For Walmart Suppliers, The Yahoo DSP Move Is a Planning Problem, Not a Buying One

On May 28, Walmart Connect said it would begin making its first-party shopper audiences and closed-loop measurement available inside third-party demand-side platforms, starting with Yahoo DSP and a single supply source: VIZIO connected-TV inventory routed through Magnite’s supply-side technology. In the same announcement, Ryan Mayward, general manager and senior vice president of Walmart Connect, noted that more platform partnerships are planned, including additional Yahoo DSP capabilities. The program is not generally available. Walmart describes it as a closed proof of concept that will widen at a later date.

The mechanism is worth slowing down on. Until now, the route to Walmart’s shopper data for offsite media ran through Walmart DSP, the platform Walmart built with The Trade Desk and launched in 2021. This step detaches the data from that proprietary platform, but it does not hand it over. Access runs through what Walmart calls a Walmart-controlled data enablement layer, with Magnite’s technology matching those audiences to inventory inside the third-party DSP. The launch supply makes the point sharper still. VIZIO is not a third party. Walmart completed its $2.3 billion acquisition of VIZIO in December 2024, and the smart-TV maker now operates as a wholly owned subsidiary. So the first time Walmart’s data leaves its own DSP, it is pointed at inventory Walmart owns and activated inside a third-party platform, still routed through an enablement layer Walmart controls.

This did not come from nowhere. A month earlier, on April 27, Walmart Connect launched Connect Select, a curated marketplace sitting inside Walmart DSP that opened VIZIO, Paramount, and Warner Bros. Discovery inventory to advertisers alongside SSP partners including FreeWheel, Index Exchange, Magnite, and PubMatic. The contrast between the two moves is the tell. Connect Select widened what advertisers could buy inside Walmart’s own interface. The Yahoo step carries Walmart’s data outside that interface for the first time. Two moves in roughly a month read as a direction, not a one-off experiment.

For brands that advertise through Walmart Connect, the significance is not the Yahoo pipe or the VIZIO supply. It is the precedent. Walmart is signaling that the price of using its shopper data offsite will no longer be adopting its own DSP, and that is a real change in the calculus for advertisers who have weighed whether to commit a team and a budget to a retailer-specific buying platform. The caveat is that this is a signal, not a switch. With one external DSP, one owned supply source, and access still gated, no supplier should rebuild a media plan around it this quarter.

The planning question lands hardest on large first-party suppliers. Many of them run national or brand media through their own demand-side platforms while treating Walmart Connect as a separate shopper-marketing line, with its own team, its own budget, and its own reporting. Mayward framed the expansion as one that brings “national media and shopper marketing closer together,” and for a 1P supplier that is the line to take seriously. If Walmart’s audiences and sales-based measurement can travel into the DSP a brand’s national team already operates, the argument for running those two efforts as one strategy, rather than two budgets defending separate turf, gets stronger. Suppliers in that position should start mapping what a converged plan would look like before the capability is general, so they are ready to move when it is.

For third-party Marketplace sellers, the read splits. Sellers running upper-funnel brand campaigns, the larger and better-resourced ones, get a smaller version of the same opportunity, and the same advice to plan rather than buy applies. For the much larger group of 3P sellers whose Connect spend sits in onsite Sponsored Search, this changes nothing they do day to day, and it will not while access stays gated. The useful posture for that group is awareness, not action: know that Walmart’s offsite model is opening, and revisit it when it reaches general availability rather than reorganizing around a test.

The measurement may matter more than the audiences, and it is the part most likely to survive contact with general availability. Walmart’s pitch is that closed-loop measurement tied to actual sales across its site, app, and stores travels with the data into the third-party DSP, which is what would let a brand judge an offsite CTV impression against Walmart purchases rather than against a proxy. Walmart has reason to lead with offsite performance. By its own first-party measure, advertiser offsite display campaigns delivered a median of 52% new-to-brand customers over the year ending January 2026, and offsite CTV campaigns delivered a median of 44% new-to-brand buyers over the same period. Those are Walmart’s own figures, not independently audited, and they describe different channels, so they are best read as the case Walmart is making rather than a settled result. They also explain why Walmart is willing to let the data travel at all: an offsite engine that brings in new buyers is one worth extending well beyond Walmart’s own platform.

What to watch from here is less the headline and more the terms. Walmart has said more DSP and platform partnerships are coming, so the questions that decide how much this matters are which buying platforms come next, how much supply beyond Walmart-owned VIZIO enters the model, and whether general availability keeps the data running through Walmart’s own enablement layer or loosens that control. The answer to that last question is the one suppliers should track, because it separates a genuinely open offsite model from a wider version of the same closed loop Walmart has always run.

Winning With Walmart

Winning With Walmart is an independent platform for suppliers, sellers, solution providers, and industry experts.

Articles are developed by staff editors, contributing experts, and trusted partners.

Some are researched and drafted with the assistance of AI tools and are reviewed, fact-checked, and edited by Winning With Walmart editors before publication.

Editorial judgment, sourcing decisions, and final approval rest with the publication's human editors in every case.

We are committed to accuracy and fairness. If you believe this article contains an error, we welcome your feedback.