Warren Buffett just gave 11 words of warning every investor should hear

"We've never had people in a more gambling mood than now." Warren Buffett delivered those 11 words during a CNBC interview at Berkshire Hathaway's (NYSE:BRK.B) annual meeting on May 2, 2026.

He wasn't telling investors to stop buying stocks, but he was pointing to behavior he believes has crossed a line. If you've been looking for signs of financial success in your portfolio, his framing of what counts as investing versus gambling may be worth a closer look.

Valuations Buffett once called 'playing with fire'

Two widely tracked gauges suggest U.S. stocks remain historically expensive. The Shiller CAPE ratio sat at roughly 41 as of early July 2026, more than double its historical average near 17, according to data from Robert Shiller's dataset published on multpl.com.

The Buffett Indicator, which compares total U.S. market capitalization to gross domestic product, reached approximately 234% in mid-July, according to GuruFocus. Buffett wrote in Fortune that when the ratio approaches 200%, investors are "playing with fire."

What the AI boom looks like through a valuation lens

Some of the market's richest valuations sit in artificial intelligence-linked names, where investor enthusiasm has outpaced what earnings alone might justify.

The Shiller CAPE has crossed 40 only twice in its roughly 145-year history, with the first occurrence during the dot-com era, according to the Motley Fool. That comparison doesn't guarantee a repeat, but it suggests that paying elevated prices for growth stories, including AI, could carry more risk than the headlines convey if earnings don't catch up.

Leveraged single-stock ETFs and the daily reset problem

Since the first leveraged single-stock exchange-traded funds launched in July 2022, the category has expanded fast. A few figures illustrate how quickly the landscape has shifted.

• Nearly 700 new ETFs have launched so far in 2026, with roughly 200 categorized as leveraged or inverse, the Motley Fool reported.
• In the first half of 2026 alone, 210 leveraged and inverse ETFs were newly listed, according to Seoul Economic Daily.
• U.S. leveraged ETF assets have surpassed $192 billion in 2026, according to ETF.com.

These products reset daily, so your returns over longer holding periods could differ sharply from the stated multiple.

Zero-day options and the line Buffett drew

Buffett was blunt about where one-day options fit. During his CNBC interview, he said buying or selling them is "not investing, it's not speculating, it's gambling, just totally," Fortune reported. The scale backing that concern is significant. Zero-day-to-expiration contracts made up roughly half of all S&P 500 options volume in 2025, according to Cboe data cited by Charles Schwab. If you trade options, that number highlights how dominant short-dated contracts have become.

'Synthetic income' funds and the yield you might not keep

A related wave involves option-income ETFs that promise high yields by selling short-dated options, often including zero-day contracts. More than 200 of these "synthetic income" ETFs have launched since early 2025, the Motley Fool reported.

The appeal is understandable if you're looking for income, but these strategies could give back gains quickly during volatile stretches because the options they sell may expire at a loss when markets move sharply against the position.

The $397 billion sitting in Treasury bills

Berkshire Hathaway ended the first quarter of 2026 with a record $397.4 billion in cash and short-term Treasury bills, Fortune reported. The conglomerate has been a net seller of equities for more than a dozen consecutive quarters.

Buffett noted that of his 60 years in business, only about five offered what he called "really juicy" buying opportunities, according to CNBC. His willingness to sit on that much cash could suggest he sees few prices worth paying right now.

What Buffett means by the casino getting 'very attractive'

Buffett compared financial markets to "a church with a casino attached" and told CNBC that "the casino has gotten very attractive to people," Fortune reported. He was careful to add that investing itself is not the problem.

Steady contributions to a retirement account or a diversified portfolio still represent the church side of his metaphor. But the explosion of products designed for intraday bets could be pulling participants toward the casino side, often without them fully recognizing the shift.

Why some investors push back on Buffett's skepticism

Not every market participant shares Buffett's caution. Bulls argue that today's elevated valuations could reflect legitimate structural shifts, including higher corporate profit margins driven by technology and the scale of global AI spending.

Critics of the Shiller CAPE note it relies on 10-year average earnings, which may underweight recent profit growth. If AI-driven productivity gains prove durable, current prices might not look as extreme in hindsight. That debate remains unresolved, which is precisely why diversification and valuation awareness could serve you well regardless of which side turns out to be right.

The long-term playbook Buffett keeps repeating

Buffett has consistently argued that understanding what you own, minding the price you pay, and staying invested through volatility tend to matter more than short-term moves. He told CNBC that "prices for an awful lot of things will look very silly" in retrospect, but stopped short of calling for a crash, according to Fortune. For individual investors, that framing could serve as a reminder to test whether your holdings reflect a long-term view or a short-term bet.

Bottom line

Buffett's 11 words were not a stock market prediction. He was pointing out that many people now treat investing more like gambling. If you're ready to start investing or reassessing your current approach, weighing valuation and risk may matter more than following whatever product or stock happens to be running.

Berkshire has been a net seller of equities for 14 consecutive quarters, according to multiple reports. That track record may say as much about the current pricing environment as any forecast could.