In just the past three years, shares of Costco Wholesale (NASDAQ: COST) have doubled in value. The only stock in the "Magnificent Seven" it hasn't outperformed during this stretch is Nvidia. It has been a hotter buy than all those other popular tech stocks.

The secret behind Costco's success isn't some flashy new artificial intelligence chatbot or cutting-edge technology. Instead, the company's strong brand, customer loyalty, and solid results have made it a top growth stock for many investors.

But at nearly 50 times its trailing earnings, has the stock simply become too expensive to own? Is now the time to finally step back and stop pressing "buy" on this stock?

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Source Fool.com