| Abbreviation | Definition |
|---|---|
| SEMX | Semiconductor Packaging Materials Company |
| SENEA | Seneca Foods Corporation Class A |
| SENEB | Seneca Foods Corporation Class B |
| SENI | Sentinel Security Life Insurance Company |
| SENO | Senesco Technologies |
| SENR | Senior Care Industries |
| SENS | Sentex Sensing Technologies, Inc. |
| SEPPE | Septima Enterprises, Inc. |
| SEPR | Sepracor, Inc. |
| SEQS | Sequoia Systems, Inc. |
| SERC | Service Bancorp, Inc. |
| SERO | Serologicals Corporation |
| SESI | Superior Energy Services, Inc. |
| SESI | Superior Energy Services, Incorporated (de-listed) |
| SESI | Superior Energy Services, Incorporated (de-listed) |
| SESIW | Superior Energy Services, Inc. Warrants |
| SESIW | Superior Energy Services, Incorporated Warrants (de-listed) |
| SESIW | Superior Energy Services, Incorporated Warrants (de-listed) |
| SETCF | Setech, Inc. |
| SETHF | Sun Entertainment Holding Corporation |