| AVR | | Orthopedic, Prosthetic & Surgical Appliances & Supplies | 2011514 |
| AVSBS | | Real Estate | 2032732 |
| AVT | | Wholesale-Electronic Parts & Equipment, NEC | 8858 |
| AVTR | | Laboratory Analytical Instruments | 1722482 |
| AVTX | | Pharmaceutical Preparations | 1534120 |
| AVVSY | | - | 2082141 |
| AVX | | Finance Services | 1826397 |
| AVXL | | Biological Products, (No Diagnostic Substances) | 1314052 |
| AVY | | Converted Paper & Paperboard Prods (No Contaners/Boxes) | 8818 |
| AWATY | | - | 2092258 |
| AWCA | | Opeators of Nonresidential Buildings | 1021917 |
| AWF | | - | 906013 |
| AWHL | | In Vitro & In Vivo Diagnostic Substances | 926617 |
| AWI | | Plastics Products, NEC | 7431 |
| AWK | | Water Supply | 1410636 |
| AWP | | - | 1390195 |
| AWR | | Water Supply | 1056903 |
| AWRE | | Services-Prepackaged Software | 1015739 |
| AWX | | Refuse Systems | 1061069 |
| AX | | Savings Institution, Federally Chartered | 1299709 |
| AXG | | Security Brokers, Dealers & Flotation Companies | 1959224 |
| AXGN | | Electromedical & Electrotherapeutic Apparatus | 805928 |
| AXIA | | Electric Services | 1439124 |
| AXIL | | Perfumes, Cosmetics & Other Toilet Preparations | 1718500 |
| AXIN | | Blank Checks | 2057030 |
| AXL | | Motor Vehicle Parts & Accessories | 1062231 |
| AXON | | Ordnance & Accessories, (No Vehicles/Guided Missiles) | 1069183 |
| AXP | | Finance Services | 4962 |
| AXR | | Land Subdividers & Developers (No Cemeteries) | 6207 |
| AXREF | | Gold and Silver Ores | 1175596 |
| AXS | | Fire, Marine & Casualty Insurance | 1214816 |
| AXSM | | Pharmaceutical Preparations | 1579428 |
| AXTA | | Paints, Varnishes, Lacquers, Enamels & Allied Prods | 1616862 |
| AXTI | | Semiconductors & Related Devices | 1051627 |
| AYI | | Electric Lighting & Wiring Equipment | 1144215 |
| AYR | | Services-Equipment Rental & Leasing, NEC | 1362988 |
| AYRWF | | Medicinal Chemicals & Botanical Products | 1847462 |
| AYTU | | Pharmaceutical Preparations | 1385818 |
| AZ | | General Industrial Machinery & Equipment, NEC | 1866030 |
| AZI | | Services-Automotive Repair, Services & Parking | 1959726 |
| AZN | | Pharmaceutical Preparations | 901832 |
| AZO | | Retail-Auto & Home Supply Stores | 866787 |
| AZTA | | Special Industry Machinery, NEC | 933974 |
| AZTR | | Pharmaceutical Preparations | 1701478 |
| AZULQ | | Air Transportation, Scheduled | 1432364 |
| AZZ | | Coating, Engraving & Allied Services | 8947 |
| AZZTF | | - | 1706404 |
| B | | Gold and Silver Ores | 756894 |
| BA | | Aircraft | 12927 |
| BABA | | Services-Business Services, NEC | 1577552 |
