| HYDRA LIMITED | Private company limited by shares | Dissolved |
| Hydra Limited | Private company limited by shares | Live |
| HYDRA COMPANY LIMITED | Private company limited by shares | Live |
| Hydra Advisors Limited | Private company limited by shares | Live |
| HYDRA BIOTECH LIMITED | Private company limited by shares | Live |
| HYDRA IMP & EXP CO., (H.K.) LIMITED | Private company limited by shares | Live |
| Hydra Concept Group Limited | Private company limited by shares | Live |
| HYDRA CONSULTING LIMITED | Private company limited by shares | Live |
| Hydra Corp. Limited | Private company limited by shares | Live |
| Hydra Corporation Limited | Private company limited by shares | Dissolved |
| Hydra Game Limited | Private company limited by shares | Live |
| HYDRA GROUP LIMITED | Private company limited by shares | Live |
| Hydra (HK) Limited | Private company limited by shares | Dissolved |
| Hydra Biotech (HK) Limited | | Live |
| HYDRA MERCANTILE HONG KONG LIMITED | Private company limited by shares | Dissolved |
| HYDRA TECH HONG KONG, LIMITED | Private company limited by shares | Live |
| HYDRA HOUSE LIMITED | Private company limited by shares | Dissolved |
| HYDRA INDUSTRIAL LIMITED | Private company limited by shares | Live |
| HYDRA INDUSTRIAL INVESTMENT LIMITED | Private company limited by shares | Live |
| Hydra International Limited | Private company limited by shares | Dissolved |
| Hydra Internet Limited | Private company limited by shares | Live |
| HYDRA INVEST LIMITED | Private company limited by shares | Live |
| HYDRA JEWELLERY COMPANY LIMITED | Private company limited by shares | Dissolved |
| Hydra Talent Management Systems Limited | Private company limited by shares | Live |
| Hydra Manila Limited | Private company limited by shares | Live |
| Hydra & Co. Asia Pacific Limited | Private company limited by shares | Live |
| HYDRA QUEST INTERNATIONAL LIMITED | Private company limited by shares | Live |
| HYDRA RESOURCES LIMITED | Private company limited by shares | Dissolved |
| Hydra Shipping Company Limited | Private company limited by shares | Dissolved |
| HYDRA SPORTS LIMITED | Private company limited by shares | Dissolved |
| HK Hydra Culture Sports Limited | Private company limited by shares | Live |
| ACC HYDRA TECH LIMITED | Private company limited by shares | Live |
| Hydra Technology Limited | Private company limited by shares | Live |
| HYDRA TECHNOLOGY INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| HYDRA TITAN ASIA (HK) LIMITED | Private company limited by shares | Dissolved |
| HYDRA WORLD TRADE LIMITED | Private company limited by shares | Live |
| HYDRA GENERAL TRADING LIMITED | | Live |
| HYDRA WORKSHOP LIMITED | Private company limited by shares | Live |
| HYDRABEND (ASIA PACIFIC) LIMITED | Private company limited by shares | Dissolved |
| HYDRACOM INTERACTIVE LIMITED | Private company limited by shares | Live |
| Hong Kong Hydracore Group Development Limited | Private company limited by shares | Live |
| Hydradeli International Limited | Private company limited by shares | Live |
| HYDRAGON LIMITED | Private company limited by shares | Dissolved |
| HYDRAGON LIMITED | Private company limited by shares | Live |
| HYDRAMOTION LIMITED | Private company limited by shares | Live |
| HYDRANGEA MP LIMITED | Private company limited by shares | Live |
| B&M HYDRANGEA LIMITED | Private company limited by shares | Live |
| HYDRANGEA LIMITED | Private company limited by shares | Live |
| HYDRANGEA 81 LIMITED | | Live |
| AHHA Hydrangea I LIMITED | | Live |
| Hydrangea Capital Management Limited | | Live |
| Hydrangea Medical Limited | | Live |
| Hydrangea Trading Limited | Private company limited by shares | Live |
| HYDRANGER ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| Hydrapak Limited | Private company limited by shares | Live |
| HYDRAQUIP (ASIA) LIMITED | Private company limited by shares | Dissolved |
| HYDRAS COMPANY LIMITED | Private company limited by shares | Live |
| HYDRAS CONSULTANTS LIMITED | Private company limited by shares | Live |
| HYDRAS INVESTMENT COMPANY LIMITED | Private company limited by shares | Dissolved |
| Hydrated Skin Beauty Company Limited | | Live |
| SPORTS HYDRATION CO., LIMITED | Private company limited by shares | Dissolved |
| JW HYDRAULIC LIMITED | Private company limited by shares | Live |
| E. N. Hydraulic Limited | Private company limited by shares | Live |
| HKG HYDRAULIC LIMITED | Private company limited by shares | Live |
| GXG Hydraulic Limited | Private company limited by shares | Live |
| CARSUN Hydraulic Solutions Co. Limited | | Live |
| CP Hydraulic Mechanical Company Limited | Private company limited by shares | Live |
| Space Hydraulic Co Limited | Private company limited by shares | Live |
| STM Hydraulics Limited | Private company limited by shares | Live |
| ANWEEL HYDRAULICS CO., LIMITED | Private company limited by shares | Live |
| HUNGER HYDRAULICS (ASIA) LIMITED | Private company limited by shares | Live |
| DENISON HYDRAULICS LIMITED | Private company limited by shares | Live |
| Doyle Pacific Hydraulics Limited | Private company limited by shares | Live |
| ANDA HYDRAULICS HONG KONG LIMITED | Private company limited by shares | Dissolved |
| HALDEX HYDRAULICS (HONG KONG) COMPANY LIMITED | Private company limited by shares | Dissolved |
| KM-HT Automation & Hydraulics Company Limited | Private company limited by shares | Live |
| LINDER HYDRAULICS LIMITED | Private company limited by shares | Live |
| PH HYDRAULICS & MACHINERY (F.E.) LIMITED | Private company limited by shares | Dissolved |
| HYDRAULICS SOLUTIONS LIMITED | Private company limited by shares | Live |
| STAR-UNION HYDRAULICS LIMITED | Private company limited by shares | Live |
| YEOSHE HYDRAULICS LIMITED | Private company limited by shares | Live |
| HYDRAULUX ASIA COMPANY LIMITED | Private company limited by shares | Live |
| HYDRAULX HK LIMITED | Private company limited by shares | Live |