- Score — score = RV x (1 + |change %| / 100), where RV = V_today divided by the 90-day average volume
- 90-day average — mean daily volume over the completed sessions inside the last 90 calendar days, on that same four-session definition. This is IBKR's own definition of the field (tick 21: “average daily trading volume over 90 days”); 90 calendar days held 61 sessions on 17 Aug 2026.
- |change %| — size of the move of last price against the previous completed session's close. The sign is displayed, but ranking uses magnitude only.
- Ranking floor — a symbol needs ≥ 20 completed sessions inside that window before it can be ranked at all. The displayed average and the ranking denominator are the same number.
- Average Volume column — shown whenever the window holds at least one completed session; an em dash only when there is no history in it at all, never an estimate.
- 🦙 Alpaca free Basic data is delayed. An hourly checkpoint therefore appears roughly 16–26 minutes after the hour it is labelled with. The measured “actual” delay in the header is the authoritative figure.
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