| QUARTZ LIMITED | Private company limited by shares | Dissolved |
| MEC QUARTZ LIMITED | Private company limited by shares | Dissolved |
| QUARTZ LIMITED | Private company limited by shares | Live |
| GLS QUARTZ LIMITED | | Live |
| QUARTZ INVESTMENT CO., LIMITED | Private company limited by shares | Live |
| LANNO QUARTZ CO., LIMITED | Private company limited by shares | Live |
| QUARTZ Trade Co., Limited | Private company limited by shares | Live |
| QUARTZ DIALS FACTORY LIMITED | Private company limited by shares | Live |
| QUARTZ DRAGON LIMITED | Private company limited by shares | Live |
| QUARTZ ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| GREEN QUARTZ LIMITED | Private company limited by shares | Live |
| TOP QUARTZ GROUP LIMITED | Private company limited by shares | Live |
| In Quartz Group HK Limited | | Live |
| KIYA QUARTZ COMPANY LIMITED | Private company limited by shares | Dissolved |
| Legend Quartz Company Limited | Private company limited by shares | Live |
| QUARTZ LINK, LIMITED | | Live |
| MAINLAND QUARTZ COMPANY LIMITED | Private company limited by shares | Live |
| QUARTZ METAL MANUFACTURING COMPANY LIMITED | Private company limited by shares | Dissolved |
| QUARTZ PACIFIC LIMITED | Private company limited by shares | Dissolved |
| QUARTZ ROCK LIMITED | Private company limited by shares | Live |
| STUDIO 268 QUARTZ TIME LIMITED | Private company limited by shares | Dissolved |
| QUARTZ TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| QUARTZ TIME LIMITED | Private company limited by shares | Dissolved |
| SUPERTIME QUARTZ WATCH MANUFACTURING LIMITED | Private company limited by shares | Dissolved |
| Wise Quartz Investments Limited | Private company limited by shares | Live |
| QUARTZAL LIMITED | Private company limited by shares | Live Commenced dormancy on 12-Jul-1996 |
| QUARTZERA CAPITAL LIMITED | Private company limited by shares | Live |
| QUARTZROCK INTERNATIONAL LIMITED | Private company limited by shares | Live |
| QUARTZTIME (HK) LIMITED | Private company limited by shares | Live |