NinjaTrader is a platform that supports multiple connectivity providers and therefore manages a single instrument instance (master instrument) and maintains the parameters required to establish market data and order permissions through the various connectivity sources. The Instrument Manager manages the instrument list (frequently traded instruments), edits instrument data and can add or remove instruments from the database. A default database of commonly traded instruments is installed with NinjaTrader.

The Instrument Manager can be accessed via the Control Center window Tools-->Instrument Manager menu.