| SUMIDA LCM COMPANY LIMITED | Private company limited by shares | Dissolved |
| SUMIDA CORPORATE SERVICE COMPANY LIMITED | Private company limited by shares | Dissolved |
| SUMIDA ELECTRIC (H.K.) COMPANY LIMITED | Private company limited by shares | Live |
| SUMIDA ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| Hong Kong Sumida Trading Co., Limited | Private company limited by shares | Live |
| SUMIDA & ICHIRO YAWATA FOUNDATION LIMITED | Company limited by guarantee | Live |
| SUMIDA INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| SUMIDA OPT-ELECTRONICS COMPANY LIMITED | Private company limited by shares | Dissolved |
| SUMIDA PRECISION (H.K.) COMPANY LIMITED | Private company limited by shares | Dissolved |
| SUMIDA SERVICE COMPANY LIMITED | Private company limited by shares | Live |
| SUMIDA TRADING COMPANY LIMITED | Private company limited by shares | Live |
| SUMIDA ELECTRIC (VIETNAM) COMPANY LIMITED | Private company limited by shares | Dissolved |
| SUMIDA WITTIS ELECTRONICS COMPANY LIMITED | Private company limited by shares | Dissolved |