Walmart Marketplace vs Amazon Marketplace: The Real Comparison for Sellers in 2026

For most of the past decade, Amazon Marketplace was the only marketplace that mattered for serious U.S. third-party sellers. That has changed. Walmart Marketplace has grown its seller base into the hundreds of thousands, expanded internationally, integrated Walmart Fulfillment Services and built out Walmart Connect into a credible advertising network. The result is the first genuine two-rail third-party marketplace landscape in modern U.S. retail.

Scale and customer base Amazon remains substantially larger by GMV, by Prime household penetration and by sheer category coverage. Walmart's marketplace is smaller but growing faster, and serves a customer base that skews more toward grocery, household essentials, value apparel and middle-income buyers in markets where the Walmart store footprint is dominant. The two customer pools overlap heavily but not entirely.

Fees and economics Amazon's referral fees, FBA storage and fulfilment fees, long-term storage charges and increasingly its inbound placement fees have made the all-in cost of selling on Amazon materially higher than five years ago. Walmart's fee structure is generally simpler and often lower, with no monthly subscription and category-based referral fees that tend to undercut Amazon's on equivalent products. For thin-margin categories, that gap is meaningful.

Fulfilment: FBA vs WFS Amazon's FBA network remains the most capable consumer-fulfilment system in the world, with same-day and next-day coverage that no competitor fully matches. Walmart Fulfillment Services has closed a substantial portion of that gap, particularly for two-day delivery on standard-size items, and benefits from integration with Walmart's store network for ship-from-store and pickup options. For sellers, the practical question is rarely either-or — many large operators run both.

Advertising and discovery Amazon Ads is now one of the largest digital advertising businesses in the world, and sponsored placements are increasingly required to maintain visibility in competitive categories. Walmart Connect is smaller but growing rapidly, with lower CPCs in many categories and a less crowded auction. For brands building a new channel, the cost-of-discovery curve on Walmart can be more forgiving than on Amazon today.

Approval, gating and seller experience Walmart Marketplace has historically been more selective about onboarding sellers than Amazon, with a stricter application process and tighter performance standards. That gating reduces the volume of low-quality competitors that Amazon sellers have to fight against. Amazon's seller experience, by contrast, is more mature but increasingly contentious — fee changes, account suspensions and brand-gating issues are recurring complaints from large sellers.

Brand control and the wholesale question Amazon's hybrid model — first-party Vendor Central plus third-party Seller Central — creates well-known channel-conflict and brand-control challenges that have pushed many established brands to favour third-party as the primary route. Walmart's approach is more clearly third-party for marketplace sellers, with its own first-party assortment managed separately. For brand owners, that separation is often easier to manage.

The right strategy for most U.S. third-party sellers in 2026 is no longer Amazon-only. It is Amazon-led, Walmart-supported, with a clear-eyed view of where each platform actually pays.

International expansion Walmart Marketplace has expanded into Mexico and Canada and is developing further international capability through its broader retail network. Amazon's international marketplace footprint remains substantially larger, with mature operations across Europe, Japan and a growing Indian business. For sellers with international ambitions, Amazon still offers the broader runway.

What to watch next Expect Walmart Connect to keep narrowing the advertising gap, WFS to keep extending fulfilment capability, and the seller approval gate to remain a defining feature of the Walmart experience. Expect Amazon to continue refining fees, tightening brand controls and pushing further into agentic shopping. The right strategy for most serious U.S. sellers is no longer single-platform — it is a deliberate, channel-specific operating model on each.