| 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 |
| OPEN PHOENIX COMPANY LIMITED | Private company limited by shares | Dissolved |
| OPEN PLAN COMPANY LIMITED | Private company limited by shares | Live |
| Open Playground Limited -The- | Private company limited by shares | Live |
| OPEN POWER COMPANY LIMITED | Private company limited by shares | Dissolved |
| PRAISE OPEN COMPANY LIMITED | Private company limited by shares | Dissolved |
| TOP OPEN PROPERTIES LIMITED | Private company limited by shares | Dissolved |
| OPEN CREATOR PROPERTIES LIMITED | Private company limited by shares | Dissolved |
| OPEN VIEW PROPERTIES LIMITED | Private company limited by shares | Dissolved |
| CHINA OPEN PROPERTY LIMITED | Private company limited by shares | Dissolved |
| OPEN PUBLISHING COMPANY LIMITED | Private company limited by shares | Dissolved |
| Just & Open Publishing Limited | Private company limited by shares | Live |
| OPEN RESOURCES ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| OPEN RICH LIMITED | Private company limited by shares | Dissolved |
| OPEN RICH LIMITED | Private company limited by shares | Dissolved |
| OPEN RICH LIMITED | Private company limited by shares | Live |
| Royal Asia Open Trade Limited | Private company limited by shares | Live |
| Open Saturdays Limited | Private company limited by shares | Live |
| Shin Open Investments Limited | Private company limited by shares | Live |
| Open Shoppes Limited | Private company limited by shares | Live |
| OPEN SIGHT LIMITED | Private company limited by shares | Live |
| OPEN SMART LIMITED | Private company limited by shares | Live |
| OPEN SOFTWARE LIMITED | Private company limited by shares | Dissolved |
| OPEN SOLUTION LIMITED | Private company limited by shares | Dissolved |
| Open IoT Solution Limited | | Live |
| OPEN SOLUTIONS LIMITED | Private company limited by shares | Dissolved |
| ADVANCED OPEN SOLUTIONS LIMITED | Private company limited by shares | Dissolved |
| OPEN SPACE LIMITED | Private company limited by shares | Live |
| OPEN STAGE LIMITED | Private company limited by shares | Dissolved |
| OPEN STREAM LIMITED | Private company limited by shares | Live |
| OPEN SUCCESS LIMITED | Private company limited by shares | Live |
| OPEN SYSTEM COMPANY LIMITED | Private company limited by shares | Dissolved |
| OPEN SYSTEMS LIMITED | Private company limited by shares | Live |
| OPEN SYSTEMS TODAY LIMITED | Private company limited by shares | Dissolved |
| TAKE OPEN LIMITED | Private company limited by shares | Dissolved |
| OPEN TARGET COMPANY LIMITED | Private company limited by shares | Dissolved |
| OPEN TEAM LIMITED | Private company limited by shares | Live |
| Open Terrace Limited | Private company limited by shares | Dissolved |
| OPEN TIME LIMITED | Private company limited by shares | Live |
| TRADE OPEN LIMITED | Private company limited by shares | Dissolved |
| EVER OPEN TRADING LIMITED | Private company limited by shares | Live |
| WEll OPEN SOURCE TRADING CO., LIMITED | Private company limited by shares | Live |
| Open View Limited | Private company limited by shares | Live |
| OPEN WEALTH LIMITED | Private company limited by shares | Dissolved |
| OPEN WEALTH LIMITED | Private company limited by shares | Live |
| OPEN WEALTH INVESTMENTS LIMITED | Private company limited by shares | Live |
| WELL OPEN LIMITED | Private company limited by shares | Live |
| OPEN 3 WINES LIMITED | Private company limited by shares | Live |
| WINNING OPEN LIMITED | | Live |
| WISE OPEN LIMITED | Private company limited by shares | Dissolved |
| OPEN WORTH INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| Open4ex Company Limited | Private company limited by shares | Live |
| OpenAds Media Limited | | Live |
| Openaicity Limited | | Live |
| OPENAIR LIMITED | Private company limited by shares | Dissolved |
| OpenAir Solutions Company Limited | Private company limited by shares | Live |
| OpenAirlines H.K. Limited | Private company limited by shares | Live |
| OPENANY TECHNOLOGY CO., LIMITED | Private company limited by shares | Dissolved |
| OPENASIA LIMITED | Private company limited by shares | Live |
| OMG OPENASIA LIMITED | Private company limited by shares | Live |
| OPENASIA CONSULTING LIMITED | Private company limited by shares | Live |
| OPENASIA GROUP LIMITED | Private company limited by shares | Live |
| OPENASICS LIMITED | Private company limited by shares | Dissolved |
| OPEN-AVL LIMITED | Private company limited by shares | Live |
| Openballs Limited | Private company limited by shares | Live |
| OpenBench Technology Limited | Private company limited by shares | Live |
| Openblack Limited | Private company limited by shares | Live |
| OPENBLUE LIMITED | Private company limited by shares | Dissolved |
| OPENBMCS LIMITED | Private company limited by shares | Live |
| OpenBorder Logistics Asia Limited | Private company limited by shares | Live |
| OPENBOT LIMITED | | Live |
| OPENBOX LIMITED | Private company limited by shares | Dissolved |
| OPENBOX LIMITED | Private company limited by shares | Dissolved |
| OpenBrain Limited | Private company limited by shares | Live |
| OPENBUY LIMITED | Private company limited by shares | Live |
| OPENCART LIMITED | Private company limited by shares | Live |
| OPENCART HOLDING LIMITED | Private company limited by shares | Live |
| OpenCertHub Limited | Private company limited by shares | Live |
| OpenCertHub Academy Limited | | Live |
| OpenCertHub DigiCredential Limited | | Live |
| OPENCHINA DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| OpenClass Limited | Private company limited by shares | Live |
| OPENCLASS (HK) LIMITED | | Live |
| OPENCLUB LIMITED | Private company limited by shares | Dissolved |
| OpenCollab Limited | Private company limited by shares | Live |