LegSecurityAltID (FIX tag 605)

StringFIX 4.4

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

At a glance

Tag
605
Name
LegSecurityAltID
Datatype
String
Dialects
FIX 4.4
Messages
50

What the specification says

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

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.

MessageMsgTypeRequirednessWhere in the message
Advertisement7Conditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
AllocationInstructionJConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
AllocationReportASConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
AssignmentReportAWConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CollateralAssignmentAYConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CollateralInquiryBBConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CollateralInquiryAckBGConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CollateralReportBAConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CollateralRequestAXConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CollateralResponseAZConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
ConfirmationAKConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CrossOrderCancelReplaceRequesttConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
CrossOrderCancelRequestuConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
DerivativeSecurityListAAConditionalinside RelSymDerivSecGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
DontKnowTradeQConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
EmailCConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
ExecutionReport8Conditionalinside InstrmtLegExecGrp › InstrumentLeg › LegSecAltIDGrp
IOI6Conditionalinside InstrmtLegIOIGrp › InstrumentLeg › LegSecAltIDGrp
MarketDataIncrementalRefreshXConditionalinside MDIncGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
MarketDataRequestVConditionalinside InstrmtMDReqGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
MarketDataSnapshotFullRefreshWConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
MassQuoteiConditionalinside QuotSetGrp › QuotEntryGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
MassQuoteAcknowledgementbConditionalinside QuotSetAckGrp › QuotEntryAckGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
MultilegOrderCancelReplaceACConditionalinside LegOrdGrp › InstrumentLeg › LegSecAltIDGrp
NewOrderCrosssConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
NewOrderMultilegABConditionalinside LegOrdGrp › InstrumentLeg › LegSecAltIDGrp
NewsBConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
PositionMaintenanceReportAMConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
PositionMaintenanceRequestALConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
PositionReportAPConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
QuoteSConditionalinside LegQuotGrp › InstrumentLeg › LegSecAltIDGrp
QuoteCancelZConditionalinside QuotCxlEntriesGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
QuoteRequestRConditionalinside QuotReqGrp › QuotReqLegsGrp › InstrumentLeg › LegSecAltIDGrp
QuoteRequestRejectAGConditionalinside QuotReqRjctGrp › QuotReqLegsGrp › InstrumentLeg › LegSecAltIDGrp
QuoteResponseAJConditionalinside LegQuotGrp › InstrumentLeg › LegSecAltIDGrp
QuoteStatusReportAIConditionalinside LegQuotStatGrp › InstrumentLeg › LegSecAltIDGrp
QuoteStatusRequestaConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
RFQRequestAHConditionalinside RFQReqGrp › InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
RequestForPositionsANConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
RequestForPositionsAckAOConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
SecurityDefinitiondConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
SecurityDefinitionRequestcConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
SecurityListyConditionalinside SecListGrp › InstrmtLegSecListGrp › InstrumentLeg › LegSecAltIDGrp
SecurityListRequestxConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
SecurityStatusfConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
SecurityStatusRequesteConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
TradeCaptureReportAEConditionalinside TrdInstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
TradeCaptureReportAckARConditionalinside TrdInstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
TradeCaptureReportRequestADConditionalinside InstrmtLegGrp › InstrumentLeg › LegSecAltIDGrp
TradeCaptureReportRequestAckAQConditionalinside 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