Walmart Connect today announced that its first-party shopper audiences are now available for activation inside Yahoo DSP, marking the first time the retail media network's data has been accessible through the platform. The move, announced May 28, 2026, is routed through Magnite's supply-side technology and covers VIZIO connected television inventory specifically. It represents a structural departure from the walled-garden approach Walmart Connect has historically maintained around its proprietary demand-side platform.

The announcement was described in a blog post authored by Ryan Mayward, general manager and senior vice president at Walmart Connect, published Thursday. According to Mayward, "Through Walmart DSP and our existing offsite capabilities, advertisers can reach these high-intent audiences beyond Walmart-owned properties across CTV and other channels."

What the integration actually does

The technical architecture behind the announcement involves three companies working in sequence. Walmart Connect supplies the first-party data - purchase-based audience segments derived from the retailer's shopper transaction history. Magnite, acting as the supply-side platform, provides the infrastructure that allows that data to move across multiple DSPs while maintaining Walmart's control over how it is applied. Yahoo DSP sits at the buy side, giving its advertiser base the ability to plan, activate, and measure campaigns using Walmart's audiences without switching platforms.

Magnite's role is more than a simple pipe. According to Walmart Connect, the SSP's technology supports the ability to automate processes that analyze data by determining who views a page or screen at any given millisecond. In practice, that means Walmart-controlled data crosses multiple DSPs through Magnite to create what the company describes as a closed-loop measurement approach - a system that connects the moment an ad is served to subsequent purchase activity recorded at Walmart. The loop closes on Walmart's actual sales data, not a modeled proxy.

This is a meaningful distinction in the retail media measurement debate. Many offsite campaigns rely on correlational models to infer whether an ad influenced a purchase. Here, the measurement connects ad exposure directly to confirmed Walmart transactions, which provides a harder accountability standard for upper-funnel brand investments.

The 150 million shopper figure

Yahoo DSP's own announcement, published on LinkedIn today, states that 150 million shoppers are now reachable through its platform as a result of the integration. That figure reflects the scale of Walmart's shopper base and the breadth of its transaction data. Walmart serves approximately 280 million customers weekly across its physical and digital properties, and the 150 million figure likely represents the addressable audience segment built from that base that can be matched and activated programmatically.

For context, this is the first time Walmart Connect's audiences have been available in Yahoo DSP. The scope is currently limited to VIZIO CTV inventory, which places the initial activation squarely in the connected television channel.

Why VIZIO, and why now

Walmart completed its acquisition of VIZIO earlier in fiscal 2026. The purchase gave Walmart access to SmartCast, VIZIO's operating system, and with it the automatic content recognition data that the platform collects from millions of connected television households. ACR data identifies what a household watches - across streaming, linear, and broadcast - and that signal can be layered onto Walmart's purchase data to build audience segments that combine viewing behavior with verified buying intent.

VIZIO's appearance in Walmart Connect Ad Center's Publishers and Social beta tab was noted as early as April 2026, when a screenshot surfaced showing VIZIO as a selectable media type alongside TikTok, Meta, and Disney in a beta interface. That interface signaled that Walmart was working toward a unified CTV and retail media buying surface. Today's announcement with Yahoo DSP takes that integration one step further by making the VIZIO supply available outside Walmart's own DSP.

The strategic logic of using CTV as the lead format for this data expansion is clear. Retail media and CTV have been converging as major networks build curated deal layers that apply first-party data before the auction and connect ad exposure back to confirmed purchase outcomes. Walmart Connect's move follows a pattern that has been developing across the sector - Best Buy selected Magnite as its exclusive SSP and curation partner in September 2025 using a structurally similar approach, applying retail first-party data to programmatic CTV buys through an independent SSP.

Decoupling data from the proprietary DSP

One of the more architecturally significant aspects of the announcement is what it signals about Walmart Connect's platform strategy. The previous model kept Walmart's first-party data tightly integrated with the Walmart DSP, which meant advertisers who wanted to use that data had to buy through Walmart's own technology. That walled-garden approach has clear commercial logic - it drives adoption of a proprietary platform - but it also limits scale and creates friction for agencies and brands that already operate within their preferred DSP environments.

According to Walmart Connect, the expansion plan is designed to build a more open, flexible model for offsite retail media - one that supports advertisers wherever they connect with customers. The key phrase is that it decouples Walmart Connect's first-party data from its proprietary DSP. Advertisers will be able to access Walmart's audiences and measurement tools within their preferred programmatic buying platforms without adding new platforms, integrations, or operational complexities.

That is a significant concession to the realities of how large advertisers actually operate. Agencies running media across multiple clients typically centralize buying within one or two DSPs, and requiring them to log into a separate environment to activate Walmart data adds cost and workflow complexity that reduces adoption. By routing the data through Magnite and making it available in Yahoo DSP - and, according to the announcement, additional platforms to be named later - Walmart Connect widens the pool of advertisers who can activate its data at scale.

Walmart Connect has been building this openness incrementally. In late April 2026, the company launched Connect Select, a curated CTV marketplace within the Walmart DSP that named Magnite, PubMatic, FreeWheel, and Index Exchange as SSP partners. That move brought VIZIO, Paramount, and Warner Bros. Discovery inventory into a structured deal layer accessible to all advertisers on the Walmart DSP. The Yahoo DSP announcement extends the architecture one step further, carrying Walmart's data into an external buying platform rather than only opening new supply within Walmart's own interface.

