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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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Systems Alerts Uncategorized

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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Systems Alerts

Systems Alert 21-01: Start of Pre-Market Session Delayed – RESOLVED

02/08/2021 07:17 ET – MEMX experienced an issue with its Pre-Market start-up process. The issue has been fully resolved. The Pre- Market session opened at 07:14 ET. All MEMX systems are operating normally. 02/08/2021 06:50 ET – MEMX is currently investigating a potential issue and will not open the pre-market session until further notice.

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Systems Alerts

Systems Alert 20-04: 10/12/2020 Issue Summary 

On October 12, 2020, the Exchange experienced an issue with a subset of internal monitors. The trading platform was not impacted. The issue manifested itself in the inability to fully view the trading data in a subset of the operational monitoring dashboards. Out of an abundance of caution for the greater marketplace, MEMX chose to halt pre-market trading at 09:15 […]

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Systems Alerts

Systems Alert 20-03: MEMX to Halt and Delay Open – RESOLVED

10/12/2020 11:33 ET – MEMX has resumed trading. 10/12/2020 11:15 ET – MEMX has resolved an issue propagating trading data into the Exchange’s monitoring complex. The issue did not impact the trading platform. MEMX will resume trading at 11:30 ET. All MEMX Systems are functioning normally. 10/12/2020 09:25 ET – MEMX will delay the market […]

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Systems Alerts

Systems Alert 20-02: MEMIOR Top, Depth, and Last Sale Issue – RESOLVED

10/09/2020 09:10 ET – MEMX has normalized the “a” and “b” feeds as of 09:10 ET. Customers should use their normal mechanisms (i.e. replay from sequence 1 or snapshot) to recover the feed state. All systems are now operating normally. 10/09/2020 09:03 ET – MEMX has determined that there was a messaging count inconsistency between […]

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Systems Alerts

Systems Alert 20-01: Start of Pre-Market Delayed – RESOLVED

9/23/20 08:15 ET – MEMX experienced an issue with market data ingestion in the Pre-Market. The issue has been fully resolved. The Pre-Market session opened at 08:15 ET. All MEMX systems are operating normally. 9/23/20 07:00 ET – MEMX is currently investigating a potential issue and will not open the pre-market session until further notice.