| One.A. Accessories Limited | Private company limited by shares | Live |
| OneA Consultancy Limited | Private company limited by shares | Live |
| ONE-A MEDIA (H.K.) LIMITED | Private company limited by shares | Dissolved |
| ONE-A PROPERTY (H.K.) LIMITED | Private company limited by shares | Dissolved |
| ONE-ACE 8 LIMITED | Private company limited by shares | Live |
| OneAD Limited | Private company limited by shares | Live |
| Oneadds Technology Limited | | Live |
| ONEADS NETWORK LIMITED | Private company limited by shares | Live |
| ONEAFTER ASSOCIATES LIMITED | Private company limited by shares | Live |
| ONEAIM LIMITED | | Live |
| O'NEAL LIMITED | Private company limited by shares | Live |
| ONEALL ADDITIVES LIMITED | Private company limited by shares | Live |
| Oneallsports Limited | Private company limited by shares | Live |
| OneAPM Limited | Private company limited by shares | Live |
| ONEARTH LIMITED | Private company limited by shares | Live |
| OneAsia Limited | Company limited by guarantee | Live |
| OneAsia Network Limited | Private company limited by shares | Live |
| ONEASIA PACIFIC LIMITED | Private company limited by shares | Live |
| One-Asia Partners Limited | Private company limited by shares | Live |
| One-Asia HK P.E. Partners Limited | Private company limited by shares | Live |
| ONEASIA.COM (ASIA PACIFIC) LIMITED | Private company limited by shares | Dissolved |
| ONEASIAONE LIMITED | Private company limited by shares | Dissolved |
| OneAston HK Limited | Private company limited by shares | Live |
| OneAxcess Limited | Private company limited by shares | Live |