S&P 500 funding costs hit 15-year high, driven by leveraged ETFs

S&P 500 synthetic equity funding costs reached the 99th percentile of their 15-year range.

Societe Generale analysts labeled the unusual seasonal spike a mid-year heatwave. Current short-term funding rates exceed previous seasonal highs by 40% to 45%.

Retail participation in leveraged ETFs and rising hedge fund leverage drive the stress. Leveraged ETF assets under management grew 75% since late March. A rally in semiconductor stocks fueled the majority of this asset growth. Funding cost increases remain disproportionate to recent S&P 500 returns.