| MAINSTAY COMPANY LIMITED | Private company limited by shares | Live |
| MAINSTAY ASIA LIMITED | Private company limited by shares | Live |
| Asian Mainstay Limited | Private company limited by shares | Dissolved |
| MAINSTAY ELECTRONIC CO., LIMITED | Private company limited by shares | Live |
| MAINSTAY & FORTUNE (HONG KONG) CO., LIMITED | Private company limited by shares | Live |
| Mainstay Trading Co., Limited | Private company limited by shares | Live |
| MAINSTAY PROPERTY CONSULTANTS (HK) LIMITED | Private company limited by shares | Live |
| MAINSTAY DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| HONG KONG MAINSTAY DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| MAINSTAY ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| MAINSTAY FASHION LIMITED | Private company limited by shares | Live |
| MAINSTAY GARMENTS LIMITED | Private company limited by shares | Live |
| MAINSTAY (HOLDINGS) LIMITED | Private company limited by shares | Dissolved |
| MAINSTAY GLOBAL HOLDINGS LIMITED | Private company limited by shares | Dissolved |
| MAINSTAY BUSINESS (HONG KONG) EVOLUTION CO., LIMITED | Private company limited by shares | Dissolved |
| HONG KONG MAINSTAY INTERNATIONAL INVESTMENT CO., LIMITED | Private company limited by shares | Dissolved |
| HONG KONG MAINSTAY TECHNOLOGY LIMITED | | Live |
| HONGKONG MAINSTAY LINEN TEXTILE CO., LIMITED | Private company limited by shares | Dissolved |
| MAINSTAY INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| MAINSTAY MARKETING LIMITED | Private company limited by shares | Live |