Investors are keeping an eye on business trends.

On Sept. 25, Costco Wholesale ( COST 0.13% ) reported completed financial results for its fiscal 2025. And the stock immediately dropped. To be clear, the drop for Costco stock was extremely modest at around 3%. But a drop of any size would seem to indicate that investors were unenthused with the company's financial results, at best. And at worst, they're concerned.

I believe that investors are leaning more toward the concerned side of the spectrum when it comes to Costco. As a retailer, same-store sales (or comparable sales) are an important metric. For the fourth quarter, the company's comparable sales were up 5.7%. That's good, but lower than expected.

Is this really a big deal for Costco investors with a long-term perspect

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