| 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 |