WPP Turns Trust Principles Into Contract Terms for AI

WPP chief executive Cindy Rose published five trust principles on June 22, 2026, turning data control, platform design and fees into public commitments. She posted them on the opening day of Cannes Lions, with WPP still selling itself as a trusted growth partner under Elevate28.

The useful lines are the ones a procurement team can paste. Clients own their data. WPP Open will not trap them in a closed stack. Fees can follow business results when a client wants that.

Five Clauses Built for the Next Pitch

Rose wrote that clients now ask marketing partners to drive enterprise growth, not only to ship campaigns, and that they want a straight answer on data, brands and customer relationships. AI, she said, has made trust scarce. The five WPP trust principles are the public reply. She said many of them already described how the firm worked, and that the new step was to put them in writing.

The first clause is the hardest commercial one. Clients own and control their data. WPP says it will not own it, control it, use it for its own benefit or let it benefit third parties, including for training third-party AI models. Rose tied that rule to Open Intelligence, the layer under WPP Open, which she said uses patented data bunkers to connect client data to live signals from over 350 partners and from WPP, inside the client’s environment.

The second clause is a product claim. WPP Open is “open by design,” built to interoperate with client and partner tools rather than lock anyone into a single closed system. Rose went further than a slogan. If WPP has to keep clients through contractual friction, data dependency or platform lock-in, she wrote, it has failed.

THE QUESTIONS ROSE SAID CLIENTS ASK

• On data: Whether it is safe, and whether it is being used to train third-party AI models or platforms.
• On the stack: Whether the client is being locked into a closed ecosystem.
• On AI use: Whether the work has governance and a human who is accountable.
• On the brand: Whether the brand itself will be protected as machines generate more of the output.
• On money: Whether the media budget is being optimised for the client’s growth, and whether the partner will help the company grow.

Those questions are the brief. The table below is the offer WPP put against them.

WHAT EACH PRINCIPLE CHANGES IN A PITCH

Principles 3 and 4 are softer. They describe a view of consumers and a view of labour. They do not, on their own, change an audit clause. Principles 1, 2 and 5 do.

2025 Left WPP Selling Trust as a Product

The timing was not a festival flourish. Rose took over in September 2025. On February 26, 2026 she put the Elevate28 plan published in February next to a rough year. WPP said recent underperformance came from organisational complexity, a missing integrated operating model and uneven execution.

The holding-company map is being folded into one company with four units, WPP Media, WPP Creative, WPP Production and WPP Enterprise Solutions, across North America, Latin America, EMEA and APAC. All four sit on WPP Open. The financial target is £500 million of gross annualised cost savings by 2028, with about £400 million of cash costs over two years. 2026 is the Stabilise year. 2027 is Build, with a return to organic growth during that year. 2028 is Accelerate.

THE 2025 FIGURES BEHIND THE PLEDGE

• Revenue: £13,550 million, down 8.1% reported and 3.6% like-for-like against £14,741 million in 2024.
• Net sales: Revenue less pass-through costs of £10,176 million, down 5.4% like-for-like.
• Margin: Headline operating margin 13.0%, down from 15.0% (1.8 points like-for-like); reported operating profit £382 million, down 71.2%, after a £641 million goodwill impairment.
• Clients: The top 25 clients were down 4.1% like-for-like; WPP Media was down 5.9%, and 10.8% in the fourth quarter; China was down 14.3%.

That is the market in which “trusted growth partner” has to do work. A firm that has just lost assignments cannot treat data handling as an unwritten habit. It has to say, in a document a CMO can forward, that client data will not become someone else’s training set.

By August 6, 2026, WPP’s interim results showed the decline slowing rather than reversing. Revenue less pass-through costs was £4,745 million in the first half, down 4.7% like-for-like against £5,026 million a year earlier. The second quarter was down 2.8% like-for-like. The Stabilise year was still a down year. The principles stayed in the pitch.

