The Security Definition Request (c) 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.
Subscription for security status can be optionally specified by including the SubscriptionRequestType[263] field on the message.
| Tag | Field Name | FIXML | Req'd | Comments | |||
|---|---|---|---|---|---|---|---|
| <Standard Message Header> | Y | MsgType = c | |||||
| 320 | SecurityReqID | @ReqID | Y | ||||
| 321 | SecurityRequestType | @ReqTyp | Y | ||||
| 1301 | MarketID | @MktID | N | Identifies the market for which the security definition request is being made. | |||
| 1300 | MarketSegmentID | @MktSegID | N | Identifies the segment of the market for which the security definition request is being made. | |||
| <Instrument> | N | Insert here the set of "Instrument" fields defined in "Common Components of Application Messages". | |||||
| <InstrumentExtension> | N | Insert here the set of "InstrumentExtension" fields defined in "Common Components of Application Messages". | |||||
| 711 | NoUnderlyings | Undly | N | Number of underlyings | |||
| => | <UnderlyingInstrument> | C | Must be provided if Number of underlyings > 0 | ||||
| 15 | Currency | @Ccy | N | ||||
| 58 | Text | @Txt | N | Comment, instructions, or other identifying information. | |||
| 354 | EncodedTextLen | @EncTxtLen | C | Must be set if EncodedText (355) field is specified and must immediately precede it. | |||
| 355 | EncodedText | @EncTxt | C | Encoded (non-ASCII characters) representation of the Text (58) field in the encoded format specified via the MessageEncoding (347) field. | |||
| 336 | TradingSessionID | @SesID | 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 | @SesSub | N | ||||
| 555 | NoLegs | Leg | N | Number of legs. Identifies a Multi-leg Execution if present and non-zero. | |||
| => | <InstrumentLeg> | C | Must be provided if Number of legs > 0 | ||||
| 827 | ExpirationCycle | @ExpirationCycle | N | ||||
| 263 | SubscriptionRequestType | @SubReqTyp | N | Subscribe or unsubscribe for security status to security specified in request. | |||
| <Standard Message Trailer> | Y | ||||||
© 2026.
EPAM Systems. All Rights Reserved.
All material contained within the website is copyright of EPAM Systems, Inc. No material contained herein can be copied or otherwise used without the express permission of the copyright holder.