On Wednesday, November 22, 2023, MEMX Options released an update to its FIX Drop specification, version 1.6B can be downloaded here using the “upcoming version” link. Release date for Production is Friday November 24, 2023 and is already released to MODE. All previous versions of FIX Drop 1.6 will be deprecated. Members that would like to upgrade to version 1.6 FIX Drop in Production or MODE should reach out to Market Ops. Updates are listed below and in the specification Errata included in the download:
FIX Drop v1.6B
- In ExecutionReportTrade Message: Added new tag 167 Security Type
**If your Firm currently uses version 1.6 in Production you will receive tag 167 in your FIX Drops starting Friday 11/24/2023.**
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