Chinese Earnings Surprise and Post-Announcement Gap Stock Strategy

Summary

This Chinese-language report summary describes an A-share stock selection approach combining an earnings surprise proxy with the price gap after an earnings announcement. Instead of comparing reported profit directly with analyst expectations, it identifies research report titles containing language associated with results exceeding expectations. It then measures the announcement-day response through JOR, the stock’s next-day opening gap relative to the market index.

The proposed portfolio selects the 50 qualifying stocks with the largest JOR values, weights them equally, and rebalances periodically. The summary reports factor statistics and historical relative returns against the CSI 500, but it does not provide the full report’s methodology, sample construction details, trading costs, or robustness tests. It also notes exposure to growth-oriented sectors and warns that systematic market conditions or changes in factor effectiveness could undermine results. The evidence should be treated as a summary of reported backtest findings, not as proof of future performance.

Key ideas

• The strategy identifies earnings surprises through sentiment-like wording in analyst report titles.
• JOR measures the announcement-related price gap relative to the market index.
• The portfolio equally weights the qualifying stocks with the largest JOR readings and rebalances periodically.
• The reported historical results lack supporting details on costs and robustness in this summary.

Tags

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