---
title: "FIX 5.0 SP2 EP299: SecurityDefinitionRequest <c> message – FIX Dictionary – Onix Solutions"
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# SecurityDefinitionRequest <c> message

## FIX 5.0 SP2 EP299

### Description

 The Security Definition Request message is used for the following:

1. Request a specific Security to be traded with the second party. The request security can be defined as a multileg security made up of one or more instrument legs.
2. Request a set of individual securities for a single market segment.
3. Request all securities, independent of market segment.

 Subscription for security status can be optionally specified by including the [SubscriptionRequestType <263>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_263.html) field on the message.

 See "Security Definition, Security Status, and Trading Session Message Scenarios"

 Security Definition Request

### Structure

| Tag | Field Name | Req'd | Comments |
| --- | --- | --- | --- |
| [Component Block - <StandardHeader>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_StandardHeader.html) | Y | [MsgType <35>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_35.html) = c (lowercase) |  |
| 320 | [SecurityReqID](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_320.html) | Y |  |
| 321 | [SecurityRequestType](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_321.html) | Y |  |
| 1301 | [MarketID](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_1301.html) | N | Identifies the market for which the security definition request is being made. |
| 1300 | [MarketSegmentID](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_1300.html) | N | Identifies the segment of the market for which the security definition request is being made. |
| [Component Block - <Instrument>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_Instrument.html) | N | Insert here the set of "Instrument" (symbology) fields defined in "Common Components of Application Messages" of the requested Security |  |
| [Component Block - <InstrumentExtension>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_InstrumentExtension.html) | N | Insert here the set of "InstrumentExtension" fields defined in "Common Components of Application Messages" |  |
| [Component Block - <FinancingDetails>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_FinancingDetails.html) | N |  |  |
| [Component Block - <UndInstrmtGrp>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_UndInstrmtGrp.html) | N | Number of underlyings |  |
| [Component Block - <RelatedInstrumentGrp>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_RelatedInstrumentGrp.html) | N |  |  |
| 15 | [Currency](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_15.html) | N |  |
| 2897 | [CurrencyCodeSource](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_2897.html) | N |  |
| 376 | [ComplianceID](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_376.html) | N |  |
| 2404 | [ComplianceText](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_2404.html) | N |  |
| 2351 | [EncodedComplianceTextLen](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_2351.html) | N | Must be set if [EncodedComplianceText <2352>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_2352.html) field is specified and must immediately precede it. |
| 2352 | [EncodedComplianceText](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_2352.html) | N | Encoded (non-ASCII characters) representation of the [ComplianceText <2404>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_2404.html) field in the encoded format specified via the [MessageEncoding <347>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_347.html) field. |
| 58 | [Text](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_58.html) | N | Comment, instructions, or other identifying information. |
| 354 | [EncodedTextLen](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_354.html) | N | Must be set if EncodedText field is specified and must immediately precede it. |
| 355 | [EncodedText](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_355.html) | N | Encoded (non-ASCII characters) representation of the Text field in the encoded format specified via the MessageEncoding field. |
| 336 | [TradingSessionID](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_336.html) | N | Optional Trading Session Identifier to specify a particular trading session for which you want to obtain a list of securities that are tradeable. |
| 625 | [TradingSessionSubID](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_625.html) | N |  |
| [Component Block - <Stipulations>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_Stipulations.html) | N |  |  |
| [Component Block - <InstrmtLegGrp>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_InstrmtLegGrp.html) | N | Number of legs that make up the Security |  |
| [Component Block - <SpreadOrBenchmarkCurveData>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_SpreadOrBenchmarkCurveData.html) | N |  |  |
| [Component Block - <YieldData>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_YieldData.html) | N |  |  |
| 827 | [ExpirationCycle](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_827.html) | N |  |
| 263 | [SubscriptionRequestType](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/tagNum_263.html) | N | Subscribe or unsubscribe for security status to security specified in request. |
| [Component Block - <StandardTrailer>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/compBlock_StandardTrailer.html) | Y |  |  |

### Related Messages

- [TradingSessionStatusRequest <g>](https://www.onixs.biz/fix-dictionary/5.0.sp2.ep299/msgType_g_103.html)

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