# London Metal Exchange Enumerations

The London Metal Exchange (LME) is the world’s largest market for trading base metals futures and options.

The following fields have Enumerations:

* MMT_MKT_MECH - Market mechanism through which a trade was executed.
* MMT_MOD_IND - Identifies trade cancellations, or amendments of a previous trade.
* MMT_PRICE_FORMING_IND - Identifies whether a trade is price-forming, or contributes to the price discovery process.
* MMT_TRD_MODE - Trading period during which an on-book trade was executed, or origin of an off-book trade report (on-exchange / off-exchange / SI).
* TRADE_TYPE - Type of trade

#### MMT_MKT_MECH - Enumeration

|   Enumeration ID | Enumeration Description   |
|------------------|---------------------------|
|                1 | Central Limit Order Book  |
|                4 | Off Book                  |

#### MMT_MOD_IND - Enumeration

| Enumeration ID   | Enumeration Description   |
|------------------|---------------------------|
| -                | New trade                 |
| C                | Trade cancellation        |

#### MMT_PRICE_FORMING_IND - Enumeration

| Enumeration ID   | Enumeration Description             |
|------------------|-------------------------------------|
| P                | Plain vanilla (price-forming) trade |

#### MMT_TRD_MODE - Enumeration

|   Enumeration ID | Enumeration Description       |
|------------------|-------------------------------|
|                2 | Continuous trading            |
|                5 | Trade reporting (on-exchange) |

#### TRADE_TYPE - Enumeration

| Enumeration ID   | Enumeration Description                                              |
|------------------|----------------------------------------------------------------------|
| 11               | Current market price trade (Exchange, non-Select) [until 20250321]   |
| 12               | Current market price trade (Client, non-Select) [until 20250321]     |
| 13               | Average or Amalgamated trade (Exchange, non-Select) [until 20250321] |
| 14               | Average or Amalgamated trade (Client, non-Select) [until 20250321]   |
| 15               | Client cross vs cleared Give-up [until 20250321]                     |
| 16               | Client cross vs late cleared Give-up [until 20250321]                |
| 2                | Electronic trade                                                     |
| 21               | Electronic trade (Exchange) [until 20250321]                         |
| 22               | Electronic trade (Client) [until 20250321]                           |
| 31               | Inter-office trade                                                   |
| 41               | 1st Ring matched trade                                               |
| 42               | 2nd Ring matched trade                                               |
| 43               | 3rd Ring matched trade                                               |
| 44               | 4th Ring matched trade                                               |
| 45               | Basis 1st Morning Ring                                               |
| 46               | Basis 2nd Morning Ring                                               |
| 47               | Basis 1st Afternoon Ring                                             |
| 48               | Basis 2nd Afternoon Ring                                             |
| 51               | 1st Kerb matched trade                                               |
| 52               | 2nd Kerb matched trade                                               |
| 53               | Basis Morning Kerb                                                   |
| 54               | Basis Afternoon Kerb                                                 |
| 6                | Implied trade                                                        |
| 61               | Exceptional Use trade (Exchange) [until 20250321]                    |
| 62               | Exceptional Use trade (Client) [until 20250321]                      |
| TC               | Trade at Close                                                       |