Fractional Trade Message Fields

Fractional Trade messages are sent when an order is executed in whole or in part on a Cboe exchange. The last-sale eligible status (Flags field Bit 1) is derived based on four criteria:

1. The Session Indicator (see Cboe Market Status message) must be in the regular session.
2. The Last Quantity must be at least one round lot.
3. The Market Status (see Cboe Market Status message) for the executing exchange must be Normal.
4. The Transaction Time of the event must be within 10 seconds of the current time.

   Table 1. Fractional Trade

   Field	Offset	Length	Value/Type	Description
   Length	0	1	Binary	Length of this message including this field.
   Message Type	1	1	0xE8	Fractional Trade message
   Transaction Time	2	8	Binary	The time the trade occurred on the specified Market Center. Encoded as the number of nanoseconds since midnight (effective 11/02/26, since epoch).
   Symbol	10	8	Alphanumeric	Symbol right padded with spaces.
   Market Center	18	1	Alphanumeric	Market Center on which the last trade was executed: Y=BYX Z=BZX A=EDGA X=EDGX
   Market Center Execution ID	19	8	Binary	Market center specific execution identifier of this Execution. Execution ID is also referenced in the Trade Break message.
   Last Price	27	8	Binary 8.4 Price	Last trade price.
   Last Quantity	35	8	Binary	Last trade quantity.
   Cboe CumulativeExecuted Volume	43	8	Binary	Cumulative number of shares traded today across all applicable books.
   National Cumulative Volume	51	8	Binary 12.6	Cumulative number of shares traded today as reported to the CTA and UTP SIPs.
   Flags	59	1	Bit Field	Bit 0:National Volume Status 0:National volume data is complete. 1:National volume data may not be complete due to an unrecoverable gap on the incoming feed. Bit 1:Last-Sale Eligible 0:Trade is not last-sale eligible 1:Trade is last-sale eligible Bit 2-7:Reserved
   Total Length = 60 bytes