LegSecurityAltID (FIX tag 605)

StringFIX 4.4FIX 5.0 SP2

LegSecurityAltID (tag 605) is a String field defined in FIX 4.4 and FIX 5.0 SP2. It appears in 50 message types, always optionally.

At a glance

Tag
605
Name
LegSecurityAltID
Datatype
String
Dialects
FIX 4.4 and FIX 5.0 SP2
Messages
50

What the specification says

FIX 4.4

Multileg instrument's individual security’s SecurityAltID. See SecurityAltID (455) field for description

FIX 5.0 SP2

Multileg instrument's individual security's SecurityAltID.

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

A real message using tag 605

MarketDataSnapshotFullRefresh · FIX 4.4
TagFieldWire valueMeaning
8BeginStringFIX.4.4
9BodyLength123
35MsgTypeWMarket Data-Snapshot/Full Refresh
49SenderCompIDBOARTEAM
56TargetCompIDCOUNTERPARTY
34MsgSeqNum2
52SendingTime20240101-12:00:00.000
555NoLegs1 entry1repeating group
600LegSymbolEXAMPLE
604NoLegSecurityAltID2 entries2repeating group
605LegSecurityAltIDEXAMPLE
605LegSecurityAltIDEXAMPLE
268NoMDEntries1 entry1repeating group
269MDEntryType0Bid
10CheckSum226
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 605 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
Advertisement7ConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
AllocationInstructionJConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
AllocationInstructionAlertBMOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
AllocationReportASConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
AssignmentReportAWConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CollateralAssignmentAYConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CollateralInquiryBBConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CollateralInquiryAckBGConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CollateralReportBAConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CollateralRequestAXConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CollateralResponseAZConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
ConfirmationAKConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CrossOrderCancelReplaceRequesttConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CrossOrderCancelRequestuConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
DerivativeSecurityListAAConditionalOptionalinside RelSymDerivSecGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
DerivativeSecurityListUpdateReportBROptionalinside RelSymDerivSecUpdGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
DontKnowTradeQConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
EmailCConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
ExecutionAcknowledgementBNOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
ExecutionReport8ConditionalOptionalinside InstrmtLegExecGrp › InstrumentLeg › LegSecAltIDGrp
IOI6ConditionalOptionalinside InstrmtLegIOIGrp › InstrumentLeg › LegSecAltIDGrp
MarketDataIncrementalRefreshXConditionalOptionalinside MDIncGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
MarketDataRequestVConditionalOptionalinside InstrmtMDReqGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
MarketDataSnapshotFullRefreshWConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
MassQuoteiConditionalOptionalinside QuotSetGrp › QuotEntryGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
MassQuoteAcknowledgementbConditionalOptionalinside QuotSetAckGrp › QuotEntryAckGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
MultilegOrderCancelReplaceACConditionalOptionalinside LegOrdGrp › InstrumentLeg › LegSecAltIDGrp
NewOrderCrosssConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
NewOrderMultilegABConditionalOptionalinside LegOrdGrp › InstrumentLeg › LegSecAltIDGrp
NewsBConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
PositionMaintenanceReportAMConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
PositionMaintenanceRequestALConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
PositionReportAPConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
QuoteSConditionalOptionalinside LegQuotGrp › InstrumentLeg › LegSecAltIDGrp
QuoteCancelZConditionalOptionalinside QuotCxlEntriesGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
QuoteRequestRConditionalOptionalinside QuotReqGrp › QuotReqLegsGrp › InstrumentLeg › LegSecAltIDGrp
QuoteRequestRejectAGConditionalOptionalinside QuotReqRjctGrp › QuotReqLegsGrp › InstrumentLeg › LegSecAltIDGrp
QuoteResponseAJConditionalOptionalinside LegQuotGrp › InstrumentLeg › LegSecAltIDGrp
QuoteStatusReportAIConditionalOptionalinside LegQuotStatGrp › InstrumentLeg › LegSecAltIDGrp
QuoteStatusRequestaConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
RFQRequestAHConditionalOptionalinside RFQReqGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
RequestForPositionsANConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
RequestForPositionsAckAOConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
SecurityDefinitiondConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
SecurityDefinitionRequestcConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
SecurityDefinitionUpdateReportBPOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
SecurityListyConditionalOptionalinside SecListGrp › InstrmtLegSecListGrp › InstrumentLeg › LegSecAltIDGrp
SecurityListRequestxConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
SecurityListUpdateReportBKOptionalinside SecLstUpdRelSymGrp › SecLstUpdRelSymsLegGrp › InstrumentLeg › LegSecAltIDGrp
SecurityStatusfConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
SecurityStatusRequesteConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
TradeCaptureReportAEConditionalOptionalinside TrdInstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
TradeCaptureReportAckARConditionalOptionalinside TrdInstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
TradeCaptureReportRequestADConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
TradeCaptureReportRequestAckAQConditionalOptionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp

Wire format

Free-form text. Any byte except the SOH separator is legal, so values are not trimmed or case-folded on the wire. @boarteam/fix keeps the value as a string; format rules are checked by validate(), which reports validate/invalid-value rather than throwing.

Read tag 605 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[605];field?.name;   // "LegSecurityAltID"field?.raw;    // the verbatim wire stringfield?.value;  // coerced to a string

Other String 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