China’s quantitative hedge funds endured significant losses last week as a global retreat from artificial intelligence and semiconductor stocks triggered a sharp reversal in crowded trades, exposing the risks associated with momentum-driven systematic strategies, according to a report by CryptoBriefing.
Among the hardest hit was Zhejiang High-Flyer Asset Management, one of China’s largest quantitative hedge fund managers with more than RMB70bn ($10bn) in assets under management. One of the firm’s funds declined 15.7% in the week to 17 July after being caught in the market downturn.
High-Flyer, led by Liang Wenfeng, had positioned the fund to outperform the CSI 1000 Index, which is heavily weighted towards smaller-cap Chinese companies. That exposure proved particularly vulnerable as investors rotated out of AI-related and technology stocks, sparking steep declines across the small-cap segment.
The selloff followed a broader global retreat from semiconductor and AI shares, with weakness spilling into China’s domestic equity markets. Quantitative funds with significant exposure to momentum factors and smaller-cap stocks were among the worst affected as previously popular trades unwound rapidly.
The latest losses echo previous periods of stress for China’s systematic investment industry between 2022 and early 2024, when momentum reversals and crowded positioning also produced sharp drawdowns. However, the impact is now more pronounced following substantial capital inflows into Chinese quantitative hedge funds during 2025, leaving many strategies with larger and more concentrated positions.
The episode also highlights ongoing concerns around factor crowding, a persistent challenge for systematic managers. As increasing amounts of capital pursue similar quantitative signals, trades can become vulnerable to abrupt reversals when market sentiment changes, forcing funds to exit positions simultaneously.
Liquidity has also emerged as a key issue. The CSI 1000 comprises smaller companies that generally trade less actively than the large-cap constituents of the CSI 300. During periods of market stress, that lower liquidity can accelerate price declines as systematic managers reduce exposure.
China’s quantitative hedge fund sector has grown into a significant source of trading activity in domestic equity markets and has attracted increased regulatory attention in recent years, particularly over high-frequency trading practices and the potential market impact of large-scale systematic strategies.
