| YAKU LIMITED | Private company limited by shares | Dissolved |
| YAKUBOV GROUP HONG KONG LIMITED | Private company limited by shares | Live |
| Seiko Eiyo Yakuhin Co., Limited | Private company limited by shares | Live |
| SEIKO EIYO YAKUHIN CO., LIMITED | | Live |
| YAKUMO LIMITED | Private company limited by shares | Dissolved |
| YAKUMO CO., LIMITED | Private company limited by shares | Dissolved |
| YAKUMO ELECTRONICS LIMITED | Private company limited by shares | Dissolved |
| YAKUMO ASIA PACIFIC LIMITED | Private company limited by shares | Dissolved |
| YAKURI LIMITED | Private company limited by shares | Dissolved |
| Yakushi Limited | Private company limited by shares | Live |
| YAKUTIAN DIAMOND COMPANY LIMITED | Private company limited by shares | Dissolved |
| Yakutsk (China) Limited | Private company limited by shares | Live |