---
title: "FIX 5.0 SP2 EP299: <NestedParties> component block – FIX Dictionary – Onix Solutions"
description: "<meta name=\"description\" content=\"&lt;NestedParties&gt; component block &ndash; FIX 5.0 SP2 EP299, FIX protocol version FIX 5.0 SP2 EP299\" /> <meta name=\"keywords\" content=\"component block, NestedParties, FIX 5.0 SP2 EP299, FIX Protocol, FIX dictionary\" />"
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# <NestedParties> component block

## FIX 5.0 SP2 EP299

### Description

 The [<NestedParties>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_NestedParties.html) component block is identical to the [<Parties>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_Parties.html) Block. It is used in other component blocks and repeating groups when nesting will take place resulting in multiple occurrences of the [<Parties>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_Parties.html) block within a single FIX message. Use of [<NestedParties>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_NestedParties.html) under these conditions avoids multiple references to the [<Parties>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_Parties.html) block within the same message which is not allowed in FIX tag/value syntax.

### Structure

| Tag | Field Name | Req'd | Comments |  |
| --- | --- | --- | --- | --- |
| 539 | [NoNestedPartyIDs](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_539.html) | N | Repeating group below should contain unique combinations of NestedPartyID, NestedPartyIDSource, and NestedPartyRole |  |
| → | 524 | [NestedPartyID](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_524.html) | N | Used to identify source of NestedPartyID. Required if NestedPartyIDSource is specified. Required if NoNestedPartyIDs > 0. |
| → | 525 | [NestedPartyIDSource](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_525.html) | N | Used to identify class source of NestedPartyID value (e.g. BIC). Required if NestedPartyID is specified. Required if NoNestedPartyIDs > 0. |
| → | 538 | [NestedPartyRole](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_538.html) | N | Identifies the type of NestedPartyID (e.g. Executing Broker). Required if NoNestedPartyIDs > 0. |
| → | 2384 | [NestedPartyRoleQualifier](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_2384.html) | N |  |
| → | [Component Block - <NstdPtysSubGrp>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_NstdPtysSubGrp.html) | N | Repeating group of NestedParty sub-identifiers. |  |

### Used In

- [<AllocAckGrp>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_AllocAckGrp.html)
- [<AllocGrp>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_AllocGrp.html)
- [<ApplIDRequestAckGrp>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_ApplIDRequestAckGrp.html)
- [<ApplIDRequestGrp>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_ApplIDRequestGrp.html)
- [<LegOrdGrp>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_LegOrdGrp.html)
- [<LegQuotGrp>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_LegQuotGrp.html)
- [<LegQuotStatGrp>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_LegQuotStatGrp.html)
- [<MDStatisticParameters>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_MDStatisticParameters.html)
- [<PositionQty>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_PositionQty.html)
- [<PreAllocGrp>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_PreAllocGrp.html)
- [<QuotReqLegsGrp>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_QuotReqLegsGrp.html)
- [<RgstDtlsGrp>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_RgstDtlsGrp.html)
- [<SettlTradeDetails>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_SettlTradeDetails.html)
- [<TestScenarioGrp>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_TestScenarioGrp.html)
- [<TrdInstrmtLegGrp>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_TrdInstrmtLegGrp.html)

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