Notice to Members NTM2017-22

Date: April 13, 2017
Re: Elimination of Pre-Open State in Delta1
Effective Date: April 17, 2017

OneChicago, LLC (“OneChicago”) is issuing this Notice to Members (“NTM”) 2017-22 to inform market participants that OneChicago is eliminating the Pre-Open state in its trading platform, Delta1.  Delta1 currently supports four primary states: Pre-Open, Open, Close, and Halt.  The Pre-Open state runs from 7:00:00 a.m. CT to 8:29:59 a.m. CT, during which time the reporting of bilateral trades in certain supported instruments, such as block trades and Exchange of Future for Physical (“EFP”) trades, is permitted.  During the Pre-Open state, order entry for SSF and Spread instruments is not permitted.


As of April 17, 2017, OneChicago will eliminate the Pre-Open state entirely.  Instead, bilateral reporting will be permitted for supported instruments in an Open state from 7:00:00 a.m. CT to 8:29:59 a.m. CT.  Unsupported instruments will remain in a Closed state until 8:30:00 a.m. CT.  The trading hours of these instruments are not changing as a result of the elimination of the Pre-Open state, and market participants will not experience any service interruption during this transition.

Description Open Time (CST) Close Time (CST)
SSF 08:30:00 15:00:00
BLOCK 07:00:00 16:00:00
EFP 07:00:00 16:00:00
SSF SPREAD 08:30:00 16:00:00


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If you have any questions, please contact OneChicago Operations at (312) 883-4311 or