Volume

SGX's public board labels Vol (000s) as the number of securities traded today, in thousands. That is a share count, scaled for the table. It is not the number of board lots.

The SGX securities feed carries two volume fields. v is traded shares so far this session. vl is board-lot contracts. We store v on the stock row as Volume (session). If v is missing we fall back to lots times board lot, default 100. We did this after the banks once read about a thousand times too low when the lot field was treated as shares.

Avg Daily Volume is the 20-session mean of historic daily share counts from the charts feed. Quotes never overwrite it.

A session print far above the 20-day average means more stock changed hands than usual. It does not tell you who bought or sold, or whether the next print is up. A quiet counter can print a last price on a handful of shares. That last is still the last. It is just a thin one.