Faster Fundamental-Factor Rebalancing During Annual Report Season

Summary

This report examines whether updating fundamental signals more frequently can improve stock selection during China’s annual report season. It argues that factor signals decay over time, but more frequent rebalancing offers limited benefit for fundamental factors in most months. The potential advantage is concentrated in March and April, when annual results arrive and new financial information may reveal both negative signals and stocks with stronger post-announcement returns.

The report compares monthly, weekly, and daily rebalancing for four fundamental factors and broader factor portfolios. Its historical results show higher gross returns with more frequent rebalancing during the reporting season, with much smaller gains elsewhere. The benefit falls as assumed trading costs rise: at high costs, daily trading may no longer outperform less frequent schedules. These findings are based on historical portfolio comparisons and stated fee assumptions; they do not establish future returns or account for every investor’s capacity and execution conditions. The practical choice of frequency therefore depends on costs and capital capacity.

Key ideas

• Fundamental-factor gains from more frequent rebalancing are concentrated in March and April, when annual reports are released.
• The report links timely financial-data updates to capturing post-announcement returns and avoiding stocks with negative signals.
• Daily rebalancing improved historical long-short results over monthly rebalancing, with most of the improvement arising during annual report season.
• Higher trading costs reduce the benefit of more frequent trading and can make monthly or weekly schedules more attractive.
• Portfolio capacity and actual transaction costs should inform the choice of rebalancing frequency.

Tags

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.