Stock market crash fears are growing right now because the S&P 500 Shiller CAPE ratio has climbed back above 40x, its highest level since the dot-com bubble, when it peaked near 44x. That stretched S&P 500 valuation, along with the Nasdaq’s slide into a stock market correction, has turned into a clear stock market crash warning for a lot of investors, and history shows just how painful a reversal can get.
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Stock Market Crash Risks, Dot-Com Parallels, and Defensive Investing
Why The S&P 500 Valuation Looks Like 2000
The Shiller CAPE ratio works like a price-to-earnings multiple for the S&P 500, averaging inflation-adjusted earnings over 10 years. When the dot-com bubble burst, it hit an all-time high of roughly 44x, according to The Motley Fool’s Reuben Gregg Brewer. At the time of writing, it’s back above 40x, as excitement around artificial intelligence pushed the S&P 500 valuation higher.
More stocks have hit 52-week lows than highs in recent trading, even on up days. That last happened just before the dot-com bubble burst, and the stock market crash that followed cut the S&P 500 by nearly 40% and the Nasdaq by nearly 80% over roughly three years. It’s a big part of today’s stock market crash warning.
Officials have raised the alarm on prices before. Federal Reserve Chair Jerome Powell had this to say in September 2025:
By many measures, for example, equity prices are fairly highly valued.
A few weeks later, the Bank of England stated:
The risk of a sharp market correction has increased.
Nasdaq Correction Adds To The Stock Market Crash Warning
The Nasdaq Composite has been hit the hardest, and it’s down 10.6% from its peak. The S&P 500 has lost 7.1% and the Dow 8.4%.
The index first closed in correction territory on March 26, sliding from a record 23,958 to 21,408 on tariff worries and higher oil prices. The U.S.-Iran war has since sent oil to a multiyear high. Moody’s chief economist Mark Zandi believes a sustained conflict in the Middle East could tip the U.S. economy into recession, which could turn the slide into a deeper stock market crash.
IMF Managing Director Kristalina Georgieva also stated in October 2025:
If a sharp correction were to occur, tighter financial conditions could drag down world growth.
History offers some hope. Since 2011, the Nasdaq has fallen at least 10% from a record a dozen times, and it returned an average of 22% over the following 12 months, rising in 11 of those 12 cases, per YCharts data. Still, past results guarantee nothing, and a stock market correction can run longer than expected.
How Investors Can Prepare For A Stock Market Crash
Brewer doesn’t think panic selling is the right answer to a possible stock market crash. He suggests checking your risk tolerance, letting cash pile up, moving toward sectors such as consumer staples and utilities, and trimming the biggest winners and riskiest AI bets.
Long-term holders have also survived sharp drops. The Invesco QQQ Trust, which follows the Nasdaq-100, returned 912%, or 16.6% a year, over the last 15 years, even with 12 Nasdaq corrections along the way.
Right now, the S&P 500 valuation and the price of oil are the two numbers to keep an eye on. Expensive markets can keep climbing for months. But if the 2000 script repeats, the current stock market correction could still turn into a full stock market crash before the AI rally finds its feet again.
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