FIX Latest Online Specification

(as of EP97)
Home / FIX Latest Online Specification

This is the starting page for FIX Latest, the specification of the application layer of the FIX Protocol. It provides the normative specification and is the successor of the previous specification documents “FIX Version 5.0 Service Pack 2 Specification with 20110818 Errata” (aka “Volume 1-7”). The previous specification documents also contained FIX Technical Standards (FIX tag=value, FIXML) as well as various guideline material that is not considered to be part of the normative specification. The online version of the normative specification is separate from the detailed layouts of the messages and components. The document version for download includes both in a single document.

FIX Technical Standard Specifications by FIX Protocol Ltd. are licensed under a Creative Commons Attribution-NoDerivatives 4.0 International License.


Data Types, User-Defined Fields, Global Components


Event Communication
Quotation Negotiation

Market Data
Securities Reference Data
Market Structure Reference Data


Single General Order Handling
Program Trading
Order Mass Handling
Cross Orders
Multileg Orders



Settlement Instruction
Registration Instruction
Trade Capture
Position Maintenance
Collateral Management


Business Rejects, Network Status, User Management, Application Sequencing



FIX Latest Specification - Introduction 692.73 KB 242 downloads

Introduction to FIX Latest and layouts of global common components ...

FIX Latest Specification - Pre-Trade 1.51 MB 156 downloads

Normative specification of the pre-trade business area of FIX Latest ...

FIX Latest Specification - Trade 1.31 MB 191 downloads

Normative specification of the trade business area of FIX Latest ...

FIX Latest Specification - Order State Changes 1.14 MB 139 downloads

Normative specification of the order state changes of FIX Latest ...

FIX Latest Specification - Post-Trade 1.50 MB 144 downloads

Normative specification of the post-trade business area of FIX Latest ...

FIX Latest Specification - Infrastructure 386.57 KB 157 downloads

Normative specification of the infrastructure business area of FIX Latest ...

    Code Lists

    FIX supports external code lists for certain fields. Code lists are maintained outside of the FIX Specification review process to support faster extensibility. A complete list can be found here.

    User Defined Fields

    The table on this page summarizes currently used custom fields.  At this time, the available tag numbers in the user defined range of 5000 to 9999 have all been allocated.


    FIX Algorithmic Trading Definition Language (FIXatdl) is an XML based standard to specify the user interface components for algorithmic trading. Please look here.


    FIX Market Model Typology (MMT) initiative is a collaborative effort established by a broad range of industry participants (trading/reporting venues, data vendors and buy/sell side participants). The initiative is committed to achieving a practical and common solution for standards on post-trade data across all asset classes subject to MiFID II.  Please look here for details.

    Supported Legacy Versions

    FIX currently supports three legacy versions FIX 4.2, FIX 4.4 and FIX 5.0 of the application messages that serve as the basis for standardization and automation of the electronic trading industry.

    Unsupported Legacy Versions

    The FIX Community discontinued support for earlier versions of FIX.  The specifications are archived on the website and continue to be accessible.