Relative volume: activity is not direction
The exact FINVERCO denominator, a worked example and the intraday comparison trap.
What the current number compares
FINVERCO divides the latest daily-bar volume by the average volume of the last 20 available bars, including that latest bar. At least 20 bars are required. This is a daily-bar activity ratio, not a comparison against the historical volume at the same minute of the session.
Suppose the previous 19 bars each contain one million shares and the latest contains three million. The implemented average is (19 + 3) / 20 = 1.1 million, so relative volume is about 2.73. A denominator that excludes the latest bar would produce 3.0. Both conventions exist; check which convention you are comparing.
High activity does not reveal who is right
A ratio above one means the latest bar contains more activity than this reference average. It does not identify net buying, institutional conviction, informed trading or the direction of the next move. Every completed trade has both a buyer and a seller.
Read activity alongside price response. A large volume increase with little price progress raises a different question from a breakout that holds above its previous range. This is a prompt to examine the chart and event context, not an automatic buy signal.
The partial-session trap
If a provider supplies an incomplete daily bar during the session, comparing its volume with completed daily bars can understate activity. The FINVERCO formula does not correct for elapsed trading time or the typical intraday volume curve. Verify the bar timestamp and whether the session has finished.
An event day can also raise the reference average for subsequent observations. A lower ratio tomorrow need not mean fewer shares traded than on a quiet historical day. Check the underlying volumes before explaining a change in the ratio.
A repeatable reading routine
Record the latest volume, reference window and session status together. Then ask whether the event explains the activity and whether price behavior confirms or contradicts your hypothesis.
- Use the same denominator convention across comparisons.
- Separate complete sessions from partial sessions.
- Check earnings and corporate-action context.
- Treat high relative volume as attention, not evidence of a guaranteed outcome.
Sources and evidence
The editorial policy explains AI assistance and the limits of these studies.
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