---
title: <NestedParties> component block – FIX 5.0 – FIX Dictionary – Onix Solutions
description: <NestedParties> component block – FIX 5.0 – FIX Dictionary – Onix Solutions
---

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# <NestedParties> component block – FIX 5.0 – FIX Dictionary

| Messages by MsgType \| Messages by Name \| Fields by Tag \| Fields by Name \| FIX 5.0 \| Home FIX 5.0 : <NestedParties> component block Structure \| Used In Description The Nested<Parties> component block is identical to the <Parties> Block. It is used in other component blocks and repeating groups when nesting will take place resulting in multiple occurrences of the <Parties> block within a single FIX message.. Use of Nested<Parties> under these conditions avoids multiple references to the <Parties> block within the same message which is not allowed in FIX tag/value syntax. Structure Tag Field Name Req'd Comments 539 NoNestedPartyIDs N Number of NestedPartyID (524), NestedPartyIDSource (525), and NestedPartyRole (538) entries => 524 NestedPartyID N Used to identify source of NestedPartyID. Required if NestedPartyIDSource is specified. Required if NoNestedPartyIDs > 0. => 525 NestedPartyIDSource N Used to identify class source of NestedPartyID value (e.g. BIC). Required if NestedPartyID is specified. Required if NoNestedPartyIDs > 0. => 538 NestedPartyRole N Identifies the type of NestedPartyID (e.g. Executing Broker). Required if NoNestedPartyIDs > 0. => Component Block - <NstdPtysSubGrp> N Repeating group of NestedParty sub-identifiers. Used In <AllocAckGrp> <AllocGrp> <InstrmtLegExecGrp> <LegOrdGrp> <LegQuotGrp> <LegQuotStatGrp> <PositionQty> <PreAllocGrp> <QuotReqLegsGrp> <RgstDtlsGrp> <TrdInstrmtLegGrp> |
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