Screening Stocks by Turnover, Bid–Ask Queue Imbalance, and Large-Order Flow

Summary

This proposed stock screen selects shares with turnover inside a specified band, greater displayed volume at the best bid than at the best ask, and a high ranking by large-order net flow. The rationale is that moderate trading activity combined with apparent buy-side demand and institutional-sized inflows may identify active trading opportunities. The article also notes that such signals can depend heavily on short-term sentiment and are exposed to abrupt shifts in flows and market conditions.

The post includes formula and Python examples, but the implementations contain apparent inconsistencies between the stated rules and the fields or operations shown. For example, the code refers to data that are not clearly established by its data requests, so it is not a reliable ready-to-run specification. No performance study or evidence of predictive power is presented. The author suggests adding technical and fundamental measures and regular valuation review, but does not define those additions or test whether they improve results.

Key ideas

• The screen combines a turnover range with best-bid volume exceeding best-ask volume and a large-order net-flow ranking.
• The rationale treats order-book imbalance and capital flows as signs of short-term demand.
• The article identifies sentiment dependence and sudden flow reversals as key risks.
• The sample implementations contain mismatches and provide no backtest evidence.

Tags

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