| Business | Founded | Contacts |
|---|---|---|
| Cmc Construction Pte. Ltd. | - | - |
| Goh Puek Thay | - | - |
| 4 Humility '13 | - | - |
| 4 Sincerity'12 | - | - |
| Computer Room 4 @ HIHS | - | - |
| DNT Cove | - | - |
| HIHS Basketball Court | - | - |
| HIHS Library | - | - |
| Silent Reading Room @ HIHS | - | - |
| 4Integrity | - | - |
| Flexi Room 2 (Detention Room) | - | - |
| HIHS Steps | - | - |
| Hihs Itr5 | - | - |
| Mr Gill's Boredom Chamber | - | - |
| Ms Chong's Torture Chamber | - | - |
| Holy Innocents' Old Students' Association - HIOSA | - | 1 |
| See more details on www.address-singapore.com | ||