Volume that actually means something

Commodities gave you open interest to pair with volume. Equities does not have it - so the reading discipline leans entirely on making volume itself honest, and the lever is normalisation.

Raw volume is noise twice over

Across names, share counts are incomparable - a million shares is a quiet hour in one name and a month in another. And within a name, module 1's mechanical flows set a baseline that means nothing: the indexers, rebalancers and buyback programmes churn shares daily with no view. Raw volume is mostly this machinery running at its usual pace, plus the closing auction's obligated crescendo.

The honest version

• Relative: today against the name's own average - 8 million shares on a 2 million average is 4 times normal, and that ratio, not the count, is the signal that something differs.
• Time-adjusted: volume accumulates on a known daily curve, so noon's total is compared to noon's normal - not to full days.
• Auction-separated: the close's volume is benchmark machinery and belongs out of the intraday reading; a name doing four times normal by lunch is news, four times normal in the closing cross is Tuesday.

What elevated volume can and cannot say

High relative volume says attention has arrived: something - news, a flow event, an index change - has pulled the name out of its routine. It does not say which, and it does not say direction: module 1's decomposition still applies, and a volume surge on an index reconstitution day is flow, not opinion. The reading habit: relative volume flags the names worth a question; the answer comes from the news tape and the sector context, never from the bar itself.