| PROFICIENCY NET LIMITED | Private company limited by shares | Live |
| TOP PROFICIENCY COMPANY LIMITED | Private company limited by shares | Dissolved |
| PROFICIENCY LIMITED | Private company limited by shares | Dissolved |
| PROFICIENCY BUILDING CONSULTANTS COMPANY LIMITED | Private company limited by shares | Dissolved |
| PROFICIENCY BUILDING MATERIALS AND EQUIPMENT LIMITED | Private company limited by shares | Dissolved |
| PROFICIENCY INDUSTRIAL PRODUCTS (CHINA) LIMITED | Private company limited by shares | Live |
| HK Proficiency Consultancy Company Limited | Private company limited by shares | Live |
| PROFICIENCY ENGINEERING LIMITED | Private company limited by shares | Live |
| PROFICIENCY EQUIPMENT LIMITED | Private company limited by shares | Live |
| Headway Proficiency Limited | Private company limited by shares | Live |
| PROFICIENCY (HK) LIMITED | Private company limited by shares | Live |
| PROFICIENCY (HOLDING) LIMITED | Private company limited by shares | Dissolved |
| PROFICIENCY INDUSTRIAL PRODUCTS LIMITED | Private company limited by shares | Live |
| PROFICIENCY INVESTMENT COMPANY LIMITED | Private company limited by shares | Dissolved |
| PROFICIENCY LANGUAGE CENTRE LIMITED | Private company limited by shares | Dissolved |
| PROFICIENCY REALITY LIMITED | Private company limited by shares | Live |
| New Proficiency Machinery Rental Limited | | Live |
| Proficiency Engineering Services Limited | Private company limited by shares | Live |
| SOURCING PROFICIENCY LIMITED | Private company limited by shares | Dissolved |
| PROFICIENCY SURVEYORS COMPANY LIMITED | Private company limited by shares | Dissolved |
| PROFICIENCY SYKES ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| Proficiency Technology Enterprise Limited | | Live |