| 571 | Orion Offshore Engineering Services Pte Ltd
| Active |
| 572 | Orient Goldsmiths & Jewellers (Pte) Ltd
| Active |
| 573 | Om-matic (S'pore) Pte Ltd
| Active |
| 574 | O W Electrical Engineering Service Pte Ltd
198102316R | Active |
| 575 | Otis Elevator Company (s) Pte Ltd
198105619C | Active |
| 576 | Oriental Metals Pte Ltd
200104588H | Active |
| 577 | Oerlikon Leybold Vacuum S'pore Pte Ltd
| Active |
| 578 | Oerlikon Balzers Coating S'pore Pte Ltd
| Active |
| 579 | Onpress Printed Circuits (S) Pte Ltd
| Active |
| 580 | Optec (Fiber Optic) S'pore Pte Ltd
| Active |
| 581 | Oneline Industrial Resources Pte. Ltd.
200301571W | Active |
| 582 | Our Workshop System (s) Pte Ltd
200103473K | Active |
| 583 | Orchard Maharajah's North Indian Restaurant
| Active |
| 584 | Orange Rnd Pte. Ltd.
200710629M | Active |
| 585 | Oceanus Marine Services
53094505C | Active |
| 586 | Odc Technology (pte) Ltd
197502263C | Active |
| 587 | Orange Applications For Business Singapore Pte. Ltd.
199408659W | Active |
| 588 | Omni Crest Engineering & Construction Pte. Ltd.
200619392E | Active |
| 589 | Oaks Builders & Interior Decorators Pte. Ltd.
200813184N | Active |
| 590 | Osk Engineering Pte. Ltd.
198801372W | Active |
| 591 | Onhand Industrial & Trading
52972872M | Active |
| 592 | Ole Interior Design Pte. Ltd.
200707840E | Active |
| 593 | Oths Builders
53088825D | Active |
| 594 | Otronix Hydrosphere Pte. Ltd.
200304860G | Active |
| 595 | Omega Products International Pte Ltd
199703023R | Active |
| 596 | Oas Engineering Pte. Ltd.
200402054M | Active |
| 597 | Oh Lian Hock Construction Pte Ltd
199800375Z | Active |
| 598 | Ocl Building Services Pte. Ltd.
200306919H | Active |
| 599 | Oth Construction & Engineering (s) Pte Ltd
199802008M | Active |
| 600 | Oes Construction Pte Ltd
199206437C | Active |