| SUMWOOD LIMITED | Private company limited by shares | Dissolved |
| Sum-Wood Group Investment Limited | Private company limited by shares | Live |
| SUMWOOD (HK) LIMITED | Private company limited by shares | Dissolved |
| SUMWOOD INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| SUM-WOOD PRODUCTIONS LIMITED | Private company limited by shares | Live |
| SUMWWW ELECTRONICS LIMITED | Private company limited by shares | Live |
| SUMXIN INTERNATIONAL CO. LIMITED | Private company limited by shares | Live |
| Sumxing Co., Limited | Private company limited by shares | Live |
| SUMYAT LIMITED | Private company limited by shares | Live |
| SUMYEE FOODS LIMITED | Private company limited by shares | Live |
| HK SUMYEE TRADING LIMITED | Private company limited by shares | Live |
| SUMYI (LAMTIN) COMPANY LIMITED | Private company limited by shares | Live |
| SUMYIELD COMPANY LIMITED | Private company limited by shares | Dissolved |
| SumYin Limited | Private company limited by shares | Live |
| SUMYING TRADE CO., LIMITED | Private company limited by shares | Live |
| Sumyiptea Limited | | Live |
| SUMYI.YL Company Limited | Private company limited by shares | Live |
| Sumyth Trading Company Limited | | Live |
| SUMYUN TRADING CO., LIMITED | Private company limited by shares | Live |
| SUMZI LAB LIMITED | | Live |
| Sumzoeng Limited | Private company limited by shares | Live |