| SIGMA V LIMITED | Private company limited by shares | Live |
| SIGMA LIMITED | Private company limited by shares | Dissolved |
| SIGMA LIMITED | Private company limited by shares | Live |
| SIX SIGMA LIMITED | Private company limited by shares | Dissolved |
| AMG SIGMA LIMITED | Private company limited by shares | Dissolved |
| Pop Sigma Limited | Private company limited by shares | Live |
| 6 SIGMA LIMITED | Private company limited by shares | Live |
| Lex Sigma Limited | Private company limited by shares | Live |
| Sigma X PTE Limited | Private company limited by shares | Live |
| Sigma 6 Limited | Private company limited by shares | Live |
| Sigma Tau Limited | Private company limited by shares | Live |
| SIGMA ASIA LIMITED | Private company limited by shares | Dissolved |
| SIGMA ASIA LIMITED | Private company limited by shares | Live |
| Sigma V (Asia) Pty Limited | Private company limited by shares | Live |
| SIGMA GI (ASIA) LIMITED | Private company limited by shares | Live |
| SIGMA CAPITAL LIMITED | | Live |
| CHINA SIGMA (H.K.) CO., LIMITED | Private company limited by shares | Live |
| SIGMA CONSORTIUM LIMITED | | Live |
| SIGMA CAPITAL CONSORTIUM LIMITED | | Live |
| Sigma Consultancy Limited | | Live |
| Six Sigma Controls Limited | Private company limited by shares | Live |
| SIGMA DELTA LIMITED | Private company limited by shares | Dissolved |
| SIGMA DIAMONDS LIMITED | Private company limited by shares | Live |
| SIGMA TEL AND ELECTROICS LIMITED | Private company limited by shares | Live |
| SIGMA ENTERPRISE LIMITED | Private company limited by shares | Dissolved |
| SIGMA ENTERPRISE LIMITED | Private company limited by shares | Live |
| SIGMA ENTERPRISES LIMITED | Private company limited by shares | Live |
| Sigma Entertainment Limited | Private company limited by shares | Live |
| Sigma Equity Limited | Private company limited by shares | Live |
| SIX SIGMA FINANCE LIMITED | Private company limited by shares | Live |
| SIGMA FOOTWEAR LIMITED | Private company limited by shares | Dissolved |
| Sigma Frontier Limited | | Live |
| SIGMA Greece Limited | Private company limited by shares | Live |
| SIGMA HI-TECH LIMITED | Private company limited by shares | Dissolved |
| SIGMA HOLDING COMPANY LIMITED | Private company limited by shares | Dissolved |
| SIX SIGMA HOLDING LIMITED | Private company limited by shares | Live |
| Sigma Holding Enterprise Limited | Private company limited by shares | Live |
| CHINA HONG KONG SIX SIGMA ASSOCIATION LIMITED | Private company limited by shares | Dissolved |
| SIGMA INSURANCE BROKERS LIMITED | Private company limited by shares | Live Commenced dormancy on 26-Oct-2007 |
| SIGMA INVESTMENT COMPANY LIMITED | Private company limited by shares | Dissolved |
| SIGMA INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| Sigma Capital Investment Limited | Private company limited by shares | Live |
| Sigma Sigma Capital Investment Limited | Private company limited by shares | Live |
| SIGMA INVESTMENT CONSORTIUM LIMITED | | Live |
| SIGMA INVESTMENTS COMPANY LIMITED | Private company limited by shares | Dissolved |
| SIGMA INVESTMENTS LIMITED | Private company limited by shares | Live |
| SIGMA LEISURE COMPANY LIMITED | Private company limited by shares | Live |
| LIN'S SIGMA LIMITED | Private company limited by shares | Dissolved |
| Sigma Mascot Company Limited | Private company limited by shares | Live |
| SIGMA MICROELECTRONICS LIMITED | Private company limited by shares | Live |
| SIGMA MOBILITY COMPANY LIMITED | | Live |
| ORIENT SIGMA LIMITED | Private company limited by shares | Live |
| Two Sigma Asia Pacific, Limited | Private company limited by shares | Live |
| SIGMA PETRA LIMITED | Private company limited by shares | Dissolved |
| SIGMA POLYCHEM LIMITED | Private company limited by shares | Live |
| SIGMA PROPERTIES LIMITED | Private company limited by shares | Dissolved |
| SIGMA PROTECH COMPANY LIMITED | Private company limited by shares | Live |
| SIGMA RESOURCES LIMITED | Private company limited by shares | Live |
| SIGMA SHIPPING COMPANY, LIMITED -THE- | Private company limited by shares | Live |
| Sigma Solutions Limited | Private company limited by shares | Live |
| 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 |