Quantitative hedge funds are experiencing their most challenging period since 2023, as a sharp market rotation disrupts their strategies. This downturn signals underlying instability even within a broader bullish stock market, impacting how these data-driven investors operate.

The funds' performance is being hurt by significant shifts in market momentum, suggesting that the usual algorithms are struggling to adapt to the current environment. This trend has led to substantial losses, raising questions about the efficacy of traditional quantitative approaches in volatile conditions.

This period of underperformance could force major adjustments