Walmart Marketplace Is Quietly Stealing Amazon Sellers at Scale

For the better part of a decade, Amazon’s third-party marketplace operated with an implicit monopoly on serious seller attention. That assumption is cracking. Walmart Marketplace, which crossed 150,000 active U.S. sellers in Q1 2026 according to internal figures shared with select agency partners, is now running what multiple sellers describe as the most aggressive recruitment campaign in its history — and it’s specifically targeting Amazon’s mid-tier: sellers doing $500K to $5M annually on FBA who are increasingly squeezed by rising referral fees, storage surcharges, and ad cost inflation.

The tactical playbook Walmart is deploying isn’t subtle. The company is offering reduced referral fees for the first 90 days, waived Walmart Fulfillment Services (WFS) onboarding fees, and, in some documented cases, dedicated Seller Success Managers who run weekly calls with transitioning brands. For sellers who’ve spent years navigating Amazon’s largely automated support infrastructure, the white-glove attention alone is generating goodwill that converts into catalog listings.

What fee differences are sellers actually seeing between Amazon FBA and WFS in 2026?

The numbers are where the conversation gets specific. On a standard 1-lb. consumer goods item retailing at $29.99, Amazon’s total FBA cost — including the 15% referral fee, fulfillment fee of approximately $4.45, and a monthly storage fee — runs to roughly $9.40 per unit at current rate tables. WFS on a comparable item runs closer to $7.80, a gap that compounds meaningfully at volume.

“We moved 40 SKUs to WFS in March and the blended cost-per-unit dropped 14% almost immediately,” said Marcus Delray, founder of Atlanta-based home organization brand ClipStack, which does approximately $3.2M annually across channels. “The pick-and-pack speed isn’t quite at Amazon’s level yet, but it’s within a day, and that gap is closing.”

“Walmart has solved the fulfillment infrastructure problem. What they’re working on now is the demand problem — and their Connect ad platform is actually starting to answer that.” — Ritu Java, CEO of PPC Ninja

💡 Article Summary

Key Insights

1

What fee differences are sellers actually seeing between Amazon FBA and WFS in 2026?

2

How is Walmart’s Buy Box algorithm different from Amazon’s — and does it matter?

3

Which product categories are migrating from Amazon to Walmart fastest?

4

Is Walmart’s review infrastructure mature enough to support serious sellers?

5

What does the multichannel inventory equation look like when splitting between FBA and WFS?

Source: Ecommerce Times

Ritu Java, whose agency PPC Ninja manages Amazon and Walmart ad spend for roughly 200 brands, says she’s seen a measurable shift in where clients are allocating new catalog investment. “Eighteen months ago, maybe 10% of our managed brands were running active Walmart Connect campaigns. Today it’s closer to 45%. The ROAS isn’t Amazon-level yet, but the CPCs are low enough that you’re getting category visibility at a fraction of the cost.”

How is Walmart’s Buy Box algorithm different from Amazon’s — and does it matter?

For sellers accustomed to gaming Amazon’s Buy Box through pricing algorithms, WFS enrollment, and velocity metrics, Walmart’s equivalent — the “Add to Cart” button placement — operates on meaningfully different inputs. Walmart’s system weights price competitiveness more heavily and deprioritizes fulfillment speed to a lesser degree than Amazon’s, which creates a different optimization surface.

Brandon Young, founder of seller education platform Seller Systems and a well-known figure in the Amazon private label community, has been publicly documenting his Walmart expansion in real time. “The Buy Box on Walmart is less about fulfillment speed and more about being the lowest price among sellers with equivalent item condition scores,” Young said. “That’s actually a more transparent system — it rewards genuine price competition rather than whoever has the best relationship with the algorithm.”

• WFS enrollment provides a “Pro Seller Badge,” Walmart’s analog to Amazon’s Prime badge, which improves conversion by an estimated 12–18% per Walmart’s own data
• Walmart’s search ranking algorithm now incorporates review recency more aggressively than Amazon’s A9/A10, meaning newer reviews carry disproportionate weight
• Walmart Connect’s sponsored product cost-per-click averaged $0.38 in Q1 2026 versus Amazon Sponsored Products’ $1.12, per Pacvue’s quarterly benchmark report
• WFS two-day delivery coverage now reaches 96% of the U.S. population, up from 88% in mid-2024

Which product categories are migrating from Amazon to Walmart fastest?

