| Synetech Limited | Private company limited by shares | Live |
| SYNETIC HK LIMITED | Private company limited by shares | Live |
| SYNETOS LIMITED | Private company limited by shares | Live |
| SYNETT INFORMATION TECHNOLOGY (HK) LIMITED | Private company limited by shares | Live |
| SyneuRx Neuroscience HK Limited | Private company limited by shares | Live |
| SYNEWEALTH COMPANY LIMITED | Private company limited by shares | Dissolved |
| SYNEWS LIMITED | Private company limited by shares | Dissolved |
| SYNEX COMPANY LIMITED | Private company limited by shares | Dissolved |
| SYNEX CONSULTING LIMITED | Private company limited by shares | Dissolved |
| SYNEX GLOBAL TRADES LIMITED | Private company limited by shares | Live |
| SYNEX GROUP LIMITED | Private company limited by shares | Live |
| SYNEX INDUSTRIAL CO., LIMITED | Private company limited by shares | Live |
| SYNEX TECHNOLOGIES (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| SYNEXSER ASIA COMPANY LIMITED | Private company limited by shares | Live |
| Synext Service Limited | Private company limited by shares | Live |
| SYNEY ELEVATOR (HK) LIMITED | Private company limited by shares | Live |
| SYNF INTERNATIONAL CO., LIMITED | Private company limited by shares | Dissolved |
| SUN SYNFAX GARMENT FACTORY LIMITED | Private company limited by shares | Live |
| Synfine Biotech Limited | Private company limited by shares | Live |
| SYNFINE INGREDIENTS CO., LIMITED | Private company limited by shares | Live |
| SYNFLEX PACIFIC LIMITED | Private company limited by shares | Dissolved |
| SYNFUELS HONG KONG CO., LIMITED | Private company limited by shares | Live |
| HARP SYNGAS LIMITED | Private company limited by shares | Live |
| SYNGEAR SAFETY AND ENVIRONMENTAL CONSULTANTS COMPANY LIMITED | Private company limited by shares | Live |
| SYNGENTA LIMITED | Private company limited by shares | Live |
| SYNGLO (FAR EAST) COMPANY LIMITED | Private company limited by shares | Dissolved |
| Syngreen Limited | | Live |
| Syngtec Holdings Limited | Private company limited by shares | Live |
| Syngyn Limited | Private company limited by shares | Live |
| SYNICHE INDUSTRIAL CO. LIMITED | Private company limited by shares | Live |
| HONGKONG SYNID OFFICE CONSUMABLE CO., LIMITED | Private company limited by shares | Dissolved |
| HONGKONG SYNID IMPORT AND EXPORT CO., LIMITED | Private company limited by shares | Live |
| SYNIDEA ELECTRONICS CO., LIMITED | Private company limited by shares | Dissolved |
| SYNIGEA LIMITED | Private company limited by shares | Dissolved |
| Synigence Event Management Limited | Private company limited by shares | Live |
| Synigence Trading Company Limited | Private company limited by shares | Live |
| SYNIHAN LIMITED | Private company limited by shares | Live |
| SYNIKA ESTATE COMPANY LIMITED | Private company limited by shares | Dissolved |
| SYNIMUTH LIMITED | Private company limited by shares | Live |
| SYNITECH LIMITED | | Live |
| SYNIX HK LIMITED | Private company limited by shares | Live |
| Synking Technology Limited | Private company limited by shares | Live |
| SYNKO INTERNATIONAL GROUP CO., LIMITED | Private company limited by shares | Live |
| Synkory Limited | Private company limited by shares | Live |
| SYNKROTRON LIMITED | | Live |
| SYNKUAN TELECOM CORP. LIMITED | Private company limited by shares | Dissolved |
| SYNLETT HK LIMITED | Private company limited by shares | Live |
| SYNLIN PHARMACEUTICALS LIMITED | Private company limited by shares | Dissolved |
| SYNLINK HONGKONG LIMITED | Private company limited by shares | Live |
