The DTC number is a number that is issued in connection with Depository Trust Company transactions. The number, known as an International Securities Identification Number, or ISIN, is required for companies that want to become listed with the DTC.
The DTC is responsible for holding more than 3 1/2 million securities worth trillions of dollars, including U.S. securities and securities in other countries. The DTC oversees activities that include deposit and withdrawal services, divided transactions, proxy and reorganization services, custody and safekeeping, underwriting, and direct registration of securities.
The DTC, which is based in New York, was established in 1973 and offers safekeeping via electronic bookkeeping of security balances. The DTC also serves as a type of clearinghouse in its role of processing trades in municipal and corporate securities.