U.S. Stock Market Margin Debt Hits Record $1.5 Trillion

Outstanding margin debt in the U.S. stock market reached an all-time high of $1.502 trillion as of June 2026. This represents a 77% increase between April 2025 and June 2026, driven largely by investor enthusiasm surrounding artificial intelligence data center build-outs.

Data from the Financial Industry Regulatory Authority indicates this is only the fourth time since 1997 that margin debt has surged by at least 65% over such a short period. The previous three instances of parabolic debt growth preceded major market collapses: the 2000 dot-com bubble, the 2008 Great Recession, and the 2022 bear market.

While S&P 500 valuations remain near historic highs, the rapid rise in borrowed capital to leverage portfolios is viewed as a critical warning sign for a potential market pullback. Historically, these spikes in margin debt have served as more immediate indicators of instability than general valuation highs, despite the fact that bull markets typically last longer than bear markets.