Costco’s sales were hot, but the stock still got cold feet

Sales? Growing. Investors? Not impressed.

Costco came in with a pretty solid flex for Q3: sales growth hit 12%, powered by stronger same-store sales, higher ticket sizes, and more people wandering the aisles like it’s a treasure hunt with snacks at the end. Membership renewals also stayed sticky at 92%, which is basically the retail version of having a fan club that never leaves.

The Costco formula keeps doing Costco things

That renewal rate matters because Costco’s model isn’t just about moving pallets of giant cereal boxes. It’s about getting members to keep paying for the privilege of buying in bulk, then making them feel smart about it. When traffic is up and customers are spending more per visit, that’s usually a good sign the machine is humming.

So why did the stock fall?

That’s the million-dollar question, and maybe also the billion-dollar one if you’re staring at the chart. Sometimes a stock dips not because the business is weak, but because expectations were already wearing a superhero cape. If investors wanted even more explosive growth, a very good quarter can still look… merely good.

Big picture

For long-term investors, Costco’s update says the engine is still running smoothly. The short-term stock move is the market being the market — moody, dramatic, and a little impossible to please.