LegRatioQty (FIX tag 623)

floatFIX 4.4FIX 5.0 SP2

LegRatioQty (tag 623) is a float field defined in FIX 4.4 and FIX 5.0 SP2. It appears in 50 message types, always optionally.

At a glance

Tag
623
Name
LegRatioQty
Datatype
float
Dialects
FIX 4.4 and FIX 5.0 SP2
Messages
50

What the specification says

The ratio of quantity for this individual leg relative to the entire multileg security.

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

A real message using tag 623

ExecutionReport · FIX 4.4
TagFieldWire valueMeaning
8BeginStringFIX.4.4
9BodyLength179
35MsgType8Execution Report
49SenderCompIDBOARTEAM
56TargetCompIDCOUNTERPARTY
34MsgSeqNum2
52SendingTime20240101-12:00:00.000
37OrderIDORD-10042
17ExecIDEXEC-88117
150ExecType0New
39OrdStatus0New
54Side1Buy
151LeavesQty0
14CumQty1000000
6AvgPx1.09215
555NoLegs2 entries2repeating group
600LegSymbolEXAMPLE
623LegRatioQty1.0
600LegSymbolEXAMPLE
623LegRatioQty1.0
10CheckSum194
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 623 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.

MessageMsgTypeFIX 4.4FIX 5.0 SP2Where in the message
Advertisement7OptionalOptionalinside InstrmtLegGrp › InstrumentLeg
AllocationInstructionJOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
AllocationInstructionAlertBMOptionalinside InstrmtLegGrp › InstrumentLeg
AllocationReportASOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
AssignmentReportAWOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
CollateralAssignmentAYOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
CollateralInquiryBBOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
CollateralInquiryAckBGOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
CollateralReportBAOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
CollateralRequestAXOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
CollateralResponseAZOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
ConfirmationAKOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
CrossOrderCancelReplaceRequesttOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
CrossOrderCancelRequestuOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
DerivativeSecurityListAAOptionalOptionalinside RelSymDerivSecGrp › InstrmtLegGrp › InstrumentLeg
DerivativeSecurityListUpdateReportBROptionalinside RelSymDerivSecUpdGrp › InstrmtLegGrp › InstrumentLeg
DontKnowTradeQOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
EmailCOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
ExecutionAcknowledgementBNOptionalinside InstrmtLegGrp › InstrumentLeg
ExecutionReport8OptionalOptionalinside InstrmtLegExecGrp › InstrumentLeg
IOI6OptionalOptionalinside InstrmtLegIOIGrp › InstrumentLeg
MarketDataIncrementalRefreshXOptionalOptionalinside MDIncGrp › InstrmtLegGrp › InstrumentLeg
MarketDataRequestVOptionalOptionalinside InstrmtMDReqGrp › InstrmtLegGrp › InstrumentLeg
MarketDataSnapshotFullRefreshWOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
MassQuoteiOptionalOptionalinside QuotSetGrp › QuotEntryGrp › InstrmtLegGrp › InstrumentLeg
MassQuoteAcknowledgementbOptionalOptionalinside QuotSetAckGrp › QuotEntryAckGrp › InstrmtLegGrp › InstrumentLeg
MultilegOrderCancelReplaceACOptionalOptionalinside LegOrdGrp › InstrumentLeg
NewOrderCrosssOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
NewOrderMultilegABOptionalOptionalinside LegOrdGrp › InstrumentLeg
NewsBOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
PositionMaintenanceReportAMOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
PositionMaintenanceRequestALOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
PositionReportAPOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
QuoteSOptionalOptionalinside LegQuotGrp › InstrumentLeg
QuoteCancelZOptionalOptionalinside QuotCxlEntriesGrp › InstrmtLegGrp › InstrumentLeg
QuoteRequestROptionalOptionalinside QuotReqGrp › QuotReqLegsGrp › InstrumentLeg
QuoteRequestRejectAGOptionalOptionalinside QuotReqRjctGrp › QuotReqLegsGrp › InstrumentLeg
QuoteResponseAJOptionalOptionalinside LegQuotGrp › InstrumentLeg
QuoteStatusReportAIOptionalOptionalinside LegQuotStatGrp › InstrumentLeg
QuoteStatusRequestaOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
RFQRequestAHOptionalOptionalinside RFQReqGrp › InstrmtLegGrp › InstrumentLeg
RequestForPositionsANOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
RequestForPositionsAckAOOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
SecurityDefinitiondOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
SecurityDefinitionRequestcOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
SecurityDefinitionUpdateReportBPOptionalinside InstrmtLegGrp › InstrumentLeg
SecurityListyOptionalOptionalinside SecListGrp › InstrmtLegSecListGrp › InstrumentLeg
SecurityListRequestxOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
SecurityListUpdateReportBKOptionalinside SecLstUpdRelSymGrp › SecLstUpdRelSymsLegGrp › InstrumentLeg
SecurityStatusfOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
SecurityStatusRequesteOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
TradeCaptureReportAEOptionalOptionalinside TrdInstrmtLegGrp › InstrumentLeg
TradeCaptureReportAckAROptionalOptionalinside TrdInstrmtLegGrp › InstrumentLeg
TradeCaptureReportRequestADOptionalOptionalinside InstrmtLegGrp › InstrumentLeg
TradeCaptureReportRequestAckAQOptionalOptionalinside InstrmtLegGrp › InstrumentLeg

Wire format

A decimal number. The wire form keeps its trailing zeros, which is why decoders expose the raw string alongside the parsed number. @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 623 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[623];field?.name;   // "LegRatioQty"field?.raw;    // the verbatim wire stringfield?.value;  // coerced to a number

Other float fields

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