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CBSX to Disable All-Or-None Orders

June 28, 2012
[ by Howard Haykin ] CBSX will rollout a system modification to prevent acceptance of orders with an All-Or-None (AON) contingency.   The rollout begins in July 2012.  The software modification will be rolled out to each cluster of trading servers (BC) individually and is expected to complete over 5 business days, absent any unanticipated issues that would cause the rollout to be interrupted.  As the software modification is installed on each BC, new orders with the AON contingency will be rejected back to the submitting market participant. The Exchange will announce the specific roll-out schedule once it's been ascertained.  Contact the CBSX Helpdesk with questions.  A specific contact is: Jonathan Lewan, 866.458.2279, cbsxhelpdesk@cboe.com. For further details, go to:   [CBOE RegCircular 12-84, 6/28/12].