| Tag | Field Name | XML Name | Data Type | Union Datatype | Description | Added | Depr. | Enums from tag |
|---|---|---|---|---|---|---|---|---|
| 651 | UnderlyingLastPx | @UndLastPx | Price |
The calculated or traded price for the underlying instrument that corresponds to a derivative. Used for transactions that include the cash instrument and the derivative. | Added FIX.4.3 |
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