The WPP Lawsuit: Foster, Media Rebates, and Project Claridges

The WPP whistleblower lawsuit is a $100 million retaliation and wrongful termination case filed in November 2025 by Richard Foster, a 17-year company veteran and former global CEO of WPP’s Motion Content Group, who alleges he was fired after warning internally that WPP’s media-buying arm GroupM (now rebranded WPP Media) was keeping billions of dollars in media rebates that should have gone back to advertising clients.¹²

Who Filed the Suit and Against Whom

Richard Foster spent close to two decades at WPP, one of the world’s largest advertising and media holding companies. He led Motion Content Group, the division behind roughly 2,500 television programs globally, including the reality franchise Love Island.² Foster launched Motion Content Group in 2017 as a relaunch of GroupM Entertainment, with the stated aim of operating independently from what he later described as GroupM’s problematic trading practices.³

The defendants are WPP and its media investment arm, which handles ad buying for many of the world’s largest brands. WPP began rebranding GroupM as WPP Media in 2024 as part of a broader restructuring under CEO Mark Read.⁴ Brian Lesser joined as the division’s CEO in September 2024 and oversaw much of that transition.⁵

What Foster Alleges About Media Rebates

The heart of the complaint is Foster’s claim that GroupM ran what he calls a “hidden profit center” by keeping media rebates that belonged to advertiser clients. As described in the filings, GroupM pooled client ad budgets to hit volume thresholds with media vendors and platforms. When those thresholds triggered rebates in the form of free or discounted ad inventory, GroupM allegedly reclassified the inventory as “proprietary media” and resold it back to clients through opt-in agreements, booking the profit as “non-product related income.”⁶

Foster estimates that over five years GroupM generated between $3 billion and $4 billion in rebate-driven deals and improperly retained $1.5 billion to $2 billion.² Court filings put the annual figure at roughly $1 billion in non-product-related income from these arrangements.⁷

The complaint names names. Mark Patterson, global president of WPP Media, is identified as the “primary architect” of the rebate strategy; Patterson had publicly said in a 2016 Campaign Asia article that rebates were “not a dirty word.” Andrew Meaden, GroupM’s global chief investment officer, is accused of institutionalizing the practice. And WPP general counsel for media Nicola McCormick allegedly described the rebate situation privately as “existential” while declining to open a formal investigation.⁶

Project Claridges and the Firing

In late 2024, Lesser asked Foster to assess the division’s operations. Foster responded in December 2024 with a 35-page internal report he titled “Project Claridges,” proposing a new WPP Entertainment division and laying out concerns about the agency’s rebate and trading practices.⁸

The report contained internal data. Among GroupM’s top 30 U.S. billing clients, representing $13.5 billion in total spending, only 5% of eligible spend was routed through the proprietary inventory deals. Among the top 10 clients, accounting for $8.5 billion, nearly 92% of the proprietary inventory their budgets generated went unused. Google, GroupM’s single largest U.S. client at $2.3 billion in annual billings, used just 0.51% of the proprietary inventory its spending created.⁶

According to the complaint, Lesser shared an unedited copy of Project Claridges with Patterson, the executive Foster had identified as the architect of the rebate practices. Patterson allegedly told Foster he had “all he needed” and was then placed in charge of Foster’s division. Foster says he was excluded from meetings and stripped of decision-making authority in the months that followed.⁸ He was terminated on July 10, 2025.⁶

The Legal Claims and Damages Sought

Foster filed his complaint in the Supreme Court of New York, New York County, in November 2025, seeking not less than $100 million.¹ The suit asserts claims for wrongful termination, retaliation, and violations of whistleblower protection laws in both New York and California.⁹ He is seeking compensatory damages for emotional distress, reputational harm, and lost past and future earnings.

New York’s whistleblower statute, Labor Law § 740, protects employees who disclose activities they “reasonably believe” violate a law or regulation, or that pose a substantial danger to public health or safety. Amended in 2022, the law expanded coverage to former employees and independent contractors, extended the statute of limitations to two years, and granted plaintiffs a jury trial. Remedies include reinstatement, back pay, attorney’s fees, a civil penalty of up to $10,000, and punitive damages for willful or malicious violations.¹⁰ Employers can defend by showing the termination rested on grounds unrelated to the whistleblowing. Foster is represented by William A. Brewer III of Brewer, Attorneys & Counselors.¹¹

How WPP Is Defending the Case

WPP has pushed back hard. The company describes Foster as a “disgruntled former employee” who is “attempting to extract more severance through a complaint riddled with erroneous allegations.”¹²

