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| 542 | Ozak Seiko (s) Pte Ltd
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| 543 | Oval Asia Pacific Pte Ltd
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| 544 | Otano Trading
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| 545 | Omb Valves Asia Pte Ltd
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| 546 | Omni Metal Pte Ltd
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| 547 | Ong Kah Hoe Industrial Pte Ltd
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| 548 | Oceanic Underwater Services (pte) Ltd
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| 550 | Opus Precision Instruments Pte Ltd
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| 551 | Oceanav Pte. Ltd.
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