| OpenSales Foundation Limited -The- | Private company limited by shares | Dissolved |
| OPENSEA LIMITED | Private company limited by shares | Live |
| Opensense Limited | | Live |
| OPENSHAW LIMITED | Private company limited by shares | Dissolved |
| Openshow Limited | | Live |
| OPENSIDE INTERNATIONAL TRADE LIMITED | Private company limited by shares | Live |
| OPENSKOOLS LIMITED | Private company limited by shares | Live |
| OpenSky Limited | Private company limited by shares | Live |
| OPENSOFT SYSTEM COMPANY LIMITED | Private company limited by shares | Dissolved |
| OPENSOURCE.COM HK LIMITED | Private company limited by shares | Dissolved |
| OpenSpace DB Limited | Private company limited by shares | Live |
| OPENSPARK LIMITED | Private company limited by shares | Dissolved |
| OPENSPEEDY TRADING LIMITED | Private company limited by shares | Live |
| OpenST Limited | Company limited by guarantee | Live |
| OpenStack Limited | Private company limited by shares | Live |
| OPENSTAR COMPANY LIMITED | Private company limited by shares | Dissolved |
| OPENSTRAT LIMITED | Private company limited by shares | Live |
| DDC OpenStudio Media Limited | Private company limited by shares | Live |