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| OCBC Bank (2) | OIE Services (1) |
| Oil Offshore Marine (8) | OmniGreen Wellness (1) |
| Openlink (2) | OPTIMAX VISION (1) |
| Optimum Solutions (4) | Orchid Country Club (4) |
| Orgtel Ltd (22) | ORIENTAL HANDICRAFT (S) PTE LTD (1) |
| Orion Health (1) | Ortus (1) |
| Ortus Singapore (1) | OSIM International Ltd (2) |