NoPartyIDs (FIX tag 453)

NumInGroupFIX 4.4group counter

NoPartyIDs (tag 453) is a NumInGroup field defined in FIX 4.4. It appears in 44 message types, always optionally. Its datatype is NumInGroup, which makes it a repeating-group counter: its value is the number of entries that follow, not a quantity in its own right.

At a glance

Tag: 453
Name: NoPartyIDs
Datatype: NumInGroup (int)
Dialects: FIX 4.4
Messages: 44

What the specification says

Number of PartyID (448), PartyIDSource (447), and PartyRole (452) entries

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

A real message using tag 453

ExecutionReport · FIX 4.4

Tag	Field	Wire value	Meaning
8	BeginString	FIX.4.4
9	BodyLength	163
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
453	NoPartyIDs2 entries	2	repeating group
448	PartyID	EXAMPLE
448	PartyID	EXAMPLE
17	ExecID	EXEC-88117
150	ExecType	0	New
39	OrdStatus	0	New
54	Side	1	Buy
151	LeavesQty	0
14	CumQty	1000000
6	AvgPx	1.09215
10	CheckSum	252

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 453 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	Optional	inside the Parties component
AllocationInstructionAck	P	Optional	inside the Parties component
AllocationReport	AS	Optional	inside the Parties component
AllocationReportAck	AT	Optional	inside the Parties component
AssignmentReport	AW	Optional	inside the Parties component
CollateralAssignment	AY	Optional	inside the Parties component
CollateralInquiry	BB	Optional	inside the Parties component
CollateralInquiryAck	BG	Optional	inside the Parties component
CollateralReport	BA	Optional	inside the Parties component
CollateralRequest	AX	Optional	inside the Parties component
CollateralResponse	AZ	Optional	inside the Parties component
Confirmation	AK	Optional	inside the Parties component
CrossOrderCancelReplaceRequest	t	Optional	inside SideCrossOrdModGrp › Parties
CrossOrderCancelRequest	u	Optional	inside SideCrossOrdCxlGrp › Parties
ExecutionReport	8	Optional	inside the Parties component
MassQuote	i	Optional	inside the Parties component
MassQuoteAcknowledgement	b	Optional	inside the Parties component
MultilegOrderCancelReplace	AC	Optional	inside the Parties component
NewOrderCross	s	Optional	inside SideCrossOrdModGrp › Parties
NewOrderList	E	Optional	inside ListOrdGrp › Parties
NewOrderMultileg	AB	Optional	inside the Parties component
NewOrderSingle	D	Optional	inside the Parties component
OrderCancelReplaceRequest	G	Optional	inside the Parties component
OrderCancelRequest	F	Optional	inside the Parties component
OrderMassStatusRequest	AF	Optional	inside the Parties component
OrderStatusRequest	H	Optional	inside the Parties component
PositionMaintenanceReport	AM	Optional	inside the Parties component
PositionMaintenanceRequest	AL	Optional	inside the Parties component
PositionReport	AP	Optional	inside the Parties component
Quote	S	Optional	inside the Parties component
QuoteCancel	Z	Optional	inside the Parties component
QuoteRequest	R	Optional	inside QuotReqGrp › Parties
QuoteRequestReject	AG	Optional	inside QuotReqRjctGrp › Parties
QuoteResponse	AJ	Optional	inside the Parties component
QuoteStatusReport	AI	Optional	inside the Parties component
QuoteStatusRequest	a	Optional	inside the Parties component
RegistrationInstructions	o	Optional	inside the Parties component
RegistrationInstructionsResponse	p	Optional	inside the Parties component
RequestForPositions	AN	Optional	inside the Parties component
RequestForPositionsAck	AO	Optional	inside the Parties component
SettlementInstructionRequest	AV	Optional	inside the Parties component
SettlementInstructions	T	Optional	inside SettlInstGrp › Parties
TradeCaptureReport	AE	Optional	inside TrdCapRptSideGrp › Parties
TradeCaptureReportRequest	AD	Optional	inside the Parties component

Wire format

The number of entries in the repeating group that follows. The next field on the wire is the group's delimiter tag. @boarteam/fix parses the value as a number and reports parse/invalid-int when it does not lex as one; the raw string is kept either way.

Read tag 453 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);// NoPartyIDs is a group counter, so the entries live on message.groups —// NOT on message.fields. message.fields[453] is undefined.const entries = message.groups[453] ?? [];for (const entry of entries) {  // entry.fields is keyed by tag; entry.groups holds nested groups}

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