| 451 | Orthopaedic Surgery James Lee
| Active |
| 452 | Orthopaedic Practice Pte Ltd 198804556N | Active |
| 453 | Orix Car Rentals Pte Ltd
| Active |
| 454 | Ortho Sports T09CM0038K | Active |
| 455 | Orthopaedic Clinic Pte Ltd 198002880H | Active |
| 456 | Oriental Sheet Piling Pte. Ltd. 200302665Z | Active |
| 457 | Ordnance Development & Engineering Company Of S'pore (1996) Pte Ltd
| Active |
| 458 | Outback Steakhouse
| Active |
| 459 | Otra Pulp & Paper Pte Ltd
| Active |
| 460 | Out Of The Pan
| Active |
| 461 | Outdoor Consultants Pte Ltd 199206719C | Active |
| 462 | Otra Packaging Pte Ltd
| Active |
| 463 | Outsource Centre Pte Ltd 198201584Z | Active |
| 464 | Oticon S'pore Pte Ltd
| Active |
| 465 | Oriental Service Centre 52922277M | Active |
| 466 | Orthodontic & Dental Supplies Pte Ltd 198301334K | Active |
| 467 | Oriental Television & Radio Service
| Active |
| 468 | Ortec Digital Pte Ltd 200103752W | Active |
| 469 | Orthopaedic Sports Medicine Pte Ltd 200001012H | Active |
| 470 | Omni Industries Holdings Pte. Ltd. 199504780K | Active |
| 471 | Olivine Electronics Pte Ltd 198601622K | Active |
| 472 | Olive Tree Rstnt & Cafe
| Active |
| 473 | Ocean Marketing Agency Pte Ltd 198202249R | Active |
| 474 | Oliver Co
| Active |
| 475 | Ocbc Property Services Pte Ltd
| Active |
| 476 | Olk Industrial Mktg Pte Ltd
| Active |
| 477 | Offshore Industries Pte. Ltd. 200406769G | Active |
| 478 | One Stop Global Pte. Ltd. 200800376E | Active |
| 479 | Ovivo S'pore Pte Ltd
| Active |
| 480 | Onda Offshore Technologies Pte. Ltd. 200408376C | Active |