Warren Buffett Just Gave Investors a 10-Word Warning About the Stock Market. History Shows That He's Probably Right.

Warren Buffett is no longer a net seller of stocks. For 14 consecutive quarters, he sold more shares of companies than he bought for Berkshire Hathaway's (NYSE:BRKA) (NYSE:BRKB) portfolio. In the second quarter of 2026, though, Buffett and new CEO Greg Abel used some of Berkshire's enormous cash stockpile to invest heavily in stocks.

Does this mean that Buffett views the stock market as attractive? Not at all. A few weeks ago, he spoke with CNBC's Becky Quick. That interview underscored Buffett's view that it's wise to be cautious about investing in stocks in the current environment -- and history shows he's probably right.

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Buffett's 10-word warning

Quick directly asked Buffett about today's market dynamics. He replied, "It's tough to find value when everybody is preferring gambling."

Buffett likes to buy stocks. He'd rather Berkshire's massive cash position be lower, and its total equity position be higher. Before comparing investors to gamblers in his July CNBC interview, Buffett told Quick, "I think there are times when opportunities are just thrown at you so fast you can't, you know, it's unbelievable." However, like his mentor Benjamin Graham, Buffett remains a value investor at heart. Based on his comments, he doesn't see many bargains available.

But is his 10-word response really a warning to investors? I think so. His choice of words is important.

Perhaps the most striking word in Buffett's response to Quick was "gambling." The legendary investor has used the term several times in the past. For example, he used a gambling reference in speaking about the stock market in April 2022. Within two months, the S&P 500 was in a correction.

Why Buffett is right

Even the famed "Oracle of Omaha" can be wrong, though. Buffett had readily admitted to making mistakes in the past. But history suggests that his 10-word warning was probably right.

The valuation metric that bears Buffett's name -- the Buffett indicator -- measures the ratio of total stock market capitalization to gross domestic product (GDP). This ratio currently stands at nearly 238%, its highest level ever. In 2001, Buffett stated in a Fortune magazine article that investors were "playing with fire" if the metric approached 200%.

The Buffett indicator reached this dangerous level in late 1999 and early 2000. The dot-com bubble burst soon afterward. The ratio of total stock market capitalization to GDP also came close to hitting 200% in November 2021. A bear market began only a few weeks later.

Another valuation metric, the S&P 500 Shiller CAPE (cyclically adjusted price-to-earnings) ratio, is above 41. The ratio has only been this high for a brief period once before -- in late 1999 and early 2000. And we just discussed what happened next.

Is Buffett being hypocritical?

Some might view Buffett's 10-word response in the CNBC interview as at odds with Berkshire Hathaway's Q2 buying spree. However, Buffett isn't being hypocritical.

Berkshire's biggest Q2 investments, by far, were in Alphabet (NASDAQ:GOOG) (NASDAQ:GOOGL). You could make a pretty good case that Google's parent is a bargain. Alphabet's shares trade at roughly 16.8 times forward earnings. That's the lowest forward price-to-earnings ratio among the so-called "Magnificent Seven" stocks and well below the S&P 500's (SNPINDEX:^GSPC) forward earnings multiple of 19.9.

And Buffett was the brains behind the Alphabet purchases, by the way. He told Quick as much in the interview last month. Buffett added, though, that he works alongside Abel, saying, "I am not doing anything that he doesn't approve of."

History shows that when Buffett uses the term "gambling" in relation to the stock market, investors should pay attention. But Berkshire's significant increase in its stake in Alphabet underscores something important: Just because it's difficult to find value in an overpriced market doesn't mean that there aren't any stocks with attractive valuations.

Keith Speights has positions in Alphabet and Berkshire Hathaway. The Motley Fool has positions in and recommends Alphabet and Berkshire Hathaway. The Motley Fool has a disclosure policy.