| SYNLINK TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| Synlinks Co., Limited | Private company limited by shares | Live |
| Synlong Trade Limited | | Live |
| SYNMAS TECHNOLOGY COMPANY LIMITED | Private company limited by shares | Live |
| SynMaster (Hong Kong) Technology Corporation Limited | Private company limited by shares | Live |
| Synmax Investments Limited | Private company limited by shares | Live |
| Syn-Medi Solutions Limited | Private company limited by shares | Live |
| SYNMERCO LIMITED | Private company limited by shares | Live |
| SHANGHAI SYNMIX ELECTRONICS COMPANY LIMITED | Private company limited by shares | Live |
| SYNMR INDUSTRY LIMITED | Private company limited by shares | Dissolved |
| PURE SYNMR INGREDIENTS LIMITED | Private company limited by shares | Live |
| SYNN INVESTMENT COMPANY LIMITED | Private company limited by shares | Live |
| SYNNET TECHNOLOGY (HK) LIMITED | Private company limited by shares | Dissolved |
| SYNNIUM MACHINERY LIMITED | Private company limited by shares | Live |
| SYNNIX (HONG KONG) LIMITED | Private company limited by shares | Live |
| SynNovation Consulting Limited | Private company limited by shares | Live |
| SYNO INTERNATIONAL CAPITAL LIMITED | Private company limited by shares | Dissolved |
| Syno Digital Limited | Private company limited by shares | Live |
| SYNO TECHNOLOGY (HONG KONG) CO., LIMITED | Private company limited by shares | Live |
| SYNO STAR INTERNATIONAL LIMITED | | Live |
| SYNO SYSTEM LIMITED | Private company limited by shares | Dissolved |
| SYNO TRADING CO., LIMITED | Private company limited by shares | Live |
| SYNOCO INC. LIMITED | Private company limited by shares | Dissolved |
| SynoCode Group Limited | Private company limited by shares | Live |
| SYNOCODE SOLUTIONS (HONG KONG) LIMITED | | Live |
| SYNOFLO LIMITED | Private company limited by shares | Dissolved |
| Guangzhou Synogal Electronic Equipemrnt Limited | | Live |
| Synolux Corp. Limited | Private company limited by shares | Dissolved |
| Synomac Marine Engineering Co., Limited | Private company limited by shares | Live |
| SYNOMED HEALTH LIMITED | Private company limited by shares | Dissolved |
| SYNON (HONGKONG) INT'L HAIR SUPPLIES UTENSILS CO., LIMITED | Private company limited by shares | Dissolved |
| SYNONE INTERNATIONAL CO., LIMITED | Private company limited by shares | Dissolved |
| Synontem Limited | Private company limited by shares | Live |
| SYNOPOLY LIMITED | Private company limited by shares | Live |
| SYNOPSIS CONSULTING LIMITED | Private company limited by shares | Live |
| SYNOPSIS LATEST LIMITED | Private company limited by shares | Live |
| SYNOPSIS TECHNOLOGIES HK LIMITED | Private company limited by shares | Live |
| SYNOPSYS LIMITED | Private company limited by shares | Live |
| Synopsys Hong Kong Limited | Private company limited by shares | Live |
| Synopsys China Capital (Hong Kong) Company Limited | Private company limited by shares | Live |
| Synora Logistics Limited | Private company limited by shares | Live |
| SYNOREN LIMITED | Private company limited by shares | Live |
| Synortic Technology Limited | Private company limited by shares | Live |
| SYNOS HK LIMITED | | Live |
| SynoSmart Limited | Private company limited by shares | Live |
| SYNOTECH LIMITED | Private company limited by shares | Dissolved |
| SYNOTEK LIMITED | Private company limited by shares | Live |
| SYNOTEX ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| SYNOVATE LIMITED | Private company limited by shares | Live |
| Creative Synovate Market Research Company Limited | | Live |
| SYNOVE LIMITED | Private company limited by shares | Live |