The MarketplaceNarrow moat
Walmart (WMT) — moat facet
The fastest-growing line in Walmart is inventory Walmart does not own.
The fastest-growing line in Walmart is inventory Walmart does not own.
Marketplace sales grew 52% in the June 2026 quarter1, against 23% for eCommerce overall and 5.9% for net sales. Third-party sellers list on Walmart's site, Walmart takes a commission, and the goods are either shipped by the seller or handled by Walmart Fulfillment Services for an additional fee. Walmart buys nothing, holds nothing and marks nothing down.
The economics of this are close to ideal for a retailer with Walmart's problem. Assortment is what a store cannot offer — a supercenter holds around a hundred and twenty thousand items and the internet expects millions — and a marketplace supplies it without capital. It also does something subtler: it fixes the general merchandise gap. The long tail of categories where Walmart's own buying is weakest is exactly where third-party sellers are strongest.
And it feeds the advertising business directly. Sellers compete for visibility on a site where visibility determines sales, which is why 83% of Walmart's top marketplace sellers buy advertising2 and why the two lines grow together.
The costs are real. A marketplace imports counterfeit risk, quality variance and customer-service problems that a controlled assortment does not have, and Walmart's brand promise is built on the customer not having to think about any of that. It also cannibalises: every marketplace sale in a category Walmart stocks is a first-party sale it did not make, at a commission instead of a gross margin.
Grade it on marketplace growth against total eCommerce growth: 52% against 23%3. The wider that gap, the more of Walmart's digital business is somebody else's inventory.
Marketplace sales grew 52% against 23% for eCommerce overall, which is the assortment problem being solved without capital and the advertising demand being created at the same time. The qualification is that a growing share of Walmart's digital sales now earn a commission rather than a margin.
Against 23% for eCommerce overall, on inventory Walmart never bought, stored or marked down. The wider that gap, the more of Walmart's digital business is somebody else's goods at a commission rather than its own at a margin.
Source: Walmart second-quarter fiscal 2027 results (August 20, 2026) ↗- ReportedMarketplace sales grew 52% in the June 2026 quarter, against 23% for eCommerce overall and 5.9% for net sales.Walmart second-quarter fiscal 2027 earnings presentation (Form 8-K exhibit 99.2) - Walmart U.S. comp sales +2.6% with transactions excluding fuel +1.5% and average ticket excluding fuel +1.1% against total like-for-like inflation of 1.4%, and an approximately 125 basis point pharmacy headwind from maximum fair price regulation; eCommerce +24% including approximately 43% growth in store-fulfilled delivery, total advertising +38% including Walmart Connect +43%, and Marketplace sales +52%; expedited deliveries under three hours approximately 37% of store-fulfilled orders; share gains across categories and income tiers led by upper-income households — Q2 FY2027 · publ. August 20, 2026 · source ↗
- ReportedSellers compete for visibility on a site where visibility determines sales, which is why 83% of Walmart's top marketplace sellers buy advertising and why the two lines grow together.Walmart Connect - the U.S. retail media business reaches more than 150 million weekly customers through omnichannel solutions; Walmart's first-party data states that advertising sellers generate on average seven times the sales of non-advertising sellers and that 83% of top Marketplace sellers advertise on Connect — 2026 · publ. June 22, 2026 · source ↗
- ReportedGrade it on marketplace growth against total eCommerce growth: 52% against 23%.Walmart second-quarter fiscal 2027 earnings presentation (Form 8-K exhibit 99.2) - Walmart U.S. comp sales +2.6% with transactions excluding fuel +1.5% and average ticket excluding fuel +1.1% against total like-for-like inflation of 1.4%, and an approximately 125 basis point pharmacy headwind from maximum fair price regulation; eCommerce +24% including approximately 43% growth in store-fulfilled delivery, total advertising +38% including Walmart Connect +43%, and Marketplace sales +52%; expedited deliveries under three hours approximately 37% of store-fulfilled orders; share gains across categories and income tiers led by upper-income households — Q2 FY2027 · publ. August 20, 2026 · source ↗