Reason Codes
The following is a list of all reason codes used by Cboe. These reason codes are used in a variety of contexts (order cancellations and order rejections). All reasons are not valid in all contexts. The reason code will be followed by free-form text. The specific text the system delivers may vary from the test listed below, to provide clarification of the reject reason. Cboe may add additional reason codes without notice. Members must gracefully ignore unknown values.
| Code | Description |
|---|---|
| A | Admin |
| C | Capacity undefined |
| D | Duplicate identifier (e.g., ClOrdID) |
| E | Size reduction due to SWP restatement |
| F | Failed to quote |
| H | Halted |
| I | Incorrect data center |
| J | Too late to cancel |
| K | Order rate threshold exceeded |
| L | Order would lock or cross NBBO |
| M | Order size exceeded |
| N | Ran out of liquidity to execute against |
| O | ClOrdID doesn't match a known order |
| P | Can't modify an order that is pending fill |
| Q | Waiting for first trade |
| R | Routing Unavailable |
| S | Short sale price violation |
| T | Fill would trade through the NBBO |
| U | User requested |
| V | Would wash |
| W | Add liquidity only order would remove |
| X | Order expired |
| Y | Symbol not supported |
| Z | Unforeseen reason |
| f | Risk management MPID or RiskGroupID level |
| m | Market access risk limit exceeded |
| o | Max open orders count exceeded |
| r | Reserve reload |
| s | Risk management symbol level |
| u | Limit Up Limit Down (LULD) |
| w | Would remove on unslide |
| x | Crossed market |
| y | Order received by Cboe during replay |
| z | Session end |