| SKM | | Radiotelephone Communications | 1015650 |
| SKT | | Real Estate Investment Trusts | 899715 |
| SKVI | | Pharmaceutical Preparations | 1085277 |
| SKWD | | Fire, Marine & Casualty Insurance | 1519449 |
| SKY | | Mobile Homes | 90896 |
| SKYE | | Pharmaceutical Preparations | 1516551 |
| SKYH | | Real Estate | 1823587 |
| SKYI | | Services-Management Services | 1555017 |
| SKYQ | | Hazardous Waste Management | 1812447 |
| SKYT | | Semiconductors & Related Devices | 1819974 |
| SKYW | | Air Transportation, Scheduled | 793733 |
| SKYX | | Electric Lighting & Wiring Equipment | 1598981 |
| SLAB | | Semiconductors & Related Devices | 1038074 |
| SLAI | | Finance Services | 1517496 |
| SLAMF | | Communications Services, NEC | 1838162 |
| SLB | | Oil & Gas Field Services, NEC | 87347 |
| SLBK | | State Commercial Banks | 1657642 |
| SLDB | | Biological Products, (No Diagnostic Substances) | 1707502 |
| SLDC | | Telephone Communications (No Radiotelephone) | 1427644 |
| SLDE | | Fire, Marine & Casualty Insurance | 1886428 |
| SLDP | | Miscellaneous Electrical Machinery, Equipment & Supplies | 1844862 |
| SLE | | Services-Computer Integrated Systems Design | 1621672 |
| SLF | | Life Insurance | 1097362 |
| SLG | | Real Estate Investment Trusts | 1040971 |
| SLGB | | Arrangement of Transportation of Freight & Cargo | 1987189 |
| SLGL | | Pharmaceutical Preparations | 1684693 |
| SLGN | | Metal Cans | 849869 |
| SLI | | Chemicals & Allied Products | 1537137 |
| SLM | | Personal Credit Institutions | 1032033 |
| SLMT | | Services-Amusement & Recreation Services | 1939965 |
| SLN | | Pharmaceutical Preparations | 1479615 |
| SLND | | Heavy Construction Other Than Bldg Const - Contractors | 1883814 |
| SLNG | | Natural Gas Distribution | 1043186 |
| SLNH | | Finance Services | 64463 |
| SLNO | | Pharmaceutical Preparations | 1484565 |
| SLP | | Services-Computer Integrated Systems Design | 1023459 |
| SLQT | | Insurance Agents, Brokers & Service | 1794783 |
| SLRC | | - | 1418076 |
| SLRX | | Pharmaceutical Preparations | 1615219 |
| SLS | | Pharmaceutical Preparations | 1390478 |
| SLSN | | Perfumes, Cosmetics & Other Toilet Preparations | 883107 |
| SLSR | | Gold and Silver Ores | 2019103 |
| SLTN | | Rubber & Plastics Footwear | 1508786 |
| SLV | | Commodity Contracts Brokers & Dealers | 1330568 |
| SLVM | | Paper Mills | 1856485 |
| SLXN | | Biological Products, (No Diagnostic Substances) | 2022416 |
| SM | | Crude Petroleum & Natural Gas | 893538 |
| SMA | | Real Estate Investment Trusts | 1585389 |
| SMBC | | Savings Institutions, Not Federally Chartered | 916907 |
| SMBK | | National Commercial Banks | 1038773 |