| DIOCCI LIMITED | Private company limited by shares | Live |
| DIOCEAN LIMITED | Private company limited by shares | Dissolved |
| Diocean HK Limited | Private company limited by shares | Live |
| Diocesan Capital Limited | Private company limited by shares | Live |
| DIOCESAN OLD GIRLS' ASSOCIATION LIMITED | Company limited by guarantee | Live |
| Diocesan Hong Kong Limited | Private company limited by shares | Live |
| DIOCESAN GIRLS' SCHOOL MANAGEMENT COMMITTEE LIMITED | Company limited by guarantee | Live |
| DIOCESAN MEDICS LIMITED | Private company limited by shares | Live |