Walmart's competitive advantage rests on its physical footprint: 4,700 stores enable same-day delivery to 95% of U.S. households, with 25% of orders fulfilled within one hour using store inventory. The company has cut net delivery costs by 20% through fulfillment automation and deploys AI tools like its Sparky assistant. Amazon has responded by closing Amazon Fresh and Go stores as of January 2026 while expanding same-day perishables, which have grown 40 times since January 2025. In grocery specifically, Walmart commands 28% of online market share versus Amazon's 22%, and 21% of total U.S. grocery sales.
Attorneys should monitor Walmart's leadership transition—incoming CEO John Furner takes over in February 2026—and the company's accelerating AI partnerships with OpenAI and drone delivery pilots in five states. The shift reflects a decade-long digital investment that has positioned Walmart to capture higher-income households, which drove 75% of gains in Q3 2025 and spend 1.5 times more than lower-income customers. This strategy threatens Amazon's dominance outside grocery while establishing Walmart as the clear leader in online food retail.