How A-Share Trader Mix Changes Momentum and Reversal Effects
Summary
This report examines whether price momentum signals behave differently according to which types of traders account for trading volume. It divides A-share participants into retail, medium, large, and institutional groups based on order size, then compares traditional return signals across stocks with different participation shares. The premise is that trading by different groups may carry different information.
The reported tests find stronger reversal when large and institutional trades make up more of activity, and a shift toward momentum as retail participation rises or institutional participation falls. The authors use the retail share to construct a revised momentum factor and report historical information coefficients and long-short and long-only portfolio results for the full A-share universe over 2010 to mid-2020. Those backtests show notably strong results relative to the traditional factor. The document provides summary findings rather than detailed construction and validation procedures; the reported performance is specific to its sample and period and does not establish that the factor will persist out of sample.
Key ideas
- Trading participant composition can alter the direction and strength of return-based signals.
- Higher large-trader and institutional participation is associated with stronger reversal effects.
- Higher retail participation is associated with a transition from reversal toward momentum.
- The report builds a revised factor using retail trading share and reports historical portfolio tests.
- The summary does not provide enough methodological detail to assess robustness beyond the stated sample.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.