FIX Protocol Extension Packs
The FIX Protocol is updated and extended constantly. Rather than releasing new FIX versions from time to time, the Protocol evolves through Extension Packs, each produced by the Global Technical Committee based on requirements from FIX’s working groups and members, and published immediately. The term “FIX Latest” stands for the most recent version of the Protocol up to and including the latest Extension Pack.
This work is licensed under a Creative Commons Attribution-NoDerivatives 4.0 International License.
EP300 - EU Consolidated Tape for Bonds and Equities 5.01 MB 1288 downloads November 6, 2025
This extension pack includes enhancements needed to support the EU’s consolidated tape (CT) for bonds and equities defined by ESMA as part of the MiFIR Review Final Report - Technical Standards related...
EP299 - MDEntryType(269) extension 4.25 MB 339 downloads June 24, 2025
This extension pack supports the requirement to publish adjusted reference settlement prices due to corporate actions. It adds a new code value for the MDEntryType(269) = f (Corporate action reference...
EP298 - Allocation Enhancements 4.45 MB 433 downloads April 29, 2025
This extension pack enhances the capability to assign individual allocations of an AllocationInstruction(35=J) message to different average pricing subgroups and adds an allocation group identifier issued...
EP297 - Algo Trading Identifiers 4.43 MB 831 downloads April 29, 2025
This Extension Pack covers a request to provide data on ExecutionReport(35=8) messages relating to the usage of execution algorithms on orders. Specifically, these changes allow brokers to communicate...
EP296 - Korea Short Selling Registration Number 4.33 MB 1398 downloads April 16, 2025
This extension pack includes the ability for brokers operating in Korea and interfacing with the Korean Stock Exchange (KRX) to include their client's institutional short sell identifier assigned by the...
EP295 - Algo Certification Enhancements 5.99 MB 2332 downloads March 5, 2025
This extension pack addresses Algo Certification gaps found with the introduction of EP292. Revision History April 5, 2025 SPEC-2868 Correct synopsis of component TestSystemModuleGrp ...
EP294 - Errors and Omissions 2023-2024 31.92 MB 2012 downloads March 5, 2025
This extension pack corrects errors and omissions discovered in the FIX Latest Standard, e.g. misspellings or gaffes in the description. ...
EP293 - Non-USD FX NDF Enhancements 4.71 MB 498 downloads January 12, 2025
This enhancement addresses the existing RateSource component gaps and clarifies the usage of the component for FX NDF fixings as the markets have evolved. Revision history 3/5/2025 - SPEC-2849 - Correct...
EP292 - Algo Certification 5.59 MB 2936 downloads August 7, 2024
The FIX Algorithmic Trading Working Group members have developed this extension to support the algorithmic trading regulatory requirements in Europe as defined by MiFIR. The investment firms engaged in...
EP291 - GPTWG Allocation Timestamps 4.89 MB 2632 downloads July 17, 2024
This extension pack enhances the existing Allocations message set to support the SEC requirements for capturing timestamps. Revision History 12/9/2024 - SPEC-2807 - Correct field description of QuoteRequestRejectReason(658) ...
EP290 - FX Reject Code Enhancements 4.37 MB 3436 downloads June 29, 2024
This extension pack includes the enhancements of reject codes to meet the Investment Association's proposed categories to meet the requirements of the FX Global Code. Revision History 5/22/2025 - SPEC-2885...
EP289 - EU/UK Post-Trade Transparency 4.68 MB 1258 downloads June 24, 2024
This extension pack includes a number of enhancements for equities post-trade transparency in the EU and UK that may also be useful in other jurisdictions. ...
EP288 - Security Risk Metrics 4.54 MB 2364 downloads June 10, 2024
This extension pack introduces a new FIX message to publish option Greeks. Option Greeks provides a measure of risk of an option, factors which influence the price of an option. ...
EP287 - Maturity Frequency 4.50 MB 5200 downloads February 8, 2024
This extension pack addresses FIX Protocol requirements related to the maturity information provided for derivative instruments. It adds the capability to convey the frequency with which the contracts...
EP286 - Addendum to MMT v4.0 and v4.1 4.29 MB 1717 downloads January 8, 2024
This extension pack includes support for MMT level 1: More granular Market Mechanisms ('Hybrid System’ and ‘Any Other excluding Hybrid’) for market data messages and MMT level 2: Trading Mode ‘On...
EP285 - Average Pricing Enhancement 4.67 MB 630 downloads January 8, 2024
This extension pack includes enhanced support for average pricing with the ability to provide quantities (total, changed, remaining) for one or more virtual subgroups in addition to the quantities (total,...
EP284 - EMIR Report Tracking Number 4.47 MB 4001 downloads September 15, 2023
This extension pack includes the Report Tracking Number (RTN) under the EMIR reporting format is a unique number assigned to the execution and common among a group of reports related to the same execution. Updates 12/11/2023...
EP283 - UK Post Trade Transparency 3.65 MB 2398 downloads September 15, 2023
This Extension Pack includes requirements for equities post-trade transparency as laid out in the UK FCA’s policy statement PS 23/4 of May 2023, section 3 (https://www.fca.org.uk/publication/policy/ps23- 4.pdf). Updates 9/22/2023...
EP282 - Errors & Omissions 2022 6.04 MB 6851 downloads August 31, 2023
This extension pack addresses errors and omissions resolved in 2022. Updates 6/24/2025 - SPEC-2888 - Correct elaborations of ExecMethod(2405) = 0 (Undefined) and 1 (Manual) (ASBUILT update only) 9/22/2023...