Intermarket Trading System (ITS) Law and Legal Definition

Intermarket Trading System (ITS) is an electronic communications network now linking the trading floor of seven registered exchanges and FINRA to foster competition among them in stocks listed on either the NYSE or AMEX and one or more regional exchanges. Through ITS, any broker or market maker on the floor of any participating market can reach out to other participants for an execution whenever the nationwide quote shows a better price is available.