| SEMCO SIM LIMITED | Private company limited by shares | Live |
| SEMCO ELECTRIC CO. LIMITED | Private company limited by shares | Live |
| SEMCO ELECTRONICS LIMITED | Private company limited by shares | Dissolved |
| SEMCO INVESTMENT LIMITED | Private company limited by shares | Live |
| SEMCO PLASTICS LIMITED | Private company limited by shares | Dissolved |
| SEMCO TRADING LIMITED | Private company limited by shares | Dissolved |
| SEMCON LIMITED | Private company limited by shares | Live |
| SEMCONTEK LIMITED | Private company limited by shares | Live |
| SEMCOR COMPANY LIMITED | Private company limited by shares | Dissolved |
| SEMCOR CORP LIMITED | Private company limited by shares | Live |
| Semcorea International Limited | Private company limited by shares | Dissolved |
| SEMCOS LIMITED | Private company limited by shares | Live |