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Alerts and Notices Trader Alerts

Trader Alert 23-04: MEMX Trading Hours Change

Effective Wednesday, February 1, 2023, the Post-Market Trading Session will be extended to 8PM ET rather than 5PM ET.

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Alerts and Notices Trader Alerts

Trader Alert 23-03: Updated MEMO Fix, MEMO SBE, and Fix Drop Specifications

On Tuesday, January 17, 2023, MEMX released new versions of its current MEMO FIX, MEMO SBE, and FIX Drop Specifications. Version 1.11 can be found here using the “upcoming version” link. The changes include the following which are outlined in the Errata. Added new Security Group (tag 1151) field to the ExecutionReport-Trade and Trade Cancel/Correct messages indicating the security’s […]

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Alerts and Notices Trader Alerts

Trader Alert 23-02: Holiday Reminder – Closed January 16, 2023

MEMX will be closed Monday, January 16, 2023, in observance of the Martin Luther King, Jr. holiday. Normal trading will resume on Tuesday, January 17, 2023. MEMX Market Hours and Holiday Schedule  Please contact Market Operations with any questions.   MEMX Market Operations | mops@memx.com | 1-833-415-6677  

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Alerts and Notices Trader Alerts Uncategorized

Trader Alert 23-01: Holiday Reminder – Closed January 2,2023

MEMX will be closed Monday, January 2, 2023, in observance of New Year’s Day.   MEMX Market Hours and Holiday Schedule  Please contact Market Operations with any questions.   MEMX Market Operations | mops@memx.com | 1-833-415-6677  

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Alerts and Notices Trader Alerts Uncategorized

Trader Alert 22-34: Holiday Reminder – Closed December 26, 2022

MEMX will be closed Monday, December 26, 2022, in observance of Christmas Day.   MEMX Market Hours and Holiday Schedule  Please contact Market Operations with any questions.   MEMX Market Operations | mops@memx.com | 1-833-415-6677  

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Alerts and Notices Trader Alerts

Trader Alert 22-33: Fee Schedule Update Effective December 1, 2022

Effective Thursday, December 1, 2022, MEMX will be implementing the following changes to transaction fees, subject to filing with the SEC: Convert the NBBO Setter Tier to the NBBO Setter/Joiner Tier 1, which now provides an increased additive rebate for executions of setter/joiner volume (other than Retail Orders) in securities ≥$1. Adopt a new NBBO […]

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Alerts and Notices Trader Alerts

Trader Alert 22-32: Updated MEMO Fix, MEMO SBE, and Fix Drop Specifications

On Tuesday Nov 22, 2022, MEMX released new versions of its current MEMO FIX, MEMO SBE, and FIX Drop Specifications. Version 1.8 Rev-C, 1.9 Rev-C, 1.9 Rev-D, and 1.10 Rev-C and 1.10 Rev-D can be found here using the “upcoming version” link. The changes include the following which are outlined in the Errata and leverage existing fields […]

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Alerts and Notices Trader Alerts Uncategorized

Trader Alert 22-31: MWCB Testing Opportunity – December 3, 2022

The Securities Information Processors (“SIPs”) will conduct data center failover testing as well as Market-Wide Circuit Breaker (“MWCB”) breach Level 1 and 2 on Saturday, December 3, 2022. In coordination with other market participants, MEMX will participate in the test and published a test script: MEMX 2022 Market-Wide Circuit Breaker Test Script. Certain members designated […]

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Alerts and Notices Trader Alerts

Trader Alert 22-30: Holiday Reminder – Thanksgiving Holiday Schedule

MEMX will be closed Thursday, November 24, 2022, in observance of Thanksgiving. MEMX will follow an abbreviated trading schedule on Friday, November 25, 2022, in which the regular market session will conclude at 1:00 p.m. ET and the post-market session will conclude at 2:00 p.m. ET. Thursday, November 24, 2021 – Closed Friday, November 25, […]

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Alerts and Notices Trader Alerts

Trader Alert 22-29: Fee Schedule Update Effective November 1, 2022

Effective Tuesday, November 1, 2022, MEMX will be implementing the following changes to transaction fees, subject to filing with the SEC: Adopt a new Liquidity Provision Tier 4 (and renumber the existing Liquidity Provision Tier 4 as Liquidity Provision Tier 5). Change the required criteria under Liquidity Provision Tier 2. Change the fee and the […]