Automated Confirmation Transaction Service (ACT) An automated system designed to document and report the clearing of trades in the Nasdaq market. Investopedia Says: All NASD members are required to participate in ACT. ACT provides faster access to trade information, it increases the efficiency of trade reconciliation and back-office transactions, and it also offers online access to the status of all trade entries. Related Terms: Chill Clearing House Depository Trust Company - DTC Nasdaq National Association of Securities Dealers - NASD Qualified Special Representative Agreement - QSR |