| 421 | Origin Jetters
45453200L | Active |
| 422 | Osi Electronics Pte. Ltd.
200604568C | Active |
| 423 | Olympia Printing Pte Ltd
199608621Z | Active |
| 424 | Original Sin By Michelangelo's
52841204C | Active |
| 425 | Original Media Pte Ltd
| Active |
| 426 | Ong Boon Seng Pte. Ltd.
200001699N | Active |
| 427 | On Cheong Jewellery
| Active |
| 428 | Orix Capital Ltd
| Active |
| 429 | Oshika Singapore Pte Ltd
198104636W | Active |
| 430 | Ondori Pte Ltd
| Active |
| 431 | On Demand Contract & Svcs Pte Ltd
| Active |
| 432 | Orexis Trading Pte Ltd
| Active |
| 433 | Ong Ban Hong Leong (Pte) Ltd
| Active |
| 434 | Omeio Int'l Pte Ltd
| Active |
| 435 | Orion Worldwide Pte. Ltd.
200502895N | Active |
| 436 | Oliver Dental Surgery Pte Ltd
199501028K | Active |
| 437 | Oltec Pacific Center Pte Ltd
199703670N | Active |
| 438 | Outdoor Life Pte. Ltd.
200700158H | Active |
| 439 | Oub Centre Ltd
| Active |
| 440 | Otto Furnishings Pte. Ltd.
199707395R | Active |
| 441 | Otto Marine Ltd
| Active |
| 442 | Oto Bodycare Pte. Ltd.
198303351R | Active |
| 443 | Orix Rentec (S) Pte Ltd
| Active |
| 444 | Osim Int'l Ltd
| Active |
| 445 | Orthopaedic & Traumatic Surgery Pte Ltd
198601575M | Active |
| 446 | Orthopaedic Surgery James Lee
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| 447 | Orthopaedic Practice Pte Ltd
198804556N | Active |
| 448 | Orix Car Rentals Pte Ltd
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| 449 | Ortho Sports
T09CM0038K | Active |
| 450 | Orthopaedic Clinic Pte Ltd
198002880H | Active |