| HONG KONG SYNTHETIC PAPER PACKAGING LIMITED | Private company limited by shares | Dissolved |
| MARBLE SYNTHETIC PRODUCTS LIMITED | Private company limited by shares | Dissolved |
| QUALITY SYNTHETIC RUBBER (HONG KONG) LIMITED | Private company limited by shares | Live |
| SING TAI SYNTHETIC DYEING & FINISHING COMPANY, LIMITED | Private company limited by shares | Dissolved |
| SING LEE SYNTHETIC FLOWER LIMITED | Private company limited by shares | Dissolved |
| SING LEE SYNTHETIC FLOWER FACTORY LIMITED | Private company limited by shares | Dissolved |
| Sino Synthetic Rubber Holdings Limited | Private company limited by shares | Live |
| SINTEX SYNTHETIC FABRICS LIMITED | Private company limited by shares | Live |
| CHARTERED SOCIETY OF SYNTHETIC PHYSIO THERAPY LIMITED -THE- | Private company limited by shares | Live |
| SOCIETY OF SYNTHETIC MANUAL PHYSIO THERAPISTS LIMITED -THE- | Private company limited by shares | Dissolved |
| SYNTHETIC SOLUTIONS LIMITED | Private company limited by shares | Live |
| China Synthetic Source Group Limited | | Live |
| SYNOCH SYNTHETIC MANUFACTORY LIMITED | Private company limited by shares | Dissolved |
| Synthetic Wind Technology Limited | | Live |
| WELLEN SYNTHETIC TEXTILE LIMITED | Private company limited by shares | Live |
| SYNTHETIC TEXTILES LIMITED | Private company limited by shares | Live |
| THERMO SYNTHETIC MATERIALS COMPANY LIMITED | Private company limited by shares | Dissolved |
| SYNTHETIC TRADING LIMITED | Private company limited by shares | Dissolved |
| UNITED SYNTHETIC NETTING & WEAVING FACTORY LIMITED | Private company limited by shares | Dissolved |
| VANQUISH HK SYNTHETIC CO. LIMITED | Private company limited by shares | Live |
| WINNER SYNTHETIC MONOFILAMENT LIMITED | Private company limited by shares | Dissolved |
| WINNET SYNTHETIC COMPANY LIMITED | Private company limited by shares | Live |
| SYNTHETIC-I (HK) LIMITED | Private company limited by shares | Live |
| TAIWAN JIXIANG ALUMINUM PLASTIC SYNTHETICS CO., LIMITED | Private company limited by shares | Dissolved |
| TAIWAN JIXIANG ALUMINUM PLASTIC SYNTHETICS CO., LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI JIXIANG ALUMINUM PLASTIC SYNTHETICS CO., LIMITED | Private company limited by shares | Dissolved |
| FUTURE SYNTHETICS LIMITED | Private company limited by shares | Live |
| STANDARD SYNTHETICS LIMITED | Private company limited by shares | Dissolved |
| SUNTEX SYNTHETICS LIMITED | Private company limited by shares | Dissolved |
| SYNTHETIK LIMITED | Private company limited by shares | Live |
| Synthex Limited | | Live |
| SYNTHIIZ LIMITED | | Live |
| Claves Synthis Pte Limited | Private company limited by shares | Live |
| SynthJoy Technology Limited | | Live |
| SynthMind AI Limited | | Live |
| Synthnova Limited | Private company limited by shares | Live |
| SYNTHOCHIRALS HONG KONG LIMITED | Private company limited by shares | Live |
| SYNTHON LIMITED | Private company limited by shares | Dissolved |
| SYNTHSS LIMITED | Private company limited by shares | Live |
| Synticate Limited | Private company limited by shares | Live |
| SYNTONE (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| Syntony Limited | Private company limited by shares | Live |
| SYNTOP LIMITED | Private company limited by shares | Dissolved |
| SYNTOP CO., LIMITED | Private company limited by shares | Live |
| SYNTOP (HONGKONG) CO., LIMITED | Private company limited by shares | Live |
| Syntop Technology Co., Limited | Private company limited by shares | Live |
| SYNTOR ASIA LIMITED | Private company limited by shares | Dissolved |
