Release Notes

FIX UAT Release Notes


DateTypeComponentRelease Note

02/26/2026

Improvements

FIX Services

Introduced support to facilitate unique instrument identification in scenarios where options share identical strike prices, types, and maturities, but differ by exercise style:

1. Tag 1194 (ExerciseStyle): Available for primary instrument identification.
2. Tag 1420 (LegExerciseStyle): Available for individual leg identification within multileg instruments.

(Ref 194184)

Version: v305

02/25/2026

Improvements

FIX Services

Introduced a new value to tag 378 (ExecRestatementReason) in the Execution Reports (35=8).
1. 9003 - Exec Restatement Reason Revived

This reason will be populated in a restated Execution Report whenever a fill is unassigned from a terminal care order.

(Ref 201458)

Version: v305

02/25/2026

Plan

FIX Services

UAT deployment of the v305 Market Data, Recovery and Inbound Drop Copy FIX Services began Feb 24th.

UAT deployment dates for the v305 FIX Order Routing and Drop Copy will be shared in the coming days.

Production deployment of these services will begin in 4-5 weeks.

This release includes changes to the FIX XML schema files. Clients are strongly encouraged to download and deploy the latest XML schema files from the URL below prior to release: [https://library.tradingtechnologies.com/tt-fix/general/System_Overview.html]

Release Notes for FIX v305 and prior releases can be reviewed at any time by going to [https://library.tradingtechnologies.com/release_notes/]

All TT FIX clients are strongly encouraged to subscribe to the weekly TT System Admin News and Updates email newsletter here: [https://www.tradingtechnologies.com/support-updates/]

(Ref 194377)

Version: v305

Learn More

02/25/2026

Improvements

FIX Services

Introduced a new value for tag 16114 (LinkType).
1. F - Parent Account ID

When an order's account has a parent account, the Execution Reports (35=8) for that order in the FIX Drop Copy compliance session will include the parent account name in tag 16113 (LinkID), with tag 16114 set to 'F' within a LinkGroup.

(Ref 194374)

Version: v305

02/25/2026

Improvements

FIX Services

Introduced tag 54 (side) on the OrderCancelRequest (35=F) messages generated in TT FIX Drop Copy session with compliance feed.

(Ref 194372)

Version: v305

02/25/2026

Improvements

FIX Services

Introduced 3 new values for tag 8000 (SMPInstruction) to represent market wide SMP actions which is applicable for Eurex only.
1. f - SMP Instruction Type Market Wide Cancel Aggressor
2. g - SMP Instruction Type Market Wide Cancel Resting
3. h - SMP Instruction Type Market Wide Decrement Leaves Qty

Users can test the values along with the upcoming Eurex/EEX/Nodal upgrades. Refer weekly TT System Admin News and Updates email newsletter here: [https://www.tradingtechnologies.com/support-updates/]

(Ref 194370)

Version: v305