Bank of America strategists are sounding the alarm about potential severe structural pressure and increased volatility in U.S. stocks, particularly in September. Their analysis indicates a significant imbalance, with only about $9 billion in remaining buying capacity from systematic trading strategies in bullish scenarios. Conversely, these same strategies, including commodity trading advisers (CTAs) and volatility-control funds, could be forced to offload up to $163 billion in equities if the market turns negative, representing an 18-to-1 sell-to-buy ratio. This imbalance is further exacerbated by volatility-control allocations reaching the 100th percentile, meaning there's maximum exposure susceptible to mechanical unwinding, and almost no systematic buying left to absorb it.
Adding to these concerns, corporate buybacks, a key support for U.S. equities, are entering their seasonal blackout period in September. Companies typically halt repurchase programs in the weeks leading up to earnings reports, removing a significant source of market support. BofA's Bull & Bear Indicator has been flashing a sell signal since May 2026, reaching a high of 9.7 in early August—a level not seen since 2021. This confluence of factors, including fully loaded systematic strategies, paused buybacks, and the extreme sell-to-buy ratio, suggests the market's shock absorbers are effectively gone on the downside.
Other institutions corroborate these warnings. Deutsche Bank data shows volatility control strategy equity allocations at the 100th historical percentile, indicating no room for further increases. Goldman Sachs estimates CTA net long exposure across global equity indexes at approximately $146.5 billion, near the upper end of its historical range. Nomura strategist Charlie McElligott also warns of an "epic" volatility collapse and potential major trading losses. The overall sentiment suggests that any market downturn could trigger a self-reinforcing negative feedback loop of "falling prices, rising volatility, further position reduction," with limited systemic buying power to counteract it.
