OrderCapacity (FIX tag 528)

charFIX 4.4FIX 5.0 SP2

OrderCapacity (tag 528) is a char field defined in FIX 4.4 and FIX 5.0 SP2. It appears in 14 message types and is required in 1 of them. It is an enumerated field with 6 defined values.

At a glance

Tag: 528
Name: OrderCapacity
Datatype: char
Dialects: FIX 4.4 and FIX 5.0 SP2
Messages: 14
Valid values: 6

What the specification says

FIX 4.4

Designates the capacity of the firm placing the order (as of FIX 4.3, this field replaced Rule80A (tag 47) --used in conjunction with OrderRestrictions (529) field) (see Volume : "Glossary" for value definitions)

FIX 5.0 SP2

Designates the capacity of the firm placing the order.

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

A real message using tag 528

NewOrderSingle · FIX 4.4

Tag	Field	Wire value	Meaning
8	BeginString	FIX.4.4
9	BodyLength	117
35	MsgType	D	Order – Single
49	SenderCompID	BOARTEAM
56	TargetCompID	COUNTERPARTY
34	MsgSeqNum	2
52	SendingTime	20240101-12:00:00.000
11	ClOrdID	ORD-10042
54	Side	1	Buy
60	TransactTime	20240101-12:00:00.000
40	OrdType	1	Market
528	OrderCapacity	A	Agency
10	CheckSum	020

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.

Valid values

A value outside this list is not a parse error — the message still decodes — but validate() reports it as validate/value-not-in-enum.

Value	Meaning	Symbolic name
A	Agency	AGENCY
G	Proprietary	PROPRIETARY
I	Individual	INDIVIDUAL
P	Principal (Note for CMS purposes, Principal includes Proprietary)	PRINCIPAL
R	Riskless Principal	RISKLESS_PRINCIPAL
W	Agent for Other Member	AGENT_FOR_OTHER_MEMBER

Where tag 528 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	FIX 4.4	FIX 5.0 SP2	Where in the message
Confirmation	AK	Required	Required	inside the CpctyConfGrp component
CrossOrderCancelReplaceRequest	t	Optional	Optional	inside the SideCrossOrdModGrp component
ExecutionReport	8	Optional	Optional	directly on the message body
MarketDataIncrementalRefresh	X	—	Optional	inside the MDIncGrp component
MarketDataSnapshotFullRefresh	W	—	Optional	inside the MDFullGrp component
MassQuote	i	—	Optional	inside QuotSetGrp › QuotEntryGrp
MassQuoteAcknowledgement	b	—	Optional	inside QuotSetAckGrp › QuotEntryAckGrp
MultilegOrderCancelReplace	AC	Optional	Optional	directly on the message body
NewOrderCross	s	Optional	Optional	inside the SideCrossOrdModGrp component
NewOrderList	E	Optional	Optional	inside the ListOrdGrp component
NewOrderMultileg	AB	Optional	Optional	directly on the message body
NewOrderSingle	D	Optional	Optional	directly on the message body
OrderCancelReplaceRequest	G	Optional	Optional	directly on the message body
Quote	S	Optional	Optional	directly on the message body
QuoteRequest	R	Optional	Optional	directly on the message body
QuoteResponse	AJ	Optional	Optional	directly on the message body
QuoteStatusReport	AI	—	Optional	directly on the message body
TradeCaptureReport	AE	Optional	Optional	inside the TrdCapRptSideGrp component
TradeCaptureReportAck	AR	Optional	Optional	directly on the message body

Wire format

A single character. Most char fields are enumerated, so the value is one of a fixed set rather than arbitrary text. @boarteam/fix keeps the value as a string and, for enumerated fields, reports validate/value-not-in-enum when it is not a defined value.

Read tag 528 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 orderCapacity = message.fields[528]?.raw;// e.g. "A" — Agency// The dictionary also carries the labels:const label = fix.dictionary  .fieldByTag(528)  ?.enumValues?.find((e) => e.value === orderCapacity)  ?.description;

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