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Technical Notices

System Disruption Participant Notice System Disruption Participant Notice - updated 24-Mar-2015


During the period August 1 through October 13, 2011, CHX experienced a problem in handling its BBO ISO order type within the CHX Matching System which caused orders of this type to be cancelled upon receipt rather than executed. This problem impacted only orders specifically identified as the BBO ISO order type; orders specified as Price-Penetrating ISO or as ISO but without a specific CHX ISO type were not impacted. A fix for this problem was implemented across all Matching System instances for trading on October 14, 2011. We apologize for any inconvenience that this may have caused
CHX is experiencing problems dissemianting Bookfeed information for Nasdaq issues. All Trading systems are functioning normally.
In conjunction with other equity and equity options market centers, and in consultation with market regulators, the Chicago Stock Exchange will be closed for trading tomorrow October 30. Related questions should be directed to the CHX Help Desk at 312-663-2111
In conjunction with other equity and equity options market centers, and in consultation with market regulators, the Chicago Stock Exchange will be closed for trading tomorrow October 29. Related questions should be directed to the CHX Help Desk at 312-663-2111
At 11:45am CST, CHX Halted trading in all issues due to system problems. We will provide updates as soon as more information is available.
The CHX is experiencing a network issue that may cause intermittent message delays affecting all issues. We will advise once an update is available.
In conjunction with other market centers and in consultation with regulators, The Chicago Stock Exchange will open for normal trading in all sessions tomorrow, Wednesday, October 31. Questions can be directed to the CHX Help Desk at 312-663-2111.
At 12:46:30 CST, CHX resumed trading in OTC issues in the stock range K - V. All pending messages have been processed and queues are clear. All systems are operating normally.
At 14:25 CST, CHX resumed trading in NASDAQ Tape C securities.All systems operating normally.
At 07:40 CST, CHX Halted trading in all issues due to system problems.
All CHX system issues have cleared. All systems are operating normally.
As of 07:50 CST, CHX connectivity problems have been cleared. All systems are operating normally.Please call the CHX control room at 312-663-2606 if there are any questions.
Starting at 06:00 CST , CHX has been experiencing Matching Engine problems affecting stock range I-S in Tape B issues. Some orders will be rejected.
At 10:27:00 CST listed trades in the range of I - K were submitted to SIAC. All systems are operating normally.
At 08:46:00 CST, CHX Halted trading in listed issues only due to internal network issues. CHX connect issues are not affected.
At 09:03:15 CST, CHX resumed trading for listed issues. All systems operating normally.
At approximately 11:30 CST, the Chicago Stock Exchange experienced a problem with a network connection which caused momentary connection issues for some firms. All systems are operating normally at this time. Please contact CHX IT Operations at 312-663-2234 with any related questions.
At 07:25 CST, - CHX continues to experience network problems affecting some order sending firms ability to establish connections to CHX. CHX is working to resolve the issues and will issue and update as soon we have one. Please call the CHX control room at 312 663-2606 if you have any questions.
At 08:33 CST, CHX is experiencing problems disseminating outbound CQS/CTS quotes and trades.
At 10:55:23 CST, one of the data communication lines linking the Chicago and NY4 data centers failed. Customers may have experienced a momentary delay while traffic was automatically rerouted to other circuits. All systems are operating normally.
At approximately 4:17 CST, a series of dupe trades, which may include all trades done during the day, were sent out with a "SOLD" indicator. We are working on a solution to this problem and will advise as soon as possible. Questions can be addressed to 312-663-2606
At 06:30 CST, CHX is experiencing network problems affecting firms abilities to establish order sending connections. CHX is working to resolve the problems and will send an update when the problems are Resolved. As of now, we have no ETA on the Resolution. Please call the CHX control room at 312-663-2606 if there are any questions.
At 07:40am CST, all CHX firm connectivity issues have been Resolved. If you have any issue - please contact the Control Room at 312 663-2606 for assistance.All CHX systems are operating normally.
At 06:57am CST, the server affecting firms ability to connect and send orders has been recovered. We are in the process of opening FirmSwitch links for connectivity. We will advise shortly when the issue is completely Resolved.All other CHX applications are operating normally.
At 06:27am CST, CHX lost a server that affects firms ability to connect & send orders. We are in the process of recovery and will advise when the issue is Resolved. All other CHX applications are operating normally.
At 11:12 CST, CHX Halted trading in NASDAQ Tape C Securities due to communication issues at the NASDAQ SIP. All CHX Systems are functioning properly
At 09:05:31 CST, CHX Halted trading in LISTED issues in C-D range due to incoming market data problems. Those issues have Resolved and trading in the affected issues resumed at 9:07:37 CST.All systems are operating normally.
Starting at 15:00mm CST , CHX has been experiencing Matching Engine problems affecting listed issues alpha range (C-D)we will advise.
At 08:36 CST, CHX Matching System system problems were Resolved. All systems operating normally.
Starting at 08:30 CST , CHX has been experiencing Matching Engine problems affecting OTC issues C and D. ALl other OTC and Listed issues working properly. CHX Connect issues are not affected.
Starting at 09:54 CST , CHX has been experiencing Matching Engine problems affecting listed issue 'SPY' CHX connect is not affected.
Starting at 08:40 CST , CHX has been experiencing Matching Engine problems affecting NASDAQ issues A-D. All other systems operating normally.CHX Connect issues are not affected
All trades in NASDAQ issues beginning with letters A-D executed between 08:30 and 08:50 will stand. This decision cannot be appealed.
At 12:44:11 CST, CHX Matching System system problems with QQQQ,s has been Resolved. All systems operating normally.CHXConnect was not affected
At 07:24 CST, CHX Matching System system problems were Resolved. All systems operating normally.
CHX experienced Matching Engine problems accepting orders in the range H-I with tape B issues between 13:37 - 13:54 cst. All systems are operating normally at this time.
At 10:05 CST, CHX Matching System system problems were Resolved. All systems operating normally.
At 08:45 CST, CHX Matching System system problems were Resolved. All systems operating normally.
Due to system problems, it is possible that trades in NASDAQ issues starting with A-D that were executed between 08:30 and 08:50 may be reviewed. If you have questions regarding trades described, call the CHX help desk at 312-663-2111.
At 07:57 CST, - NASDAQ reported the issue with data dissemination on UQDF Channel 5 has been Resolved. All NASDAQ quote and trade channels are now functioning properly.Please note that all CHX systems are operating normally
At 06:01 CST, - NASDAQ is experiencing an issue with data dissemination on UQDF Channel 5, symbol range PC-SP, which AFFECTS the dissemination of CHX data in that range. All CHX systems are operating normally.
At 06:01 CST, - NASDAQ is experiencing an issue with data dissemination on UQDF Channel 5, symbol range PC-SP, which the dissemination of CHX data in that range. All CHX systems are operating normally.

