On July 26, 2021, MEMX has released new versions of its MEMO FIX and MEMO SBE specifications. The new 1.6 versions can be downloaded here. Please note, this update is not a trading platform update/change, but rather a specification update to include details on Pending New Execution report messages and Order Reject Reason Codes as listed below:

MEMO FIX Version 1.6

• Added text indicating that the Pending New execution report message is sent by default and may be disabled upon request.

• Added the following Order Reject Reason codes:

1. MissingSTPGroupId (value=177)

2. InvalidSTPGroupId (value=178)

MEMO SBE Version 1.6

• Added text indicating the Pending New execution report message is sent by default and may be disabled upon request.

• Added the following OrderRejectReasonCodes:

1. MissingCancelGroupId (value=86)

2. InvalidCancelGroupId (value=87)

3. MissingSTPGroupId (value=88)

4. InvalidSTPGroupId (value=89)

• Added the following MassCancelRejectReasonCode:

1. InvalidCancelGroupId (value=8)

Our Market Operations and Member Experience teams are here for any of your questions.

MEMX Market Operations

mops@memx.com

1-833-415-6677

MEMX Member Experience

memberx@memx.com

1-833-415-6369