Retail Media Networks Are Buying Their Way Into CTV — And Rewriting Video Measurement in the Process

In the span of five weeks, the three largest U.S. grocery retailers each made moves that would have been unthinkable two years ago. Walmart agreed to acquire self-serve CTV platform Vibe.co for $1.4 billion. Walmart Connect piped its first-party shopper audiences into Google's Display & Video 360 for YouTube campaigns with closed-loop sales measurement. Target's Roundel became the first retail media network on DirecTV, linking video ad exposure across live TV, streaming, and even hotel room screens to in-store purchase data. And Kroger Precision Marketing expanded its YouTube advertising integration via DV360, letting advertisers target precise shopper audiences and measure the sales impact of video campaigns.

These are not isolated product announcements. They are the opening moves of a structural shift: retail media networks are evolving from search-and-display ad sellers into full-stack video advertising platforms — and the measurement implications are enormous.

The Walmart Stack: Hardware, Software, Data

Walmart's strategy is the most aggressive and the most vertically integrated. The company acquired VIZIO in 2024 for $2.3 billion, gaining both a hardware install base of smart TVs and the automatic content recognition (ACR) data those TVs generate. The Vibe.co acquisition, announced on June 23, adds a self-serve CTV buying platform designed specifically for small and mid-sized businesses — the advertisers who historically could not access connected TV because the minimum spend was too high and the buying process too complex.

Combined with the Yahoo DSP integration announced on May 28 — which routes Walmart's first-party shopper audiences through Magnite's supply-side technology to reach VIZIO CTV inventory — Walmart now controls the full stack: the glass (VIZIO hardware), the data (150 million weekly U.S. shoppers), the supply path (Magnite), and the buying interface (Vibe.co for self-serve, Yahoo DSP and Google DV360 for managed).

The Google DV360 integration, currently in a closed proof of concept, enables advertisers to activate Walmart Connect audience segments on YouTube and measure how video impressions influenced omnichannel sales at Walmart. This is the integration that matters most for measurement teams: it connects YouTube's massive reach to Walmart's transaction data, creating a closed loop from ad exposure to purchase that YouTube has never had from a retailer at this scale.

Target Takes a Different Path

Where Walmart is building through acquisition, Target is building through partnership. Roundel's DirecTV pilot makes it the first retail media network to activate across DirecTV's inventory — including live programming, streaming content, and video ads served in travel and hospitality settings. Danone is the first CPG brand testing the capability.

The measurement proposition is straightforward: Target uses its first-party guest data to identify and target relevant shoppers across DirecTV's video environments, then matches ad exposure to actual Target purchases. The result is the same closed-loop attribution that Walmart is pursuing through DV360 and Yahoo DSP, achieved through a media partnership rather than a billion-dollar acquisition.

The contrast in approaches reveals something important about where the market is heading. Walmart can afford to own the stack because it has the scale and the capital. Target is demonstrating that retailers without VIZIO-scale hardware investments can still deliver closed-loop video measurement by plugging their purchase data into existing video distribution platforms. Both paths lead to the same destination: first-party purchase data as the measurement backbone for video advertising.

Why CTV Needs Retail Data More Than Retail Needs CTV

The conventional framing of this trend is that retail media networks are expanding into CTV to find new revenue. That is true but incomplete. The more important dynamic is that CTV advertising has a measurement problem that retail data uniquely solves.

CTV has grown into a $33.5 billion U.S. market in 2026, up 28% year over year. But despite that growth, CTV measurement remains fragmented. There is no cookie equivalent for television. Cross-device attribution is unreliable. And the causal link between a streaming ad impression and a purchase has been notoriously difficult to establish outside of Amazon's walled garden, where Prime Video can connect ad exposure directly to Amazon purchase data.

Retail media networks solve this by bringing deterministic purchase data — not modeled, not inferred, but actual transaction records — into the video advertising ecosystem. When Walmart Connect reports that a YouTube campaign drove incremental sales, it is matching ad exposure data from DV360 against actual Walmart purchase records. That is a fundamentally different measurement signal than what a brand gets from a standard YouTube campaign report, which relies on Google's conversion modeling.

The numbers bear this out. Retail media CTV ad spend is growing roughly three times faster than retail media search, and 85% of small advertisers now invest in CTV, up from 60% in 2024. The measurement advantage is a major driver: advertisers are moving CTV budgets to retail media-powered campaigns specifically because they can measure the sales outcome.

The Measurement Gap That Remains

Closed-loop measurement from retail media networks is powerful, but it is not the same as incrementality. Matching an ad impression to a subsequent purchase tells you that a conversion happened after exposure — it does not tell you whether the ad caused the conversion. This is the same attribution trap that has plagued digital advertising for two decades, now dressed in new clothing.

Walmart Connect, Roundel, and Kroger Precision Marketing all report campaign results using their own methodologies, and those methodologies are not standardized across networks. An advertiser running video campaigns through Walmart Connect on YouTube and through Roundel on DirecTV will get two different measurement reports using two different attribution windows, two different match methodologies, and two different baseline assumptions. Cross-network comparison remains a manual exercise.

The IAB and MRC have been working on retail media measurement standards, but progress has been slow relative to the pace of product launches. IAB Europe's Commerce Media Measurement Standards V2 introduced updated guidance on attribution windows and measurement delivery — including a default 30-day look-back window — but compliance is still voluntary and the standards focus primarily on European markets. A U.S. equivalent with teeth remains absent.

What This Means for Measurement Teams

Treat retail media closed-loop data as a signal, not ground truth. The purchase match tells you who bought after seeing an ad. It does not tell you who would have bought anyway. Until retail media networks offer native incrementality testing for their CTV products — holdout groups, geo-split experiments, matched market tests — the closed-loop data should be one input into your measurement framework, not the whole framework.

Standardize your own cross-network measurement before the industry does it for you. If you are running CTV campaigns through both Walmart Connect and Roundel, build your own attribution framework that normalizes across their different reporting methodologies. Document the attribution windows, match rates, and baseline assumptions each network uses, and flag where they diverge.

Evaluate whether owned-stack vs. partnership models affect your measurement quality. Walmart's vertically integrated approach — owning the hardware, the data, and the buying platform — may produce different measurement signals than Target's partnership model with DirecTV. The owned-stack model gives Walmart more control over the data pipeline from impression to purchase match. The partnership model introduces additional data handoffs that can introduce latency and reduce match rates.

Pressure your retail media partners for incrementality testing. Amazon DSP already offers incrementality measurement for its retail media campaigns. As Walmart, Target, and Kroger expand into video, ask whether they plan to offer native lift studies or geo-based incrementality tests for CTV campaigns. The retailers that offer true causal measurement will earn disproportionate share of video budgets from sophisticated advertisers.

The retail media-CTV convergence is the most significant structural shift in video advertising measurement since Nielsen began measuring streaming. For the first time, deterministic purchase data is being systematically connected to video ad exposure at scale across multiple retailers and multiple video platforms. The advertisers and measurement teams that build their frameworks around this new data infrastructure — while maintaining healthy skepticism about what closed-loop attribution can and cannot prove — will be the ones who extract real value from the convergence.