HomeDefinitionsCompareDebt Intermarket Surveillance Information System (ISIS)The financial definition for Intermarket Surveillance Information System (ISIS):A database that distributes information from all the major stock exchanges in the United States. Similar MatchesSurveillance department of exchangesSurveillance department of exchangesA department that monitors trading activity on an exchange in order to identify any unusual activity that may indicate illegal practices. Click to compare definitions of Intermarket Surveillance Information System (ISIS) Click to view definitions beginning in |