WPP Open Is the Stack These Rules Describe

WPP Open is the object the second principle is defending. The company calls it an agentic marketing platform that ties strategy, creative, media and production to shared intelligence. Client teams can use it, WPP teams can use it, or both can sit in it together. A self-serve edition, WPP Open Pro, already lets some brands plan, make and publish work without a full managed team.

The intelligence layer is the data argument in software form. On April 3, 2025, while Mark Read was still chief executive, WPP bought InfoSum, a data-collaboration firm, and put it inside GroupM, then the media group. InfoSum’s pitch was that datasets can be matched without being moved or exposed. Brian Lesser, then GroupM chief executive, said the point was to train client models against more data, from more places, without handing over the raw files. Rose’s June text says that same machinery now lives in the client’s environment.

Open Intelligence Keeps Data in Place

WPP’s Open site describes signal-led marketing: behaviour and context, not a file of personal identifiers. It also publishes performance claims of 12% more new customers acquired, 28% higher revenue and 60% lower cost per acquisition. Those are WPP’s figures, not an outside audit, and they sit beside the legal promise in principle 1. The architecture is the proof Rose is offering that “clients own their data” is more than a sentence in a PDF.

InfoSum’s network, as WPP listed it at the deal, ran through publishers and platforms such as Channel 4, DIRECTV, ITV, Netflix, News Corp and Samsung Ads, and through data firms including Experian, TransUnion, Circana, Dynata and NCSolutions. Buying the former neutral clean room solved a product problem. It also created the question principle 1 is meant to close: once the clean room belongs to the holding company, who benefits when signals compound?

Interoperability Is the Sales Argument

On the first-half 2026 call, Rose said WPP had deepened technology partnerships with Google, Adobe, Meta, AWS and Microsoft so clients would not have to juggle point tools. That is the “open by design” line in operating form. It is also how a holding company that is collapsing four units onto one platform answers the lock-in charge before a consultant writes it into an RFP.

We’ve made this design choice because we believe that if we’re relying on contractual friction, data dependency or platform lock-in to retain clients, we’ve failed. We want our clients to stay with us because of the superior growth we deliver for them.

Cindy Rose, CEO, WPP trust principles, June 22, 2026

The sentence is a retention strategy. Once rival shops can rent the same models, feature advantages in AI tools got cheap, and the remaining fight is over data rights, switching costs and who takes the bonus when sales move.

Holding Companies Reached for Principles After 2016

Ad groups have published trust language before, under different pressure. On June 7, 2016, the Association of National Advertisers released a 2016 study of U.S. media buying by K2 Intelligence. The study found cash rebates, undisclosed principal trades and other non-transparent practices across a sample of the market. Markups on media sold through principal transactions ran from 30% to 90% in the evidence K2 reviewed. WPP, through GroupM, said at the time that it did not seek or accept rebates or hidden revenues from media partners in the United States.

Marketers answered with contract templates, audit rights and codes of conduct. Holding companies answered with public pledges. A decade later the fight has moved from rebates on spots to training rights on models, but the form is familiar: a scare, then a one-pager a client can attach to a scope of work.

FROM REBATES TO AI RULES

1. June 7, 2016: The ANA publishes the K2 study on rebates and principal trades in U.S. media buying.
2. April 3, 2025: WPP buys InfoSum and folds clean-room tech into its media group and into WPP Open.
3. September 2025: Cindy Rose becomes chief executive.
4. February 26, 2026: Elevate28 launches beside 2025 results that show a 5.4% like-for-like drop in revenue less pass-through costs.
5. April 15, 2026: The FTC and eight states file a complaint and a stipulated injunction against GroupM Worldwide, trading as WPP Media, plus Publicis and Dentsu.
6. June 22, 2026: Rose publishes the five principles on Cannes opening day.

The 2016 episode was about whether agencies made money the client never saw. The 2026 document is about whether the client’s data, and the insights pulled from it, remain the client’s when the work is done by agents on a shared platform.

Jaguar Land Rover Remains the Only Outcome Client

Principle 5 is the fee rewrite. Rose wrote that media budgets belong to clients, that WPP should maximise return on them, that plans should be open to scrutiny, and that the firm is “increasingly tying our remuneration to client business outcomes when they wish to do so.”

