# Nasdaq CXC Enumerations

Nasdaq CXC is Nasdaq’s dark pool ATS that allows participants to execute orders anonymously at or better than the NBBO without displaying quotes.

The following fields have Enumerations:

* AGGRESSOR_SIDE - Indicates whether a trade resulted from an incoming buy or sell order.
* BOOK_TYPE - Type of order book or trading mechanism through which a trade was executed.
* BYPASS - Identifies whether the trade resulted from a Bypass order
* MKT_PHASE - Indicates the instrument’s current market phase, as specified by the trading venue
* ODD_LOT - Indicates whether a trade was an odd lot
* ORDER_TYPE - Type of order.
* SPECIAL_TERMS - Indicates any non-standard settlement / execution terms associated with a trade
* TRADE_PERIOD - Market period during which a trade was executed.
* TRADE_TYPE - Type of trade
* UPDATE_TYPE - Type of update

#### AGGRESSOR_SIDE - Enumeration

| Enumeration ID   | Enumeration Description                          |
|------------------|--------------------------------------------------|
| ‘””’             | Undefined (e.g. off-book trades, auction trades) |
| B                | Buy                                              |
| S                | Sell                                             |

#### BOOK_TYPE - Enumeration

|   Enumeration ID | Enumeration Description   |
|------------------|---------------------------|
|                0 | Lit order book            |
|                1 | Off-book                  |
|                3 | Odd lot book              |
|                4 | Special terms book        |

#### BYPASS - Enumeration

| Enumeration ID   | Enumeration Description   |
|------------------|---------------------------|
| ‘””’             | Not a bypass trade        |
| Y                | Bypass trade              |

#### MKT_PHASE - Enumeration

| Enumeration ID   | Enumeration Description                  |
|------------------|------------------------------------------|
| C                | End of transmission                      |
| E                | End of system hours                      |
| H                | Halted                                   |
| M                | End of market hours                      |
| O                | Start of messages                        |
| Q                | Start of market hours                    |
| R                | Resume after market-wide circuit breaker |
| S                | Start of system hours                    |
| T                | Trading                                  |
| W                | Market-wide circuit breaker              |

#### ODD_LOT - Enumeration

| Enumeration ID   | Enumeration Description   |
|------------------|---------------------------|
| ‘””’             | Board lot                 |
| Y                | Odd lot                   |

#### ORDER_TYPE - Enumeration

| Enumeration ID   | Enumeration Description   |
|------------------|---------------------------|
| L                | Limit order               |
| M                | Market order              |

#### SPECIAL_TERMS - Enumeration

| Enumeration ID   | Enumeration Description                |
|------------------|----------------------------------------|
| ‘””’             | No special terms (standard settlement) |
| CT               | Cash today                             |
| DD               | Delayed delivery                       |
| ND               | Next day                               |

#### TRADE_PERIOD - Enumeration

| Enumeration ID   | Enumeration Description           |
|------------------|-----------------------------------|
| -                | Regular trading                   |
| C                | Closing auction (Market on close) |

#### TRADE_TYPE - Enumeration

| Enumeration ID   | Enumeration Description                    |
|------------------|--------------------------------------------|
| ‘””’             | Regular trade                              |
| B                | Basis cross                                |
| C                | Contingent cross                           |
| D                | Derivative-related cross                   |
| H                | Hidden order execution                     |
| I                | Internal cross                             |
| N                | NAV cross                                  |
| L                | M-ELO (Midpoint Extended Life Order) trade |
| V                | VWAP cross                                 |
| X                | Intentional cross                          |

#### UPDATE_TYPE - Enumeration

| Enumeration ID   | Enumeration Description   |
|------------------|---------------------------|
| A                | Add                       |
| D                | Delete                    |
| F                | Fill                      |
| M                | Modify                    |
| P                | Partial fill              |