| SiYo Biotech Limited | Private company limited by shares | Live |
| SIYO METAL (HONGKONG) CO., LIMITED | Private company limited by shares | Live |
| SIYO INTERNATIONAL COMPANY LIMITED | Private company limited by shares | Live |
| SIYOL LIMITED | Private company limited by shares | Dissolved |
| SHENZHEN SIYONG TECHNOLOGY LIMITED | Private company limited by shares | Live |
| SIYOTO ACOUSTIC (HK) CO., LIMITED | Private company limited by shares | Live |
| SIYOTO ELECTRONICS CO. LIMITED | Private company limited by shares | Live |
| SIYOU LIMITED | | Live |
| SIYOUNG-TECH LIMITED | Private company limited by shares | Live |