# The Nasdaq Enumerations

The Nasdaq is an American multinational financial services corporation that operates the world’s second-largest stock exchange by market capitalization

The following fields have Enumerations:

* AGGRESSOR_SIDE - Indicates whether a trade resulted from an incoming buy or sell order.
* TRADE_TYPE - Type of trade
* TRADE_TYPE_EXT - Extended trade type code
* ODD_LOT - Indicates whether a trade was an odd lot
* TRADE_PERIOD - Market period during which a trade was executed.
* BOOK_TYPE - Type of order book or trading mechanism through which a trade was executed.
* RPI - Indicates the presence of Retail Price Improvement interest on bid and/or ask side
* MKT_PHASE - Indicates the instrument’s current market phase, as specified by the trading venue
* REASON_CODE - Reason for an instrument status update
* SHORT_SALE_RESTRICTION - Indicates whether short selling is permitted
* PART_TYPE - Indicates the type of market participant identified by PART_ID
* FINANCIAL_STATUS - Indicates the regulatory status of a security or its issuer
* UPDATE_TYPE - Type of update
* ORDER_TYPE - Type of order.

#### AGGRESSOR_SIDE - Enumeration

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

#### TRADE_TYPE - Enumeration

| Enumeration ID   | Enumeration Description                |
|------------------|----------------------------------------|
| ‘””’             | Regular trade                          |
| A                | Auction trade                          |
| H                | Regular trade against hidden liquidity |

#### TRADE_TYPE_EXT - Enumeration

| Enumeration ID   | Enumeration Description      |
|------------------|------------------------------|
| ‘””’             | Unspecified [for future use] |

#### ODD_LOT - Enumeration

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

#### TRADE_PERIOD - Enumeration

| Enumeration ID   | Enumeration Description              |
|------------------|--------------------------------------|
| -                | Regular trading                      |
| C                | Closing auction                      |
| E                | Extended hours (Early session)       |
| L                | Extended hours (Late session)        |
| O                | Opening auction                      |
| P                | Public offering / buyback auction    |
| U                | Unscheduled auction                  |
| u                | Unscheduled auction (extended hours) |

#### BOOK_TYPE - Enumeration

|   Enumeration ID | Enumeration Description   |
|------------------|---------------------------|
|                0 | Lit order book            |

#### RPI - Enumeration

| Enumeration ID   | Enumeration Description   |
|------------------|---------------------------|
| ‘””’             | No retail interest        |

#### MKT_PHASE - Enumeration

| Enumeration ID   | Enumeration Description   |
|------------------|---------------------------|
| C                | End of day                |
| E                | End of system hours       |
| H                | Halted                    |
| O                | Start of day              |
| P                | LULD pause                |
| Q                | Quote only                |
| T                | Trading                   |

#### REASON_CODE - Enumeration

| Enumeration ID   | Enumeration Description                                                     |
|------------------|-----------------------------------------------------------------------------|
| ‘””’             | Unspecified                                                                 |
| A                | Anticipated quotation release time for IPO                                  |
| C                | IPO release cancelled / postponed                                           |
| C3               | Issuer news not forthcoming, quotation / trading to resume                  |
| C4               | Listing requirements met, quotation / trading to resume                     |
| C9               | Filings met, quotation / trading to resume                                  |
| C11              | Halt concluded by other regulatory authority, quotation / trading to resume |
| H4               | Non-compliance with listing requirements                                    |
| H9               | Filings not current                                                         |
| H10              | SEC trading suspension                                                      |
| H11              | Regulatory concern                                                          |
| IPO1             | IPO issue not yet trading                                                   |
| IPOE             | Positioning window extension for IPO security                               |
| IPOQ             | IPO security released for quotation                                         |
| LUDP             | Volatility trading pause                                                    |
| LUDS             | Volatility trading pause (straddle condition)                               |
| M1               | Corporate action                                                            |
| M2               | Quotation not available                                                     |
| MWC0             | Market-wide circuit breaker (MWCB) carried over from previous day           |
| MWC1             | MWCB level 1 breached                                                       |
| MWC2             | MWCB level 2 breached                                                       |
| MWC3             | MWCB level 3 breached                                                       |
| MWCQ             | MWCB resumption                                                             |
| O1               | Halted by Market Operations                                                 |
| R1               | New issue available                                                         |
| R2               | Issue available                                                             |
| R4               | Qualification issues reviewed / resolved, quotation / trading to resume     |
| R9               | Filing requirements satisfied / resolved, quotation / trading to resume     |
| T1               | News pending                                                                |
| T2               | News disseminated                                                           |
| T3               | News disseminated, quotation / trading to resume                            |
| T5               | Trading pause                                                               |
| T6               | Extraordinary market activity                                               |
| T7               | Quotation only period                                                       |
| T8               | ETF halt                                                                    |
| T12              | Information requested by Nasdaq                                             |

#### SHORT_SALE_RESTRICTION - Enumeration

| Enumeration ID   | Enumeration Description             |
|------------------|-------------------------------------|
| ‘””’             | Unspecified                         |
| 0                | No short selling restriction        |
| 1                | Short selling restriction in effect |

#### PART_TYPE - Enumeration

| Enumeration ID   | Enumeration Description   |
|------------------|---------------------------|
| L                | Penalty                   |
| N                | Normal                    |
| P                | Passive                   |
| R                | Pre-syndicate             |
| S                | Syndicate                 |

#### FINANCIAL_STATUS - Enumeration

| Enumeration ID   | Enumeration Description                |
|------------------|----------------------------------------|
| ‘””’             | Unspecified                            |
| C                | Creation / redemption suspended (ETPs) |
| D                | Deficient                              |
| E                | Delinquent                             |
| G                | Deficient + bankrupt                   |
| H                | Deficient + delinquent                 |
| J                | Delinquent + bankrupt                  |
| K                | Deficient + delinquent + bankrupt      |
| N                | Normal                                 |
| Q                | Bankrupt                               |
| S                | Suspended                              |

#### UPDATE_TYPE - Enumeration

| Enumeration ID   | Enumeration Description                                                                                         |
|------------------|-----------------------------------------------------------------------------------------------------------------|
| A                | Add                                                                                                             |
| D                | Delete                                                                                                          |
| F                | Fill                                                                                                            |
| M                | Modify                                                                                                          |
| N                | Fill (non-printable - does not appear in trade tickers as the execution is part of an aggregated auction print) |
| O                | Partial fill (non-printable)                                                                                    |
| P                | Partial fill                                                                                                    |

#### ORDER_TYPE - Enumeration

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