Tag 561
RoundLot
Abbreviation:
RndLotDescription
The trading lot size of a security
Wire Format & Usage Example
Single field (key=value)
561=1000
In a FIX message (SecurityDefinition)
8=FIX.4.4 | 9=... | 35=d | 49=SENDER | 56=TARGET | 34=1 | 52=20240101-09:30:00.000 | … | 561=1000 | … | 10=...
Fields are delimited by SOH (ASCII 0x01), shown here as " | ". The highlighted field 561=1000 is this field's position in the message.