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Tuesday, February 27, 2018

Options Technical Update #2018 - 7
UPDATED PHLX and NOM Update SQF and OTTO Specifications

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  • System Impact

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Nasdaq PHLX (PHLX) and The Nasdaq Options Market (NOM) have updated the PHLX and NOM Specialized Quote Feed (SQF) and the NOM Ouch to Trade Options (OTTO) specification documents.

Beginning Monday, March 12, 2018 on NOM, these changes provide a more specific removal reason in the event of an order or quote removal due to a disconnected session. The implementation of this change will be completed by Monday, March 19, 2018.

UPDATE: PHLX began implementing the below change on Monday, February 26. Changes to PHLX SQF have been rolled back and will recommence on Monday, March 19. The implementation of this change will be completed by Friday, March 23, 2018. These changes provide a more specific removal reason in the event of an order or quote removal due to a disconnected session.

PHLX/NOM Technical Specifications

The SQF 6.4O technical specification document has been updated to add an additional Purge Reason Code of Purge on Disconnect to the Underlying Purge Notification Message.

The OTTO 1.4d technical specification document has been updated to add an additional Cancel Reason of Cancel on Disconnect.

Please contact Market Operations with any questions.


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