| DECOM LIMITED | Private company limited by shares | Live |
| DECOM ELECTRICS LIMITED | Private company limited by shares | Live |
| Decoman Lab Limited | | Live |
| DECOMAN INVESTMENT LIMITED | Private company limited by shares | Live |
| HK DECOMAN TECHNOLOGY LIMITED | Private company limited by shares | Live |
| DECOMANN (HK) COMPANY LIMITED | Private company limited by shares | Live |
| DECOMANN INTERIORS LIMITED | Private company limited by shares | Dissolved |
| DECOMAYA COMPANY LIMITED | Private company limited by shares | Live |
| DECOMILK LIMITED | Private company limited by shares | Live |
| DECOMIN INDUSTRIAL COMPANY LIMITED | Private company limited by shares | Live |
| DECOMIN TRADING LIMITED | Private company limited by shares | Live |
| Decomplex Limited | Private company limited by shares | Dissolved |
| DECOMPRESSION LIMITED | Private company limited by shares | Dissolved |
| No Decompression Limited | Private company limited by shares | Live |
| Decomur Limited | Private company limited by shares | Dissolved |