What values can I set for "Last Size Extra Decimal"?

To return to integer display, navigate to the Stock Preset settings inTrader Workstation, IBKR Desktop, or IBKR Mobile, and turn off the "Last Size Extra Decimal" setting. Once disabled, Last Size values will again be displayed as integers across all platforms…

The "Last Size Extra Decimal" feature controls how Last Size values are displayed across platforms. By default, Last Size values are displayed as integers. When configured, the feature formats Last Size values to a specified number of decimal places, giving users greater precision in how trade size data appears in the interface. This feature is effective starting February 23, 2026…

By default, "Last Size Extra Decimal" is off. In this state, all Last Size values are displayed as integers, with no decimal places…

Client Portal includes a dedicated “ON/OFF toggle for "Last Size Extra Decimal" display behavior. It can be accessed from clicking the User icon from top-right corner:

• OFF (default): Client Portal reads the "Last Size Extra Decimal" setting configured in Trader Workstation, IBKR Desktop, or IBKR Mobile and formats the Last Size values accordingly. The tooltip on hover will show the unformatted raw Last Size…