The new-to-brand metric

Walmart Connect's internal data from 2025 adds a specific commercial argument to the offsite expansion. According to Walmart Connect, advertiser offsite display campaigns run through Walmart Connect delivered a median of 52% new-to-brand customers during 2025. That figure is positioned as evidence that offsite inventory - reaching audiences on channels outside Walmart-owned properties - drives customer acquisition rather than simply retargeting existing buyers.

For brand advertisers, particularly those in consumer packaged goods, the new-to-brand metric carries weight. Shelf-oriented advertising at the point of sale tends to capture existing category buyers. Reaching prospective customers earlier in the purchase journey, through upper-funnel channels like CTV, addresses a different and arguably more valuable problem: expanding the buyer base. A 52% new-to-brand rate from offsite display campaigns, tied to actual Walmart transaction data, provides a measurable foundation for that argument.

How Yahoo DSP fits the picture

Yahoo DSP has been expanding its content and data partnerships steadily. Netflix added Yahoo DSP as its fourth global programmatic advertising partner in June 2025, joining The Trade Desk, Google DV360, and Microsoft. In January 2026, Yahoo DSP embedded AI agents capable of autonomous campaign operations, including a campaign activation agent built on Model Context Protocol that can execute programmatic guaranteed buys. The platform sits alongside The Trade Desk and DV360 as one of a small number of scaled independent DSPs with broad supply access and a mature advertiser client base.

According to Adam Roodman, general manager of Yahoo DSP, "Advertisers are looking for simpler ways to activate high-quality data across their programmatic investments. By making Walmart Connect's audiences and measurement available for activation to buyers in the Yahoo DSP, we're reducing friction in the buying process and making it easier to plan, activate, and measure campaigns."

The phrasing - reducing friction, simpler activation - reflects a commercial reality that has constrained retail media's offsite growth. Retail data has historically been high-quality but low-accessibility. Getting it to flow through the platforms where media decisions are actually made, without additional integrations or operational overhead, has been a persistent gap.

Magnite's commerce media position

Magnite's role in this announcement fits a pattern the SSP has been building for some time. Magnite posted its first quarterly profit as CTV crossed 50% of revenue in the most recent earnings period, and the company had 21 commerce media partners as of that report, with 13 deployed and actively ramping. Walmart Connect's Connect Select program was among those listed. The Yahoo DSP announcement represents the next operational layer of that relationship - Magnite is now the conduit through which Walmart's data flows not just within Walmart's own DSP but into external buying platforms.

Magnite's SpringServe platform provides the technical underpinning for the VIZIO integration specifically. Magnite's CTV supply coverage has been benchmarked at 99% of US streaming supply by Jounce Media, which gives the SSP the reach necessary to make VIZIO inventory accessible at scale through multiple buy-side platforms. The infrastructure, then, is not experimental - it is the same stack that already underpins a significant share of US streaming ad transactions.

What comes next

Walmart Connect stated today that additional platform and media partners are planned beyond Yahoo DSP. The current announcement focuses specifically on Magnite's supply-side technology and VIZIO inventory via Yahoo DSP. The framing - that this is a first step in a broader expansion of offsite data access across the programmatic ecosystem - suggests further DSP partnerships are on the horizon, though no names or timelines were provided.

Walmart's Scintilla API, launched April 28, 2026, opened retail data to media partners through an API-based product that allows advertisers to share Walmart's first-party operational and retail data with agency and technology partners. That launch addressed a different structural gap - connecting retail performance data to media planning workflows - but it sits within the same broader direction: making Walmart's first-party data infrastructure more accessible to the agencies and platforms that manage large advertising budgets.

Taken together, the Scintilla API, Connect Select, and the Yahoo DSP integration form a coherent architecture. Walmart is not simply opening a single door. It is building a data distribution layer that allows its shopper intelligence to flow across the programmatic ecosystem - at the supply side through Magnite, at the buy side through Yahoo DSP and others to follow, and at the data layer through Scintilla. The question for the market is whether that architecture can match the scale and adoption of what The Trade Desk, and before it, Amazon DSP, have built as destinations for retail media data.

Walmart Connect's advertising business reached $6.4 billion in fiscal year 2026, growing 46%, with Walmart Connect growing 41% in the fourth quarter. The offsite expansion announced today is the next phase of that growth story.

Timeline

Summary

Who: Walmart Connect, the retail media division of Walmart, in partnership with Yahoo DSP and Magnite.

What: Walmart Connect's first-party shopper audiences are now available for programmatic activation inside Yahoo DSP, routed through Magnite's supply-side platform and covering VIZIO connected television inventory. The integration brings closed-loop measurement tied to actual Walmart sales. According to Walmart Connect, offsite display campaigns via its platform delivered a median of 52% new-to-brand customers in 2025. Yahoo DSP states that 150 million Walmart shoppers are now reachable through the platform.

When: The announcement was published May 28, 2026, in a blog post authored by Ryan Mayward, general manager and senior vice president at Walmart Connect.

Where: The integration operates across VIZIO CTV inventory accessible through Yahoo DSP, extending Walmart Connect's first-party data beyond Walmart-owned properties into the open programmatic ecosystem.

Why: Walmart Connect is decoupling its first-party data from its proprietary DSP to reduce friction for advertisers who prefer to activate within their existing programmatic buying environments. The move responds to structural pressure from agencies consolidating media operations within a small number of DSPs, while also positioning Walmart Connect's shopper data as a broadly accessible input for CTV campaigns measured against actual retail sales outcomes.

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