| ART KAIHATSU (H.K.) COMPANY LIMITED | Private company limited by shares | Live |
| TOSHI KAIHATSU ENGINEERING (H.K.) LIMITED | Private company limited by shares | Dissolved |
| TAIRIKU KAIHATSU (H.K.) COMPANY LIMITED | Private company limited by shares | Dissolved |
| TONAN KAIHATSU COMPANY (HK) LIMITED | Private company limited by shares | Dissolved |
| NIPPON HONGKONG KAI-HATSU CORPORATION LIMITED | Private company limited by shares | Dissolved |
| KYOKUSHIN UNYU KAIHATSU INTERNATIONAL LIMITED | Private company limited by shares | Live |
| KYOKUSHIN UNYU KAIHATSU INTERNATIONAL HK LIMITED | Private company limited by shares | Live |
| TOKOU KAIHATSU COMPANY LIMITED | Private company limited by shares | Dissolved |