The Marketplace Seller Is Three Things at OnceNarrow moat
Walmart (WMT) — moat facet
Customer, supplier and competitor — and Walmart bills it for two of the three.
A Walmart marketplace seller is a customer, a supplier and a competitor, and is billed for two of those roles.
The customer part: the seller pays a commission on each sale, pays for fulfilment if it uses Walmart Fulfillment Services, and pays for advertising if it wants to be found — and 83% of Walmart's top marketplace sellers do buy advertising1. The supplier part: the seller provides inventory Walmart never bought, never warehoused and never marked down, in categories where Walmart's own buying is weakest. The competitor part: in any category Walmart also stocks, the seller's listing is taking a sale Walmart could have made at a full gross margin instead of a commission.
That is a good bargain for Walmart while the marketplace is filling gaps and a more complicated one as it grows. Marketplace sales rose 52% in the June 2026 quarter against 23% for eCommerce overall2, which means the third-party half is now doing most of the work in Walmart's fastest-growing channel.
The strategic logic is Amazon's, executed a decade later and without Amazon's cost base. A marketplace is the only way a retailer with a hundred and twenty thousand items can offer the millions that an online customer expects, and the only way to do it without capital. It also generates the advertising demand that makes the media business work.
The risk is the one every marketplace carries: counterfeits, service failures and quality dispersion attach to Walmart's name rather than to the seller's, in a brand built on the customer not having to think about any of that.
The number that matters is marketplace growth against total eCommerce growth — 52% against 23%3. A widening gap says the assortment problem is being solved; it also says a growing share of Walmart's digital sales are at a commission rather than a margin.
Marketplace sales grew 52% in the June quarter and 83% of top sellers buy advertising, so the seller base is growing and monetising at the same time. The qualification is that it grows by taking sales Walmart could have made at a full margin.
Walmart's own data, alongside the claim that advertising sellers generate on average seven times the sales of non-advertising ones. The seller is a customer, a supplier and a competitor, and Walmart bills it for two of the three.
Source: Walmart Connect disclosures ↗- ReportedThe customer part: the seller pays a commission on each sale, pays for fulfilment if it uses Walmart Fulfillment Services, and pays for advertising if it wants to be found — and 83% of Walmart's top marketplace sellers do buy advertising.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 ↗
- ReportedMarketplace sales rose 52% in the June 2026 quarter against 23% for eCommerce overall, which means the third-party half is now doing most of the work in Walmart's fastest-growing channel.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 ↗
- ReportedThe number that matters is 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 ↗