| Sigma Digital Solutions Limited | | Live |
| Sigma Space Company Limited | Private company limited by shares | Live |
| SIGMA SPORTS LIMITED | Private company limited by shares | Dissolved |
| SIGMA SUCCESS LIMITED | Private company limited by shares | Live |
| SIGMA TECHNIK LIMITED | Private company limited by shares | Live |
| SIGMA TELECOMMUNICATIONS LIMITED | Private company limited by shares | Live |
| SIGMA VENTURE LIMITED | Private company limited by shares | Live |
| Sigma-Aldrich Hong Kong Holding Limited | Private company limited by shares | Live |
| Sigmaart Company Limited | | Live |
| SigmaBrand Limited | Private company limited by shares | Dissolved |
| SigmaFi Technology Limited | | Live |
| SIGMAFORM PACIFIC LIMITED | Private company limited by shares | Dissolved |
| SIGMAI (ASIA) LIMITED | Private company limited by shares | Dissolved |
| SIGMAL ELECTRONICS CO., LIMITED | Private company limited by shares | Live |
| SigmaLayer Company Limited | | Live |
| Sigmalead Company Limited | Private company limited by shares | Live |
| Sigmalium Limited | | Live |
| SigmaNet Limited | Private company limited by shares | Dissolved |
| SigmaPlus Limited | Private company limited by shares | Live |
| Sigmarim Export Limited | Private company limited by shares | Dissolved |
| SIGMARK LIMITED | Private company limited by shares | Dissolved |
| SIGMASTER INTERACTIVE LIMITED | Private company limited by shares | Dissolved |
| 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 |
| SIGMAVENTURE LIMITED | Private company limited by shares | Dissolved |
| SIGMAWIT LIMITED | Private company limited by shares | Live |
| Sigmax Limited | | Live |
| SIGMAXPERT LIMITED | Private company limited by shares | Live |
| SIGMO HK LIMITED | | Live |
| Sigmob International Limited | Private company limited by shares | Live |
| Sigmob International Limited | Private company limited by shares | Live |
| SIGMUND ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| SIGMUND ESTATE LIMITED | Private company limited by shares | Dissolved |
| SIGN ON LIMITED | Private company limited by shares | Dissolved |
| EXO SIGN COMPANY LIMITED | Private company limited by shares | Dissolved |
| KEY SIGN LIMITED | Private company limited by shares | Dissolved |
| TOP SIGN LIMITED | Private company limited by shares | Dissolved |
| TOP SIGN LIMITED | Private company limited by shares | Dissolved |
| MAX SIGN LIMITED | Private company limited by shares | Dissolved |
| TOP SIGN LIMITED | Private company limited by shares | Dissolved |
| SIGN LIMITED | Private company limited by shares | Live |
| TOP SIGN LIMITED | Private company limited by shares | Dissolved |
| RED SIGN LIMITED | Private company limited by shares | Dissolved |
| SIGN PRO LIMITED | Private company limited by shares | Live |
| Boe Sign Company Limited | Private company limited by shares | Live |
| LU SIGN LIMITED | Private company limited by shares | Live |
| Sign E Limited | Private company limited by shares | Live |
| ACE SIGN LIMITED | Private company limited by shares | Live |
| NEW SIGN LIMITED | Private company limited by shares | Live |
| TOP SIGN LIMITED | | Live |
| ABSOLUTE SIGN ADVERTISING LIMITED -THE- | Private company limited by shares | Dissolved |
| LEE YUEN ADVERTISING SIGN COMPANY LIMITED | Private company limited by shares | Live |
| FIRST SIGN CAPITAL LIMITED | Private company limited by shares | Dissolved |
| LUCK SIGN (CHINA) LIMITED | Private company limited by shares | Live |
| CREATIVE SIGN CO., LIMITED | Private company limited by shares | Live |
| GRAND SIGN DEVELOPMENTS LIMITED | Private company limited by shares | Dissolved |
| JOY DIGITAL SIGN COMPANY LIMITED | Private company limited by shares | Dissolved |
| ELECTROTECH SIGN & DISPLAY LIMITED | Private company limited by shares | Dissolved |
| DRAGON SIGN LIMITED | Private company limited by shares | Dissolved |
| DRAGON SIGN LIMITED | Private company limited by shares | Live |
| DYNASTY SIGN LIMITED | Private company limited by shares | Dissolved |
| EASTERN SIGN LIMITED | Private company limited by shares | Live |
| EUROPEAN SIGN COMPANY LIMITED | Private company limited by shares | Dissolved |
| FIRST SIGN LIMITED | Private company limited by shares | Dissolved |
| FIRST SIGN COMPANY LIMITED | Private company limited by shares | Dissolved |
| GRAND SIGN LIMITED | Private company limited by shares | Dissolved |
| GRAND SIGN LIMITED | Private company limited by shares | Live |
| IMPERIAL SIGN LIMITED | Private company limited by shares | Live |
| FIRST SIGN INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| LUCK SIGN INVESTMENT LIMITED | Private company limited by shares | Live |
| CAPITAL SIGN INVESTMENTS LIMITED | Private company limited by shares | Live |
| WEALTHY SIGN INVESTMENTS LIMITED | Private company limited by shares | Live |
| LUCK SIGN LIMITED | Private company limited by shares | Live |
| FIRST SIGN MANUFACTURING LIMITED | Private company limited by shares | Dissolved |
| MASCOT SIGN LIMITED | Private company limited by shares | Dissolved |
| INNOVATIVE SIGN MATERIALS LIMITED | Private company limited by shares | Dissolved |
| Ninety-nine Sign Limited | | Live |
| CAPITAL SIGN TRADING LIMITED | Private company limited by shares | Dissolved |
| FIRST SIGN TRADING COMPANY LIMITED | Private company limited by shares | Dissolved |
| LUCK SIGN TRADING LIMITED | Private company limited by shares | Live |
| WEALTHY SIGN LIMITED | Private company limited by shares | Live |
| WEALTHY SIGN LIMITED | Private company limited by shares | Live |
| WINNING SIGN LIMITED | Private company limited by shares | Dissolved |
| Wisdom Sign Limited | Private company limited by shares | Live |
| SIGNA LIMITED | Private company limited by shares | Dissolved |
| SIGNAAL (CHINA) GROUP CO., LIMITED | Private company limited by shares | Live |
| SUN SIGNAGE LIMITED | Private company limited by shares | Live |
| SIGNAGE LIMITED -THE- | Private company limited by shares | Dissolved |
| HOT SIGNAGE COMPANY LIMITED | Private company limited by shares | Dissolved |
| SIGNAGE PRO LIMITED | Private company limited by shares | Live |
| JH SIGNAGE COMPANY LIMITED | Private company limited by shares | Live |
| CHINA DIGITAL SIGNAGE LIMITED | Private company limited by shares | Live |
| HALITECH TACTILE & SIGNAGE COMPANY LIMITED | Private company limited by shares | Dissolved |
| JET SIGNAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| WIN SIGNAL LIMITED | Private company limited by shares | Dissolved |