| O.P.I. LIMITED | Private company limited by shares | Dissolved |
| Opia Limited | | Live |
| OPIC LIMITED | Private company limited by shares | Live |
| OPICORE TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| OPIE COMPANY LIMITED | Private company limited by shares | Dissolved |
| OPIE DIAODING (CHINA) LIMITED | Private company limited by shares | Live |
| Opielok Asia (HK) Limited | Private company limited by shares | Live |
| OPIELOK SHIPPING COMPANY (HK) LIMITED -THE- | Private company limited by shares | Dissolved |
| OPIFICIO INTERNATIONAL CO., LIMITED | Private company limited by shares | Dissolved |
| OPIFICIO MODA LIMITED | Private company limited by shares | Live |
| Opihap Limited | | Live |
| Opiko Training & Counseling Network Limited | Private company limited by shares | Live |
| Hong Kong Opin Selection Trading Limited | Private company limited by shares | Live |
| Opine Limited | Private company limited by shares | Live |
| Chinese Public Opinion News Agency Limited | Private company limited by shares | Live |
| OPINION PUBLISHERS ( ASIA ) LIMITED | Private company limited by shares | Dissolved |
| Candid O'Pinion Limited | Private company limited by shares | Live |
| TA KUNG PUBLIC OPINION MONITORING CENTRE COMPANY LIMITED | Private company limited by shares | Live |
| PUBLIC OPINION REPRESENTATIVES CENTRE LIMITED | Private company limited by shares | Dissolved |
| Opinion Kiss Co., Limited | Private company limited by shares | Live |
| OPINION CONSULTANTS LIMITED | Private company limited by shares | Dissolved |
| PUBLIC OPINION CONSULTATION CENTRE LIMITED | Private company limited by shares | Dissolved |
| RICH OPINION TRADING DEVELOP LIMITED | Private company limited by shares | Live |
| OPINION ENTERPRISES COMPANY LIMITED | Private company limited by shares | Live |
| FAVOUR OPINION LIMITED | Private company limited by shares | Dissolved |
| A GENTLEMAN'S OPINION LIMITED | Private company limited by shares | Live |
| GOOD OPINION LIMITED | Private company limited by shares | Live |
| Opinion Prive (HK) Limited | Private company limited by shares | Live |
| Hong Kong People Opinion Company Limited | | Live |
| HONG KONG PUBLIC OPINION LIMITED | Private company limited by shares | Live |
| HONG KONG PUBLIC OPINION RESEARCH LIMITED | Private company limited by shares | Live |
| Opinion International Limited | | Live |
| OPINION NETWORK LIMITED | Private company limited by shares | Live |
| SECOND OPINION LIMITED | Private company limited by shares | Dissolved |
| SECOND OPINION LIMITED | Private company limited by shares | Dissolved |
| Star Opinion Leader Company Limited | Private company limited by shares | Live |
| Third Opinion Limited | | Live |
| United Opinion Sea Products International Limited | | Live |
| Opinionfact Research Limited | | Live |
| Opinionsbridge Marketing Research Co., Limited | Private company limited by shares | Live |
| OPIS LIMITED | Private company limited by shares | Dissolved |
| Opis Investments Limited | Private company limited by shares | Live |
| NEW OPITION LIMITED | Private company limited by shares | Live |
| OPITO LIMITED | Private company limited by shares | Dissolved |
| Opius Limited | Private company limited by shares | Live |
| Opize Limited | Private company limited by shares | Dissolved |