| KASTON LIMITED | Private company limited by shares | Live |
| KASTON ELECTRONICS LIMITED | Private company limited by shares | Live |
| KASTON ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| USA KASTON OIL ENVIRONMENT PROTECTION SCI-TECH DEVELOP LIMITED | Private company limited by shares | Dissolved |
| KASTON (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| KASTON INDUSTRIAL CO., LIMITED | Private company limited by shares | Live |
| KASTON INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| KOREA KASTON PHOTOLOGY CO., LIMITED | Private company limited by shares | Live |
| KASTON PROPERTIES LIMITED | Private company limited by shares | Dissolved |
| KASTON TRADING LIMITED | Private company limited by shares | Dissolved |
| KASTONE LIMITED | Private company limited by shares | Live |
| Kastone Exhibition (Hong Kong) Co., Limited | | Live |