Fractional share quantities can be entered out to 3 decimal places (.001) as long as the value of the order is at least $1.00. Executions will be rounded down to the nearest .001 shares.
Dollar-based trades can be entered out to 2 decimal places (e.g., $250.00). Your order will be converted into shares out to 3 decimal places (.001) and are rounded down to the nearest decimal.