| SYMPHONY TECHNOLOGY LIMITED | Private company limited by shares | Live |
| SYMPHONY TRADING COMPANY LIMITED | | Live |
| Symphony Trading and Investments Limited | Private company limited by shares | Live |
| Symphony Tree Limited | Private company limited by shares | Live |
| SymphonyEYC HK Limited | Private company limited by shares | Live |
| SYMPHYSODON LIMITED | Private company limited by shares | Live |
| Symple International Co., Limited | Private company limited by shares | Live |
| SYMPLISTIC TECHNOLOGIES LIMITED | Private company limited by shares | Dissolved |
| Symploke International Limited | Private company limited by shares | Live |
| Symponova Limited | | Live |
| AFFINITY SYMPOSIA COMPANY LIMITED | Private company limited by shares | Dissolved |
| SYMPOSIA ON PHILOSOPHICAL STUDIES OF HUMAN RIGHTS ASSOCIATION LIMITED | Company limited by guarantee | Live |
| Symposium Limited | Private company limited by shares | Live |
| HONG KONG WEB SYMPOSIUM CONSORTIUM LIMITED -THE- | Company limited by guarantee | Live |
| ORTHODONTIC SYMPOSIUMS LIMITED | Private company limited by shares | Dissolved |
| SYMPS CO., LIMITED | Private company limited by shares | Dissolved |
| SYMR LIMITED | Private company limited by shares | Dissolved |
| SYMRISE LIMITED | Private company limited by shares | Dissolved |
| SYMRISE EXPORT LIMITED | Private company limited by shares | Dissolved |
| SYMS CONTAINER LINE AGENCIES (HK) LIMITED | Private company limited by shares | Dissolved |
| SYMSON TECHNOLOGY LIMITED | Private company limited by shares | Live |
| SYMSUM CORPORATION LIMITED | Private company limited by shares | Live |
| SYMTEC LIMITED | Private company limited by shares | Dissolved |
| Symtech Co., Limited | Private company limited by shares | Live |
| SYMTECH SOLAR CO., LIMITED | Private company limited by shares | Live |
| SYMTECH SOLAR GROUP LIMITED | Private company limited by shares | Live |
| SYMTECH-PLUS LIMITED | Private company limited by shares | Live |
| SymTek China Limited | Private company limited by shares | Live |
| WILKINS & SYMTHE PROCESS TECHNOLOGIES LIMITED | Private company limited by shares | Live |
| SYMTO LIMITED | Private company limited by shares | Dissolved |
| SYMTON LIMITED | Private company limited by shares | Dissolved |
| SymVision Technology (H.K.) Co., Limited | Private company limited by shares | Live |
| Symvisions Limited | Private company limited by shares | Live |
| SYMY LIMITED | | Live |
| SYMYS LIMITED | Private company limited by shares | Live |
| Syn3D Technology Limited | | Live |
| SYNAA COLLECTION LIMITED | Private company limited by shares | Dissolved |
| SYNAE MICRO-ELECTRONICS (HK) CO., LIMITED | Private company limited by shares | Dissolved |
| SYNAESTHETICS CREATIVE LIMITED | Private company limited by shares | Live |
| SYNAMIC HAB LIMITED | Private company limited by shares | Live |
| Synamic Technology Limited | Private company limited by shares | Live |
| SYNANDRA LIMITED | Private company limited by shares | Dissolved |
| MYO Synanto Limited | Private company limited by shares | Live |
| SYNAPS LIMITED | Private company limited by shares | Live |
| SYNAPSE COMPANY LIMITED | Private company limited by shares | Live |
| Arc Synapse Limited | Private company limited by shares | Live |
| Synapse Asia Limited | Private company limited by shares | Live |
| Synapse Software (Asia) Limited | Private company limited by shares | Live |
| Synapse Capital Limited | Private company limited by shares | Live |
| SYNAPSE (CHINA) LIMITED | Private company limited by shares | Live |
| SYNAPSE CONSULTING LIMITED | Private company limited by shares | Live |
| SYNAPSE FINANCIAL TECHNOLOGIES LIMITED | Private company limited by shares | Live |
| SYNAPSE GROUP LIMITED | Private company limited by shares | Dissolved |
| SYNAPSE INVESTMENT LIMITED | Private company limited by shares | Live |
| Synapse Design Automation (Hong Kong) Limited | Private company limited by shares | Live |
| SYNAPSE LOGIC PTE LIMITED | Private company limited by shares | Live |
| Synapse Capital Management Limited | Private company limited by shares | Live |
| Synapse Health Management Limited | Private company limited by shares | Live |
| SYNAPSE MEDICAL CENTRE LIMITED | Private company limited by shares | Live |
| SYNAPSE MICROELECTRONICS LIMITED | Private company limited by shares | Dissolved |
| Synapse Network Company Limited | Private company limited by shares | Live |
| SYNAPSE PACIFIC LIMITED | Private company limited by shares | Dissolved |
| SYNAPSE TECH COMPANY LIMITED | Private company limited by shares | Live |
| Synapse Technology Company Limited | Private company limited by shares | Live |
| SYNAPSE THERAPEUTICS LIMITED | Private company limited by shares | Live |
| SYNAPSEWORLD LIMITED | Private company limited by shares | Dissolved |
| SYNAPSIS CONSULTING LIMITED | Private company limited by shares | Live |
| SYNAPSIS INDUSTRIAL CO., LIMITED | Private company limited by shares | Dissolved |
| SYNAPSYS CONSULTING LIMITED | Private company limited by shares | Dissolved |
| SYNAPTIC GAP LIMITED | Private company limited by shares | Live |
| SYnapTiK Limited | Private company limited by shares | Dissolved |
| HK Synaptogen Limited | | Live |
| Maeandere SynapxCardz Limited | Private company limited by shares | Live |
| SYNAPZES CREATION LIMITED | Private company limited by shares | Live |
| SYNASIA LIMITED | Private company limited by shares | Live |
| SYNATEC CO., LIMITED | Private company limited by shares | Dissolved |
| Synative Limited | Private company limited by shares | Live |
| Synaty Limited | Private company limited by shares | Live |
| Synauto Co., Limited | | Live |
| SYNAX HOLDING LIMITED | Private company limited by shares | Live |
| HYEA SYNBIO CO., LIMITED | | Live |
| SYNBIO PHARMA LIMITED | Private company limited by shares | Live |
| Synbo Limited | | Live |
| Synbonray Limited | Private company limited by shares | Live |
| SPAIN SYNBOTANLX COMPANY LIMITED | Private company limited by shares | Live |
| CNAC (HK) SYNBRIDGE COMPANY LIMITED | Private company limited by shares | Live |
| SynBright Limited | Private company limited by shares | Live |
| SYNBROAD INVESTMENT LIMITED | Private company limited by shares | Live |
| LLP SYNC LIMITED | Private company limited by shares | Live |
| Q Sync Limited | Private company limited by shares | Live |
| DIGITAL SYNC H.K COMPANY LIMITED | Private company limited by shares | Live |
| SYNC INNOVATIONS LIMITED | Private company limited by shares | Live |
| Kitchen Sync Limited | Private company limited by shares | Live |
| SYNC MODE LIMITED | Private company limited by shares | Dissolved |
| SYNC SYSTEM LIMITED | Private company limited by shares | Live |
| Sync-channel Limited | Private company limited by shares | Live |
| SYNCCHIC (HK) LIMITED | Private company limited by shares | Live |
| SYNCCO LIMITED | Private company limited by shares | Dissolved |
| Sync-ed Technology Limited | Private company limited by shares | Live |
| Syncflo International Limited | Private company limited by shares | Live |