| Tag | Field Name | Req'd | Comments |
|---|---|---|---|
| Standard Header | Y | MsgType = z (lowercase Z) | |
| 320 | SecurityReqID | Y | |
| 559 | SecurityListRequestType | Y | |
| Component block <UnderlyingInstrument> | N | Specifies the underlying instrument | |
| 15 | Currency | N | |
| 58 | Text | N | Comment, instructions, or other identifying information. |
| 354 | EncodedTextLen | N | Must be set if EncodedText field is specified and must immediately precede it. |
| 355 | EncodedText | N | Encoded (non-ASCII characters) representation of the Text field in the encoded format specified via the MessageEncoding field. |
| 336 | TradingSessionID | 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 | N | |
| 263 | SubscriptionRequestType | N | Subscribe or unsubscribe for security status to security specified in request. |
| Standard Trailer | Y | ||