Due to internal issues at our NY Datacenter firms may experience connectivity problems to the NY4 datacenter. If you have a connection to both

CH2 in Chicago and NY4 in New Jersey we suggest that you route all orders to the CH2 datacenter. 

We will advise.

Starting at 11:25a CST, CHX began experiencing problems with Order Management System affecting OTC orders in the alphabetic range S- Z.All other systems are operating normally.
Starting at 10:11:33am CST, CHX began experiencing problems with Order Management System affecting Listed issues S - Z. Those issues have been Resolved asof 10:21:44am. All systems are operating normally. Please call the Help Desk if you have any questions. 312 663-2111.CHX IT Operations
At 12:33 CST, CHX Halted trading in OTC issues in the stock range K - V. We will advise once an update is available.
CHX experienced problems quoting NASDAQ issues L - Z that was Resolved as of 8:37:30CST. All systems are operating normally.
The Chicago Stock Exchange is reviewing trades in the issue EWT that took place after 14.25.50 Chicago time. Please review to see if you have affected trades during the above time frame.
Starting at 07:16 CST , CHX has been experiencing Matching Engine problems affecting NASDAQ stocks only.All other systems are operating normally.
Between 09:37:02 and 09:37:12 CHX experienced a connection failure between its Chicago and East Coast data centers.During that time, firms may have experienced a delay in processing orders that would have traversed that connection. All applications are now operating normally.
At 08:15 CST, CHX will resume trading in all issues. All systems are operating normally.
During the time period of 11:03 Central time to 11:26 Central time, users may have experienced delays in processing orders in the following issues: CORN, DBA, DBC, DBO, DBS, DDM, DGAZ, DGL, DGP, DIA, DTO,DXD, SCO, SDS, SGOL, SH, SIVR, SLV, SMDD, SPXL, SPXS, SPXU, SSO, TBT, TLT, TMV, TNA, TZA. All CHX systems are operating normally.
At 13:04 CST, CHX Halted trading in listed issues A-D due to Matching engine problems.CHXConnect is not affected.
We are advising that all firms use their CH2 connection to route all orders. If firms do not have a CH2 connection we are advising that you route orders away from the Chicago Stock Exchange.
Effective 11:25:00 all issues are trading normally.
We are experiencing problems with Tape B issues trading in Chicago. Will advise
At 11:12 CST, CHX Halted trading in NASDAQ Tape C Securities due to communication issues at the NASDAQ SIP. All CHX Systems are functioning properly.
From 08:30:00 CST thru 09:26:49 CST, trades in listed issues in the range of I - K were not reported to SIAC. All systems are functioning normally at this time. Missing trades will sent to SIAC as soon as possible.Call the CHX control room (312-663-2606) if you have any questions.
Trades in the stock EWT were executed in error after a regulatory Halt at 14.25.50. Trades in the stock EWT Ishares MSCI Taiwan Fund executed after 14.25.50 Central Time will be busted. This decision cannot be appealed.
At 9:03:28am CST, CHX Halted trading in LISTED issues in the C - D range due to problems with the inbound quote feed in this range. Trading in these issues resumed at 9:07:34am CST. All CHX systems are operating normally.Please call CHX Help Desk 312 663-2111 if you have any questions.
At 07:45 CST, CHX resumed trading in all issues. All systems operating normally.
We are investigating a problem with outbound data being sent to the UTP SIP. We will advise.
From 10:38:00 to 10:44:15 CST, due to a system issue at the UTP SIP, the Chicago Stock Exchange outbound quotes, as well as quotes from other exchanges, were not being received by the SIP. NASDAQ SIP Resolved the issue at 10:44:15. All CHX systems are operating normally.
At 13:50 CST, CHX lost circuit connections with our Verizon POP. We will advise when circuits are stable.
Verizon has Resolved all circuit connection issues. All systems are operating normal.