A method of monitoring financial transactions includes periodically receiving a list of target account identifiers at a processing server and periodically transmitting the list to each of a plurality of platform servers. The platform servers are each configured to receive transaction information that includes transaction records of financial transactions. The transaction records include account identifiers used in the transactions. The platform servers are configured to search the transaction information for transaction records having a target account identifier from the list. The method also includes receiving at the processing server an alert that the platform server has identified a transaction record having a target account identifier. The alert including transaction data from the transaction record. The method further includes transmitting from the processing server a notification based on the alert that a target account identifier has been identified in a transaction record. Analogous systems are also provided.