| NRUC | | Miscellaneous Business Credit Institution | 70502 |
| NRXP | | Pharmaceutical Preparations | 1719406 |
| NRXS | | Electromedical & Electrotherapeutic Apparatus | 1933567 |
| NSA | | Real Estate Investment Trusts | 1618563 |
| NSARO | | Electric Services | 13372 |
| NSC | | Railroads, Line-Haul Operating | 702165 |
| NSFDF | | Oil & Gas Field Exploration Services | 1009922 |
| NSIT | | Retail-Catalog & Mail-Order Houses | 932696 |
| NSP | | Services-Help Supply Services | 1000753 |
| NSPR | | Surgical & Medical Instruments & Apparatus | 1433607 |
| NSRX | | Pharmaceutical Preparations | 2029039 |
| NSSC | | Communications Equipment, NEC | 69633 |
| NSTM | | Retail-Retail Stores, NEC | 912544 |
| NSTS | | Savings Institution, Federally Chartered | 1881592 |
| NSYS | | Electronic Components, NEC | 722313 |
| NTAP | | Computer Storage Devices | 1002047 |
| NTB | | Commercial Banks, NEC | 1653242 |
| NTCL | | Services-Prepackaged Software | 1927578 |
| NTCS | | Services-Computer Processing & Data Preparation | 1933359 |
| NTCT | | Services-Computer Integrated Systems Design | 1078075 |
| NTES | | Services-Prepackaged Software | 1110646 |
| NTGR | | Telephone & Telegraph Apparatus | 1122904 |
| NTHI | | Pharmaceutical Preparations | 1979414 |
| NTIC | | Coating, Engraving & Allied Services | 875582 |
| NTIP | | Patent Owners & Lessors | 1065078 |
| NTLA | | In Vitro & In Vivo Diagnostic Substances | 1652130 |
| NTNX | | Services-Prepackaged Software | 1618732 |
| NTPIF | | Real Estate | 829365 |
| NTR | | Agricultural Chemicals | 1725964 |
| NTRA | | Services-Medical Laboratories | 1604821 |
| NTRB | | Orthopedic, Prosthetic & Surgical Appliances & Supplies | 1676047 |
| NTRP | | Transportation Services | 788611 |
| NTRS | | State Commercial Banks | 73124 |
| NTRX | | Retail-Furniture Stores | 1363598 |
| NTSK | | Services-Prepackaged Software | 2063196 |
| NTST | | Real Estate Investment Trusts | 1798100 |
| NTWK | | Services-Prepackaged Software | 1039280 |
| NTWO | | Blank Checks | 2028027 |
| NTZ | | Household Furniture | 900391 |
| NU | | Finance Services | 1691493 |
| NUAI | | Crude Petroleum & Natural Gas | 2028336 |
| NUE | | Steel Works, Blast Furnaces & Rolling Mills (Coke Ovens) | 73309 |
| NUGN | | Services-Prepackaged Software | 1593549 |
| NUKK | | Services-Management Consulting Services | 1787518 |
| NUMD | | Surgical & Medical Instruments & Apparatus | 1543637 |
| NUS | | Wholesale-Drugs, Proprietaries & Druggists' Sundries | 1021561 |
| NUTR | | Transportation Services | 2006468 |
| NUTX | | Services-Business Services, NEC | 1479681 |
| NUV | | - | 812801 |
| NUVB | | Pharmaceutical Preparations | 1811063 |
