| Abbreviation | Definition |
|---|---|
| SETO | Seto Holdings, Inc. |
| SEVJE | Seven J Stock Farm, Inc. |
| SEVN | Sevenson Environmental Services, Inc. |
| SEVT | Summit Environmental, Inc. |
| SEVU | Seaview Underwater Research |
| SEWY | Seaway Food Town, Inc. |
| SEWY | Seaway Food Town, Incorporated (de-listed) |
| SEWY | Seaway Food Town, Incorporated (de-listed) |
| SEXI | Systems of Excellence, Inc. |
| SEXI | Systems of Excellence, Incorporated (de-listed) |
| SEXI | Systems of Excellence, Incorporated (de-listed) |
| SEYE | Signature Eyewear, Inc. |
| SEYE | Signature Eyewear, Incorporated (de-listed) |
| SEYE | Signature Eyewear, Incorporated (de-listed) |
| SFAD | Safe Tech International, Inc. |
| SFAD | Safe Tech International, Incorporated (de-listed) |
| SFAD | Safe Tech International, Incorporated (de-listed) |
| SFAM | SpeedFam IPEC, Inc. |
| SFAM | SpeedFam IPEC, Incorporated (de-listed) |
| SFAM | SpeedFam IPEC, Incorporated (de-listed) |