| Abbreviation | Definition |
|---|---|
| NOLB | Novarferon Laboratories |
| NOLD | Noland Company |
| NOMF.PA | Normai, Inc. |
| NOMR | Noble Metal Recovery |
| NOMW.PK | NoMatterWare, Inc. |
| NOMX | NorMexSteel, Inc. |
| NOOF | New Frontier Media, Inc. |
| NOPT | Northeast Optic Network, Inc. |
| NORE | Noram Gaming and Entertainment, Inc. |
| NORPF | Nord Pacific, LTD. |
| NORPF | Nord Pacific, LTD. (de-listed) |
| NORPF | Nord Pacific, LTD. (de-listed) |
| NORPY | Nord Pacific, LTD. |
| NORPY | Nord Pacific, LTD. (de-listed) |
| NORPY | Nord Pacific, LTD. (de-listed) |
| NORSA | North State Telecom Corporation Class A |
| NORSA | North State Telecommunications Corporation Class A |
| NORSB | North State Telecom Corporation Class B |
| NORSB | North State Telecommunications Corporation Class B |
| NORWP | Northwestern Corporation Preferred |