Costco Shares Fall Amid Amazon's Expansion of Same-Day Grocery Delivery Service

Costco Wholesale Corporation's shares are trading lower after Amazon announced an expansion of its same-day grocery delivery service, directly increasing competition in the fresh groceries and household staples category where Costco competes. The added convenience of same-day delivery for Prime members could draw shoppers away from Costco stores. Costco stock is trading 1.11% lower at $979.98.

Amazon (NASDAQ:AMZN) has announced a significant expansion of its same-day grocery delivery service, which could intensify competition for Costco Wholesale Corporation (COST) in the fresh groceries and household staples market. This move is expected to impact COST's share price, as the added convenience of same-day delivery for Prime members could draw shoppers away from Costco stores.

Amazon's expansion includes introducing thousands of perishable food items, such as produce, dairy, meat, seafood, baked goods, and frozen foods, into its existing logistics network. The company aims to expand same-day delivery to over 2,300 cities and towns across the U.S. by the end of the year. This expansion builds on Amazon's initial success with perishable groceries in regions like Phoenix, Orlando, and Kansas City, where customers embraced the convenience of same-day delivery.

For Amazon Prime members, same-day delivery is free for orders over $25 in most cities. Non-Prime members can still choose same-day delivery for a $2.99 fee. This expansion could potentially reduce the number of customers visiting Costco stores, as they can now conveniently order fresh groceries alongside other items and have them delivered within hours.

The news has had an immediate impact on Costco's stock price. As of July 2, 2025, COST is trading 1.11% lower at $979.98, reflecting investor concerns about the increased competition from Amazon's expanded grocery delivery service.

This development highlights the ongoing digital transformation in the retail sector, where companies are increasingly investing in technology and logistics to meet the evolving needs of consumers. While Costco has been traditionally known for its conservative approach to growth, the company is also investing in its digital strategy to remain competitive. However, the rapid expansion of Amazon's grocery delivery service poses a significant challenge to Costco's market share and profitability.

References:
[1] https://seekingalpha.com/news/4484645-amazon-rocks-the-grocery-sector-with-a-major-expansion-of-its-same-day-delivery-service-that-includes-perishable-food
[2] https://www.businessinsider.com/costco-tech-employee-salaries-pay-revealed-2025-8