For US-DTC settlement instructions, ID 3 (Inst/Broker ID) is required and validated against DTC master files. ... The DTC uses this to send trade confirmations.
The label for A/C# @ Depository (ID 1) is DTC#, ID 2 is Agent ID, and ID 3 is Inst/ Broker ID. Each must be exactly 8 characters. DTC numbers must exist in ...