| Construction Sector Imported Labour Quarters Limited | | Live |
| Sector Corporation Limited | | Live |
| Design Sector Limited | Private company limited by shares | Live |
| SECTOR DEVELOPMENTS LIMITED | Private company limited by shares | Dissolved |
| BEST SECTOR DEVELOPMENTS LIMITED | Private company limited by shares | Live |
| SECTOR ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| PRIVATE SECTOR COMMITTEE ON THE ENVIRONMENT | Company limited by guarantee | Dissolved |
| CHINA SECTOR ESTABLISHMENT LIMITED | Private company limited by shares | Dissolved |
| FREE SECTOR LIMITED | Private company limited by shares | Dissolved |
| GAIN SECTOR LIMITED | Private company limited by shares | Dissolved |
| GOLDEN SECTOR LIMITED | Private company limited by shares | Live |
| GOLDEN SECTOR AGRO-DEVELOPMENT LIMITED | Private company limited by shares | Live |
| GRAND SECTOR LIMITED | Private company limited by shares | Live |
| GROUP SECTOR LIMITED | Private company limited by shares | Dissolved |
| SECTOR GROUP LIMITED | Private company limited by shares | Live |
| HK SOCIAL WELFARE SECTOR HEART TO HEART JOINT ACTION LIMITED | | Live |
| Home Sector Company Limited | Private company limited by shares | Dissolved |
| PROFESSIONAL VALIDATION CENTRE OF HONG KONG BUSINESS SECTOR LIMITED -THE- | Company limited by guarantee | Live |
| Hong Kong Business Sector Poll Survey Limited | Private company limited by shares | Live |
| HONG KONG IT SECTOR (NATIONAL DAY CELEBRATION) LIMITED | Private company limited by shares | Live |
| HONG KONG FEDERATION OF CHINESE MEDICINE SECTOR LIMITED -THE- | Company limited by guarantee | Live |
| HONG KONG PUBLIC SECTOR ACCOUNTANTS ASSOCIATION LIMITED | | Live |
| HONG KONG TECHNOLOGY AND INNOVATION SECTOR (NATIONAL DAY CELEBRATION) LIMITED | | Live |
| HONG KONG SCIENCE AND TECHNOLOGY SECTOR FOR CELEBRATION OF RETURN OF SOVEREIGNTY ASSOCIATION LIMITED | Company limited by guarantee | Dissolved |
| EAST SECTOR INTERNATIONAL LIMITED | Private company limited by shares | Live |
| CFC INTERNATIONAL EQUESTRIAN SECTOR LIMITED | Private company limited by shares | Live |
| SECOND SECTOR INTERNATIONAL LIMITED | Private company limited by shares | Live |
| Sector Investment Limited | | Live |
| BEST SECTOR INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| LINK SECTOR INVESTMENTS LIMITED | Private company limited by shares | Live |
| INTERNATIONAL NAVIGATION SECTOR & MARINE SERVICES (I.N.S. LTD) LIMITED | Private company limited by shares | Live |
| MILLION SECTOR LIMITED | Private company limited by shares | Dissolved |
| MORELLATO & SECTOR LIMITED | Private company limited by shares | Live |
| ORIENT SECTOR LIMITED | Private company limited by shares | Live |
| ORIENT SECTOR LIMITED | Private company limited by shares | Live |
| SECTOR PACIFIC LIMITED | Private company limited by shares | Live |
| CHINA PRIMARY SECTOR PRODUCTS TRADING LIMITED | Private company limited by shares | Live |
| SAFE SECTOR LIMITED | Private company limited by shares | Live |
| SECOND SECTOR COMPANY LIMITED -THE- | Private company limited by shares | Live |
| SECTOR TRADING LIMITED | Private company limited by shares | Dissolved |
| TRUE SECTOR LIMITED | Private company limited by shares | Dissolved |
| SECTORIA (HK) COMPANY LIMITED | Private company limited by shares | Live |
| SECTORPLACE LIMITED | Private company limited by shares | Dissolved |
| Sectra Limited | Private company limited by shares | Live |
| Sectra Asia Limited | | Live |
| SECTRA ASIA INVESTMENT LIMITED | | Live |
