Summary: Bank of America analysts say last Friday's Nasdaq-100 drop likely triggered the start of a coordinated unwind among systematic long equity strategies. The firm estimates that further losses in the high single-digit to low double-digit range would widen the liquidation wave, while related signals in S&P 500 and small-cap markets show additional stop-loss bandwidth before more widespread selling occurs.
Analyst Chintan Kotecha told clients that the Nasdaq-100's 4.8% slide on Friday constituted its largest volatility-adjusted drawdown since October 2025 and ranks as the 13th worst sigma decline since 1985. BofA's modelling of commodity trading advisor stop-loss thresholds for the NDX, measured ahead of trading on the session, put potential triggers roughly 4.3% to 6.8% below previous levels, implying the most risk-averse CTA strategies likely began cutting exposure during the selloff.
Despite that initial reaction, the bank cautioned that the process may not be complete. Kotecha wrote that at least half of the CTA long book probably remains in place, and that an incremental downside of about 90 basis points to 2% could be sufficient to set off a broader unwind across systematic models.
Across other equity benchmarks, estimated stop-loss bands vary. BofA places S&P 500 stop-loss levels approximately 40 basis points to 2.6% lower, while Russell 2000 triggers are modelled around 2% to 5% below recent prices. Those ranges indicate that small caps and the broader S&P 500 may yet have room to move before facing the same degree of model-driven selling attributed to CTAs.
The firm also flagged record selling from leveraged and inverse exchange-traded products. BofA's data show these vehicles shed more than $12 billion of Nasdaq-100 exposure on Friday, which the bank described as the largest one-day outflow on record for such products.
Options market structure has played a role in recent realized volatility patterns. SPX gamma exposure averaged about $6.4 billion per day through May and into June, and BofA estimated that this elevated gamma profile reduced realized volatility by roughly 1.3 volatility points over the prior month. Friday's price action, however, exposed the limits of that dampening effect as stretched upside momentum in AI-focused leaders reached exhaustion and flipped into a fragility event, according to Kotecha.
On the fixed income side, CTA positioning remains skewed short in U.S. Treasuries. The bank noted that stronger-than-expected payrolls data on Friday reinforced those short Treasury stances among systematic strategies.
Contextual note: The observations above are drawn from BofA's client research and reflect the bank's estimated model triggers, recorded ETF flows and options market metrics. The analysis highlights vulnerability in systematic equity positioning and the potential for additional model-driven selling should markets move further downside from Friday's levels.