| NIVF | | Services-Misc Health & Allied Services, NEC | 1981662 |
| NIXX | | Services-Computer Programming Services | 1462223 |
| NJR | | Natural Gas Distribution | 356309 |
| NKE | | Rubber & Plastics Footwear | 320187 |
| NKGFF | | - | 1839154 |
| NKLAQ | | Motor Vehicles & Passenger Car Bodies | 1731289 |
| NKLR | | Fabricated Plate Work (Boiler Shops) | 2067627 |
| NKSH | | National Commercial Banks | 796534 |
| NKTR | | Pharmaceutical Preparations | 906709 |
| NKTX | | Pharmaceutical Preparations | 1787400 |
| NKX | | - | 1195738 |
| NL | | Industrial Inorganic Chemicals | 72162 |
| NLCP | | Real Estate Investment Trusts | 1854964 |
| NLOP | | Real Estate Investment Trusts | 1952976 |
| NLST | | Semiconductors & Related Devices | 1282631 |
| NLY | | Real Estate Investment Trusts | 1043219 |
| NMAI | | - | 1861115 |
| NMAX | | Television Broadcasting Stations | 2026478 |
| NMCO | | - | 1774342 |
| NMEX | | Gold and Silver Ores | 1415744 |
| NMFC | | - | 1496099 |
| NMG | | Miscellaneous Metal Ores | 1649752 |
| NMGX | | Coating, Engraving & Allied Services | 891417 |
| NMHI | | Farm Machinery & Equipment | 1947861 |
| NMI | | - | 830271 |
| NMIH | | Surety Insurance | 1547903 |
| NML | | - | 1562051 |
| NMM | | Deep Sea Foreign Transportation of Freight | 1415921 |
| NMP | | Blank Checks | 2054876 |
| NMR | | Security Brokers, Dealers & Flotation Companies | 1163653 |
| NMRA | | Biological Products, (No Diagnostic Substances) | 1885522 |
| NMRK | | Real Estate Agents & Managers (For Others) | 1690680 |
| NMS | | - | 1607997 |
| NMT | | - | 897419 |
| NMTC | | Surgical & Medical Instruments & Apparatus | 1500198 |
| NMZ | | - | 1266585 |
| NN | | Search, Detection, Navigation, Guidance, Aeronautical Sys | 1865631 |
| NNAX | | Services-Management Services | 1132509 |
| NNBR | | Metalworkg Machinery & Equipment | 918541 |
| NNDM | | Printed Circuit Boards | 1643303 |
| NNE | | Electric Services | 1923891 |
| NNI | | Personal Credit Institutions | 1258602 |
| NNN | | Real Estate Investment Trusts | 751364 |
| NNNN | | In Vitro & In Vivo Diagnostic Substances | 1982708 |
| NNOX | | X-Ray Apparatus & Tubes & Related Irradiation Apparatus | 1795251 |
| NNUP | | Games, Toys & Children's Vehicles (No Dolls & Bicycles) | 888981 |
| NNVC | | Pharmaceutical Preparations | 1379006 |
| NNY | | - | 818850 |
| NOA | | Oil & Gas Field Services, NEC | 1368519 |
| NOAH | | Investment Advice | 1499543 |
