Current Position Information
Shares or contracts in current position at time of entry
For most positions FillQty will be the same as Shares.
The only time these quantities can differ is after a partial exit.
Partial exits can be specified using ExitQty, ExitLimitQty, and/or ExitStopQty.
Indeed the main purpose of FillQty is to facilitate expression of partial exit quantities in the above formulas.
For example to exit one fourth of the original position on each of the first four days after entry, simply write: