| Abbreviation | Definition |
|---|---|
| NCR | N C R Corporation |
| NCS | NCI Building Systems, Inc. |
| NCX | Nova Chemicals Corporation |
| NCXP | Nova Chemical Corporation Preferred |
| NCXPA | Nova Chemicals Corporation Preferred A |
| NDB | National Disk Brokers Group |
| NDC | National Data Corporation (delisted) |
| NDC | NDCHealth Corporation |
| NDE | Indymac Marketing Holdings, Inc. |
| NDN | 99 Cents Only Stores |
| NE | Noble Drilling Corporation |
| NEB | New England Business Services, Inc. |
| NEE | NextEra Energy |
| NEG | Energy East Corporation |
| NEM | Newmont MIning Corporation |
| NES | New England Electric Systems |
| NET | North European Oil Realty Trust |
| NEU | Neuberger Berman, Inc. |
| NEV | Nuevo Energy Company |
| NEVPT | Nuevo Financing I |