| T.W.Y. CO., LIMITED | Private company limited by shares | Dissolved |
| TWYCROSS INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| TWYER LIMITED | | Live |
| TWYF ENGINEERING LIMITED | | Live |
| J. TWYFORD AND SON LIMITED | Company limited by guarantee | Dissolved |
| TWYFORD LIMITED | Private company limited by shares | Live |
| TWYFORD INVESTMENTS COMPANY LIMITED | Private company limited by shares | Dissolved |
| TWYLA LIMITED | Private company limited by shares | Live |
| Twylabs Limited | Private company limited by shares | Live |
| TWYNX COMPANY LIMITED | Private company limited by shares | Live |
| Twyss Co. Limited | Private company limited by shares | Live |
| TWYWA ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| TWYWA ENGINEERING (HONG KONG) LIMITED | Private company limited by shares | Live |