| NXL | | Electromedical & Electrotherapeutic Apparatus | 1527352 |
| NXN | | - | 885731 |
| NXNT | | Services-Prepackaged Software | 1976663 |
| NXP | | - | 883618 |
| NXPI | | Semiconductors & Related Devices | 1413447 |
| NXPL | | Telephone Communications (No Radiotelephone) | 1058307 |
| NXRT | | Real Estate Investment Trusts | 1620393 |
| NXST | | Television Broadcasting Stations | 1142417 |
| NXT | | Search, Detection, Navigation, Guidance, Aeronautical Sys | 1852131 |
| NXTC | | Pharmaceutical Preparations | 1661059 |
| NXTT | | Services-Computer Processing & Data Preparation | 1784970 |
| NXUR | | Truck & Bus Bodies | 1722969 |
| NXXT | | Retail-Auto Dealers & Gasoline Stations | 1817004 |
| NYAE | | Services-Business Services, NEC | 2087280 |
| NYAX | | Services-Prepackaged Software | 1901279 |
| NYC | | Real Estate Investment Trusts | 1595527 |
| NYMXF | | In Vitro & In Vivo Diagnostic Substances | 1018735 |
| NYT | | Newspapers: Publishing or Publishing & Printing | 71691 |
| NYXH | | Surgical & Medical Instruments & Apparatus | 1857190 |
| NZAUF | | - | 1925511 |
| NZERF | | - | 1509705 |
| NZF | | - | 1137887 |
| O | | Real Estate Investment Trusts | 726728 |
| OABI | | Services-Commercial Physical & Biological Research | 1846253 |
| OACC | | Blank Checks | 2029769 |
| OAK | | Investment Advice | 1403528 |
| OAKU | | Services-Misc Health & Allied Services, NEC | 1945422 |
| OAKV | | National Commercial Banks | 1865429 |
| OBA | | Blank Checks | 2034313 |
| OBDC | | - | 1655888 |
| OBE | | Crude Petroleum & Natural Gas | 1334388 |
| OBIO | | Surgical & Medical Instruments & Apparatus | 1814114 |
| OBK | | State Commercial Banks | 1516912 |
| OBLG | | Services-Computer Programming, Data Processing, Etc. | 746210 |
| OBNB | | - | 1916101 |
| OBOCY | | - | 2094691 |
| OBT | | State Commercial Banks | 1754226 |
| OBTC | | Commodity Contracts Brokers & Dealers | 1767057 |
| OC | | Abrasive, Asbestos & Misc Nonmetallic Mineral Prods | 1370946 |
| OCC | | Drawing & Insulating of Nonferrous Wire | 1000230 |
| OCCI | | - | 1716951 |
| OCEA | | Pharmaceutical Preparations | 1869974 |
| OCFC | | National Commercial Banks | 1004702 |
| OCG | | Services-Miscellaneous Business Services | 1776067 |
| OCGN | | Biological Products, (No Diagnostic Substances) | 1372299 |
| OCGSF | | Metal Mining | 942149 |
| OCLN | | Special Industry Machinery, NEC | 1419793 |
| OCS | | Pharmaceutical Preparations | 1953530 |
| OCSL | | - | 1414932 |
| OCUL | | Pharmaceutical Preparations | 1393434 |