Walmart Connect Doubles Down on Offsite Ads, Threatening Amazon’s DSP Lock-In

Walmart Connect quietly flipped the switch on its expanded offsite advertising network in late July 2026, and the ripple effects are now hitting agency trading desks hard. The program — which allows Walmart marketplace sellers and CPG brands to extend first-party retail media data beyond Walmart.com into Meta, connected television, and open-web display inventory — is generating enough early performance data to force a serious reallocation conversation at brands that have historically treated Amazon DSP as their default closed-loop programmatic stack.

The timing is deliberate. Amazon’s DSP has faced growing seller frustration over rising CPMs — up an estimated 18% year-over-year through Q2 2026 according to Tinuiti’s most recent retail media benchmark report — and a lack of cross-retailer flexibility. Walmart, which has been investing heavily in its LiveRamp data clean room integration and a revamped demand-side interface built on The Trade Desk’s infrastructure, is now positioned to absorb that frustration with a credible alternative.

What exactly did Walmart Connect launch, and how does it differ from Amazon DSP?

Walmart Connect’s offsite network, internally referred to as “Walmart Connect Amplified,” allows advertisers to activate Walmart’s first-party purchase and browsing data — built from 270 million weekly U.S. store and digital shoppers — against inventory purchased programmatically outside of Walmart.com. The critical architectural difference from Amazon’s DSP is the underlying pipe: Walmart is routing buys through The Trade Desk rather than a proprietary DSP, giving media buyers access to TTD’s full inventory universe and attribution tooling without being walled into a single ecosystem.

Amazon DSP, by contrast, routes display and video spend primarily through Amazon’s own publisher network and Twitch, with Fire TV serving as the main CTV surface. While Amazon’s closed-loop attribution is genuinely strong for bottom-funnel ROAS measurement, it creates real friction for brands trying to run unified cross-channel campaigns that include non-Amazon CTV publishers like Peacock, Tubi, or Roku.

“We moved 30% of our Q3 DSP budget into Walmart Connect Amplified in August and we’re already seeing CPMs come in around $14 versus the $18-$19 we were paying on Amazon’s network for comparable audience segments. The attribution is cleaner than we expected because the TTD integration lets us unify our MTA model.” — Sarah Okonkwo, VP of Performance Marketing, Olly PBC

💡 Article Summary

Key Insights

1

What exactly did Walmart Connect launch, and how does it differ from Amazon DSP?

2

Which seller and brand profiles are seeing the biggest early wins?

3

How is Amazon responding to the competitive pressure on DSP?

4

What does this mean for Q4 2026 holiday media planning?

5

Are there measurement and attribution gaps brands should know about?

Source: Ecommerce Times

Which seller and brand profiles are seeing the biggest early wins?

The early adopter profile skews toward mid-market CPG and health-and-wellness brands that sell meaningfully on both Amazon and Walmart.com, giving them a credible reason to activate Walmart’s first-party data for prospecting while still measuring downstream purchases across channels. Brands with a single-marketplace presence get less out of the offsite network because the attribution loop back to Walmart conversion data is where the product earns its margin over generic programmatic buys.

Agency leaders running managed service programs are also prioritizing clients in these categories:

• Personal care and OTC health brands with SKU overlap between Amazon and Walmart.com
• Food and beverage brands running Walmart+ member acquisition alongside retail media
• Home goods sellers with high average order values where CTV upper-funnel spend has historically been hard to justify on Amazon DSP alone
• DTC brands that have recently onboarded to Walmart.com and need an efficient awareness vehicle tied to first-party retail data rather than Meta’s modeled audiences

Tinuiti’s retail media group, which manages over $900 million in annual retail media spend, has already briefed several of its top CPG clients on shifting Q4 budget allocation. The firm’s EVP of Retail Media, Evan Facinger, has been vocal internally about the structural advantage of the TTD backbone, though the firm has not yet published public guidance on recommended budget splits.

How is Amazon responding to the competitive pressure on DSP?

Amazon has not been passive. In June 2026, the company quietly expanded Amazon Marketing Cloud’s clean room capabilities to support third-party data onboarding from LiveRamp and Snowflake, a direct response to Walmart’s data clean room narrative. Amazon also announced a deeper Fire TV and Freevee inventory integration for DSP buyers in Q3, adding roughly 45 million addressable CTV households to the network.

