| PROTRON LIMITED | Private company limited by shares | Dissolved |
| PROTROND LIMITED | Private company limited by shares | Dissolved |
| PROTRONIC LIMITED | Private company limited by shares | Live |
| PROTRONIC HK LIMITED | Private company limited by shares | Dissolved |
| PROTRONIC ASIA LIMITED | Private company limited by shares | Live |
| PROTRONIC ELECTRONICS LIMITED | Private company limited by shares | Live |
| PROTRONIC TECHNOLOGY (HONG KONG) LIMITED | Private company limited by shares | Live |
| PRO-TRONIC INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| PROTRONIC INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| NEWFINE PROTRONIC LIMITED | Private company limited by shares | Dissolved |
| PROTRONIC PRODUCTS LIMITED | Private company limited by shares | Dissolved |
| PROTRONIC COMMUNICATION SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| PROTRONIC TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| PROTRONIC TECHNOLOGY LIMITED | Private company limited by shares | Live |
| PROTRONICS COMPANY LIMITED | Private company limited by shares | Live |
| PROTRONICS INDUSTRIAL CO., LIMITED | Private company limited by shares | Live |
| PROTRONICS INTERNATIONAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| PROTRONICS INTERNATIONAL LIMITED | Private company limited by shares | Live |
| PROTRONICS TECHNOLOGIES COMPANY LIMITED | Private company limited by shares | Dissolved |
| PROTRONICS TECHNOLOGY (SHENZHEN) LIMITED | Private company limited by shares | Live |
| PRO-TRONIX LIMITED | Private company limited by shares | Dissolved |