A position is a binding commitment to buy or sell a given amount of financial instruments, such as securities, currencies or commodities, for a given price.
Not sure if there is something called holding too.
1. A general reference to an investment holding. A position can be long or short, and it can be in any asset class, such as stocks, bonds, futures, or options. A position can be open (current) or closed (past), but in general use, unless a position is specifically referred to as closed, the assumption is that it references an open position.
‘Holding’ shows your previous open positions i.e. positions apart from today. ‘Positions’ show your today’s positions along with MTM, which I pray is always in the green for everyone