Screening 2021 IPO Stocks with Turnover and Bollinger Bands

Summary

This stock-selection example filters Chinese equities by turnover, listing year, and Bollinger Band position. It targets stocks with turnover between 3% and 12%, an IPO year of 2021, and a closing price above the Bollinger middle band but below the upper band. The code reference calculates the bands from a 20-period moving average and two standard deviations, then checks the latest available observation in the selected historical data.

The article frames the screen as a mix of trading activity, listing history, and a price-position indicator. It offers no reported returns, candidate list, or backtest results, so it does not show that the conditions predict performance. Its own caveats include the dependence of Bollinger signals on historical data and market conditions, sensitivity to market cycles, and the risk of relying on a narrow screen. It recommends testing across multiple periods and adding other technical and fundamental measures, but gives no evidence that these changes improve results.

Key ideas

• The screen selects stocks listed in 2021 with turnover from 3% to 12%.
• It requires the closing price to lie between the Bollinger middle and upper bands.
• The code example calculates Bollinger Bands using a 20-period average and two standard deviations.
• The document supplies no backtest results or evidence of predictive performance.
• Historical indicator limits and market-cycle effects may make the screen unstable.

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