Screening Volatile Stocks After a Limit-Down Opening Match

Summary

This proposed stock screen combines three conditions: intraday amplitude above a threshold, at least one large positive daily return within the recent trading window, and a prior-day 9:15 matching price at the limit-down level. The article presents the conditions as a way to combine volatility, recent price strength, and a sign of opening downside pressure. It includes formula and Python-style examples, then suggests adding company fundamentals, valuation, and liquidity measures to refine the candidate list.

No backtest, performance statistics, or evidence is provided to show that this combination forecasts returns. The article notes that a limit-down matching price does not guarantee continued weakness and that short-term price behavior may miss important fundamental information. Its examples also leave the proposed fundamental and liquidity filters as placeholders, and the code’s simplified conditions may not fully represent the stated lookback and matching-price rules. The screen should therefore be treated as an outline requiring precise definitions and empirical evaluation.

Key ideas

• The screen combines high price amplitude, a recent large daily gain, and a prior-day limit-down matching price.
• The article proposes adding valuation, fundamental, and liquidity filters.
• A limit-down match does not by itself establish that a stock will continue falling.
• The examples leave some filters undefined and provide no evidence of predictive performance.

Tags

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