US equity financing costs surge as margin debt hits $1.4 trillion

Borrowed money that fuels the U.S. stock rally is becoming increasingly expensive. Primary dealers now hold a record $220 billion in equity repo exposure, and market spreads between S&P 500 futures financing rates and benchmark SOFR have risen to their highest levels since late 2020. The higher cost of equity funding could deter leveraged trades that rely on cheap borrowing.

Assets in U.S.-domiciled leveraged exchange‑traded products have doubled to roughly $200 billion, while margin debt reached a record $1.4 trillion in May 2026 – a 54 % year‑over‑year increase. Aggressive options activity and the growth of 2×–3× leveraged ETFs add further synthetic exposure, amplifying market volatility. Analysts note that rising real interest rates and tighter bank balance‑sheet capacity may curb the current market euphoria, especially as AI‑related chip spending continues to drive equity gains.

Barclays estimates that a 10 % rise in equities could generate about $1 trillion of additional financing demand, adding $150‑$200 billion of risk‑weighted assets for banks. The Treasury repo market remains accommodative, but the strain on capital‑intensive equity financing is a warning sign for investors and financial institutions.