| My Cardio Limited | Private company limited by shares | Live |
| Cardio Company Limited | | Live |
| Cardio Ray Healthcare Limited | Private company limited by shares | Live |
| NOVONT CARDIO (HONG KONG) LIMITED | Private company limited by shares | Live |
| ST. PAUL'S CARDIO - THORACIC CENTRE LIMITED | Private company limited by shares | Dissolved |
| Cardiofix Lifesciences Hong Kong Limited | | Live |
| MicroPort CardioFlow China Corp. Limited | Private company limited by shares | Live |
| CardioGuard AI Limited | | Live |
| CARDIOMED LIMITED | Private company limited by shares | Live |
| CARDIOMED INTERNATIONAL (HK) LIMITED | Private company limited by shares | Dissolved |
| CARDIOMEDICS LIMITED | Private company limited by shares | Dissolved |
| CARDIONOVUM HOLDING CO., LIMITED | Private company limited by shares | Live |
| CardioPoint Limited | | Live |
| CARDIOR JEWELLERY CO., LIMITED | Private company limited by shares | Live |
| CardioRegenesis Limited | Private company limited by shares | Live |
| Cardiorigin Limited | Private company limited by shares | Live |
| CARDIOS CONSTRUCTION CO. LIMITED | Private company limited by shares | Dissolved |
| Cardiotek HK Limited | | Live |