The Stock Market Is Sending a Major Warning. Here's What Investors Should Know Right Now.

Key Points
The S&P 500 Shiller CAPE Ratio and the Buffett indicator both suggest volatility could be looming.
While no metric can predict the future with 100% accuracy, it's still wise to prepare.
The right investments are key to protecting your portfolio.
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Americans are losing faith in the stock market, with more than 46% of investors worried that stock prices will be lower six months from now, according to the most recent weekly survey from the American Association of Individual Investors. That's up from around 36% the week prior.
History also suggests volatility could be on the horizon, with the stock market sending a warning sign for investors. Here's what to know right now.
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Multiple metrics suggest stocks are overvalued
Two popular stock market metrics many investors use to determine valuations are the S&P 500 Shiller CAPE Ratio and the Buffett indicator, and both have not-so-good news for investors.
The S&P 500 Shiller CAPE Ratio measures the S&P 500's inflation-adjusted earnings over the last 10 years. A higher ratio can signal that the market is overvalued, and historically, stock prices tend to fall after a peak.
The ratio's long-term average is around 17, and it reached a record high of 44 in December 1999, right before stocks entered a bear market. As of this writing, the ratio is approximately 39.
The Buffett indicator also measures market valuations, but it does so by comparing the total value of U.S. stocks to U.S. GDP. It's nicknamed after Warren Buffett, who used this metric to predict the onset of the dot-com bubble burst.
A higher ratio suggests the market could be overvalued. In a 2001 interview with Fortune Magazine to explain his use of this indicator, Buffett himself noted that if it nears 200%, investors are "playing with fire." As of this writing, the Buffett indicator sits at around 218%.
What this means for investors
No stock market indicator can predict the future, so these metrics don't guarantee that a recession or bear market is looming. The market landscape is also much different now than it was 20 or 30 years ago, making these metrics trickier to interpret.
That said, it's wise to start preparing your portfolio just in case a bear market is looming.
The best way to protect against volatility is to invest only in stocks from healthy companies with solid fundamentals. That includes everything from a competitive advantage to robust finances to a competent executive team.
Strong companies are still vulnerable to short-term turbulence, but the healthier their fundamentals, the more likely they are to recover from downturns and earn positive total returns over time.
The key is to maintain a long-term outlook, as bear markets can sometimes last for years. By investing in quality stocks and holding them for at least five years or so, you're far more likely to come out the other side unscathed.
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The views and opinions expressed herein are the views and opinions of the author and do not necessarily reflect those of Nasdaq, Inc.