| CALTEC ELECTRONICS COMPANY LIMITED | Private company limited by shares | Dissolved |
| CALTEC SHIPPING LIMITED | Private company limited by shares | Dissolved |
| CAL-TECH COMPANY LIMITED | Private company limited by shares | Dissolved |
| Caltech Limited | Private company limited by shares | Live |
| CALTECH GROUP LIMITED | Private company limited by shares | Live |
| CALTECH INVESTMENTS LIMITED | Private company limited by shares | Live |
| CALTECHE PETROCHEMICAL (HK) LIMITED | Private company limited by shares | Live |
| CALTECSON COMPANY LIMITED | | Live |
| Hong Kong Caltecson Trading Company Limited | | Live |