Walmart online sales grew 63% YoY in Q1 as the number of items sold on Walmart.com increased to 50M from 10M a year ago
Context & Ripple Effects
This Q1 print is the early proof point of Walmart's marketplace pivot: quintupling the item count on Walmart.com to 50M in a single year is how a brick-and-mortar giant manufactures an e-commerce growth rate (63%) that competes with pure-plays. The related coverage shows the strategy compounding rather than fading — online grocery pickups and deliveries carried US e-commerce to 43% growth by late 2018, and a four-day July sale built explicitly against Prime Day kept momentum at 37% the following summer.
What began as an assortment land-grab became infrastructure for later businesses: by 2024 Walmart's US ad business was growing 30% a year with eMarketer pegging it at $3.7B in retail media revenue, and its Sam's Club-led China operation was scaling one-hour delivery. The 2017 marketplace build-out is the foundation those later engines sit on.
First-order effects
- Amazon gains a domestic rival whose growth rate now matches its own core business, with a 50M-item catalog closing the selection gap that historically protected Amazon.
Second-order effects
- Competitive pressure pushes Walmart into direct confrontation tactics — counter-programming sales events against Prime Day — while the enlarged marketplace creates the traffic and product depth that later monetizes through advertising.
Third-order effects
- If the trajectory holds, Walmart consolidates its position as the clear No. 3 US online retailer — eMarketer's forecast had it overtaking Apple on 4.0% of US online spending — shifting US e-commerce from a two-horse race toward a three-platform structure where retail media becomes a second profit engine.
The trend: Walmart's decade-long e-commerce build-out shows a legacy retailer converting store scale into a multi-engine platform — marketplace, grocery, ads, and international membership — that grows faster than its core business.