| PROKEY LIMITED | Private company limited by shares | Dissolved |
| PROKEY DEVELOPMENT LIMITED | Private company limited by shares | Live |
| PROKEY ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| PROKEY GROUP LIMITED | Private company limited by shares | Live |
| PROKEY INDUSTRIES LIMITED | Private company limited by shares | Dissolved |
| PROKEY INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| PROKEY INTERNATIONAL CO., LIMITED | Private company limited by shares | Live |
| PROKEY INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| PRO-KEY LEARNING SERVICES LIMITED | Private company limited by shares | Live |