| H.Y.S Hi-Tech Investment Limited | | Live |
| HYSAE LIMITED | Private company limited by shares | Live |
| SHENZHEN HYSAM TECHNOLOGY LIMITED | Private company limited by shares | Live |
| Hysamkey Technology Limited | Private company limited by shares | Live |
| HYSAN COMPANY LIMITED | Private company limited by shares | Dissolved |
| Hysan Company Limited | Private company limited by shares | Live |
| HYSAN AVENUE PROPERTIES COMPANY LIMITED | Private company limited by shares | Dissolved |
| 33 Hysan Avenue Tenant Limited | Private company limited by shares | Live |
| BFF BURGER'S FRIEND FOREVER (HYSAN) LIMITED | | Live |
| HYSAN DEVELOPMENT COMPANY LIMITED | Public company limited by shares | Live |
| Hysan Technology Bio-Medical Development (HK) Limited | | Live |
| Hysan Engineer Limited | | Live |
| HYSAN ENGINEERING LIMITED | Private company limited by shares | Live |
| HYSAN ENTERPRISES LIMITED | Private company limited by shares | Live |
| LEE HYSAN ESTATE COMPANY, LIMITED | Private company limited by shares | Live |
| LEE HYSAN ESTATE COMPANY, LIMITED | Private company limited by shares | Live Commenced dormancy on 06-Sep-2018 |
| HYSAN FINANCE LIMITED | Private company limited by shares | Dissolved |
| LEE HYSAN FOUNDATION | Company limited by guarantee | Live |
| Hysan Investment (Fund) Limited | Private company limited by shares | Live |
| HYSAN GROUP LIMITED | Private company limited by shares | Dissolved |
| HYSAN HOLDING LIMITED | Private company limited by shares | Dissolved |
| Hysan (Hong Kong) Technology Limited | Private company limited by shares | Live |
| HYSAN INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| HYSAN LEASING COMPANY LIMITED | Private company limited by shares | Live |
| Hysan Max Management Limited | Private company limited by shares | Live |
| Hysan (China) Asset Management Limited | | Live |
| HYSAN PROPERTY MANAGEMENT LIMITED | Private company limited by shares | Live |
| HYSAN MARKETING SERVICES LIMITED | Private company limited by shares | Live |
| HYSAN TRADING MEDICINE LIMITED | Private company limited by shares | Live |
| HYSAN PHARMACEUTICAL COMPANY LIMITED | Private company limited by shares | Live |
| HYSAN PROJECT MANAGEMENT (PRC) LIMITED | Private company limited by shares | Dissolved |
| SUN CHIU KEE (HYSAN ROAD) COMPANY LIMITED | Private company limited by shares | Dissolved |
| HYSAN CORPORATE SERVICES LIMITED | Private company limited by shares | Live |
| HYSAN COMPANY SECRETARIAL SERVICES LIMITED | Private company limited by shares | Live |
| HYSAN TECHNOLOGY LIMITED | | Live |
| HYSAN TRADING COMPANY LIMITED | Private company limited by shares | Dissolved |
| Hysan & Van Trading Limited | Private company limited by shares | Live |
| HYSAN TREASURY LIMITED | Private company limited by shares | Live |
| HYSCM GROUP CO., LIMITED | Private company limited by shares | Live |
| HYSCOBANX COMPANY LIMITED | Private company limited by shares | Live |
| HYSD INTERNATIONAL TRADE LIMITED | | Live |
| HYSE COMPANY LIMITED | Private company limited by shares | Dissolved |
| HYSE INTERNATIONAL TRADE CO., LIMITED | Private company limited by shares | Live |
| HYSEM LIMITED | Private company limited by shares | Live |
| HySemi (Hong Kong) Co., Limited | Private company limited by shares | Live |
| Xiamen Hysen Import & Export Co., Limited | Private company limited by shares | Live |
| Hysense trade company Limited | | Live |
| HYSENT INTERNATIONAL (CHINA) LIMITED | Private company limited by shares | Live |
| HYSEN-TECH LIMITED | Private company limited by shares | Live |
| HYSHARE CO., LIMITED | Private company limited by shares | Live |
| HYSHOW LIMITED | | Live |
| HYSICO TECHNOLOGY CO., LIMITED | Private company limited by shares | Dissolved |
| Hysin Trading Co., Limited | Private company limited by shares | Live |
| HYSIN (HK) INTERNATIONAL SHIPPING LIMITED | Private company limited by shares | Live |
| HYSINA LIMITED | Private company limited by shares | Dissolved |
| Hyskoa Shipping Company Limited | Private company limited by shares | Live |
| HYSKY LIMITED | Private company limited by shares | Dissolved |
| HONGKONG HYSL INDUSTRY CO., LIMITED | | Live |
| HYSLOP COMPANY LIMITED | Private company limited by shares | Dissolved |
| HYSOC Limited | Private company limited by shares | Live |
| HYSOCK COMPANY LIMITED | Private company limited by shares | Dissolved |
| HYSON LIMITED | Private company limited by shares | Dissolved |
| HYSON LIMITED | Private company limited by shares | Live |
| CHINA HYSONG INTERNATIONAL LIMITED | Private company limited by shares | Live |
| NINGBO HYSOUND ELECTRONIC CO., LIMITED | Private company limited by shares | Live |
| Hysound International Hearing (HongKong) Co., Limited | Private company limited by shares | Live |
| HYSPAS COMPANY LIMITED | Private company limited by shares | Live |
| HYSSAN TECHNOLOGY COMPANY LIMITED | Private company limited by shares | Live |
| HONGKONG HYST TRADING CO., LIMITED | Private company limited by shares | Live |
| HYSTERESIS LIMITED | Private company limited by shares | Live |
| HYSTER-PATRICK HO COMPANY LIMITED | Private company limited by shares | Dissolved |
| Hyston Mechanical Industry Co., Limited | Private company limited by shares | Dissolved |
| HYSTON INTERNATIONAL TRADE CO., LIMITED | Private company limited by shares | Live |
| Hystream Industrial Limited | | Live |
| HY-SUN Biomedical Limited | Private company limited by shares | Live |
| HYSUN ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| Hysyl Limited | Private company limited by shares | Dissolved |