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Alerts and Notices Trader Alerts Uncategorized

Trader Alert 21-28: Reminder – MEMX Regulation SCI Disaster Recovery Testing

On February 1, 2021, MEMX published Regulatory Notice 21-2: Mandatory Participation in Regulation SCI Disaster Recovery Testing. In coordination with other market centers as part of the SIFMA organized industry test, and in support of Regulation System Compliance and Integrity requirements, MEMX will host a test of its secondary/disaster recovery facilities on Saturday, October 23, 2021.  The scope for […]

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Alerts and Notices Trader Alerts Uncategorized

Trader Alert 21-15: Holiday Reminder – Closed May 31, 2021

MEMX will be closed Monday, May 31, 2021 in observance of Memorial Day. Normal trading will resume on Tuesday, June 1, 2021.  

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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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US Equities
Instrument Directory

Click Here for the Instrument Directory Download What is the mapping in the file? The securityId field is the positive integer value used in the MEMOIR feeds when market data updates are reported for the product. The symbol field is a string that contains the CMS Symbol Root for the product. The symbolSfx field is […]

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Membership, Connectivity, and Market Data Documents

Agreements, forms, and policies related to membership with, connecting to, and receiving market data from MEMX are provided below for reference and review. Participants interested in becoming a member of, connecting to, and/or receiving market data from MEMX should follow the on-boarding process available at: https://memxtrading.com/onboarding. Membership Connectivity Market Data

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US Equities
User Manual

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US Equities
Test Facility Details

MEMO Test Session Details You will need to provide the Market Operations team a preference of SBE or FIX encoding for your ports. The Market Operations team will provide synthetic account, MPID, and login details for these sessions. If upon order entry no MPID is specified, the default MPID will apply to the order.  However, […]