| Company Name | Type | Status |
|---|---|---|
| STRATUM COMPANY LIMITED | Private company limited by shares | Dissolved |
| STRATUM LIMITED | Private company limited by shares | Dissolved |
| Stratum Limited | Private company limited by shares | Live |
| GRAND STRATUM COMPANY LIMITED | Private company limited by shares | Live |
| Hong Kong New Social Stratum Association Limited | Live | |
| STRATUM-FT LIMITED | Live |