| S.Y.S YOSHIDA (HONG KONG) CO., LIMITED | Private company limited by shares | Live |
| SY'S Global Limited | | Live |
| SY'S ELECTRONIC AND PLASTIC INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| S.Y.S PUNCTUATION INDUSTRIAL CO., LIMITED | Private company limited by shares | Dissolved |
| ICS (Inter-China Sys) Logistics Co., Limited | Private company limited by shares | Live |
| SYS8 IP LIMITED | Private company limited by shares | Live |
| SYSAN LIMITED | Private company limited by shares | Live |
| SYSBEST LIMITED | Private company limited by shares | Live |
| SYSBIOLOGY HONG KONG LIMITED | Private company limited by shares | Live |
| SYSCAN INTERVISION LIMITED | Private company limited by shares | Dissolved |
| SYSCAN LAB., LIMITED | Private company limited by shares | Dissolved |
| SYSCO LIMITED | Private company limited by shares | Dissolved |
| SYSCO LIMITED | Private company limited by shares | Dissolved |
| Sysco HK Limited | Private company limited by shares | Live |
| SYSCO INVESTMENT LIMITED | Private company limited by shares | Live |
| SYSCOM COMPANY LIMITED | Private company limited by shares | Dissolved |
| Syscom Group Limited | Private company limited by shares | Live |
| SYSCOM HONG KONG LIMITED | Private company limited by shares | Dissolved |
| Syscom Hong Kong Limited | | Live |
| SYSCOM INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| SYSCOM INTERNATIONAL LIMITED | Private company limited by shares | Live |
| SYSCOM INTERNATIONAL GROUP LIMITED | Private company limited by shares | Live |
| Syscom Networks Limited | Private company limited by shares | Live |
| SYSCOM TECHNOLOGY LIMITED | Private company limited by shares | Live |
| SYSCOM CYBER TELECOMMUNICATION LIMITED | Private company limited by shares | Dissolved |
| SYSCOM-ELECTRONICS LIMITED | Private company limited by shares | Live |
| SYSCON LIMITED | | Live |
| SysConf Limited | Private company limited by shares | Live |
| SHANGHAI SYSCOPE LIMITED | Private company limited by shares | Dissolved |
| SYSCOPE TECHNOLOGY LIMITED | Private company limited by shares | Live |
| Syscore International Co., Limited | Private company limited by shares | Live |
| Syscore Energy, Limited | Private company limited by shares | Live |
| SYSCORP SOLUTIONS LIMITED | Private company limited by shares | Live |
| SYSCOTECH LIMITED | Private company limited by shares | Dissolved |
| SYSCRIBES SOLUTIONS PRIVATE LIMITED | Private company limited by shares | Live |
| SYSD LIMITED | Private company limited by shares | Live |
| Sysdelivery Limited | Private company limited by shares | Live |
| SYSDREAM ASIA LIMITED | Private company limited by shares | Dissolved |
| Sysdrinking Limited | Private company limited by shares | Dissolved |
| SYSDYNAMIC LIMITED | Private company limited by shares | Dissolved |
| sysfanclub Company Limited | Private company limited by shares | Live |
| SYSGEN PACIFIC LIMITED | Private company limited by shares | Dissolved |
| SYSHAN CAPITAL LIMITED | Private company limited by shares | Live |
| SYSHOLIC LIMITED | Private company limited by shares | Live |
| Sysiaco Eximtra Holdings (HK) Limited | Private company limited by shares | Live |
| SYSKALI LIMITED | Private company limited by shares | Live |
| SYSLANCE TECHNOLOGY SERVICES LIMITED | Private company limited by shares | Live |
| SYSLINK LIMITED | Private company limited by shares | Live |
| SYSLINK HK LIMITED | Private company limited by shares | Live |
| SYSLINK SYSTEMS CONSULTANTS LIMITED | Private company limited by shares | Dissolved |
| SYSLINK (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| SYSLINK INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| SYSLINK INTERNATIONAL CO., LIMITED | Private company limited by shares | Live |
| SYSLINK ASIA PACIFIC LIMITED | Private company limited by shares | Live |
| SYS-LINK TECHNOLOGY COMPANY LIMITED | Private company limited by shares | Live |
| SYSLINTEC LIMITED | Private company limited by shares | Live |
| SYSLOGIC LIMITED | Private company limited by shares | Dissolved |
| SysLogic Company Limited | Private company limited by shares | Live |
| SYSLON (ASIA) LIMITED | Private company limited by shares | Live |
| SYSMA INTERNATIONAL TRADING CORPORATION (H.K.) LIMITED | Private company limited by shares | Live |
| SYSMAC COMPANY LIMITED | Private company limited by shares | Dissolved |
| SYSMAGIC SOFTWARE SOLUTION COMPANY LIMITED | Private company limited by shares | Live |
| SYSMAN LIMITED | Private company limited by shares | Dissolved |
| Sysmart Limited | Private company limited by shares | Live |
| SYSMARTS INDUSTRIAL LIMITED | | Live |
| SYSMATIC LIMITED | Private company limited by shares | Dissolved |
| SYSMATIC SOLUTIONS LIMITED | Private company limited by shares | Live |
| SYSMAX LIMITED | Private company limited by shares | Dissolved |
| SYSMAX LIMITED | Private company limited by shares | Dissolved |
| SYSMAX INDUSTRY TRADING COMPANY LIMITED | Private company limited by shares | Live |
| SYSMAX INTERNATIONAL LIMITED | Private company limited by shares | Live |
| SYSMAX TECHNOLOGY LIMITED | Private company limited by shares | Live |
| SYSMED HOMECARE INTERNATIONAL LIMITED | Private company limited by shares | Live |
| Sysnance Limited | Private company limited by shares | Live |
| SYSNET DATA CO. LIMITED | Private company limited by shares | Live |
| SYSNET GLOBAL LIMITED | Private company limited by shares | Dissolved |
| SYSNETS TECHNOLOGY (HK) LIMITED | Private company limited by shares | Live |
| SYSNETZ LIMITED | Private company limited by shares | Dissolved |
| SYSNIX (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| Sysnosys Technology Co., Limited | Private company limited by shares | Live |
| SYSO ENTERPRISES & CO LIMITED | Private company limited by shares | Dissolved |
| SYSOFT LIMITED | Private company limited by shares | Dissolved |
| SYS-OLOGY HONG KONG LIMITED | Private company limited by shares | Live |
| Sylvie & Syson Limited | | Live |
| SysOp Limited | Private company limited by shares | Live |
| SYSPARK I.CENTRE, LIMITED | Private company limited by shares | Live |
| Syspedia Technology Inc Limited | Private company limited by shares | Live |
| Sysplan Company Limited | Private company limited by shares | Dissolved |
| SYSPO INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| SYSPOWER LIMITED | Private company limited by shares | Dissolved |
| SYSPRO LIMITED | Private company limited by shares | Dissolved |
| SYSPRO (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| SYS-PRO INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| Sysqon Solutions Limited | Private company limited by shares | Dissolved |
| SYSRIFE COMPANY LIMITED | Private company limited by shares | Live |
| SYSROAD POWER INDUSTRIAL LIMITED | Private company limited by shares | Live |
| SYSSOFT LIMITED | Private company limited by shares | Live |
| Systal Technology Solutions Limited | | Live |
| Systans International Trading Company | | Live |
| SYSTCOM INVESTMENTS LIMITED | Private company limited by shares | Dissolved |