| TOPCON LIMITED | Private company limited by shares | Dissolved |
| TOPCON LIMITED | Private company limited by shares | Live |
| TOPCON LIMITED | | Live |
| TOPCON (ASIA) LIMITED | Private company limited by shares | Live |
| TOPCON ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| TOPCON ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| TOPCON INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| TOPCON INVESTMENTS LIMITED | Private company limited by shares | Live |
| Topconn Technology Hong Kong Co., Limited | Private company limited by shares | Live |
| TOPCONN INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |