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Older Versions of FIX Protocol Specification Documents

FIX 2.7 Specification

FIX 2.7 Specification (No longer supported)
First version of FIX used in production. Released January 17, 1995
[17 January 1995]

FIX 3.0 Specification

FIX 3.0 Specification (No longer supported)
Released September 27, 1995
[27 September 1995]

FIX 4.1 Specification (Original)

FIX 4.1 Specification (Original release--Replaced by 4.1 Spec with Errata)
Original 4.1 version released April 1, 1998
[1 April 1998]

FIX 4.2 Specification (Original)

FIX 4.2 Specification (Original release--Replaced by 4.2 Spec with Errata)
Original 4.2 version released March 1, 2000
[14 August 2004]

FIX 4.3 Specification (Original)

FIX 4.3 Specification (Original release--Replaced by 4.3 Spec with Errata)
Original 4.3 version released August 24, 2001
[24 August 2001]

FIX 4.4 Specification (Original)

FIX 4.4 Specification (Original release--Replaced by 4.4 Spec with Errata)
Original 4.4 version released April 30, 2003
[30 April 2003]