| ONPOP LIMITED | Private company limited by shares | Live |
| ONPORT INVESTMENT LIMITED | Private company limited by shares | Live |
| ONPORT RESOURCES LIMITED | Private company limited by shares | Dissolved |
| ONPOWAY LIMITED | Private company limited by shares | Dissolved |
| ONPOWER CONSTRUCTION AND ENGINEERING COMPANY LIMITED | | Live |
| ONPOWER GROUP LIMITED | Private company limited by shares | Live |
| ONPOWER INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| ONPOWER INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| ONPRAISE COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONPRESS COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONPRESS LIMITED | Private company limited by shares | Dissolved |
| Onpress PCB Limited | Private company limited by shares | Live |
| ONPRO LIMITED | Private company limited by shares | Dissolved |
| ONPROFIT PROPERTIES LIMITED | Private company limited by shares | Live |
| ON-PROJECTS INVESTMENT LIMITED | Private company limited by shares | Live |
| ONPROSPER COMPANY LIMITED | Private company limited by shares | Live |
| Onpun Limited | Private company limited by shares | Live |
| OnQore Limited | Private company limited by shares | Dissolved |
| OnQu Technologies Limited | Private company limited by shares | Live |
| ONREE LIMITED | Private company limited by shares | Live |
| ONRESOURCES LIMITED | Private company limited by shares | Dissolved |
| OnRewards Asia Limited | | Live |
| ONREX LIMITED | Private company limited by shares | Dissolved |
| ONREX ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| ONRIC LIMITED | Private company limited by shares | Dissolved |
| ONRIC CPA LIMITED | Private company limited by shares | Live |
| ONRICH COMPANY LIMITED | Private company limited by shares | Live |
| ONRIGHT LIMITED | Private company limited by shares | Dissolved |
| ONRIGHT INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| ONRING LIMITED | Private company limited by shares | Dissolved |
| ONRISE LIMITED | Private company limited by shares | Live |
| ONRISE INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| ONRISE INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| ONROAD ASIA LIMITED | Private company limited by shares | Dissolved |
| ONROAD SOLUTIONS LIMITED | Private company limited by shares | Live |
| ONROLL LIMITED | Private company limited by shares | Live |
| On-Route Trading Limited | | Live |
| ONROY COMPANY LIMITED | Private company limited by shares | Dissolved |
| ON'S CONSTRUCTION LIMITED | | Live |
| O.N.S. TRADE & FINANCE (HK) LIMITED | Private company limited by shares | Live |
| O.N.S CORPORATION HONG KONG LIMITED | Private company limited by shares | Live |
| ON'S INDUSTRIAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| O.N.S. INTERNATIONAL LIMITED | Private company limited by shares | Live |
| ONS' SEA PRODUCTS SUPPLIES LIMITED | Private company limited by shares | Dissolved |
| On's Station Creative Design Limited | Private company limited by shares | Live |
| Onsa Asia Holding Limited | Private company limited by shares | Live |
| HK ONSAATDAAN LIMITED | Private company limited by shares | Live |
| ONSAFE LIMITED | Private company limited by shares | Dissolved |
| ONSAFE (CHINA) LIMITED | Private company limited by shares | Dissolved |
| ONSAFE CONTAINER SERVICE LIMITED | Private company limited by shares | Dissolved |
| ONSAFE INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| ONSAFE TRADING LIMITED | Private company limited by shares | Dissolved |
| ONSALA ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| ONSALE PLASTIC FACTORY LIMITED | Private company limited by shares | Dissolved |
| ONSALES COMPANY LIMITED | Private company limited by shares | Live |
| ONSAN LIMITED | Private company limited by shares | Dissolved |
| ONSANE LIMITED | Private company limited by shares | Dissolved |
| ONSANFANTA COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONSAN-TOWA COMPANY LIMITED | Private company limited by shares | Dissolved |
| OnSarang Presbyterian Church of Hong Kong Limited | Company limited by guarantee | Live |
| Onsavii Limited | Private company limited by shares | Live |
| ONSBERG LIMITED | Private company limited by shares | Live |
| ON-SCHEME LIMITED | Private company limited by shares | Dissolved |
| Onscreen Company Limited | Private company limited by shares | Live |
| ONSCREENSHOW (HK) LIMITED | Private company limited by shares | Live |
| ONSEE COMPANY LIMITED | Private company limited by shares | Live |
| ONSEIN HOLDING LIMITED | Private company limited by shares | Live |
| ONSEN LIMITED | Private company limited by shares | Live |
| ONSEN CPA LIMITED | Private company limited by shares | Live |
| CAFE ONSEN TAMAGO LIMITED | Private company limited by shares | Live |
| ONSEN INDUSTRY CO., LIMITED | Private company limited by shares | Live |
| ONSEN ELECTRONICS LIMITED | | Live |
| ONSEN GROUP CO LIMITED | | Live |
| ONSEN INDUSTRY GROUP COMPANY LIMITED | Private company limited by shares | Live |
| Onsen Metal Industrial Limited | Private company limited by shares | Live |
| ONSEN TRADING LIMITED | Private company limited by shares | Dissolved |
| ONSENG LIMITED | Private company limited by shares | Live |
| FRANCE ONSENSE HOLDING LIMITED | Private company limited by shares | Live |
| ONSENSE SHIPPING LIMITED | Private company limited by shares | Live |
| ONSET (ASIA) LIMITED | Private company limited by shares | Live |
| ONSET DESIGN DECORATION AND ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| Onset Investment Limited | Private company limited by shares | Live |
| ONSET TRADING COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONSHAN MINERAL LIMITED | Private company limited by shares | Live |
| ONSHINE LIMITED | Private company limited by shares | Dissolved |
| ONSHINE LIMITED | Private company limited by shares | Dissolved |
| ONSHINY GROUP LIMITED | Private company limited by shares | Live |
| ONSHIP LIMITED | Private company limited by shares | Dissolved |
| ONSHOP CO., LIMITED | | Live |
| Onshorer Business Limited | Private company limited by shares | Live |
| ONSIA ALUMINIUM WORK'S (H.K.) COMPANY LIMITED | Private company limited by shares | Dissolved |
| ONSIA TRADING LIMITED | Private company limited by shares | Dissolved |
| Onsidai Logistics Co., Limited | | Live |
| ONSIDE ASIA LIMITED | Private company limited by shares | Dissolved |
| SHENZHEN ONSIDE TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| Onside Consulting Limited | | Live |
| Onside Partners Limited | Private company limited by shares | Live |
| Onsieve Limited | | Live |
| OnSign TV Limited | Private company limited by shares | Live |
| ONSING CONSULTANT LIMITED | Private company limited by shares | Live |