| SONTEC LIMITED | Private company limited by shares | Live |
| Sontec Global Limited | Private company limited by shares | Dissolved |
| SONTEC INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| SonTEC System Company Limited | Private company limited by shares | Dissolved |
| SONTEC TECHNOLOGY COMPANY LIMITED | Private company limited by shares | Live |
| SONTECH LIMITED | Private company limited by shares | Dissolved |
| SONTECH GROUP LIMITED | Private company limited by shares | Live |
| SONTECH TRADING LIMITED | Private company limited by shares | Live |