| ID | Name | Type |
|---|---|---|
| #13259 | Siegmar Muller | + |
| #13260 | Siegmar Wittig | + |
| #13261 | Siel UK Ltd | Z |
| #13262 | Sierra Charlie 04 | ? |
| #13263 | Sierra On-Line | Z |
| #13264 | Sift S.A. | Z |
| #17696 | Sight and Sound | A |
| #13265 | Siglo XX | Z |
| #13266 | Sigma Soft | Z |
| #13267 | Sigma Technical Press | Z |
| #13268 | Sigmasoft | P |
| #13269 | Signpoint Ltd | Z |
| #17697 | Signus 2 Computer Games | S |
| #13270 | Sijthof | ? |
| #13271 | Silas Software | Z |
| #13272 | Silhouette Software | Z |
| #13273 | Silica Shop | A |
| #13274 | Silicon Brains Software Ltd | Z |
| #17698 | Silicon City | A |
| #13275 | Silicon Games | Z |