Unlimitail will take over the digital retail media of French grocery cooperative Coopérative U in January 2027, making official a tie-up the market had been expecting. The Carrefour and Publicis joint venture will sell and run U's web and app inventory: sponsored products, banners, video and site takeovers. That inventory will sit with Carrefour's under a single sales team.
With both retailers, Unlimitail claims more than 35% of the French grocery market. Rival alliance Valiuz puts its member retailers at 27%. ConsoRégie relies on French retailer E.Leclerc, whose share is around 24.5%.
Those are the retailers' market shares, not their ad sales arms'. Still, they show how much leverage each of the three will have with consumer packaged goods brands.
Unlimitail plans to bring Carrefour's existing formats to U. "Buyers will find sponsored products, of course, but also the Spotlight format at the top of the page and Shopping further down," Thibault Hennion, COO of the 40-retailer alliance, told Open Garden. "Video will be phased in gradually."
U will move off Criteo, which has run its retail media since 2025, in a single switchover early next year. U will test the tools beforehand, including on non-monetized pages.
Self-service is on the roadmap too. It is set to open about two months after Unlimitail takes over the inventory. "The teams need time to assess delivery capacity, how much budget the inventory can absorb, capping and performance," Hennion said. "Then agencies can run campaigns on their own, and we can answer their questions."
Buyers remember Valiuz
Buyers will watch this new round of consolidation closely. When Valiuz teamed up with Infinity Advertising, the ad sales arm of Intermarché owner Les Mousquetaires, its new commercial terms drew sharp criticism. In the bundled offer, the seller decided how budgets were split across French grocers Intermarché, Auchan and Chronodrive, based on available inventory. Brands that wanted to buy a single retailer paid a 20% CPM surcharge.
Unlimitail won't go that route, Hennion said. "Buyers will be completely free to invest in U and not Carrefour, or the other way around," he added. Advertisers will control the split, with separate budgets and daily caps for each retailer and separate performance reporting. A brand that needs to lift sales at U won't have to bring Carrefour into its plan.
Price is the other issue. At Valiuz, buyers interviewed by Open Garden reported 22% increases on some flagship formats, before the surcharge for buying separately. They saw the consolidation as a price hike as much as a simplification.
Hennion is trying to reassure buyers here too. "Carrefour hasn't raised floor prices in at least a year and a half," he said. Some inflation is likely, but it will be modest. Unlimitail knows that could cause friction. It ran its new pricing past a few key buyers, according to Open Garden's reporting.
Same rules for measuring results
The deal should also make results easier to compare. "Both retailers will use the same attribution window and the same product inclusion rule," Hennion said. Brands will still make their own trade-offs. But their reports will follow the same conventions.
In-store sales attribution, which Carrefour has offered since the start of the year, will come to U in the weeks after the partnership officially launches. So will access to the new inventory through retail media buying platforms such as Skai and Pacvue.
Not everything will be ready in January. An audience extension offer depends on U overhauling how it collects the consent it needs. The hope is to launch later in 2027. That would also let U join Unlimitail's "Social retail" offer.
Advertising in AI assistants is still exploratory. U is expected to launch its AI assistant with shoppable recipe startup Mealz. Carrefour, meanwhile, is weighing ads in its in-house assistant, Hopla, using banners or sponsored products served through Citrus, the in-house ad tech. "Volumes are still low," Hennion said. "It's more an innovation topic than a lever that will carry weight in media plans in the short term."
U is also part of the in-store tender
The partnership extends into stores as well. Coopérative U is part of the tender Unlimitail launched this summer for hypermarkets and supermarkets, alongside Carrefour. Run with U's teams, the tender drew bids from in-store media firms Mediaperf and in-Store Media and from outdoor ad company JCDecaux, according to Open Garden's reporting.
JCDecaux had listed Unlimitail's in-store retail media network among its tender opportunities when it presented its first-half 2026 results. That project is separate from the alliance JCDecaux already formed with Carrefour, shopping center owner Carmila and Unlimitail, which covers malls and their entrances.
For Unlimitail, the goal is to bring out-of-home players and methods into stores. For JCDecaux, it would mean moving from the outside of retail sites into the aisles, where it would compete with legacy in-store media specialists.
The footprint has one limit: store buy-in. "With franchisees and independents, the final decision belongs to the store operator," Hennion noted. A joint tender can structure an offer and recommend partners. It can't guarantee every store will follow.
