FIX 4.4 - contains 83 business messages (956 fields)
The FIX 4.4 specification delivered enhancements over FIX 4.3 in the following areas:

Improved support for fixed income including Treasuries, Municipals, Corporates, Repos and Security Lending
Enhancements to Quoting messages to support fixed income negotiation process
Minor enhancements to single and muli-leg orders to support fixed income
Allocation model to support 2-party Fixed Income trading.
Enhanced Allocation and Trade Capture Report messaging to support 3rd party FI reporting.
Enhanced Allocation messaging for street-side listed futures and options. New 'allocation claim' or response messages.
Enhanced Trade Capture Report to support blocks and exchange for (off floor) reporting for listed futures and options.
Added new messages to support Position Maintenance.
Added new messages to support Assignment Reporting.
Cleaner Allocation messaging with AllocationInstruction and AllocationReport and their corresponding Ack messages
Move away from 'implicit' allocation confirmation towards explicit confirmation with new Confirmation messages
Improved 'ready-to-book' messaging using the allocation message set.
Improved SSI support with new SettlementInstructionsRequest message
Improved support for the concept of 'warehousing' which is applicable to certain markets.
Overall enhancements to Trade Capture Report messaging.
Overall enhancements to multi-leg instrument support.

	Created by Thiago Pavesi almost 8 years ago

Introduction on the hows and whys of Financial Information Exchange Protocol

What is FIX protocol? (Intro)