Filtering A-Shares by Volatility, Float Size, and Auction-Time Buying
Summary
The document describes a Chinese A-share stock screen combining price amplitude above 1%, a circulating share count no greater than 5.5 billion, and auction-period price movement accompanied by large and extra-large buy-flow volume above the stated threshold. The intended rationale is to focus on volatile stocks with relatively limited share floats and signs of concentrated buying interest. Example formula and Python sketches outline how to calculate filters and rank candidates, but the document does not provide a backtest or measured results.
It warns that auction-time price changes and large-order flow may give an incomplete picture and can misidentify popular stocks. The flow threshold may also exclude potential candidates, while a high buying signal alone does not establish reasonable valuation or business quality. The proposed improvement is to combine the screen with other price-volume measures and company valuation, earnings, and share-structure analysis. The selection rules should therefore be treated as an initial filter whose effectiveness remains unverified in the document.
Key ideas
- The screen combines price amplitude, a maximum circulating share count, and auction-time buying activity.
- The stated rationale is to find volatile, moderately sized stocks attracting large-order interest.
- Auction-period price movement and reported order flow may not represent the stock's full trading picture.
- A buying-volume threshold can exclude candidates, and buying interest does not establish fair value.
- The author recommends combining the screen with further price-volume, valuation, earnings, and ownership analysis.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.