Notice to Members 2017-30

Date: June 8, 2017
Re: Four Decimal Order Entry for Outright SSFs
Effective Date: July 10, 2017

OneChicago, LLC (“OneChicago”) is issuing this Notice to Members (“NTM”) 2017-30 to inform market participants that, pending regulatory review, OneChicago will be implementing four decimal pricing for outright SSF orders and trades.

Currently, blocks, EFPs, and spreads trade on OneChicago in four decimal places, while outright SSF transactions trade in only two decimals.  Pending regulatory review, OneChicago will begin accepting and matching outright SSF orders in its Central Limit Order Book in four decimals.  The resulting trades will also be priced out to four decimal places.  This change will become effective on July 10, 2017.  Market participants should make any necessary technology changes in advance of the scheduled transition date.  Four decimal order entry for outright SSFs is available in OneChicago’s user acceptance testing (“UAT”) environment.

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