| COSEA LIMITED | Private company limited by shares | Dissolved |
| COSEBA LIMITED | Private company limited by shares | Dissolved |
| COSEC LIMITED | Private company limited by shares | Dissolved |
| CO-SEC ACCOUNTANCY LIMITED | Private company limited by shares | Live |
| Jordan Cosec (Hong Kong) Limited | Private company limited by shares | Live |
| CO-SEC NOMINEE LIMITED | Private company limited by shares | Live |
| COSEC PROPERTIES LIMITED | Private company limited by shares | Dissolved |
| COSEC SECRETARIAL LIMITED | Private company limited by shares | Live |
| COSECAI LIMITED | | Live |
| COSECHA COMPANY LIMITED | Private company limited by shares | Live |
| COSECOSY LIMITED | | Live |
| COSECRE LIMITED | Private company limited by shares | Dissolved |
| COSEE IMP & EXP CO., LIMITED | Private company limited by shares | Live |
| Cosef Limited | | Live |
| COSEKA COMPANY LIMITED | Private company limited by shares | Dissolved |
| COSEL ASIA LIMITED | Private company limited by shares | Live |
| CO-SELL LIMITED | Private company limited by shares | Dissolved |
| COSELLON TECHNOLOGY (HK) GROUP LIMITED | | Live |
| COSELMARINE LIMITED | Private company limited by shares | Dissolved |
| COSELOCEAN LIMITED | Private company limited by shares | Dissolved |
| COSELSALVAGE LIMITED | Private company limited by shares | Live |
| COSEM INTERNATIONAL(HONG KONG)CO., LIMITED | Private company limited by shares | Live |
| Cosemi Tech Limited | Private company limited by shares | Live |
| COSEN LIMITED | Private company limited by shares | Dissolved |
| COSEN LIMITED | Private company limited by shares | Live |
| COSEN (H.K.) ENTERPRISES COMPANY LIMITED | Private company limited by shares | Live |
| COSEN (HONG KONG) LIMITED | Private company limited by shares | Live |
| Cosen Intelligent (HK) CO., Limited | | Live |
| COSEN INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| COSEN TRADE LIMITED | | Live |
| Cosenbase Limited | Private company limited by shares | Live |
| COSENSES LIMITED | Private company limited by shares | Live |
| COSENTINO LIMITED | Private company limited by shares | Dissolved |
| Coser Uchu Limited | | Live |
| COSERS TRADE LIMITED | Private company limited by shares | Live |
| CO-SET INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| HK COSET TRADE LIMITED | Private company limited by shares | Live |
| COSETTE LIMITED | Private company limited by shares | Dissolved |
| COSETTE INVESTMENTS LIMITED | Private company limited by shares | Live |
| COSETTE HOUSEHOLD ITEMS INDUSTRIAL CO., LIMITED | Private company limited by shares | Live |
| CoseVision Limited | Private company limited by shares | Live |