| OPEN WIN COMPANY LIMITED | Private company limited by shares | Dissolved |
| OPEN GEM LIMITED | Private company limited by shares | Dissolved |
| OPEN FLY LIMITED | Private company limited by shares | Live |
| OPEN ERA LIMITED | Private company limited by shares | Dissolved |
| OPEN COMPANY LIMITED | Private company limited by shares | Live |
| OPEN SKY LIMITED | Private company limited by shares | Dissolved |
| OPEN AIR HK LIMITED | Private company limited by shares | Dissolved |
| TOP OPEN LIMITED | Private company limited by shares | Dissolved |
| OPEN E CRY LIMITED | Private company limited by shares | Dissolved |
| OPEN UP COMPANY LIMITED | Private company limited by shares | Live |
| OPEN TOP LIMITED | Private company limited by shares | Dissolved |
| OPEN 18 LIMITED | Private company limited by shares | Dissolved |
| OPEN SKY LIMITED | Private company limited by shares | Live |
| ALL OPEN LIMITED | Private company limited by shares | Live |
| BIG OPEN LIMITED | Private company limited by shares | Dissolved |
| SKY OPEN LIMITED | Private company limited by shares | Live |
| TOP OPEN LIMITED | Private company limited by shares | Live |
| 2 OPEN LIMITED | Private company limited by shares | Dissolved |
| Open BIM Limited | Private company limited by shares | Live |
| SKY OPEN LIMITED | Private company limited by shares | Live |
| Open Law Limited | Private company limited by shares | Live |
| HK Open TV Company Limited | Private company limited by shares | Live |
| Open ML Limited | | Live |
| OPEN LIMITED | | Live |
| OPEN FAIRWAYS ASIA LIMITED | Private company limited by shares | Live |
| MARKET OPEN (ASIA) LIMITED | Private company limited by shares | Dissolved |
| MARKET OPEN ASIA LIMITED | Private company limited by shares | Live |
| Asia Open Trade Limited | Private company limited by shares | Dissolved |
| BEST OPEN COMPANY LIMITED | Private company limited by shares | Dissolved |
| HK BLUESKY OPEN PARADISE CO., LIMITED | Private company limited by shares | Live |
| Open Brackets Limited | Private company limited by shares | Live |
| OPEN BUSINESS LIMITED | Private company limited by shares | Live |
| OPEN FOR BUSINESS COMPANY LIMITED | Private company limited by shares | Live |
| OPEN UP BUSINESS CO. LIMITED | | Live |
| Open 4 Business Online Limited | Private company limited by shares | Dissolved |
| Open Capital Limited | Private company limited by shares | Live |
| CENTRAL OPEN LIMITED | Private company limited by shares | Live |
| OPEN CENTRE COMPANY LIMITED | Private company limited by shares | Dissolved |
| CHINA OPEN LIMITED | Private company limited by shares | Dissolved |
| China Open net Limited | Private company limited by shares | Dissolved |
| CHINA OPEN LIMITED | Private company limited by shares | Live |
| CHINA OPEN CLOUD HOLDING GROUP COMPANY LIMITED | Private company limited by shares | Live |
| CHINA OPEN INVESTMENT GROUP LIMITED | | Live |
| OPEN CHOICE LIMITED | Private company limited by shares | Live |
| OPEN COMEX LIMITED | Private company limited by shares | Dissolved |
| OPEN CREATIVE LIMITED | Private company limited by shares | Live |
| Open Sky Enterprise Limited | Private company limited by shares | Live |
| EVER OPEN COMPANY LIMITED | Private company limited by shares | Dissolved |
| HK OPEN FAIR ENTERPRISE LIMITED | Private company limited by shares | Dissolved |
| OPEN FAIR ENTERPRISES LIMITED | Private company limited by shares | Live |
| OPEN FAIRWAYS APAC LIMITED | Private company limited by shares | Live |
| FAST OPEN LIMITED | Private company limited by shares | Live |
| GOLD OPEN FINANCE COMPANY LIMITED | Private company limited by shares | Dissolved |
| Open Forest Limited | Private company limited by shares | Live |
| OPEN FREE LIMITED | Private company limited by shares | Dissolved |
| OPEN GAIN COMPANY LIMITED | Private company limited by shares | Dissolved |
| OPEN GAIN LIMITED | Private company limited by shares | Live |
| OPEN GLORY LIMITED | Private company limited by shares | Live |
| GOLD OPEN LIMITED | Private company limited by shares | Dissolved |
| OPEN GRACE LIMITED | Private company limited by shares | Live |
| GRAND OPEN LIMITED | Private company limited by shares | Dissolved |
| GRAND OPEN LIMITED | Private company limited by shares | Live |
| OPEN GRAND LIMITED | Private company limited by shares | Dissolved |
| OPEN HARBOUR COMPANY LIMITED | Private company limited by shares | Dissolved |
| Help You Open Branch Limited | Private company limited by shares | Live |
| OPEN HIGHWAY LIMITED | Private company limited by shares | Live Commenced dormancy on 17-Nov-2015 |
| OPEN HILL INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| OPEN AI HOLDING LIMITED | | Live |
| Digital Open Holding Limited | Private company limited by shares | Live |
| China Open (Hong Kong) Limited | | Live |
| ITALY OPEN DE INTERNATIONAL INDUSTRIAL CO., LIMITED | Private company limited by shares | Dissolved |
| OPEN INTEGRATION CO. LIMITED | Private company limited by shares | Live |
| BEST OPEN INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| GOLD OPEN INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| OPEN RESOURCES INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| Open Space Investment Limited | Private company limited by shares | Live |
| OPEN TRADE INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| OPEN VIEW INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| OPEN INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| OPEN BUSINESS INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| Join Open (Asia) Limited | Private company limited by shares | Live |
| OPEN KITCHEN LIMITED | Private company limited by shares | Live |
| Open Knowledge Association Limited | Company limited by guarantee | Live |
| LEAD OPEN LIMITED | Private company limited by shares | Dissolved |
| Open Box Learning Centre Limited | Private company limited by shares | Live |
| LINK OPEN LIMITED | Private company limited by shares | Live |
| OPEN LINKAGE LIMITED | Private company limited by shares | Dissolved |
| OPEN LINKAGE LIMITED | Private company limited by shares | Live |
| OPEN LUCK LIMITED | Private company limited by shares | Dissolved |
| OPEN LUCK LIMITED | Private company limited by shares | Live |
| OPEN MARKET LIMITED | Private company limited by shares | Dissolved |
| OPEN MARKET LIMITED | Private company limited by shares | Dissolved |
| Open Market Limited | Private company limited by shares | Live |
| Use Your Mind Open Up New Road Limited | Private company limited by shares | Live |
| Open Mineral HK Limited | | Live |
| OPEN MONGOLIA LIMITED | Private company limited by shares | Live |
| OPEN MOROUS LIMITED | Private company limited by shares | Dissolved |
| OPEN NETWORK LIMITED | Private company limited by shares | Dissolved |
| OPEN NETWORK COMPANY LIMITED | Private company limited by shares | Live |
| OPEN OPTION LIMITED | Private company limited by shares | Dissolved |