| 541 | Optique Zone Safety
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| 542 | Oceanbase Technology Pte Ltd
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| 543 | Ozak Seiko (s) Pte Ltd
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| 544 | Oval Asia Pacific Pte Ltd
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| 545 | Otano Trading
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| 546 | Omb Valves Asia Pte Ltd
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| 547 | Omni Metal Pte Ltd
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| 548 | Ong Kah Hoe Industrial Pte Ltd
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| 549 | Oceanic Underwater Services (pte) Ltd
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| 550 | Overseas Resources Pte. Ltd.
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| 551 | Opus Precision Instruments Pte Ltd
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| 552 | Oceanav Pte. Ltd.
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| 553 | Ong Fencing Contractor Co
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| 554 | Outboard & Marine (Pte) Ltd
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| 555 | One Trading And Industrial Pte. Ltd.
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| 556 | Olympia Diary (s'pore) Pte Ltd
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| 557 | Ocs Facilities Management Singapore Pte. Ltd.
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| 558 | Oceanic Link Pte Ltd
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| 559 | Orchard Parksuites Pte Ltd
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| 560 | Onn Wah Precision Engineering Pte Ltd
199900015D | 有効 |
| 561 | Orient Technology (s) Pte Ltd
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| 562 | Oilwell Supply Pte Ltd
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| 563 | Oakwell Engineering International Pte Ltd
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| 564 | Omron Electronics Pte Ltd
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| 565 | Omni Plus System Pte. Ltd.
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| 566 | Osk Industrial Pte. Ltd.
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| 567 | Origin Associates Pte Ltd
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| 568 | Orion Offshore Engineering Services Pte Ltd
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| 569 | Orient Goldsmiths & Jewellers (Pte) Ltd
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| 570 | Om-matic (S'pore) Pte Ltd
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