If the volume data in charts differs from the volume data in ticker rows or quote details, it may be because:
- TWS charts only display the calculated volume
- In TWS ticker rows and Quote Details you can choose to show either the Native or Calculated volume. Do this in the TWS Global Configuration under Display followed by Ticker Row.
Native volume does not update with every tick, but will include delayed transactions, busts, late-reported trades, and combos. Calculated volume does not include these.
You can add a Quote Panel to your chart so you can see the volume of the current market session according to the preference you set in the Global Configuration. Click the View menu option within the chart and select Quote Panel.
Please Note: There may be differences in the volume reported by IBKR or by other market data providers because of the specific inclusions/exclusions each provider sets (primarily concerning block trades, combos and odd-lots).
Find out more about volume display settings and TWS chart menus in the TWS Users' Guide.