The $100 million whistleblower lawsuit Richard Foster filed against WPP last November is back in focus. New court filings — including WPP’s motion to dismiss and exhibits that place Foster’s own internal documents into the public record for the first time — have added significant texture to both sides of a case that initial headlines only scratched the surface of.
Most notably among the exhibits is Foster’s own internal report to GroupM CEO Brian Lesser, which contains internal data on client opt-in rates, platform spend, and income targets that haven’t been public until now. The materials were first reported by The Times.
Before unpacking those materials, here’s a recap of how the case reached this point.
Who’s suing whom
Foster spent 17 years at GroupM, ending as global CEO of Motion Content Group — the division that co-produced Love Island, managed roughly $500 million in annual entertainment investment, and by his own filed data was posting 140% US revenue growth in his final year. He was fired on July 10, 2025, the day after WPP’s stock dropped 18% on a trading update disclosing serious deterioration at WPP Media. He filed suit in November 2025 against WPP and GroupM (since rebranded WPP Media), seeking at least $100 million, Business Insider reported.
Foster claims GroupM, which according to the complaint controlled roughly $60 billion in annual client ad spend at its peak, ran a hidden profit center by systematically retaining rebates that...
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