| SIGA LIMITED | Private company limited by shares | Dissolved |
| SIGA COMPANY LIMITED | Private company limited by shares | Live |
| SIGA CLOTHING CO., LIMITED | | Live |
| SHENZHEN SIGA TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| SIGA COMPUTERS LIMITED | Private company limited by shares | Dissolved |
| SIGA GLOBAL LIMITED | Private company limited by shares | Live |
| SIGA GROUP LIMITED | Private company limited by shares | Dissolved |
| CHANCE SIGA GROUP (HK) LIMITED | Private company limited by shares | Live |
| SIGA TECHNOLOGY HOLDINGS CO., LIMITED | Private company limited by shares | Live |
| Hong Kong Siga Electronics Co., Limited | Private company limited by shares | Live |
| SIGA ELECTRIC (HONGKONG) LIMITED | Private company limited by shares | Live |
| China Siga International Trade Co., Limited | Private company limited by shares | Live |
| FRANCE VALENTINO SIGA INT'L FASHION LIMITED | Private company limited by shares | Dissolved |
| SIGA MICROTECH LIMITED | Private company limited by shares | Live |
| Siga Packaging Material Limited | | Live |
| SIGA (CHINA) TRADING CO., LIMITED | Private company limited by shares | Live |
| Zhuofen Siga Trade Limited | Private company limited by shares | Live |
| SIGALLO ASIA LIMITED | Private company limited by shares | Dissolved |
| SigAlpha Limited | Private company limited by shares | Live |
| HK SIGAMNAAP LIMITED | Private company limited by shares | Live |
| SIGART PCB ELECTRONIC TECHNOLOGY COMPANY LIMITED | Private company limited by shares | Live |
| SIGAS FINANCE LIMITED | Private company limited by shares | Dissolved |
| SIGASIA TECHNOLOGIES LIMITED | Private company limited by shares | Dissolved |
| Sigastart Technology Limited | Private company limited by shares | Live |
| SIGATEC LIMITED | Private company limited by shares | Live |