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Alerts and Notices Regulatory Notices

Regulatory Notice 21-04: CAT Clock Synchronization Certification Reminder – Due March 15th

Date: March 5, 2021 Description: CAT Clock Synchronization Certification Reminder – Due March 15th

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Alerts and Notices Systems Alerts

Systems Alert 21-08: RESOLVED – Trade Reporting Issue

3/4/2021 18:35 ET – Please be advised that due to a software error the Exchange did not report trades to the CTA or UTP SIPs on 3/4/2021 from 15:09 ET to 17:00 ET. The error was corrected, and trade reporting was successfully completed for this symbol range at 18:32 ET. 3/4/2021 15:25 ET – SIP […]

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Alerts and Notices Systems Alerts

Systems Alert 21-07: N-T Trades Reported Late to CTS

03/01/2021 19:05 ET – Please be advised that due to a partial disruption in the Exchange Trade Reporting Service, CTS (Tape A and B) prints on MEMX were delayed for symbols N-T on March 1, 2021. Trade reporting was successfully completed late for this symbol range.

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605 Reports

January 2021

MEMX has updated the computation method for average realized spread and average effective spread as of January 2022, after this report was published.

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Alerts and Notices Systems Alerts

Systems Alert 21-06: 2/23/21 Issues Summary

At 15:55 ET the Exchange experienced a matching engine failure impacting symbol range U through Z. The software failure causing the outage has been identified and resolved. The Exchange will resume normal operations on 2/24/2021. Earlier in the day, the Exchange experienced an issue with its ticker plant. After several unsuccessful attempts to failover to […]

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Alerts and Notices Systems Alerts

Systems Alert 21-05: RESOLVED – Investigating Issue in Symbols U-Z

2/23/2021 19:27 ET – At 15:55 ET the Exchange experienced a matching engine failure impacting symbol range U-Z. The software failure causing the outage has been identified and resolved. The Exchange will resume normal operations on 2/24/2021. 2/23/2021 15:58 ET – The Exchange is currently experiencing an issue with the matching engine supporting symbols U-Z.

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Alerts and Notices Systems Alerts

Systems Alert 21-04: Market Data Source for A-L Moved to Secondary

2/23/2021 12:40 ET – Due to impact from the market data ingestion issue experienced earlier today the Exchange has moved to its secondary market data source for the remainder of the symbol ranges, A-L. The change occurred from 12:37 ET – 12:38 ET.

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Systems Alerts Uncategorized

Systems Alert 21-03: RESOLVED – Market Data Ingestion Issue

2/23/2021 12:07 ET – The Exchange will resume trading in symbols M-Z at 12:10 ET, using secondary source market data for this symbol range. The market data ingestion issue has been resolved. All Exchange systems are now operating normally. 2/23/2021 10:32 ET – The Exchange has halted trading in symbol range M-Z as of 10:32 […]

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Alerts and Notices Systems Alerts

Systems Alert 21-02: 2/8/21 Issue Summary

On February 8, 2021, the Exchange experienced an issue with its Ticker Plant during pre-market start-up procedures. The Exchange delayed the open of the pre-market session until 07:14 ET. At 07:14 ET the Exchange opened utilizing back-up Ticker Plant processes. The Exchange moved back to primary Ticker Plant processes at 08:52 ET prior to the […]

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Alerts and Notices Trader Alerts

Trader Alert 21-06: Holiday Reminder – Closed February 15, 2021

MEMX will be closed Monday, February 15, 2021, in observance of the Presidents’ Day holiday. Normal trading will resume on Tuesday, February 16, 2021.