• by Maarten Albarda , Featured Contributor, Yesterday

It’s been quiet in the Richard Foster vs. WPP case, and with the 2026 Association of National Advertisers’ Advertising Financial Management Conference scheduled for May 3–6, it’s time to take stock of where we are. The case has evolved into a bit of a masterclass on unintended consequences.

A quick recap: The lawsuit, filed in the New York State Supreme Court, centers on Richard Foster, a 17-year GroupM veteran and former CEO of Motion Content Group, which is owned by WPP. Foster alleges he was terminated in retaliation for whistleblowing on media deals that allegedly benefited WPP, but not its clients. His internal report, "Project Claridges," detailed a business model that reportedly generated $1 billion annually in "non-product" revenue -- essentially rebates and discounts earned on client spending that WPP allegedly pocketed rather than returned.

WPP claims Foster was let go during a legitimate restructuring and that his lawsuit is merely an attempt by a "disgruntled employee" to extort a larger severance. But in their haste to discredit Foster, WPP and its lawyers made a potentially terrible mistake. While filing its motion to dismiss, WPP submitted a 35-page internal document to the public court record.

The document reportedly contained strategic intelligence on more than $9 billion in advertising payments, detailing the spending habits of major clients like Google, Coca-Cola, Unilever, and Ford. For an agency group that sells trust, airing its clients’ most sensitive financial laundry in a public forum was a major and probably very costly mistake.

The case took a brief detour to federal court ,when WPP attempted a removal of the document from the public court record. But in January 2026, the U.S. District Court remanded the case back to the New York State Supreme Court. The court essentially told the parties that it lacked subject matter jurisdiction for a federal case, placing the matter squarely back in the hands of state judges.

Both parties have demanded a jury trial. For WPP, a jury trial is a high-risk gamble. Juries in New York are not known for their sympathy toward multibillion-dollar holding companies, especially when the case involves allegations of "secret" profit centers.

We are now entering the discovery phase, which is a potentially dangerous period for WPP, as with any company. Foster’s legal team now has the power to subpoena internal emails and contract details.

Amid all the legal wrangling, the industry has already learned a few things that no legal outcome can erase.

First, the biggest, most sophisticated spenders aren't buying into principal media. In the U.S., reportedly only 3% of GroupM’s top 10 clients’ spend went through these proprietary media offerings. That should give other advertisers pause.

Second, marketers now know that principal media is often a high-margin extraction tool where their own spend creates the agency’s profit. And finally, your agency can’t claim to be a "trusted growth partner” -- the new WPP mission at the core of its proposition (with media and AI integrated into the WPP Open platform) -- while chasing opaque hidden income.

My money is on the parties reaching a settlement before this case hits a jury. WPP cannot risk more confidential client data or internal "Project Claridges" communications being exposed during discovery. Meanwhile, the "extortion" allegations against Foster give WPP some leverage to negotiate.

Luckily, the lessons for all of us are already learned.