Outstanding margin debt has surged 77% in 14 months to an all-time high of $1.502 trillion, matching a pattern that preceded every major U.S. stock market decline over the past three decades. The S&P 500, Dow Jones Industrial Average, and Nasdaq Composite have all posted strong gains under President Trump, but the same borrowing spike flashed before the dot-com crash, the 2007-2008 financial crisis, and the 2022 bear market.
Wall Street trio extends gains
The S&P 500 climbed 0.51% to 7,743.41, while the Dow Jones Industrial Average and Nasdaq Composite gained 0.93% and 0.48%, respectively. Since Donald Trump's second term began on Jan. 20, 2025, the Dow, S&P 500, and Nasdaq are up 19%, 28%, and 35%, respectively.
Record buybacks, an artificial intelligence infrastructure build-out, and stronger-than-expected corporate earnings have driven the bull market since Trump took office. But according to Motley Fool contributor Sean Williams, one crude measure of investor risk-taking is now flashing a historically reliable warning.
Margin debt hits an all-time high
Outstanding margin debt jumped from nearly $851 billion in April 2025 to an all-time high of $1.502 trillion in June 2026, according to FINRA data. That is only the fourth time in three decades that margin debt has risen at least 65% over a short stretch, and each prior instance was followed by a market decline.
Between March 1999 and March 2000, margin debt leaped 80% to nearly $300 billion, and the S&P 500 and Nasdaq Composite subsequently lost 49% and 78% of their value over the following two years. From June 2006 to July 2007, margin debt rose 66% to about $416 billion, and the S&P 500 plummeted 57% during the Great Recession. Margin debt also climbed 95% between March 2020 and October 2021, and the 2022 bear market began just three months after that peak.
Using leverage to buy stocks can amplify gains, but it can also magnify losses if a security moves against the investor, which is why rapid increases in margin debt have historically foreshadowed trouble.
History favors patient investors
Williams notes that history cannot guarantee a crash, but downturns have historically resolved quickly. Bespoke Investment Group data going back 97 years, to the start of the Great Depression, shows the average S&P 500 bear market has lasted 286 calendar days, with none of the 27 bear markets over that span exceeding 630 days. Bull markets, by contrast, have lasted about 3.6 times as long on average.
Source: Fool
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