LastParPx (FIX tag 669)

PriceFIX 4.4

LastParPx (tag 669) is a Price field defined in FIX 4.4. It appears in 4 message types, always optionally.

At a glance

Tag: 669
Name: LastParPx
Datatype: Price (float)
Dialects: FIX 4.4
Messages: 4

What the specification says

Last price expressed in percent-of-par. Conditionally required for Fixed Income trades when LastPx (3) is expressed in Yield, Spread, Discount or any other type. Usage: Execution Report and Allocation Report repeating executions block (from sellside).

Descriptions are quoted from the FIX Orchestra sources under the Apache 2.0 licence.

A real message using tag 669

ExecutionReport · FIX 4.4

Tag	Field	Wire value	Meaning
8	BeginString	FIX.4.4
9	BodyLength	145
35	MsgType	8	Execution Report
49	SenderCompID	BOARTEAM
56	TargetCompID	COUNTERPARTY
34	MsgSeqNum	2
52	SendingTime	20240101-12:00:00.000
37	OrderID	ORD-10042
17	ExecID	EXEC-88117
150	ExecType	0	New
39	OrdStatus	0	New
54	Side	1	Buy
669	LastParPx	1.09210
151	LeavesQty	0
14	CumQty	1000000
6	AvgPx	1.09215
10	CheckSum	090

Edit and decode it yourself

Shown with | separators for readability. On the wire FIX uses SOH (0x01), an invisible control byte — and because BodyLength and CheckSum are computed over the actual bytes, the two forms have different checksums. Both are valid and both decode here.

Open in the full decoder →

Generated from the FIX 4.4 dictionary and verified at build time: it parses and validates with no issues. Open the decoder to try your own message.

Where tag 669 appears

Requiredness is a property of the message, not of the field: the same tag can be optional in one message and conditionally required in another.

Message	MsgType	Requiredness	Where in the message
AllocationInstruction	J	Conditional	inside the ExecAllocGrp component
AllocationReport	AS	Conditional	inside the ExecAllocGrp component
ExecutionReport	8	Conditional	directly on the message body
TradeCaptureReport	AE	Conditional	directly on the message body

Wire format

A decimal price. Precision is a venue convention, not a protocol rule, so compare the raw string when exactness matters. @boarteam/fix parses the value as a number and reports parse/invalid-float when it does not lex as one; the raw string is kept so precision and trailing zeros are never lost.

Read tag 669 in TypeScript

decode.tsts

import { createFixEngine } from "@boarteam/fix";import { dictionary } from "@boarteam/fix-dict-fix44";const fix = createFixEngine(dictionary);const { message, issues } = fix.parse(raw);const field = message.fields[669];field?.name;   // "LastParPx"field?.raw;    // the verbatim wire stringfield?.value;  // coerced to a number

Decode this in your own code

The same engine that produced the decoded example above is an Apache-2.0 npm package with zero runtime dependencies. It runs in Node and in the browser, and parse() returns problems as data instead of throwing.

npm i @boarteam/fix @boarteam/fix-dict-fix44

Try the decoder Source on GitHub