| Abbreviation | Definition |
|---|---|
| NRG | Markwest Hydrocarbon, Inc. |
| NSB | Salomon Smith Barney Holdings I |
| NSD | National Standard Company |
| NSO | NStor Technologies, Inc. |
| NTI | Northern Technologies International |
| NTN | NT N Communications, Inc. |
| NVR | NVR, Inc. |
| NVX | North American Vaccine, Inc. |
| NWD | New Dragon Asia Corporation |
| NWX | AMEX Networking Index |
| NYF | Nyfix, Inc. |
| NZ | New Mexico & Arizona Land Company |
| NZH | NUVEEN California Dividend Advisory Municipal Fund |
| NZX | NUVEEN Georgia Dividend Advisory Municipal Fund |
| OAR | Ohio Art Company |
| OHB | Orleans HomeBuilders, Inc. |
| OHCA | Oriole Homes Corporation Class A |
| OHCB | Oriole Homes Corporation Class B |
| OIH | Oil Service Holders Trust |
| OLP | One Liberty Properties, Inc. |