| ONEI INTERNATIONAL GROUP (HK) LIMITED | Private company limited by shares | Live |
| ONEIDA LIMITED | Private company limited by shares | Live |
| ONEIGHT ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| ONEIGHTY LIMITED | Private company limited by shares | Live |
| OneiHealth Company Limited | Private company limited by shares | Live |
| JON O'NEIL LIMITED | Private company limited by shares | Dissolved |
| O'NEILL ASSOCIATES LIMITED | Private company limited by shares | Dissolved |
| O'NEILL ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| One-Ing Investment Management Co., Limited | Private company limited by shares | Live |
| ONEINK LIMITED | Private company limited by shares | Live |
| oneinzero Limited | Private company limited by shares | Live |
| ONEIRO COMPANY LIMITED | Private company limited by shares | Live |
| Oneiro HK Limited | Private company limited by shares | Live |
| ONEIROS LIMITED | Private company limited by shares | Live |