| Abbreviation | Definition |
|---|---|
| SECY | Shanecy, Inc. |
| SECY | Shanecy, Incorporated (de-listed) |
| SECY | Shanecy, Incorporated (de-listed) |
| SEDG | Solaredge Technologies Inc |
| SEEC | S E E C, Inc. |
| SEEC | SEEC, Incorporated (de-listed) |
| SEEC | SEEC, Incorporated (de-listed) |
| SEFFF | S T E F International Corporation |
| SEFFF | STEF International Corporation (de-listed) |
| SEFFF | STEF International Corporation (de-listed) |
| SEGNY | Sega Enterprises, LTD. |
| SEGU | Segue Software, Inc. |
| SEHGE | Site Holdings, Inc. |
| SEHI | Southern Energy Homes, Inc. |
| SEIC | S E I Investment Corporation |
| SELB | Sel Leb Marketing, Inc. |
| SELYW | Sealy Corporation |
| SEMEE | Semicon, Inc. |
| SEMI | All American Semiconductor, Inc. |
| SEMOE | Semco Instrument, Inc. |