Costco Wholesale Corporation

Costco Wholesale Corporation is an American membership warehouse club operator that sells a limited selection of nationally branded and private-label products across a wide range of categories at low prices, generating $275.2 billion in total revenue in fiscal 2025. With 914 warehouses worldwide, 81 million paid members, and a 92.3% renewal rate in its core US and Canadian markets, Costco operates one of the most durable retail models ever built — a business where the customer pays for the right to shop and the company earns essentially all of its profit from that membership fee, selling merchandise at cost-plus-nothing.

The file turns on a single question: whether the premium multiple the market assigns to Costco — roughly 48 times trailing earnings — is an insurance policy on a compounder that still has decades of unit growth and margin opportunity ahead of it, or a valuation that already prices in the best-case outcome for a business whose North American footprint is maturing and whose international expansion, while real, is too small to move the needle at this scale. The answer depends less on next quarter's comparable sales print than on the arc of three slow-moving forces: membership model durability in an AI-mediated shopping world, Kirkland Signature's ability to keep widening the value gap, and the pace at which international warehouses can close the productivity gap with their US counterparts.

This is a report about a business that is almost universally admired and almost universally expensive. The analysis that follows does not attempt to call a top or a bottom — it attempts to lay out the machinery clearly enough that the reader can judge for themselves what is already priced in and what is not.