| SYNTRADE INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| SYNTRAL LIMITED | Private company limited by shares | Live |
| SYNTRAN (HONG KONG) COMPANY, LIMITED | Private company limited by shares | Dissolved |
| Syntrend Limited | | Live |
| SYNTRON LIMITED | Private company limited by shares | Dissolved |
| SYNTRON COMPANY LIMITED | Private company limited by shares | Dissolved |
| SYNTRON INC. LIMITED | Private company limited by shares | Live |
| Syntronics Company Limited | Private company limited by shares | Live |
| SYNTRONICS (HK) LIMITED | Private company limited by shares | Dissolved |
| SYNTRONIX INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| SYNTXT LIMITED | Private company limited by shares | Live |
| SYNTYPE INDUSTRY COMPANY LIMITED | Private company limited by shares | Live |
| SYNV INTERNATIONAL TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| SYNVA WORLDWIDE LIMITED | | Live |
| SynVest China Limited | Private company limited by shares | Dissolved |
| SYNVESTMENT CO., LIMITED | Private company limited by shares | Live |
| SYNWILL LIMITED | Private company limited by shares | Dissolved |
| SYNWIN ELECTRONICS LIMITED | Private company limited by shares | Live |
| Synwin Trading Company Limited | Private company limited by shares | Live |
| SYNWOODS LIMITED | Private company limited by shares | Live |
| SYNWOODS INTERNATIONAL LIMITED | Private company limited by shares | Live |
| SYNXIA PHOTONIC TECHNOLOGY LIMITED | Private company limited by shares | Live |
| Synxo Limited | Private company limited by shares | Dissolved |
| Synxpace Limited | Private company limited by shares | Live |
| SYOB COMPANY LIMITED | Private company limited by shares | Dissolved |
| Syohachi Management Limited | Private company limited by shares | Live |
| SYOHACHI MANAGEMENT (TSUEN WAN) LIMITED | Private company limited by shares | Live |
| FUJIKURA SYOJI (GROUP) LIMITED | Private company limited by shares | Dissolved |
| KYUHO SYOJI (HK) LIMITED | Private company limited by shares | Dissolved |
| MIWA SYOJI LIMITED | | Live |
| SOGO SYOJI CO., LIMITED | Private company limited by shares | Live |
| LEAD SYOKAI, KABUSHIKIKAISHA LIMITED | Private company limited by shares | Dissolved |
| Hong Kong Syoker Technologies Holding Limited | Private company limited by shares | Live |
| SYOLA LIMITED | Private company limited by shares | Dissolved |
| SYOMEI CONSULTING (H.K.) COMPANY LIMITED | Private company limited by shares | Live |
| TAIYO SYOMEI CONSULTING (HK) CO., LIMITED | Private company limited by shares | Live |
| SYON LIMITED | Private company limited by shares | Dissolved |
| Syon Limited | | Live |
| Syonanfuji Limited | | Live |
| SYOPTEK INTERNATIONAL LIMITED | Private company limited by shares | Live |
| Hong Kong Syoryuken Technology Co., Limited | Private company limited by shares | Live |
| SYOSIN LIMITED | Private company limited by shares | Live |
| SYOU WA (ASIA) ENTERPRISE LIMITED | Private company limited by shares | Dissolved |
| SYOU TRADE LIMITED | | Live |
| SYOUEI CORPORATION (HK) LIMITED | Private company limited by shares | Live |
| Hongkong syouei international trading Limited | Private company limited by shares | Live |
| NIPOU SYOUJI CO., LIMITED | Private company limited by shares | Live |
| YAMASHITA SYOUJI LIMITED | | Live |
| SYOUNAN MOULD LIMITED | Private company limited by shares | Live |
| SYOUNTEAM IND LIMITED | Private company limited by shares | Dissolved |
| SYOUNTIME INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| SYOUSIN CO., LIMITED | Private company limited by shares | Live |
| SYOWA ENTERPRISES (HONG KONG) COMPANY LIMITED | Private company limited by shares | Dissolved |