| Company Name | Type | Status |
|---|---|---|
| TONO LIMITED | Private company limited by shares | Live |
| TONOCH AUDIO COMPANY LIMITED | Private company limited by shares | Live |
| TONOCH ELECTRONICS CO., LIMITED | Live | |
| Tonolabo Limited | Private company limited by shares | Live |
| TONOR TECHNOLOGY LIMITED | Private company limited by shares | Live |
| HONG KONG TONOS LIMITED | Private company limited by shares | Live |
| TONOTECH LIMITED | Private company limited by shares | Live |