| NION LIMITED | Private company limited by shares | Dissolved |
| NION CO., LIMITED | Private company limited by shares | Live |
| Yau Wou Nion Engineering Company Limited | Private company limited by shares | Live |
| NION TECHNOLOGY (HK) CO., LIMITED | Private company limited by shares | Live |
| NION ELECTRONIC INDUSTRIES COMPANY LIMITED | Private company limited by shares | Dissolved |
| Nion Technology Limited | Private company limited by shares | Dissolved |
| Niona Trade Limited | Private company limited by shares | Live |
| NIONNI LIMITED | Private company limited by shares | Dissolved |