| SONO MED LIMITED | Private company limited by shares | Live |
| SONOCO LIMITED | Private company limited by shares | Dissolved |
| SONOESS TECHNOLOGY (HONGKONG) CO., LIMITED | Private company limited by shares | Live |
| Sonoff Limited | | Live |
| SONOHOKA LIMITED | Private company limited by shares | Live |
| Sonolife Limited | Private company limited by shares | Live |
| SONOLIFE HK LIMITED | Private company limited by shares | Live |
| SONOMA LIMITED | Private company limited by shares | Dissolved |
| Sonomama Limited | | Live |
| Sono-Medical Logistic & Trading Limited | Private company limited by shares | Live |
| Sonomos Software Limited | Private company limited by shares | Live |
| SONON LIMITED | Private company limited by shares | Live |
| SONON UNIONTECH (HONG KONG) COMPANY LIMITED | Private company limited by shares | Live |
| SONOON INDUSTRY LIMITED | Private company limited by shares | Live |
| Sonop Limited | Private company limited by shares | Live |
| SonoPet-Mobile Limited | Private company limited by shares | Live |
| SONOR COMPANY LIMITED | Private company limited by shares | Live |
| SONORA LIMITED | Private company limited by shares | Live |
| SONORA LIMITED | Private company limited by shares | Live |
| Anzeck Sonorin Medical Limited | Private company limited by shares | Live |
| SONORITY ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| SONOROUS LIMITED | Private company limited by shares | Dissolved |
| Sonorus Network Limited | | Live |
| SONOSCAN ASIA PACIFIC LIMITED | Private company limited by shares | Live |
| SONOSCAPE CO., LIMITED | Private company limited by shares | Live |
| SONOSCAPE HONG KONG LIMITED | Private company limited by shares | Dissolved |
| Sonosite Limited | Private company limited by shares | Live |
| Sonoss Limited | Private company limited by shares | Live |
| SONOSTAR LIMITED | Private company limited by shares | Live |
| PRONOT SONOT LIMITED | Private company limited by shares | Dissolved |
| Sonotap Limited | Private company limited by shares | Live |
| SONOTEC FAR EAST LIMITED | Private company limited by shares | Live |
| SONOTECH Limited | Private company limited by shares | Live |
| SONOTEK INDUSTRIAL LIMITED | Private company limited by shares | Live |
| Sonotel O2 Limited | Private company limited by shares | Live |
| SONOTRI HK LIMITED | Private company limited by shares | Dissolved |
| SONOTRONIC HK LIMITED | Private company limited by shares | Live |
| SonoUltrasonic Limited | Private company limited by shares | Live |
| SONOVA Limited | Private company limited by shares | Live |