Paul, which did you go with - referencing the textboxes or the longer formula? As I said in post 21, textboxes were renamed in your last posted db. I showed revised expression which works for me.
@MajP, =[TransactionsBalance]/[SharesOwned] does work in the posted db because those controls are not in an aggregate function. The expression is simple arithmetic using the results of aggregate calcs and that is definitely possible.