| GIGA-TECH ROCK DRILLING LIMITED | Private company limited by shares | Live |
| GIGATECH (HK) CO., LIMITED | Private company limited by shares | Live |
| GIGATECH INTERNATIONAL LIMITED | Private company limited by shares | Live |
| GIGATEK LIMITED | Private company limited by shares | Live |
| Gigatel HK Limited | Private company limited by shares | Dissolved |
| GIGATRON LIMITED | Private company limited by shares | Live |
| GIGATRON (HK) LIMITED | Private company limited by shares | Live |
| GIGAVISIONS NETWORK LIMITED | Private company limited by shares | Live |
| GIGAWATT INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| Gigawave Technology Limited | | Live |
| GigaWealth Limited | Private company limited by shares | Live |
| GIGAWELL INTERNATIONAL (HK) TRADING CO., LIMITED | Private company limited by shares | Dissolved |
| Giga-World Limited | | Live |
| Gigazoom Energy Limited | | Live |