| Abbreviation | Definition |
|---|---|
| SSPI | Spectrum Signal Processing |
| SSPI | Spectrum Signal Processing (de-listed) |
| SSPI | Spectrum Signal Processing (de-listed) |
| SSPY | Sport Supply Group |
| SSRI | Silver Standard Resources, Inc. |
| SSRI | Silver Standard Resources, Incorporated (de-listed) |
| SSRI | Silver Standard Resources, Incorporated (de-listed) |
| SSRM | SSR Mining, Incorporated |
| SSSS | Steware & Stevenson Services |
| SSSW | SilverStream Software, Inc. |
| SSTI | Silicon Storage Technologies, Inc. |
| SSTR | Silverstar Holdings, Ltd. |
| SSUG | Sterling Sugars, Inc. |
| SSXX | SmartSources.Com, Inc. |
| SSYS | StrataSys, Inc. |
| STAA | Staar Surgical Company |
| STAC | Stac Software, Inc. |
| STAD | Student Advantage, Inc. |
| STAF | Staffmark, Inc. |
| STAI | Systems Technology Associates |