Chinese Stock Screening with Price Between the Bollinger Midline and Upper Band

Summary

This stock screen combines a daily price move greater than one percent, a listing history longer than one year, and a closing price between the 20-day Bollinger midline and upper band. The document explains the move threshold as a way to find active stocks and the listing-age condition as a basic maturity filter. It also provides formula and Python examples for expressing the conditions, though the example code additionally sorts stocks by listing date and selects an early portion of that list.

The rationale is that Bollinger Bands describe recent volatility and price behavior, while selecting stocks near the upper band may capture strength. The article warns that popular or limit-up stocks may reflect speculation and that historical band readings do not predict future prices. It proposes adding indicators such as MACD or RSI and assessing technical and fundamental factors. No performance test or evidence of returns is presented, and the description contains some ambiguity in how the amplitude threshold is stated.

Key ideas

• The screen requires a daily price move above one percent and more than a year since listing.
• A stock qualifies when its close falls between the 20-day Bollinger midline and upper band.
• The article presents both formula-style and Python examples of the screen.
• The selection rules do not account for future performance and may favor speculative or popular stocks.
• The article suggests combining the screen with other technical or fundamental measures.

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