Have you heard? Walmart Marketplace has recently become one of the best-kept secrets in ecommerce. If you’ve been selling exclusively on Amazon or your own site, it’s worth a look, because Walmart is growing faster than it has in years, and the sellers winning there have figured out something simple: on Walmart, speed isn’t a nice-to-have. It’s basically the whole game.
What Is Walmart Marketplace?
Walmart Marketplace lets third-party sellers list and sell products on Walmart.com alongside Walmart’s own inventory, similar in concept to Amazon’s marketplace. Shoppers browsing Walmart.com often can’t tell (and honestly don’t care) whether an item ships from a Walmart warehouse or a third-party seller. What they do care about is price, selection, and how fast the box shows up.
That last part turns out to matter more on Walmart than almost anywhere else. Walmart built its entire brand on convenience and everyday value, and it’s carried that expectation straight into its online marketplace, which is exactly why fulfillment has become the deciding factor for who wins sales there.
Walmart Marketplace Is Growing, Fast
Walmart Marketplace isn’t a fringe opportunity anymore. According to Marketplace Pulse, which tracks marketplace performance across major retailers, Walmart’s U.S. third-party marketplace grew nearly 50% year-over-year in early fiscal 2027, its fastest growth pace in years. The seller base has expanded right along with it: Walmart Marketplace has grown from roughly 160,000 active sellers in 2024 to well over 150,000 to 200,000 sellers today, depending on how you count, and third-party listings now make up the large majority of the roughly 420 million products available on Walmart.com.
Translation: Walmart Marketplace is no longer the underdog option. It’s become a genuinely competitive channel, and the window to establish yourself before it gets crowded is open right now.
Delivery Speed Decides Who Wins on Walmart Marketplace
Here’s the part sellers sometimes learn the hard way: Walmart doesn’t just prefer fast shipping, it rewards it directly, and it penalizes sellers who can’t keep up.
Walmart assigns delivery speed badges (like TwoDay) to listings based on demonstrated shipping performance, and those badges have a real effect on visibility and the Buy Box. According to Walmart’s own Marketplace resources, fast shipping is no longer a differentiator on Walmart Marketplace, it’s the baseline, and sellers offering two-day delivery on their core products routinely outperform those who don’t.
A few things make this harder than it sounds for a growing brand:
- Badges are earned, not assumed. Unlike Walmart’s own fulfillment program, a seller-fulfilled listing has to consistently hit fast delivery windows before it qualifies for the speed badges that drive visibility.
- Buy Box competition is real. When multiple sellers list the same or similar product, Walmart tends to favor the listing that can promise (and deliver) the fastest, most reliable shipping.
- Inconsistency gets punished. A seller who ships fast most of the time but misses windows during a busy week can lose standing just as easily as one who’s consistently slow.
- Returns and accuracy still count. Fast shipping doesn’t mean much if the wrong item shows up or a return takes weeks to process. Walmart’s performance metrics look at the whole fulfillment experience, not just the outbound leg.
For a brand shipping out of a garage, a single warehouse, or a fulfillment setup that wasn’t built with marketplace speed requirements in mind, this is exactly where things start to slip.
How the Right 3PL Helps You Compete on Walmart Marketplace
This is where a fulfillment partner earns its keep. Instead of trying to match Walmart’s speed expectations with a patchwork of shipping software and hope, brands working with a 3PL built for marketplace selling can offer the fast, consistent delivery Walmart rewards, without needing to build that infrastructure themselves.
ShipWizard fulfills orders from strategically located warehouses on both the East and West coasts, which shortens transit times to shoppers across the country and makes hitting two-day delivery windows realistic rather than aspirational. A few specialties matter especially for Walmart sellers:
- Clothing and apparel: Apparel sells well on Walmart Marketplace, and it also drives a lot of returns. ShipWizard’s reverse logistics capabilities keep returns from becoming the thing that drags down your seller performance score.
- Small electronics: Accurate, fast pick-and-pack keeps electronics listings in stock and shipping on time, which matters when Buy Box position can shift based on a single missed delivery window.
- Dietary supplements: Walmart’s grocery and health customer base makes supplements a natural fit, and ShipWizard’s FDA-registered, cGMP-certified warehousing means the compliance side is already handled.
- Temperature-sensitive products: Beauty, skincare, and other items that need climate-controlled storage arrive in the condition customers expect, protecting the seller ratings that Walmart weighs so heavily.
Getting Your E-Commerce Brand Set Up on Walmart Marketplace
Walmart Marketplace rewards sellers who show up ready to meet its delivery expectations from day one, and that’s a lot easier with a fulfillment partner who’s already built for it. If you’re selling, or planning to sell, apparel, electronics, supplements, or temperature-sensitive products on Walmart Marketplace, contact ShipWizard to talk through what a fast, reliable fulfillment setup could look like for your brand.
