| CYRANO TRADING COMPANY LIMITED | Private company limited by shares | Dissolved |
| CYRCADIA ASIA LIMITED | Private company limited by shares | Live |
| Cyrean Limited | Private company limited by shares | Live |
| CYRENE LIMITED | Private company limited by shares | Live |
| CYREX COMPANY LIMITED | Private company limited by shares | Dissolved |
| CYRIELLE M LIMITED | Private company limited by shares | Live |
| Cyright Group HongKong Limited | | Live |
| CYRIL Limited | Private company limited by shares | Live |
| Cyril Sweett HK Limited | Private company limited by shares | Dissolved |
| SIR CYRIL YOUNG AND SON LIMITED | Private company limited by shares | Dissolved |
| CYRILSON LIMITED | Private company limited by shares | Dissolved |
| Cyris Trading Limited | Private company limited by shares | Live |
| CYRIUS LIMITED | Private company limited by shares | Dissolved |
| CYRIX CORPORATION LIMITED | Private company limited by shares | Live |
| Cyrix Technologies Limited | Private company limited by shares | Dissolved |
| CYRK ASIA LIMITED | Private company limited by shares | Dissolved |
| CYRO PACIFIC LIMITED | Private company limited by shares | Dissolved |
| CYROCK CAPITAL LIMITED | Private company limited by shares | Live |
| Cyrofx Limited | | Live |
| CYROGEN PHARMED LIMITED | Private company limited by shares | Live |
| Cyron Corporation Pte Limited | Private company limited by shares | Dissolved |
| Cyron International Group Co., Limited | Private company limited by shares | Live |
| CYRON MEDIA LIMITED | Private company limited by shares | Dissolved |
| FLAIR CYROSIL INDUSTRY PVT LIMITED | Private company limited by shares | Live |
| CYRSTAL FAIR INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| CYRTOMIUM CHINA LIMITED | Private company limited by shares | Dissolved |
| CYRUS LIMITED | Private company limited by shares | Dissolved |
| Cyrus Company Limited | Private company limited by shares | Dissolved |
| Cyrus Lee Limited | Private company limited by shares | Live |
| CYRUS 43 LIMITED | | Live |
| CYRUS LIU 43 LIMITED | | Live |
| CYRUS 38 LIMITED | | Live |
| CYRUS 39 LIMITED | | Live |
| CYRUS 40 LIMITED | | Live |
| CYRUS 41 LIMITED | | Live |
| CYRUS 42 LIMITED | | Live |
| CYRUS 44 LIMITED | | Live |
| CYRUS 45 LIMITED | | Live |
| CYRUS 46 LIMITED | | Live |
| CYRUS 47 LIMITED | | Live |
| CYRUS 48 LIMITED | | Live |
| Rock Cyrus Limited | | Live |
| C.Y.S. ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| CYSC COMPANY LIMITED | Private company limited by shares | Live |
| Cysco HK Limited | Private company limited by shares | Live |
| CYSD TECHNOLOGY LIMITED | | Live |
| HONG KONG CYSEA INTERNATIONAL TRADE CO., LIMITED | Private company limited by shares | Live |
| Cysec Limited | Private company limited by shares | Live |
| SAFECAP (CYSEC) LIMITED | Private company limited by shares | Live |
| CYSECURITY ELECTRONIC LIMITED | Private company limited by shares | Live |
| CYSL ENGINEERING LIMITED | | Live |
| Cyson Advisors Limited | | Live |
| CYSPO TECHNOLOGY (HONGKONG) CO., LIMITED | Private company limited by shares | Live |
| CYSTAGELIGHT HK LIMITED | Private company limited by shares | Live |
| CYSTAL ON ENTERPRISE LIMITED | Private company limited by shares | Live |
| CYSTAL PLACE INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| CYSTECH ELECTRONICS (HK) LIMITED | Private company limited by shares | Dissolved |
| CYSTM LIMITED | Private company limited by shares | Live |
| cystron technology Limited | Private company limited by shares | Live |
| CYSW CONSULTING LIMITED | Private company limited by shares | Live |
| C.Y.S.W.L. LIMITED | Private company limited by shares | Live |
| CYTAC TECHNOLOGY LIMITED | Private company limited by shares | Live |
| CYTAS TRADING COMPANY LIMITED | Private company limited by shares | Dissolved |
| CYT.B LIMITED | Private company limited by shares | Live |
| CYTE LIMITED | Private company limited by shares | Dissolved |
| CYTea Company Limited | | Live |
| CYTECH LIMITED | Private company limited by shares | Dissolved |
| Cytek Limited | Private company limited by shares | Live |
| CYTEL (CHINA) LIMITED | Private company limited by shares | Live |
| Cytel (Hong Kong) Limited | Private company limited by shares | Live |
| Cytenium Consulting Services Limited | Private company limited by shares | Live |
| CyteTherapeutics Co. Limited | Private company limited by shares | Live |
| CYTEZ COMPANY LIMITED | Private company limited by shares | Dissolved |
| CYTH INTERNATIONAL LIMITED | Private company limited by shares | Live |
| CYTHEREA LIMITED | Private company limited by shares | Live |
| CYTHK (HONG KONG) SHIPPING LIMITED | | Live |
| Cytic International Limited | Private company limited by shares | Live |
| CYTIK COMPANY LIMITED | Private company limited by shares | Dissolved |
| CHINA CYTOBIO (CCB) CO., LIMITED | Private company limited by shares | Dissolved |
| Cytochondria International Trade Limited | Private company limited by shares | Live |
| Hong Kong International CytoMed Technology Company Limited | | Live |
| HK RUNSHENG CYTOMED TECHNOLOGY LIMITED | Private company limited by shares | Live |
| CYTOMED THERAPEUTICS CHINA LIMITED | | Live |
| CYTOMICS LIMITED | Private company limited by shares | Live |
| Hong Kong CytoSol Biopharma Company Limited | Private company limited by shares | Live |
| Shenzhen Cytouch Electronics Limited | Private company limited by shares | Live |
| Cytowake HK Limited | Private company limited by shares | Live |
| CYTOWISE LIMITED | Private company limited by shares | Live |
| CYTOZYME ASIA LIMITED | Private company limited by shares | Dissolved |
| CYTOZYME FAR EAST AND CHINA LIMITED | Private company limited by shares | Dissolved |
| CYTOZYME LABORATORIES LIMITED | Private company limited by shares | Dissolved |
| CYTRAN TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| CYTRONICS LIMITED | Private company limited by shares | Dissolved |
| CYTRONICS COMPANY LIMITED | Private company limited by shares | Live |
| Cytrus (HK) Limited | Private company limited by shares | Live |
| CYTse Limited | | Live |
| CYTS-OCEANIA LIMITED | Private company limited by shares | Live |
| CYTUNG LIMITED | | Live |
| CYTWHK LIMITED | Private company limited by shares | Live |
| HONGKONG CYTX TRAVEL LIMITED | Private company limited by shares | Live |