| HK VISTER INSTRUMENTS LIMITED | Private company limited by shares | Live |
| WATTS OPTICAL INSTRUMENTS LIMITED | Private company limited by shares | Live |
| WELLFORM OPTICAL INSTRUMENTS COMPANY LIMITED | Private company limited by shares | Dissolved |
| WELLS INSTRUMENTS (H.K.) LIMITED | Private company limited by shares | Live |
| WILSON INSTRUMENTS (HONGKONG) CO., LIMITED | Private company limited by shares | Live |
| WINGS INSTRUMENTS COMPANY LIMITED | Private company limited by shares | Live |
| HK WINKING MUSICAL INSTRUMENTS CO., LIMITED | Private company limited by shares | Live |
| Win-Win Instruments Limited | | Live |
| VAN GOGH (WRITING INSTRUMENTS) COMPANY LIMITED | Private company limited by shares | Live |
| WYLDAR PRECISION INSTRUMENTS LIMITED | Private company limited by shares | Live |
| SHANGHAI XUJI INSTRUMENTS CO., LIMITED | Private company limited by shares | Live |
| Yinghao Scientific Instruments & Materials Limited | | Live |
| YORK INSTRUMENTS INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| York Instruments International Limited | Private company limited by shares | Live |
| Yuwo Instruments and Equipments Limited | Private company limited by shares | Live |
| ZAMAX INSTRUMENTS COMPANY LIMITED | Private company limited by shares | Dissolved |
| ZEPPELIN INSTRUMENTS ASIA LIMITED | Private company limited by shares | Live |