| Company Name | Type | Status |
|---|---|---|
| SIGMAT INTERNATIONAL LIMITED | Private company limited by shares | Live |
| SIGMA-TECH LIMITED | Private company limited by shares | Dissolved |
| SigmaTel Asia, Limited | Private company limited by shares | Dissolved |
| SIGMATEX INDUSTRIES LIMITED | Private company limited by shares | Dissolved |
| SIGMATIME LIMITED | Private company limited by shares | Dissolved |
| SIGMA-TRADE LIMITED | Private company limited by shares | Dissolved |
| SIGMATRONIC COMPANY LIMITED | Private company limited by shares | Dissolved |