| TOPTEC INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| TOPTECH CO. LIMITED | Private company limited by shares | Live |
| TOPTECH INC LIMITED | Private company limited by shares | Live |
| TOPTECH ENTERPRISES COMPANY LIMITED | Private company limited by shares | Dissolved |
| Top-tech Enterprises Limited | Private company limited by shares | Live |
| TOPTECHES INDUSTRIAL (H.K.) LIMITED | Private company limited by shares | Live |
| TOPTECHNO LIMITED | Private company limited by shares | Live |
| Toptechone Oil Products (Hong Kong) Limited | Private company limited by shares | Live |
| TOPTECHPCB LIMITED | Private company limited by shares | Live |
| TOPTECHS CO., LIMITED | Private company limited by shares | Live |
| TOPTECK-OCEANIC GROUP LIMITED | Private company limited by shares | Live |
| TOPTECO LINK LIMITED | | Live |