“Amazon still has the strongest closed-loop attribution in retail media, full stop. If your primary conversion surface is Amazon.com, the DSP is hard to beat on efficiency. But Walmart is now a legitimate second channel rather than an afterthought, and that changes the portfolio math for brands above $50 million in retail media spend.” — Jason Hartline, Managing Director, Commerce at Publicis Commerce

Amazon is also believed to be in late-stage testing of a “Retail Media Exchange” product that would allow Amazon DSP advertisers to bid against Amazon first-party audience segments on publisher inventory outside Amazon-owned properties — a structural concession that mirrors what Walmart Connect Amplified already offers through TTD. Industry sources expect an announcement before the November 2026 upfront season.

What does this mean for Q4 2026 holiday media planning?

The practical impact for sellers and DTC brands entering Q4 planning is a more competitive offsite programmatic market. Walmart Connect Amplified enters the holiday season with a credible audience scale story — Walmart’s first-party data covers significantly more lower-income and rural household segments than Amazon’s audience base, which skews urban and Prime-heavy. For brands selling at accessible price points, that demographic reach during the holiday stretch from November 1 through December 20 is legitimately differentiated inventory.

Agency planners are currently modeling three budget scenarios for Q4 retail media clients:

• Amazon-heavy (70/30 Amazon-Walmart split): Appropriate for brands where Amazon.com accounts for more than 60% of e-commerce revenue and Prime member conversion data is the primary attribution signal
• Balanced (50/50 split): Recommended for multi-retailer brands with meaningful Walmart.com velocity and product categories (grocery, OTC, pet) where Walmart shopper demographics over-index
• Walmart-tilted (40/60 split): Experimental but being tested by at least three major CPG brands in the Tinuiti portfolio, premised on CPM arbitrage and Walmart+’s accelerating membership base (now estimated at 38 million paid subscribers per Bloomberg Second Measure data through July 2026)

The CPM arbitrage window is real but likely temporary. As more budgets rotate into Walmart Connect Amplified’s programmatic supply, auction pressure will compress the current spread. Brands that lock in upfront commitments with Walmart Connect before the Q4 rush are expected to receive preferred audience access and inventory guarantees — the same mechanics that made Amazon DSP upfront deals valuable in 2022 and 2023 before the market matured.

Are there measurement and attribution gaps brands should know about?

Walmart Connect Amplified is not without friction. Several agency leads flagged a persistent gap in Walmart’s ability to close the loop on in-store purchase attribution for offsite impressions, a limitation that matters significantly for brands where more than 40% of Walmart revenue flows through physical stores rather than Walmart.com. Amazon’s attribution, while closed to non-Amazon surfaces, is structurally cleaner for pure-play e-commerce measurement.

“The in-store attribution gap is Walmart’s Achilles heel in this pitch. They’re working on it through their Walmart Luminate platform and the store-level clean room data, but it’s not ready for production use at most of our clients. If your brand is 60% in-store at Walmart, the offsite ROI story gets murkier fast.” — Priya Menon, Head of Retail Media Strategy, Wpromote

Walmart is actively developing what it calls “Omni Attribution” within Walmart Luminate, its data platform, which would connect offsite ad impressions to in-store purchase events at the household level. Beta access to Omni Attribution is reportedly available to a small number of enterprise advertisers spending above $5 million annually on Walmart Connect, with a broader rollout targeted for Q1 2027.

What should Shopify and marketplace sellers actually do right now?

For most Shopify-native DTC brands that have recently expanded onto Walmart.com — a group that grew significantly in 2025 following Shopify’s deep integration with Walmart Marketplace’s onboarding API — the immediate playbook is relatively straightforward. Brands clearing more than $500,000 in annual Walmart.com GMV now have enough first-party purchase signal in Walmart’s ecosystem to make offsite activation meaningful. Below that threshold, the audience match rates on Walmart Connect Amplified tend to be too thin to justify the operational overhead of a separate programmatic buy.

For established marketplace operators already running Amazon DSP at scale, the strategic move is incremental testing rather than wholesale reallocation. Running a 10-15% budget shift from Amazon DSP into Walmart Connect Amplified during September and October — ahead of Q4 peak pricing — gives teams real performance comparisons before the holiday window tightens inventory across both platforms. The brands that will win Q4 2026 retail media are the ones that have benchmark data in hand by October 1, not the ones still negotiating upfront packages in mid-November.

Walmart’s next scheduled Connect partner briefing is set for September 9 in Bentonville, where the company is expected to preview additional CTV publisher partnerships and a self-serve interface update designed specifically for mid-market sellers managing spend below $250,000 per quarter — a clear signal that the platform is no longer content to compete only for enterprise CPG budgets.