Tag 50
SenderSubID
Abbreviation:
SSubDescription
Assigned value used to identify specific message originator (desk, trader, etc.)
Wire Format & Usage Example
Single field (key=value)
50=FIRM1
In a FIX message (Heartbeat)
8=FIX.4.4 | 9=... | 35=0 | 49=SENDER | 56=TARGET | 34=1 | 52=20240101-09:30:00.000 | … | 50=FIRM1 | … | 10=...
Fields are delimited by SOH (ASCII 0x01), shown here as " | ". The highlighted field 50=FIRM1 is this field's position in the message.