| SO-IN CAUSEWAY BAY EDUCATION CENTRE LIMITED | Private company limited by shares | Live |
| SO-IN EDUCATION CENTRE LIMITED | Private company limited by shares | Live |
| SO-IN BLESSINGS EDUCATION CENTRE LIMITED | Private company limited by shares | Live |
| SO-IN DILIGENCE EDUCATION CENTRE LIMITED | Private company limited by shares | Live |
| SO-IN WISDOM EDUCATION CENTRE LIMITED | Private company limited by shares | Live |
| SO-IN INSPIRE EDUCATION CENTRE LIMITED | Private company limited by shares | Live |
| SO-IN JIREH EDUCATION CENTRE LIMITED | Private company limited by shares | Live |
| SO-IN JOYFUL EDUCATION CENTRE LIMITED | Private company limited by shares | Live |
| SO-IN EDUCATION CENTRE (K.E.) LIMITED | Private company limited by shares | Live |
| SO-IN SCHOLARS EDUCATION CENTRE LIMITED | | Live |
| SO-IN EDUCATION CENTRE (S.S.K.E.) LIMITED | Private company limited by shares | Live |
| SO-IN Vision Education Centre Limited | Private company limited by shares | Live |
| SO-IN EDUCATION CENTRE (WHAMPOA) LIMITED | Private company limited by shares | Live |
| SO-IN EDUCATION CENTRE (YAUMATEI) LIMITED | Private company limited by shares | Live |
| SO-IN ETERNAL EDUCATION CENTRE LIMITED | Private company limited by shares | Live |
| SO-IN EXCEL EDUCATION CENTRE LIMITED | Private company limited by shares | Live |
| SO-IN KEPLER EDUCATION CENTRE LIMITED | | Live |
| SO-IN SUNNY EDUCATION CENTRE LIMITED | Private company limited by shares | Live |
| SO-IN Talent Education Centre Limited | Private company limited by shares | Live |
| SO-IN Tech Limited | Private company limited by shares | Live |
| SOIN TECHNOLOGY LIMITED | | Live |
| SOIN TRADING COMPANY LIMITED | Private company limited by shares | Live |
| SO-IN WILLEY EDUCATION CENTRE LIMITED | Private company limited by shares | Live |
| Soina Limited | | Live |
| Soina Education Consulting Co., Limited | Private company limited by shares | Live |
| So-Ingenious Limited | Private company limited by shares | Live |
| SOINHOLD INTERNATIONAL HOLDING CO., LIMITED | Private company limited by shares | Dissolved |
| Soinno Innovation Limited | | Live |
| DE SOINS CONSULTANCY LIMITED | Private company limited by shares | Live |
| Sointechk Trading Limited | Private company limited by shares | Live |