| YIL TSOI COMPANY LIMITED | Private company limited by shares | Dissolved |
| FU TSOI LIMITED | Private company limited by shares | Dissolved |
| C. Y. Tsoi & Co. Limited | Private company limited by shares | Live |
| TAK TSOI COMPANY LIMITED | Private company limited by shares | Live |
| TSOI TAK ST LIMITED | Private company limited by shares | Live |
| TSOI & TSOI CPA LIMITED | Private company limited by shares | Live |
| Tsoi Yee Company Limited | Private company limited by shares | Live |
| ALLIOTT TSOI HA CPA LIMITED | Private company limited by shares | Dissolved |
| ALLIOTT, TSOI CPA LIMITED | Private company limited by shares | Live |
| DR TSOI & ASSOCIATES LIMITED | Private company limited by shares | Live |
| TSOI HON YUE BROS. LTD. | Private company limited by shares | Dissolved |
| SAN TSOI FINANCE LIMITED | Private company limited by shares | Dissolved |
| HANG TSOI LIMITED | Private company limited by shares | Dissolved |
| TSOI TAK INVESTMENT COMPANY LIMITED | Private company limited by shares | Dissolved |
| TSOI SHENG INVESTMENT CO. LIMITED | Private company limited by shares | Live |
| KEITH TSOI COMPANY LIMITED | Private company limited by shares | Live |
| M.P. TSOI COMPANY LIMITED | Private company limited by shares | Dissolved |
| Sisi Tsoi Limited | Private company limited by shares | Live |
| S.L. TSOI & COMPANY, LIMITED | Private company limited by shares | Dissolved |
| S.W. TSOI CAPITAL LIMITED | Private company limited by shares | Live |
| Wang Tsoi Ink Company Limited | Private company limited by shares | Live |
| TSOIKO GROUP LIMITED | Private company limited by shares | Live |
| QUEEN TSOI'S DEVELOPMENT CO., LIMITED | Private company limited by shares | Live |
| TSOI'S GROUP LIMITED -THE- | Private company limited by shares | Dissolved |
| TSOI'S PAINTING COMPANY LIMITED | Private company limited by shares | Live |
| TSOI'S BEAUTY PRODUCTS LIMITED | Private company limited by shares | Dissolved |
| TSOI'S PLASTIC PRODUCTS LIMITED | Private company limited by shares | Dissolved |
| TSOI'S BROTHERS TRADING LIMITED | Private company limited by shares | Live |