| HKUB COMPANY LIMITED | Private company limited by shares | Dissolved |
| HKUCAS Limited | Private company limited by shares | Live |
| HKUE LIMITED | Private company limited by shares | Live |
| HKU-GREAT EDUCATION PUBLISHING LIMITED | Private company limited by shares | Live |
| HKUK Education Limited | Private company limited by shares | Live |
| WGC HKUK TRADING LIMITED | Private company limited by shares | Live |
| HKumquat Hut Wine Limited | | Live |
| H.K.UNITE TRADE GROUP LIMITED | Private company limited by shares | Live |
| H.KUROMI LIMITED | | Live |
| MK HKUS COMPANY LIMITED | Private company limited by shares | Dissolved |
| HKUS Limited | Private company limited by shares | Live |
| PRO-DIVE (H.K.-U.S.A.) LIMITED | Private company limited by shares | Live |
| PSAI (H.K.-U.S.A.) CO. LIMITED | Private company limited by shares | Live |
| HKUST INNOVATION LIMITED | Private company limited by shares | Live |
| HKUST INNOVATION LIMITED | Private company limited by shares | Live |
| HKUST PROPERTIES LIMITED | Private company limited by shares | Live Commenced dormancy on 17-May-1995 |
| Hkutpay Limited | | Live |
| HKUYA STUDENT EXCHANGE NETWORK COMPANY LIMITED | Company limited by guarantee | Live |
| HKU/ZSU CHINA TRADE AND INVESTMENT STUDENTS ALUMNI LIMITED | Company limited by guarantee | Dissolved |