Key Points Costco's massive scale, coupled with a limited number of stock-keeping units at its warehouses, results in a notable cost advantage. Same-store sales have steadily increased in the past, indicating a resilient business model. Costco stock currently trades 18% below its all-time record, but the valuation still provides no margin of safety. 10 stocks we like better than Costco Wholesale › With $69 billion in third-quarter 2026 (ended May 10) net sales, Costco Wholesale (NASDAQ: COST) is the world's third-largest retailer. Only Walmart and Amazon are ahead in the rankings. Within this sector, Costco has cemented its position as the dominant warehouse club operator.
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