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 ...