| SILENT JOY LIMITED | | Live |
| SILENT HILL LIMITED | Private company limited by shares | Dissolved |
| SILENT OCEAN LIMITED | Private company limited by shares | Live |
| Silent Solutions Limited | Private company limited by shares | Live |
| Silent Wave Limited -The- | Private company limited by shares | Live |
| SILENTGATE NETWORKS LIMITED | | Live |
| Silentium (Asia) Limited | Private company limited by shares | Live |
| Silentmode Limited | Private company limited by shares | Live |
| SILENTNIGHT LIMITED | | Live |
| SilentSense Limited | Private company limited by shares | Dissolved |