| S.D.I. LIMITED | Private company limited by shares | Dissolved |
| S&DI Limited | Private company limited by shares | Live |
| SDIAMOND ELECTRONICS CORPORATION LIMITED | Private company limited by shares | Live |
| SDIBAO (CHINA) LIMITED | Private company limited by shares | Dissolved |
| SDILAN INDUSTRIAL PRODUCTS CO., LIMITED | Private company limited by shares | Dissolved |
| SDIOR INTERNATIONAL CO., LIMITED | Private company limited by shares | Dissolved |
| SDIPTHOUGHTS LIMITED | Private company limited by shares | Live |
| SDISEMI LIMITED | Private company limited by shares | Live |
| SDIU LIMITED | Private company limited by shares | Live |