Jaguar Land Rover is the named case. In May 2026 the carmaker confirmed WPP as its global partner for creative, media, production, customer experience and marketing strategy, with pay tied to a set of business and brand metrics. The team sits with JLR marketers at WPP’s Sea Containers campus in London and covers Range Rover, Defender, Discovery and Jaguar. Lennard Hoornik, JLR’s chief growth officer, said the setup was meant to resolve the old split between scale and intimacy. Rose called the two sides kindred spirits. WPP Open is in the deal.

In August 2026, Rose said Jaguar was still unique in taking that offer, and that the shift would take a few years. Time-and-materials, she said, is hard to keep when AI lets the same work run faster with fewer people. Joanne Wilson, WPP’s chief financial officer, has described the next commercial mix as people costs plus tech costs, not people alone. Principle 5 puts that mix in client-facing language before most clients have signed it.

If outcome pay stays a special for one automotive group, the fifth principle is a brochure line. If it spreads, WPP is changing what it sells: not hours, and not even a platform seat, but a share of the growth the platform is supposed to find.

Why the April Order Sits Beside the Pledge

Two months before Cannes, WPP Media was in federal court in Fort Worth. On April 15, 2026, the Federal Trade Commission, with Florida, Indiana, Iowa, Montana, Nebraska, Texas, Utah and West Virginia, filed a complaint alleging that WPP, Publicis and Dentsu had engaged in unlawful collusion on brand safety standards from 2018, through a common “Brand Safety Floor” aimed at “misinformation.” The agency said that floor, used with firms such as NewsGuard and the Global Disinformation Index, steered money away from disfavored political viewpoints. The court entered a stipulated permanent injunction the same day. The case is about where ads may run, not about training data.

Rose’s fifth principle says media plans should serve the client’s growth and that WPP welcomes scrutiny. The April order is a separate, narrower rule about coordinated exclusion lists. Putting them in the same year is not a claim that one caused the other. It is the climate in which a holding company found it cheaper to write its media and data habits down.

On June 24, 2026, WPP’s own account summed up a Cannes rooftop session in one line: AI can start the journey, but human trust is the final destination. That is festival copy. The April filing is the reminder that trust, in this trade, is also a regulatory file.

Human Taste Gets a Promise Without a Number

Principle 4 is the labour clause. Rose wrote that imagination, judgment, taste, empathy, humour and even imperfection are what still differentiate brands, and that AI should automate the ordinary so people can raise the rest. Over two and a half years, she said, WPP ran approximately 300 AI vendor assessments. Tools on WPP Open go through legal, privacy, security and enterprise-technology review, then land in approved, conditional or off-limits buckets. Agents are supposed to sit inside narrow guardrails, with simulation tests for accuracy, compliance and consistency, and with a named human still on the hook.

The same section covers intellectual property. WPP says it works with rights-cleared content on the platform and runs due diligence on every integrated model. That is useful to a brand lawyer. It is not a headcount guarantee. “Augment, not replace” does not say how many people stay on an account when Open Pro can publish a campaign from a browser.

Principle 3, people not IDs, is the other soft plank. Rose argued that identifier targeting has flattened brands, and that Open Intelligence should find growth audiences from motivations, values, interests, beliefs and cultural context. In an “agentic” market, she wrote, a brand has to influence both the shopper and the algorithm that now sits between them. The Data Code of Conduct she cited has, she said, been in force for over a decade, with protection agreements and independent audits. What is new is the bunker hardware and the public wording.

Cannes still did what Cannes does. WPP agencies picked up Day One golds, including Art’s Missing Period for Kotex from DAVID London and Ogilvy Singapore, and other work from Ogilvy Shanghai, VML Thailand, VML on health, and WPP Open X on Coca-Cola in Mexico. The awards were the backdrop. The document was the business.

The five clauses now sit in the same folder as Elevate28, the InfoSum stack and the JLR fee experiment. Clients can ask for them by name. Whether anyone else signs the fifth one, and whether Open stays easy to leave, will show up in contracts, not in another rooftop line.