| Onlyemall Technology co., Limited | Private company limited by shares | Live |
| ONLYEST GROUP LIMITED | | Live |
| OnlyFace Limited | | Live |
| ONLY-FIRST TECHNOLOGY (INTERNATIONAL) CO., LIMITED | Private company limited by shares | Live |
| Onlyflyzone Universe Hongkong Limited | Private company limited by shares | Live |
| Onlygames Co., Limited | | Live |
| OnlyGames Global Entertainment Co., Limited | Private company limited by shares | Live |
| ONLYGEOTECHNICS LIMITED | Private company limited by shares | Live |
| OnlyGive Technology Co., Limited | | Live |
| Onlygood Co., Limited | Private company limited by shares | Live |
| ONLYGOT ENTERPRISE LIMITED | Private company limited by shares | Live |
| ONLYHERE LIMITED | Private company limited by shares | Live |
| ONLY-HITS LIMITED | Private company limited by shares | Live |
| ONLYLIGHT ENTERPRISES LIMITED | Private company limited by shares | Live |
| Onlylover HK Limited | Private company limited by shares | Live |
| ONLYMA TECHNOLOGIES CO., LIMITED | Private company limited by shares | Live |
| ONLYONE IMP AND EXP CO., LIMITED | Private company limited by shares | Live |
| ONLYONE GROUP (HONGKONG) CO., LIMITED | Private company limited by shares | Live |
| Onlyone (Hong Kong) Limited | | Live |
| ONLYONE INTERNATIONAL (HONGKONG) GROUP COMPANY LIMITED | Private company limited by shares | Live |
| HK Onlyone Industry Co., Limited | Private company limited by shares | Live |
| SHENZHEN ONLYONE LIGHT LIMITED | Private company limited by shares | Live |
| ONLYONE SOLUTION LIMITED | Private company limited by shares | Live |
| ONLYONE TECHNOLOGY CO., LIMITED | Private company limited by shares | Dissolved |
| HK ONLYONE INTERNATIONAL TRADE CO., LIMITED | Private company limited by shares | Live |
| ONLYONEUNEED TRADING LIMITED | Private company limited by shares | Live |
| ONLYOU ENTERPRISE SERVICE COMPANY LIMITED | Private company limited by shares | Live |
| ONLYPAY LIMITED | Private company limited by shares | Live Commenced dormancy on 30-Mar-2016 |
| ONLYTECH ELECTRONICS COMPANY LIMITED | | Live |
| ONLYTECH SYSTEMS INC LIMITED | Private company limited by shares | Dissolved |
| ONLYTECH TECHNOLOGY LIMITED | Private company limited by shares | Live |
| ONLYTEK INDUSTRIAL CO., LIMITED | Private company limited by shares | Dissolved |
| ONLYTEX ENTERPRISE CO., LIMITED | Private company limited by shares | Dissolved |
| ONLYU FURNITURE CO., LIMITED | Private company limited by shares | Dissolved |
| Onlyvog Corporation Limited | | Live |
| Onlyy E Co Limited | | Live |
| OnlyYou Household (Hong Kong) Holding Limited | Private company limited by shares | Live |
| ONMAIN LIMITED | Private company limited by shares | Dissolved |
| ONMAN INVESTMENTS LIMITED | Private company limited by shares | Live |
| ONMARCH LIMITED | Private company limited by shares | Dissolved |
| ONMARK LIMITED | Private company limited by shares | Dissolved |
| ONMARK LIMITED | Private company limited by shares | Dissolved |
| ONMARK ENTERPRISES LIMITED | Private company limited by shares | Live |
| ONMARK METALS LIMITED | Private company limited by shares | Live |
| ON-MASSY LIMITED | Private company limited by shares | Dissolved |
| ON-MASSY CO., LIMITED | Private company limited by shares | Live |
| ONMATE LIMITED | Private company limited by shares | Live |
| ONMATE ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| ONMATE INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| ONMATE INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| ONMATE MANAGEMENT LIMITED | Private company limited by shares | Dissolved |
| ONMATE RESOURCES LIMITED | Private company limited by shares | Dissolved |
| ONMATE TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| ONMATE TRADING LIMITED | Private company limited by shares | Dissolved |
| ONMAX DEVELOPMENTS LIMITED | Private company limited by shares | Dissolved |
| ONMAX ENTERPRISES LIMITED | Private company limited by shares | Live |
| ONMAX INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| ON-MAX INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| ONMAX INVESTMENT LIMITED | Private company limited by shares | Live |
| ONMAX PROPERTIES LIMITED | Private company limited by shares | Live |
| ONMAX TRADING LIMITED | Private company limited by shares | Dissolved |
| ONMAX TRADING LIMITED | Private company limited by shares | Live |
| ONMAY LIMITED | Private company limited by shares | Live |
| ONME LIMITED | | Live |
| ONMEDIA21 COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONMEN LIMITED | Private company limited by shares | Dissolved |
| ONMEN INVESTMENT LIMITED | Private company limited by shares | Live |
| ON-MERRY LIMITED | Private company limited by shares | Dissolved |
| ONMEX LIMITED | Private company limited by shares | Live |
| ONMI GOAL INTERNATIONAL LIMITED | Private company limited by shares | Live |
| ONMI LINK LIMITED | Private company limited by shares | Live |
| ONMICRO LIMITED | Private company limited by shares | Live |
| ONMIGHT TRADING LIMITED | Private company limited by shares | Dissolved |
| ONMILES LIMITED | Private company limited by shares | Dissolved |
| ONMILLION GARMENT MANUFACTORY LIMITED | Private company limited by shares | Dissolved |
| ONMILLION INDUSTRIAL LIMITED | Private company limited by shares | Live |
| ONMIND LIMITED | Private company limited by shares | Dissolved |
| ONMIND INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| ONMONEY LIMITED | Private company limited by shares | Dissolved |
| ONMOSE LIMITED | Private company limited by shares | Dissolved |
| ONMOST LIMITED | Private company limited by shares | Live |
| ONMOST INVESTMENTS LIMITED | Private company limited by shares | Live |
| ONMOST SUCCESS LIMITED | Private company limited by shares | Live |
| ONMOVE COMPANY LIMITED | Private company limited by shares | Live |
| ONMUSE FURNITURE CO., LIMITED | Private company limited by shares | Live |
| OnMyApps Marketing Limited | Private company limited by shares | Live |
| OnMyGrad Limited | Private company limited by shares | Live |
| ONNA ONNA COLLECTIONS LIMITED | Private company limited by shares | Dissolved |
| ONNA GLOBAL LIMITED | Private company limited by shares | Live |
| Onna International Limited | Private company limited by shares | Live |
| Onnekas Limited | Private company limited by shares | Live |
| ONNES LIMITED | Private company limited by shares | Dissolved |
| OnNet Technology Limited | Private company limited by shares | Dissolved |
| ON-NET SERVICE TECHNOLOGY LIMITED | Private company limited by shares | Live |
| ON-NET TRADER LIMITED | Private company limited by shares | Dissolved |
| ONNEX LIMITED | Private company limited by shares | Live |
| Art Onni Limited | Private company limited by shares | Live |
| Onni Consulting Limited | Private company limited by shares | Live |
| ONNI CONSTRUCTION & ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONNI INTERNATIONAL LIMITED | Private company limited by shares | Live |