The migration isn’t uniform across categories. Home goods, pet supplies, and consumable household products are seeing the heaviest cross-listing activity, in part because these categories have high repeat-purchase rates and relatively standardized fulfillment profiles that WFS handles without friction. Electronics and apparel remain Amazon-dominant for now, though sellers in those categories are beginning to use Walmart as a secondary channel for clearance velocity and inventory drawdown.

“Pet supplements and home cleaning products are the sweet spot for Walmart right now,” said Liz Adamson, founder of Egility, an Amazon and Walmart advertising agency based in Seattle. “The customer demographics overlap heavily with Walmart’s core shopper, and the category CPCs are still low enough that you can build organic rank without a massive PPC investment on day one.”

“We’re telling every client with a consumable SKU doing over $50K monthly on Amazon to at minimum list on Walmart. Not to replace Amazon — just to own the customer relationship in a second channel before someone else does.” — Liz Adamson, Founder, Egility

Is Walmart’s review infrastructure mature enough to support serious sellers?

One persistent concern among sellers evaluating Walmart is the platform’s review ecosystem. Amazon’s review volume and velocity — even with its post-2022 crackdowns on incentivized reviews — is still orders of magnitude deeper than Walmart’s. A top-ranked Amazon listing in a competitive category might carry 4,000+ verified reviews. The Walmart equivalent often has fewer than 200.

Walmart has attempted to close this gap through two mechanisms: its Syndication program, which allows brands to port verified Amazon reviews to Walmart listings under specific eligibility criteria, and the Walmart Spark Reviewer Program, an opt-in customer review incentive. Neither fully bridges the gap, but sellers who’ve been on the platform for 18+ months say the review velocity is improving.

“The syndication tool is underused and underappreciated,” said Young. “If you’ve got 2,000 reviews on Amazon and your product qualifies for syndication, you can show up on Walmart with credibility on day one. That changes the conversion math entirely.”

Qualification for syndication requires a minimum 3.5-star average rating and at least 50 Amazon reviews, with Walmart conducting a manual quality review before approvals are granted — a process that currently takes 3–6 weeks.

What does the multichannel inventory equation look like when splitting between FBA and WFS?

The operational complexity of running parallel fulfillment networks is the most cited friction point among sellers who’ve attempted the transition. WFS and FBA have different inbound shipment requirements, different labeling specifications, and different lead time expectations. Sellers using inventory management platforms like Linnworks, Skubana (now Extensiv), or SellerCloud are generally better positioned to manage split allocation — but the tooling still requires manual configuration that smaller teams find burdensome.

“We spent about six weeks getting our WMS set up to route replenishment orders correctly between our 3PL, FBA, and WFS,” said Delray of ClipStack. “Once it was dialed in, it runs mostly on autopilot. But that six weeks was painful, and I don’t think most sellers budget for it.”

• WFS inbound shipping currently requires palletized shipments to one of six regional fulfillment centers, versus Amazon’s distributed inbound routing
• Minimum inbound quantity for WFS is 24 units per SKU per shipment
• WFS does not yet support seller-fulfilled prime equivalents, making FBM on Walmart less competitive without WFS enrollment
• Sellers using Extensiv’s multichannel module report average setup time of 18–30 hours to fully configure WFS alongside an existing FBA integration

What should Amazon sellers actually do right now about Walmart?

The consensus among agency leaders and experienced multichannel operators is consistent: Walmart is no longer a speculative bet. It’s a mature second channel with real demand, improving logistics infrastructure, and ad unit economics that are meaningfully better than Amazon’s for most categories outside of electronics and premium apparel.

The operational recommendation breaking through in seller communities right now is a phased approach: begin by listing your top 20 Amazon SKUs on Walmart without WFS enrollment to test demand signal, then migrate fulfillment to WFS for any SKU that achieves more than 15 organic orders per month within 60 days. This limits operational complexity during the learning period while identifying high-potential catalog segments before committing to WFS inbound inventory.

Java at PPC Ninja puts it directly: “The sellers who are going to regret this are the ones who wait until Walmart’s CPCs look like Amazon’s. Right now you can build category rank and review depth at a cost that won’t exist in 18 months. The window is open — it’s just not going to stay open forever.”

For Amazon-first operators, the calculus has changed. Walmart isn’t asking sellers to leave Amazon. It’s asking them to stop leaving Walmart revenue on the table — and in mid-2026, with FBA margins under sustained pressure, that argument is landing.