| WESTPAC LIMITED | Private company limited by shares | Dissolved |
| WESTPAC LIMITED | Private company limited by shares | Live |
| WestPac Capital Investment Co., Limited | Private company limited by shares | Live |
| WESTPAC TECHNOLOGY COMPUTERS LIMITED | Private company limited by shares | Dissolved |
| WESTPAC DIGITAL LIMITED | Private company limited by shares | Live |
| WESTPAC ELECTRONICS LIMITED | Private company limited by shares | Live |
| WESTPAC ENERGY (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| WESTPAC (HK) LIMITED | Private company limited by shares | Live |
| WESTPAC FINANCE (HK) LIMITED | Private company limited by shares | Live |
| Westpac Holdings (Group) Limited | Private company limited by shares | Dissolved |
| WESTPAC INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| WESTPAC LEASING ASIA LIMITED | Private company limited by shares | Dissolved |
| WESTPAC PRODUCTS COMPANY LIMITED | Private company limited by shares | Live |
| WESTPAC RESOURCES COMPANY LIMITED | Private company limited by shares | Live |
| WESTPAC SALES LIMITED | Private company limited by shares | Dissolved |
| WESTPAC ASIA (SECURITIES) LIMITED | Private company limited by shares | Dissolved |
| WESTPAC SECURITIES (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| WESTPAC TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| WESTPAC TECHNOLOGY LIMITED | Private company limited by shares | Live |
| WESTPAC SPORTS TECHNOLOGY CO. LIMITED | Private company limited by shares | Live |
| WESTPAC WATER TREATMENT (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| WESTPACK LIMITED | Private company limited by shares | Live |