| Seiko Instruments Trading (H.K.) Limited | Private company limited by shares | Live |
| TRILLION INSTRUMENTS SERVICE LIMITED | | Live |
| TRUWEL SCIENTIFIC INSTRUMENTS LIMITED | Private company limited by shares | Dissolved |
| TRUWEL SCIENTIFIC INSTRUMENTS LIMITED | Private company limited by shares | Live |
| Shanghai Tuyou Scientific Instruments Co., Limited | Private company limited by shares | Live |
| UNISEARCH INSTRUMENTS (CHINA) LIMITED | Private company limited by shares | Live |
| UNITED PRECISION INSTRUMENTS (1972) LIMITED | Private company limited by shares | Dissolved |
| UNITEK INSTRUMENTS LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL INSTRUMENTS LIMITED | Private company limited by shares | Live |
| UNIVERSAL SURVEYING INSTRUMENTS LIMITED | Private company limited by shares | Dissolved |
| UPCHINA (INSTRUMENTS) LIMITED | Private company limited by shares | Dissolved |
| USIDEAL INSTRUMENTS LIMITED | | Live |
| VEAZEN MUSICAL INSTRUMENTS LIMITED | | Live |
| VENTURA INSTRUMENTS LIMITED | Private company limited by shares | Dissolved |
| VIROBAN MEDICAL INSTRUMENTS LIMITED | Private company limited by shares | Live |
| 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 |
| INSTTECH (HONGKONG) LIMITED | Private company limited by shares | Live |
| ZHONGZHI FINANCE BUSINESS INSTTUTE OF CHINA LIMITED | Private company limited by shares | Live |
| Traditional Chinese And Western Medical Diabetes Instutute Limited | Private company limited by shares | Live |
| INSTYE GROUP LIMITED | Private company limited by shares | Live |
| Instyl Limited | Private company limited by shares | Live |
| INSTYLE LIMITED | Private company limited by shares | Dissolved |
| INSTYLE HK LIMITED | Private company limited by shares | Dissolved |
| SBI Instyle Limited | Private company limited by shares | Live |
| LTL INSTYLE LIMITED | Private company limited by shares | Live |
| Dinoer Instyle Company Limited | Private company limited by shares | Live |
| Toys Instyle Limited | Private company limited by shares | Live |
| TOUCHED INSTYLES LIMITED | Private company limited by shares | Live |