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Costco stock is trading at more than 50 times earnings for the second time in its history. What happened last time may be an indication of what to expect this time.

    Imagine if you could buy a company that makes $100,000 in annual profits for $1 million. In investment jargon, you'd say this company trades at ten times its earnings, or a price-to-earnings (P/E) ratio of 10. It's useful. In this specific scenario, the purchase price would be recouped after 10 years. In year 11 and beyond, the investor could make serious money.

    Of course, it's too simplistic a way of looking at things. In the real world, income is rarely static. But it still shows how a price-to-earnings ratio works and why, if at all possible, you would want to buy a company at a lower price-to-earnings ratio.

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    Buy shares of Costco Wholesale (NASDAQ: COST) with a lower price/earnings ratio not possible at this time. At the time of writing, Costco stock is trading at 55 times its earnings, marking only the second time in its history that its price-to-earnings ratio has exceeded 50.

    COST PE ratio chart
    COST PE ratio data per YCharts

    Costco stock is up about 60% in the past year, crushing its price S&P500 and therefore attracts a lot of attention from investors. But should investors buy when the price/earnings ratio is so high? Well, investors can use history to guide that decision.

    In early 1999, Costco's shares rose more than 50 times their earnings. The famous dotcom bubble in the stock market was in full swing at the time. Costco stock would hit an all-time high (at the time) in early 2000, just as the stock market bubble was about to burst. Eventually it popped and Costco stock lost about 50% of its value by the end of 2002.

    Keep in mind that Costco's business continued to perform quite well during this period. From early 2000 to late 2002, both sales and earnings per share (EPS) increased. But the share was still halved.

    COST chart
    COST data by YCharts

    You could say it's irrelevant to note that Costco's price-to-earnings ratio was above 50 at the time. After all, when a bubble bursts, almost all stocks go down, regardless of valuation. But you could also argue that Costco's lofty valuation was immediate result of the bubble, making it very relevant indeed.

    It is possible that the S&P500 is currently back in bubble territory. From a price-to-earnings ratio perspective, the S&P 500 is currently trading at its second-highest valuation since the dot-com bubble burst over two decades ago. The only other time it was more expensive was in 2021, just before it plummeted in 2022.

    In other words, Costco's price-to-earnings ratio is back above 50 and an overvalued market could be the culprit, just like it was in 2000. And then Costco shares fell more than 50%.