| SYDENHAM COMPANY LIMITED | Private company limited by shares | Dissolved |
| SYDENHAM INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| SYDEX LIMITED | Private company limited by shares | Live |
| SYDL TRADE LIMITED | Private company limited by shares | Live |
| SYDMATECH LIMITED | | Live |
| SYDNEY LIMITED | Private company limited by shares | Live |
| SYDS SOLEIL LIMITED | Private company limited by shares | Live |
| Sydsam HK Limited | Private company limited by shares | Live |
| SYDYEX INTERNATIONAL CO., LIMITED | Private company limited by shares | Dissolved |
| SYEDHUAHUI LIMITED | Private company limited by shares | Live |
| GERMANY SYEETH GROUP LIMITED | Private company limited by shares | Dissolved |
| Syene Limited | Private company limited by shares | Live |
| Syenite Investment Limited | Private company limited by shares | Live |
| Syenron Limited | Private company limited by shares | Live |
| Syeric I&E Limited | Private company limited by shares | Live |
| Syetech Limited | | Live |
| SYF(HONGKONG) LIMITED | Private company limited by shares | Dissolved |
| SYFOLINK ICT LIMITED | Private company limited by shares | Live Commenced dormancy on 22-Jan-2010 |
| SYFOLINK INNOTECH LIMITED | Private company limited by shares | Dissolved |
| SYFOLINK INTERNATIONAL LIMITED | Private company limited by shares | Live Commenced dormancy on 31-Aug-2016 |
| SYFOLINK (ASIA PACIFIC) LIMITED | Private company limited by shares | Dissolved |
| SYFONET LIMITED | Private company limited by shares | Live |
| Syft (China) Limited | Private company limited by shares | Live |
| Syfy Limited | Private company limited by shares | Live |
| Sygardis Laboratories Company Limited | Private company limited by shares | Live |
| SYGMA SYSTEMS LIMITED | Private company limited by shares | Live |
| SYGMOS LIMITED | Private company limited by shares | Live |
| Sygnal E-commerce Limited | | Live |
| Sygnific Group Limited | Private company limited by shares | Live |
| SYGNUS MARINE (HK) LIMITED | Private company limited by shares | Live |
| SYGUARD INDUSTRIAL LIMITED | Private company limited by shares | Live |
| SYGUARD TECHNOLOGY LIMITED | Private company limited by shares | Live |
| HK S.Y.H LIMITED | Private company limited by shares | Live Commenced dormancy on 15-Aug-2018 |
| S.Y.H ENTERPRISE LIMITED | Private company limited by shares | Live |
| SYHANG CO. LIMITED | Private company limited by shares | Dissolved |
| SYHD ELECTRONIC CO., LIMITED | Private company limited by shares | Live |
| HK SYHDEE CO., LIMITED | Private company limited by shares | Dissolved |
| HK SYHDEE LIGHTING CO., LIMITED | Private company limited by shares | Live |
| SHENZHEN SYHDEE OPTOELECTRONICS TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| Syheng Industry Co., Limited | | Live |
| SYHM Limited | | Live |
| SYHT LIMITED | Private company limited by shares | Live |
| SYICO Limited | Private company limited by shares | Dissolved |
| Syida Co., Limited | | Live |
| SYIDA INTERNATIONAL CO., LIMITED | Private company limited by shares | Live |
| SYIDA INTERNATIONAL TRADE CO., LIMITED | Private company limited by shares | Live |
| S.Yin Education Limited | | Live |
| Syin (Hong Kong) Limited | | Live |
| SYINOT INDUSTRY CO., LIMITED | Private company limited by shares | Live |
| SyInvestments Limited | Private company limited by shares | Live |
| SYION LIMITED | Private company limited by shares | Dissolved |
| HK SYJH TRADE LIMITED | Private company limited by shares | Live |
| SYJJ COMMODITIES COMPANY LIMITED | Private company limited by shares | Live |
| SYJR Investment Company Limited | Private company limited by shares | Live |
| SY&K Consulting Limited | Private company limited by shares | Live |
| SYKAM (HK) SCIENTIFIC INSTRUMENT CO., LIMITED | Private company limited by shares | Live |
| SYKATON REAL ESTATE & TRADING COMPANY LIMITED | Private company limited by shares | Dissolved |
| SYKCHT LIMITED | Private company limited by shares | Live |
| SYKED LIMITED | Private company limited by shares | Dissolved |
| SYKELAY COMPANY LIMITED | Private company limited by shares | Dissolved |
| E. D. SYKES AND COMPANY, LIMITED | Private company limited by shares | Dissolved |
| SYKES COMPANY LIMITED | Private company limited by shares | Dissolved |
| SYKES INVESTMENT LIMITED | Private company limited by shares | Live |
| SYKES PUMPS LIMITED | Private company limited by shares | Dissolved |
| SHENZHEN SYKJ LIMITED | Private company limited by shares | Live |
| SYKL OF LIFE CHARITY FOUNDATION LIMITED | Company limited by guarantee | Live |
| SYKLON Technology Co., Limited | Private company limited by shares | Live |
| SYKO DESIGN LIMITED | Private company limited by shares | Dissolved |
| Sykon China Doors And Windows Curtain Wall System Co., Limited | Private company limited by shares | Live |
| SYKOO TECHNOLOGY (SHENZHEN) CO., LIMITED | Private company limited by shares | Dissolved |
| SYKT HOLDING LIMITED | Private company limited by shares | Live |
| SYLA TRADE LIMITED | | Live |
| S.Y.LAI LIMITED | | Live |
| SYLANA LIMITED | Private company limited by shares | Live |
| Sylance E-commerce Co., Limited | Private company limited by shares | Live |
| Syland Lighting Technology Company Limited | Private company limited by shares | Live |
| SYLANE FASHION HANDBAGS CO., LIMITED | Private company limited by shares | Live |
| SYLAR LIMITED | Private company limited by shares | Live |
| SYLAR HOLDING LIMITED | Private company limited by shares | Live |
| Sylar Technology Limited | Private company limited by shares | Live |
| SYLAS BEAUTI LIMITED | | Live |
| BEAUTY SYLAS LIMITED | | Live |
| SYLAS INTERNATIONAL TRADING LIMITED | | Live |
| SYLAX INDUSTRIAL COMPANY LIMITED | Private company limited by shares | Live |
| SYLAZ LIMITED | | Live |
| Sylbest International Co., Limited | Private company limited by shares | Live |
| Sylebra HK Company Limited | Private company limited by shares | Live |
| Sylenia Limited | Private company limited by shares | Dissolved |
| SYL(HK) TECHNOLOGY LIMITED | Private company limited by shares | Live |
| SYLI INTERNATIONAL INDUSTRY LIMITED | Private company limited by shares | Live |
| SYLINE CO. LIMITED | Private company limited by shares | Dissolved |
| SYLINGHIM LIMITED | Private company limited by shares | Live |
| SYLINGHIM TECH LIMITED | Private company limited by shares | Live |
| SYLINX LIMITED | Private company limited by shares | Live |
| Sylisiesy HK Limited | Private company limited by shares | Live |
| S.Y.L.K. INVESTMENTS LIMITED | Private company limited by shares | Live |
| SYLKOR INVESTMENT LIMITED | Private company limited by shares | Live |
| SYLLABLE INTELLIGENCE TECHNOLOGY (HONG KONG) LIMITED | Private company limited by shares | Live |
| SYLLABLES LIMITED | Private company limited by shares | Live |
| SYLMAR COMPANY LIMITED | Private company limited by shares | Dissolved |