| KOEI CUSTOME COMPANY LIMITED | Private company limited by shares | Dissolved |
| KOEI ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| NISSHO KOEI (HK) COMPANY LIMITED | Private company limited by shares | Live Commenced dormancy on 23-Mar-2005 |
| KOEI PRECISION (H.K.) LIMITED | Private company limited by shares | Dissolved |
| KOEI ASSOCIATES HONG KONG COMPANY LIMITED | Private company limited by shares | Live |
| HONG KONG KOEI INVESTMENT COMPANY LIMITED | Private company limited by shares | Live |
| KOEI (HONG KONG) COMPANY, LIMITED | Private company limited by shares | Dissolved |
| KOEI HONG KONG LIMITED | Private company limited by shares | Live |
| KOEI INFORMATION ENGINEERING (H.K.) COMPANY LIMITED | Private company limited by shares | Dissolved |
| KOEI INTERNATIONAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| Koei (France) International Holding Co., Limited | | Live |
| NIPPON KOEI CHINA COMPANY LIMITED | Private company limited by shares | Dissolved |
| KOEI TUSHO (HONG KONG) CO., LIMITED | Private company limited by shares | Live |