| MAINSTREAM LIMITED | Private company limited by shares | Dissolved |
| MAINSTREAM COMPANY LIMITED | Private company limited by shares | Live |
| MAINSTREAM LIMITED | | Live |
| MAINSTREAM ASIA LIMITED | Private company limited by shares | Dissolved |
| PARENTS ASSOCIATION OF AUTISTIC CHILDREN IN MAINSTREAM EDUCATION LIMITED -THE- | Company limited by guarantee | Live |
| Mainstream Enterprise Limited | Private company limited by shares | Live |
| MAINSTREAM ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| MAINSTREAM FINANCE LIMITED | Private company limited by shares | Dissolved |
| MAINSTREAM INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| LONG MAINSTREAM LIMITED | | Live |
| Mainstream Trade Limited | Private company limited by shares | Live |