FIX Protocol Dictionary by Version

Each FIX version defines its own set of messages, fields and values. Pick the version your counterparty uses to see its message types with their fields in order, and every tag with the values valid in that version. FIX 4.2 and FIX 4.4 are the versions most firms run. FIX 5.0 and its service packs run over the FIXT 1.1 session layer, so their sessions start with 8=FIXT.1.1. For a summary across all versions, see the FIX tag reference and the message type reference.

• FIX 5.0 SP2

  8=FIXT.1.1

  The latest version, including the extension packs: risk limits, party entitlements, stream assignment and many derivatives fields. Runs over FIXT 1.1.

  164 message types · 6,028 tags

• FIX 5.0 SP1

  8=FIXT.1.1

  Service pack that adds market structure messages such as Market Definition, plus order mass actions. Runs over FIXT 1.1.

  113 message types · 1,373 tags

• FIX 5.0

  8=FIXT.1.1

  Separates the session layer: application messages run over the FIXT 1.1 transport, and ApplVerID (1128) names the application version.

  101 message types · 1,100 tags

• FIX 4.4

  Most used

  8=FIX.4.4

  The most used version for order routing. Adds trade capture acknowledgements, position management, collateral and user requests.

  93 message types · 912 tags

• FIX 4.3

  8=FIX.4.3

  Adds the Parties component, SecurityIDSource (22), trade capture reports and order mass cancel.

  68 message types · 635 tags

• FIX 4.2

  Most used

  8=FIX.4.2

  One of the two most used versions. Adds market data, security definitions and the Business Message Reject.

  46 message types · 405 tags

• FIX 4.1

  8=FIX.4.1

  Adds settlement instructions and execution fields such as ExecType (150) and LeavesQty (151).

  28 message types · 206 tags

• FIX 4.0

  8=FIX.4.0

  The early version: order entry, executions, quotes, indications of interest, order lists and allocations.

  27 message types · 138 tags