| 421 | Optims Asia Pte Ltd
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| 422 | Optimus & Standard Int'l Pte Ltd
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| 423 | Oncology Centre The
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| 424 | Oser Design Pte Ltd
199305979N | 启用 |
| 425 | Origin Jetters
45453200L | 启用 |
| 426 | Osi Electronics Pte. Ltd.
200604568C | 启用 |
| 427 | Olympia Printing Pte Ltd
199608621Z | 启用 |
| 428 | Original Sin By Michelangelo's
52841204C | 启用 |
| 429 | Original Media Pte Ltd
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| 430 | Ong Boon Seng Pte. Ltd.
200001699N | 启用 |
| 431 | On Cheong Jewellery
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| 432 | Orix Capital Ltd
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| 433 | Oshika Singapore Pte Ltd
198104636W | 启用 |
| 434 | Ondori Pte Ltd
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| 435 | On Demand Contract & Svcs Pte Ltd
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| 436 | Orexis Trading Pte Ltd
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| 437 | Ong Ban Hong Leong (Pte) Ltd
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| 438 | Omeio Int'l Pte Ltd
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| 439 | Orion Worldwide Pte. Ltd.
200502895N | 启用 |
| 440 | Oliver Dental Surgery Pte Ltd
199501028K | 启用 |
| 441 | Oltec Pacific Center Pte Ltd
199703670N | 启用 |
| 442 | Outdoor Life Pte. Ltd.
200700158H | 启用 |
| 443 | Oub Centre Ltd
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| 444 | Otto Furnishings Pte. Ltd.
199707395R | 启用 |
| 445 | Otto Marine Ltd
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| 446 | Oto Bodycare Pte. Ltd.
198303351R | 启用 |
| 447 | Orix Rentec (S) Pte Ltd
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| 448 | Osim Int'l Ltd
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| 449 | Orthopaedic Associates
50766600C | 启用 |
| 450 | Orthopaedic & Traumatic Surgery Pte Ltd
198601575M | 启用 |