Major changes in FIX 4.0 include enhancements in the following areas:

  • Session layer
  • Header information
  • Supported encryption
  • Date fields were modified
  • Allocation support was significantly improved

Documents

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FIX 4.0 - FIX 5.0 SP2 Unified Repository 2.54 MB 1695 downloads May 7, 2014

FIX Unified and Basic Repository files for versions FIX 4.0 - FIX 5.0 SP2 (up to EP97) Revised April 2, 2020 for FIXT-4 (enumeration of session level messages corrected). ...
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FIX 4.0 Specification Documents - MS Word 73.38 KB 160 downloads July 30, 2017

Specification Document and Release Notes (ZIP of MS Word) ...
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FIX 4.0 Specification Release Notes 55.98 KB 251 downloads July 30, 2017

FIX 4.0 Overview ...
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FIX 4.0 Specification Documents - PDF 486.71 KB 651 downloads July 30, 2017

Specification Document and Release Notes (ZIP of PDF) ...
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FIX 4.0 - FIXimate for offline use 41.31 KB 477 downloads July 30, 2017

Download the FIXimate web browser-based cross-referencing tool for the FIX Protocol specification. ...
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