| Abbreviation | Definition |
|---|---|
| NTSC | National Technology Systems, Inc. (de-listed) |
| NTSE | 9278 Communications |
| NTSF | NetStaff, Inc. |
| NTSI | National Tire Services |
| NTSL | Netsolve Incorporated |
| NTST | NetSmart Technologies, Inc. |
| NTTI | Net/ Tech International, Inc. |
| NTVN | Netivation.Com, Inc. |
| NTVT | NET Voice Technologies Corporation |
| NTWD | Netword, Inc. |
| NTWK | Netsol International, Inc. |
| NTWKW | Netsol International, Inc. Warrants |
| NTWO | N2H2, Inc. |
| NTXA | National Tax Accounting |
| NTXN | Nichols TXEN Corporation |
| NTXY | Nettaxi, Inc. |
| NUCO | Nuco2, Inc. |
| NUEP | Net 1 U E P S Technology, Inc. |
| NUHC | Nu Horizons Electronics Corporation |
| NUKE | Rhombic Corporation |