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Effective Rule Filings Rule Filings

SR-MEMX-2023-01: Change to Post-Market Session Hours

Date Filed: January 17, 2023 Description: Proposed rule change to extend the length of the Exchange’s after-hours trading session (i.e., the Post-Market Session) to end at 8:00 p.m. Eastern Time.

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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 Product Notices

Product Notice 23-10: Additional Exchange Products Approved for Trading

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Alerts and Notices Product Notices

Product Notice 23-08 to 23-09: Additional Exchange Products Approved for Trading

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Alerts and Notices Product Notices

Product Notice 23-05 to 23-07: Additional Exchange Products Approved for Trading

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Alerts and Notices Product Notices

Product Notice 23-04: Additional Exchange Products Approved for Trading

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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 Product Notices

Product Notice 23-03: Additional Exchange Products Approved for Trading

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Alerts and Notices Product Notices

Product Notice 23-01 to 23-02: Additional Exchange Products Approved for Trading