Margin Debt Surges to New Record, Raising Costs for Investors

The US stock market has been experiencing a rally fueled by borrowed money, and this trend is now becoming more expensive. According to FINRA data, margin debt surged to an all-time record of $1.42 trillion in May 2026, representing an 8.5% increase from April and a 53.7% rise compared to the same period last year.

The leverage machine behind this rally is significant, with leveraged exchange-traded funds driving over $100 billion in net buying activity in the prior month, concentrated heavily in semiconductor stocks. Hedge funds are also carrying gross equity exposure estimated at around $10 trillion.

Banks are feeling the pressure on their balance sheets due to record margin lending and prime brokerage activity for hedge funds. When banks hit capacity limits, they raise rates or tighten terms, making it more expensive for investors to borrow money. This development is particularly notable because it suggests that the pace of leverage accumulation has been accelerating.

The rising cost of equity financing could have a ripple effect on the broader market, including digital assets such as Bitcoin and Ethereum, which have shown increasing correlation with equities during periods of deleveraging. The same pools of institutional capital that serve hedge funds in equities also provide services to crypto-native funds and trading desks.