Screening A-Shares for Price Limit Opens and Moderate Turnover

Summary

This Chinese A-share screening example combines three conditions: price amplitude above 1%, a prior-day 9:15 matching price at the daily limit-down level, and turnover between 3% and 12%. The document presents the combination as a way to filter for unusual price behavior while constraining market participation and liquidity. It includes illustrative formulas for a charting platform and Python, though the latter references platform-specific functions that are not defined in the example.

The article offers a qualitative rationale, not performance evidence: it includes no backtest, returns, sample definition, or comparison with a benchmark. It cautions that price-only signals may overlook company fundamentals and that fixed turnover limits may not suit every market environment. It proposes adding valuation measures and adjusting thresholds as conditions change. The rule should therefore be read as a candidate screen requiring validation, with ambiguity around the exact matching-price condition and the implementation details limiting reproducibility.

Key ideas

• The screen combines price amplitude, a prior-day 9:15 limit-down matching price, and a turnover band.
• The turnover filter is intended to constrain the stocks by trading activity and liquidity.
• The document supplies example formulas, but some referenced functions are not defined.
• It provides no backtest or other evidence that the screen is profitable.
• It recommends adding fundamental measures and adapting thresholds to market conditions.

Tags

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