| RADIUM COMPANY, LIMITED | Private company limited by shares | Dissolved |
| RADIUM RAY LIMITED | Private company limited by shares | Live |
| Radium Atoms Limited | Private company limited by shares | Live |
| Radium Electronics Co., Limited | Private company limited by shares | Live |
| RADIUM CREATION LIMITED | Private company limited by shares | Live |
| Radium Engineering Company Limited | Private company limited by shares | Live |
| RADIUM GAMES LIMITED | Private company limited by shares | Live |
| RADIUM (HONG KONG) LIMITED | Private company limited by shares | Dissolved |