| A | | Laboratory Analytical Instruments | 1090872 |
| AA | | Primary Production of Aluminum | 1675149 |
| AAAU | | Commodity Contracts Brokers & Dealers | 1708646 |
| AACB | | Blank Checks | 2034334 |
| AACG | | Services-Educational Services | 1420529 |
| AAL | | Air Transportation, Scheduled | 6201 |
| AAM | | Blank Checks | 2012964 |
| AAME | | Life Insurance | 8177 |
| AAMI | | Investment Advice | 1748824 |
| AAOI | | Semiconductors & Related Devices | 1158114 |
| AAON | | Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip | 824142 |
| AAP | | Retail-Auto & Home Supply Stores | 1158449 |
| AAPG | | Pharmaceutical Preparations | 2023311 |
| AAPI | | Insurance Agents, Brokers & Service | 1134982 |
| AAPL | | Electronic Computers | 320193 |
| AAQL | | Services-Direct Mail Advertising Services | 1672571 |
| AARD | | Pharmaceutical Preparations | 1774857 |
| AAS | | Real Estate | 2010218 |
| AASP | | Retail-Miscellaneous Retail | 930245 |
| AAT | | Real Estate Investment Trusts | 1500217 |
| AATC | | Measuring & Controlling Devices, NEC | 943034 |
| AAUAF | | Metal Mining | 1015647 |
| AAUC | | - | 1993344 |
| AAWH | | Medicinal Chemicals & Botanical Products | 1756390 |
| AB | | Investment Advice | 825313 |
| ABAT | | Mining & Quarrying of Nonmetallic Minerals (No Fuels) | 1576873 |
| ABBV | | Pharmaceutical Preparations | 1551152 |
| ABCB | | State Commercial Banks | 351569 |
| ABCFF | | - | 1284237 |
| ABCL | | Pharmaceutical Preparations | 1703057 |
| ABCP | | Opeators of Nonresidential Buildings | 20639 |
| ABEO | | Pharmaceutical Preparations | 318306 |
| ABEV | | Beverages | 1565025 |
| ABG | | Retail-Auto Dealers & Gasoline Stations | 1144980 |
| ABIT | | Finance Services | 1095146 |
| ABL | | Investment Advice | 1814287 |
| ABLV | | Retail-Nonstore Retailers | 1957489 |
| ABLZF | | Switchgear & Switchboard Apparatus | 1091587 |
| ABM | | Services-To Dwellings & Other Buildings | 771497 |
| ABNB | | Services-To Dwellings & Other Buildings | 1559720 |
| ABOS | | Biological Products, (No Diagnostic Substances) | 1576885 |
| ABP | | Biological Products, (No Diagnostic Substances) | 1893219 |
| ABQQ | | Patent Owners & Lessors | 1605331 |
| ABR | | Real Estate Investment Trusts | 1253986 |
| ABSI | | Services-Commercial Physical & Biological Research | 1672688 |
| ABT | | Pharmaceutical Preparations | 1800 |
| ABTC | | Finance Services | 1755953 |
| ABTS | | Finance Services | 1864055 |
| ABUS | | Pharmaceutical Preparations | 1447028 |
| ABVC | | Pharmaceutical Preparations | 1173313 |