US equity financing costs have surged to levels typically associated with year end stress, raising concerns that growing demand for leveraged stock exposure could strain dealer balance sheets and push short term interest rates higher.

The increase comes after a wave of major share offerings, including the record SpaceX listing, alongside rising equity valuations and rapid growth in leveraged exchange traded funds.

The July contract for futures tied to the S&P 500 total return index reached 200 basis points on June 26, up from an average of 62 basis points in May.

The widening spread reflects the growing imbalance between investor demand for leveraged long equity exposure and the capacity dealers have available to finance those positions.

That imbalance could have effects beyond the stock market. Bank dealers use the same balance sheets to intermediate activity across equities, government bonds and repo markets. As equity financing becomes more profitable or consumes more capacity, dealers may redirect resources away from fixed income.

Bank of America strategists Eleanor Xiao and Mark Cabana warned that continued pressure in equity funding could cause dealers to shift balance sheet capacity from fixed income into equities.

That could place upward pressure on repo rates, where banks and investors borrow cash against securities. Repo markets often experience temporary stress around quarter end as dealers reduce activity and Treasury settlements add collateral to the financial system.

Large inflows into money market funds have helped keep those pressures contained in recent weeks. However, the surge in equity financing demand could disrupt that relative calm.

Funding conditions may ease after the end of June as recent public offerings conclude and release cash back into markets. Still, futures with later quarterly expirations already reflect elevated financing costs, suggesting any improvement may be limited.

Morgan Stanley strategists said the jump in costs could lead prime brokers to become more conservative, reducing financing availability and charging hedge funds higher prices.

They warned that costs could remain elevated until the market experiences a significant reduction in leverage.

Bank of America reached a similar conclusion. Pressure may persist until demand for leveraged exposure weakens, dealer balance sheet capacity expands or US stocks decline.

The S&P 500 is heading toward its strongest quarter since 2020, supported by optimism around artificial intelligence investment. If that rally continues without a meaningful pullback, above average equity financing costs could become the new normal.