| S.I.R. Alesund Hong Kong Limited | Private company limited by shares | Live |
| Sub-Intelligence Robotics (SIR) Corporation (Hong Kong) Limited | Private company limited by shares | Live |
| S.I.R. Production Limited | Private company limited by shares | Live |
| SIRA BEAUTY LIMITED | Private company limited by shares | Live |
| HK SIRA ELECTRONIC LIMITED | Private company limited by shares | Live |
| Siracon Limited | Private company limited by shares | Live |
| Siracusa Consiglio Limited | Private company limited by shares | Live |
| SIRACUSA GROUP LIMITED | Private company limited by shares | Dissolved |
| SIRADAR TECHNOLOGY LIMITED | Private company limited by shares | Live |
| SIRADEL ASIA LIMITED | Private company limited by shares | Live |
| SIRA(INTERNATIONAL) TRADE LIMITED | Private company limited by shares | Live |
| Siraj Art Limited | Private company limited by shares | Live |
| Siraj CK Capital Limited | Private company limited by shares | Live |
| SIRAJ AL TATWEER CO., LIMITED | Private company limited by shares | Live |
| SIRAJ TRADE LIMITED | Private company limited by shares | Live |
| SIRAKOV LIMITED | Private company limited by shares | Dissolved |
| SIRAL INVESTMENTS PTY LIMITED | Private company limited by shares | Live |
| SIRALMA LIMITED | Private company limited by shares | Dissolved |
| Siramik Limited | Private company limited by shares | Live |
| Siranda Lighting Limited | Private company limited by shares | Live Commenced dormancy on 06-Jul-2018 |
| SIRANDA ELECTRICAL TECHNOLOGY LIMITED | Private company limited by shares | Live |
| SIRAPTON COMPANY LIMITED | Private company limited by shares | Dissolved |
| SIRAS LIMITED | Private company limited by shares | Live |
| SIRAT INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| SIRAY LIMITED | Private company limited by shares | Dissolved |
| SIRAY INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| SIRAY ELECTRONIC TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| Sirby Elevator Group Limited | Private company limited by shares | Live |
| Sircaltee Limited | Private company limited by shares | Live |
| SIRCLE HONG KONG LIMITED | Private company limited by shares | Live |
| SIRCONIX ELECTRONICS COMPANY LIMITED | | Live |
| SIRCROWD LIMITED | Private company limited by shares | Dissolved |
| SIRDAR LIMITED | Private company limited by shares | Dissolved |
| SIRDOM COMPANY LIMITED | Private company limited by shares | Dissolved |
| SIREALTON LIMITED | Private company limited by shares | Dissolved |
| SIRED TRADE COMPANY LIMITED | Private company limited by shares | Live |
| SIREDA LIMITED | Private company limited by shares | Live |
| Sireda Technology Co., Limited | Private company limited by shares | Live |
| SIREDA TECHNOLOGIES (HONG KONG) CO., LIMITED | Private company limited by shares | Live |
| SIREE HONGKONG CO., LIMITED | Private company limited by shares | Live |
| SIREGRAND INDUSTRIAL LIMITED | Private company limited by shares | Live |
| SIREN LIMITED | Private company limited by shares | Live |
| SIREN E&P LIMITED | Private company limited by shares | Live |
| Siren Limited | | Live |
| SIREN KOREAN CLOTHING COMPANY LIMITED | Private company limited by shares | Dissolved |
| Siren Engineering Company Limited | | Live |
| SIREN FASHION LIMITED | Private company limited by shares | Dissolved |
| FIJI SIREN LIMITED | Private company limited by shares | Live |
| SIREN BEAUTY GROUP LIMITED | Private company limited by shares | Dissolved |
| ITALY COLYRONA (SINGAPORE SIREN) INTERNATIONAL GROUP LIMITED | Private company limited by shares | Dissolved |
| SIRENA LIMITED | Private company limited by shares | Live |
| SIRENA (TAIWAN) MFG. CO., LIMITED | Private company limited by shares | Live |
| Guangzhou Sirena Co., Limited | Private company limited by shares | Live |
| GUANGZHOU SIRENA SHOES CO., LIMITED | Private company limited by shares | Live |
| SIRENE FASHIONS LIMITED | Private company limited by shares | Dissolved |
| SIRENE STRATEGY LIMITED | Private company limited by shares | Live |
| SIRENS PRODUCTIONS LIMITED | Private company limited by shares | Live |
| SIRENSENSE COMPANY LIMITED | Private company limited by shares | Dissolved |
| SIREPE INTERNATIONAL TRADING CO., LIMITED | Private company limited by shares | Dissolved |
| sirerwin Limited | Private company limited by shares | Live |
| SIRESOFT TECHNOLOGY COMPANY LIMITED | Private company limited by shares | Dissolved |
| SIRET Systems Limited | | Live |
| Sirex Limited | | Live |
| SIREY FANDA LIMITED | Private company limited by shares | Live |
| SIRG HK LIMITED | Private company limited by shares | Live |
| SIRG LIMITED | Private company limited by shares | Live |
| SIRHOLD INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| SIRHOUSE LIMITED | Private company limited by shares | Dissolved |
| SIRI COMPANY LIMITED | Private company limited by shares | Live |
| SIRI PTY LIMITED | Private company limited by shares | Live |
| SIRI CHINA LIMITED | Private company limited by shares | Dissolved |
| SIRI IMPEX LIMITED | | Live |
| GOLD SIRI INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| Siri Solutions Limited | | Live |
| Wong Siri Co., Limited | Private company limited by shares | Live |
| SIRIBAN LIMITED | Private company limited by shares | Dissolved |
| SIRIDE TRADE CO., LIMITED | Private company limited by shares | Live |
| Hong Kong Siride Technology Co. , Limited | | Live |
| SIRIETA LIMITED | Private company limited by shares | Live |
| SiriFit Limited | | Live |
| Sirimana Limited | Private company limited by shares | Live |
| SIRINTHORN IMPEX LIMITED | Private company limited by shares | Live |
| SIRIO LIMITED | Private company limited by shares | Live |
| SIRION LIMITED | Private company limited by shares | Dissolved |
| SIRIPEN LIMITED | Private company limited by shares | Live |
| A. J. SIRIS EASTERN LIMITED | Private company limited by shares | Dissolved |
| SIRIUS COMPANY LIMITED | Private company limited by shares | Dissolved |
| SIRIUS ART LIMITED | Private company limited by shares | Dissolved |
| BI SIRIUS LIMITED | Private company limited by shares | Dissolved |
| SIRIUS HK LIMITED | Private company limited by shares | Dissolved |
| SIRIUS COMPANY AS LIMITED | Private company limited by shares | Live |
| SIRIUS 369 LIMITED | Private company limited by shares | Live |
| Sirius Limited | Private company limited by shares | Live |
| Sirius JMS Limited | | Live |
| SIRIUS ONE LIMITED | | Live |
| Sirius CPA Limited | | Live |
| SIRIUS ASIA LIMITED | Private company limited by shares | Dissolved |
| SIRIUS BUSINESS PUBLISHING LIMITED | Private company limited by shares | Live |
| SIRIUS CAPITAL LIMITED | Private company limited by shares | Dissolved |
| SIRIUS CAPITAL LIMITED | Private company limited by shares | Live |