| 3C5B Limited | Private company limited by shares | Live |
| 3CAPTUS TECHNOLOGIES LIMITED | Private company limited by shares | Dissolved |
| 3CEMS Investment Management Limited | Private company limited by shares | Live |
| 3-CF LIMITED | Private company limited by shares | Dissolved |
| 3CForge Company Limited | | Live |
| 3ChemBio Limited | Private company limited by shares | Live |
| 3CHK Limited | Private company limited by shares | Live |
| 3Cinnolighting Limited | Private company limited by shares | Live |
| 3CLED INDUSTRIAL (HONGKONG) LIMITED | Private company limited by shares | Live |
| 3-Colors Fine Technology (Hong Kong) Company Limited | Private company limited by shares | Live |
| 3COM ASIA LIMITED | Private company limited by shares | Live |
| 3COM CHINA LIMITED | Private company limited by shares | Dissolved |
| 3COM ELECTRONICS CO., LIMITED | Private company limited by shares | Live |
| 3COMMA LIMITED | | Live |
| 3-CON ELECTRONICS LIMITED | Private company limited by shares | Live |
| 3CONNECTS LIMITED | Private company limited by shares | Dissolved |
| 3-CONS (HONG KONG) TRADING LIMITED | Private company limited by shares | Dissolved |
| 3COPTICS CO., LIMITED | Private company limited by shares | Live |
| 3CORNER LIMITED | Private company limited by shares | Dissolved |
| 3cott Limited | Private company limited by shares | Live |
| 3Creation Company Limited | Private company limited by shares | Live |
| 3Crew Limited | Private company limited by shares | Live |
| 3CS-DESIGN LIMITED | Private company limited by shares | Live |
| 3CSoft Technology and Consultant Limited | Private company limited by shares | Dissolved |