| COSIA MACHINERY & TOOLS COMPANY LIMITED | Private company limited by shares | Dissolved |
| Global COSIC Immigration Consultant Limited | Private company limited by shares | Live |
| COSIDA LIMITED | Private company limited by shares | Dissolved |
| COSILIBO TECH CO. LIMITED | Private company limited by shares | Live |
| COSIM LIMITED | Private company limited by shares | Dissolved |
| Cosima Sports Company Limited | Private company limited by shares | Live |
| Cosimo Industrial Corporation Limited | Private company limited by shares | Live |
| COSIMO INTERNATIONAL ENTERPRISE LIMITED | Private company limited by shares | Dissolved |
| COSIMO (WB) CAPITAL LIMITED | Private company limited by shares | Live |
| COSIMODE LIMITED | Private company limited by shares | Live |
| COSIMODEGROUP LIMITED | Private company limited by shares | Live |
| COSIN LIMITED | Private company limited by shares | Dissolved |
| COSINDA TRADING (HONG KONG) LIMITED | | Live |
| COSINE LIMITED | Private company limited by shares | Live |
| Cosine CPA Limited | Private company limited by shares | Live |
| Cosine Sports & Entertainment Co., Limited | | Live |
| COSINE ELECTRONIC PARTS LIMITED | Private company limited by shares | Dissolved |
| COSINE ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| HONG KONG SINE & COSINE CONSULTING LIMITED | Private company limited by shares | Live |
| COSINE PUBLICATION COMPANY LIMITED | Private company limited by shares | Dissolved |
| Cosing Tech Co., Limited | Private company limited by shares | Live |
| COSING TRADING LIMITED | | Live |
| COSINGWA COMPANY LIMITED | Private company limited by shares | Dissolved |
| COSINO COMPANY LIMITED | Private company limited by shares | Dissolved |
| COSINO INVESTMENT LIMITED | Private company limited by shares | Live Ceased dormancy on 22-Feb-2011 |
| COSINUS COMPANY LIMITED | Private company limited by shares | Live |
| NINGBO COSION TRADE CO., LIMITED | Private company limited by shares | Live |
| Cosis Ecommerce Limited | Private company limited by shares | Live |
| COSISTAT LIMITED | Private company limited by shares | Dissolved |
| COSITA LIMITED | Private company limited by shares | Live |