Margin Debt Surges Past 65%, Warning of Severe Downturn
A rare and ominous signal is flashing in the U.S. stock market as outstanding margin debt has surged by at least 65% over a short period, according to data reported monthly by the Financial Industry Regulatory Authority (FINRA). This pattern has appeared only four times since 1997, and the previous three instances all ended in severe downturns for Wall Street.
The last three occurrences of this magnitude preceded the dot-com bust in the early 2000s, the 2008 global financial crisis, and the sharp but brutal bear market triggered by the Covid-19 pandemic in 2020. In each case, the unwinding of leveraged positions accelerated the selloff, turning what might have been an ordinary correction into a rout.
Warren Buffett, the chairman of Berkshire Hathaway, has been delivering a blunt message that echoes the margin-debt warning. Speaking with CNBC's Becky Quick during Berkshire's annual meeting in May 2026, Buffett said the market is in the middle of a 'gambling boom,' describing financial markets as a church with a casino attached.
The current environment is different from the dot-com bubble, however, as the largest companies in the S&P 500 are generating real profits at enormous scale. Apple, Microsoft, Nvidia, and Alphabet reported combined profits of more than $400 billion in the most recent fiscal year. Despite this, two widely followed valuation metrics - the 'Buffett indicator' and the Shiller CAPE ratio - are at levels that have historically preceded trouble.