| O.co HK Limited | Private company limited by shares | Live |
| Ocode Media Company Limited | Private company limited by shares | Dissolved |
| Ocolour Technologies Co., Limited | Private company limited by shares | Live |
| OCOMA LIMITED | Private company limited by shares | Live |
| OCOMP LIMITED | Private company limited by shares | Dissolved |
| OCONCORD INDUSTRY CO., LIMITED | Private company limited by shares | Live |
| OCONEE LIMITED | Private company limited by shares | Dissolved |
| O-CONNECT LIMITED | Private company limited by shares | Live |
| Oconnect China Limited | Private company limited by shares | Live |
| JERRY O'CONNELL ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| OCONNSULT (HK) LIMITED | Private company limited by shares | Live |
| Ocontents (Hong Kong) Limited | Private company limited by shares | Live |
| OCONUS LIMITED | Private company limited by shares | Dissolved |
| OCOOL ACCESSORIS CO., LIMITED | Private company limited by shares | Live |
| OCOON TEX LIMITED | Private company limited by shares | Live |
| OCORA LIMITED | Private company limited by shares | Live |
| Ocorio Limited | | Live |
| OCOS Limited | Private company limited by shares | Live |
| OCOS SOFTWARE COMPANY LIMITED | Private company limited by shares | Live |
| HK OCOSTE LIMITED | Private company limited by shares | Live |
| OCOT LIMITED | Private company limited by shares | Live |
| OCOTAL INVESTMENT COMPANY LIMITED | Private company limited by shares | Dissolved |