The defense rests on three main arguments. First, WPP submitted a sworn statement from Brian Lesser asserting that on October 10, 2025, Foster’s attorneys threatened to go public with a draft complaint unless the company provided a large severance payment, a demand WPP says is “fundamentally incompatible with being a whistleblower.” Second, the company contends that Project Claridges was a business proposal designed to advance Foster’s own career rather than a protected whistleblower disclosure, arguing it contained no mention of illegal activity. Third, WPP argues Foster’s termination was part of a documented restructuring involving hundreds of U.S. employees and the elimination of his entire division, not retaliation.⁶ Brewer, Foster’s counsel, told The Sunday Times that WPP accused his client of extortion “without proper evidentiary support.”¹¹

The Client Data That Ended Up on the Public Record

WPP’s own filings triggered a secondary controversy. To support its motion to dismiss, WPP submitted exhibits that included the full Project Claridges report. The court filings exposed more than $9 billion in client ad spending data, along with platform-level breakdowns, revenue figures, and profit-and-loss details that agencies treat as strictly confidential.⁷

The disclosed data included global spending figures such as $9.4 billion with Google, $3.7 billion with Meta, and $1.1 billion each with TikTok, Amazon, and The Trade Desk.⁷ The filing also named specific 2023 client spending totals, including $299 million from Ford, $194 million from Unilever, and $101 million from Adidas, along with data covering JPMorgan, Shell, Cartier, and Coca-Cola.¹² The Times of London first reported the disclosure.¹³ Ivan Fernandes, a marketing consultant and former WPP employee, told the New York Post that the disclosed document contained “strategic and commercial intelligence that would normally remain internal.” Brewer said WPP “in its haste, exposed its own improper conduct and its clients’ proprietary information contained in Mr. Foster’s whistleblower report.”

Where the Case Stands

The case took a short detour through federal court. Foster filed originally in New York State Supreme Court (Case No. 659721/2025). WPP removed to the Southern District of New York on December 23, 2025, but Judge Gregory H. Woods quickly ordered the defendants to explain why the case should not be sent back for lack of subject matter jurisdiction. The defendants could not establish complete diversity, and on January 2, 2026, Judge Woods remanded to state court.¹⁴

As of mid-2026, the case sits in the discovery phase. Both sides have demanded a jury trial. Industry observers have speculated that the parties may settle before trial to avoid the exposure of additional confidential client data and internal communications.¹⁵

Why the Case Matters to Advertisers

The Foster suit landed during heightened scrutiny of principal-based media buying, where advertising agencies purchase ad inventory in bulk and resell it to clients at a markup, acting as vendors rather than as independent agents. A 2026 Association of National Advertisers study found that 58% of marketers had used principal media in the prior year, up from 47% in 2024, while the share of companies with governance guidelines for the practice fell from 62% to 57%.¹⁶ The same study found that 90% of respondents expressed uncertainty over whether the media their agencies recommended was truly in their best interest, up from 79% in 2024. The ANA noted that audit limitations in principal media arrangements make it difficult for advertisers to determine whether agencies are recommending inventory in the client’s interest or clearing excess stock.¹⁷ The Foster complaint sharpened those concerns by attaching concrete dollar figures to the gap between what an agency earns through principal trading and what clients see.

1
MediaPost. WPP Slapped With $100M Retaliation Lawsuit
2
Los Angeles Times. Former CEO of Co-Producer Behind Love Island Sues for $100 Million Claiming Financial Misconduct
3
MMM Online. Former CEO Within WPP Media Sues WPP for Alleged Retaliation Violating Whistleblower Protection Laws
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Campaign. Mark Read Calls WPP Media Restructure Disruptive but Necessary
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Adweek. WPP Kill Off GroupM Rebranding WPP Media
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Digiday. In Fighting a Whistleblower Suit WPP Put Its Own Account of Media Agency Trading on the Public Record
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eMarketer. WPP Court Filing Exposes $9 Billion Client Spending Data Raising New Questions About Agency Trading Practices
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Storyboard18. Ex-GroupM Chief Sues WPP Alleges GroupM Turned Client Rebates Into Secret Profit Centre
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Campaign. Former CEO Within WPP Media Sues WPP for Alleged Retaliation Violating Whistleblower Protection Laws
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New York State Senate. New York Labor Law Section 740
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Brewer Attorneys. The Sunday Times Reports on WPPs Release of Client Data in Dispute With Brewer Client Richard Foster
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New York Post. Top Advertising Agency WPP Releases Trove of Confidential Client Data While Fighting Suit From Ex-Employee
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The Times. WPP Client Data Disclosed in US Legal Clash With Ex-Employee
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PACER Monitor. Foster v WPP PLC et al
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MediaPost. Navigating the Fallout of the WPP Whistleblower Suit
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MediaPost. ANA Finds Principal Buying Continues to Grow
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Ad Age. ANA 2026 Principal Media Study