sony — highlighting the complaint's allegations that WPP representatives had "no answer to give" when confronted with "black box" rebates funding media discounts.

The amended complaint in Foster v. WPP was filed on August 13, 2026 in the Supreme Court of the State of New York, New York County (Index No. 659721/2025). Lead counsel for Foster is William A. Brewer III, a partner at Brewer, Attorneys & Counselors.

Read the Digiday article on new court filings and WPP's stalled turnaround.

Read the MediaPost article on Foster's amended complaint and Sony's investigation.