| Abbreviation | Definition |
|---|---|
| SOFK | South Florida Banking Corporation |
| SOFN | Softnet Systems, Inc. (delisted) |
| SOFT | Softech, Inc. |
| SOGAY | Sons of Gwalia, N. L. |
| SOHI | Sortis Holdings Inc. |
| SOHU | Sohu.com, Inc. |
| SOLOE | Solo Serve Corporation |
| SOLP | Solomon Page Group, LTD. |
| SOLR | Serengeti Eyewear, Inc. |
| SOLVD | Solv- Ex Corporation |
| SOMC | Southern Michigan Bancorp |
| SOMN | Somnus Medical Technologies, Inc. |
| SOMN | Somnus Medical Technologies, Incorporated (de-listed) |
| SOMN | Somnus Medical Technologies, Incorporated (de-listed) |
| SOMR | Somerset Group, Inc. |
| SOMR | Somerset Group, Incorporated (de-listed) |
| SOMR | Somerset Group, Incorporated (de-listed) |
| SOMT | Somerset Trust Company of Pennsylvania |
| SOMT | Somerset Trust Company of Pennsylvania (de-listed) |
| SOMT | Somerset Trust Company of Pennsylvania (de-listed) |