FIX Latest Online Specification

(as of EP264)
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.


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


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.