| SECTRUM TRADE & DEVELOPMENT (HK) CO., LIMITED | Private company limited by shares | Live |
| SECTUM LIMITED | Private company limited by shares | Dissolved |
| SECTWOOD LIMITED | Private company limited by shares | Dissolved |
| SecuArt Limited | | Live |
| SecuBase Limited | Private company limited by shares | Live |
| Secuco Technology Co., Limited | Private company limited by shares | Live |
| Secueon Technology Limited | Private company limited by shares | Live |
| SECUEX TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| ISS Adams Secuforce Limited | Private company limited by shares | Live |
| ADAMS SECUFORCE (CHINA) LIMITED | Private company limited by shares | Dissolved |
| CHI KO SECUFORCE (HK) LIMITED | Private company limited by shares | Dissolved |
| SecuFuture Limited | Private company limited by shares | Live |
| SECUGEN ASIA, LIMITED | Private company limited by shares | Dissolved |
| SECUGIS (HOLDINGS) LIMITED | Private company limited by shares | Dissolved |
| SECUGREEN (ASIA) CORPORATION LIMITED | Private company limited by shares | Dissolved |
| SECUGUARDER LIMITED | Private company limited by shares | Live |
| SECULAR COMPANY LIMITED | Private company limited by shares | Dissolved |
| SECULAR COMPANY LIMITED | Private company limited by shares | Live |
| SECULAR TECHNOLOGY COMPANY LIMITED | Private company limited by shares | Dissolved |
| SecularZen Company Limited | Private company limited by shares | Dissolved |
| SECULINK TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| Seculink Technology (HK) Limited | Private company limited by shares | Live |
| SecuLumi Limited | Private company limited by shares | Live |
| SecuNet Limited | Private company limited by shares | Live |
| SECUNEX TECHNOLOGY COMPANY LIMITED | Private company limited by shares | Live |
| Secuority Technology Co., Limited | Private company limited by shares | Live |
| SECURA INTERNATIONAL PTE LIMITED | Private company limited by shares | Live |
| SECURA MONDE LIMITED | Private company limited by shares | Live |
| SECURA TECHNOLOGIES (H.K.) LIMITED | Private company limited by shares | Dissolved |
| SECURAIR LIMITED | Private company limited by shares | Dissolved |
| Securamark Limited | Private company limited by shares | Live |
| Securambo Limited | | Live |
| SECUR'ASIA LIMITED | Private company limited by shares | Live |
| Securat Limited | | Live |
| SECURDENTA LIMITED | Private company limited by shares | Live |
| U S SECURE COMPANY LIMITED | Private company limited by shares | Live |
| SECURE LIMITED | Private company limited by shares | Dissolved |
| VR SECURE LIMITED | Private company limited by shares | Dissolved |
| LAN SECURE LIMITED | Private company limited by shares | Dissolved |
| V SECURE LIMITED | Private company limited by shares | Live |
| Secure Net Limited | Private company limited by shares | Live |
| SECURE LIMITED | Private company limited by shares | Live |
| SKY SECURE LIMITED | | Live |
| SECURE SUN LIMITED | | Live |
| SECURE ADVANCEMENT LIMITED | | Live |
| Ashna secure Limited | Private company limited by shares | Live |
| SECURE ASIA LIMITED | Private company limited by shares | Live |
| Secure Billing Limited | | Live |
| SECURE WIN ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| SECURE FREIGHT SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| SECURE GAIN LIMITED | Private company limited by shares | Live |
| SECURE GRACE LIMITED | | Live |
| SECURE HAPPY LIMITED | Private company limited by shares | Dissolved |
| GCC SECURE HOLDING LIMITED | Private company limited by shares | Live |