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| 602 | Oth Construction & Engineering (s) Pte Ltd
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| 603 | Oes Construction Pte Ltd
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| 604 | Ozscreen (s) Pte. Ltd.
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| 605 | Ohc Construction Pte Ltd
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| 606 | Oas Painting Construction Pte Ltd
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| 607 | O K G Construction & Trading Pte Ltd
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| 608 | One Marina Property Services Pte. Ltd.
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| 609 | Olympus Singapore Pte. Ltd.
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| 610 | Otto Solutions Pte. Ltd.
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| 611 | Opus It Services Pte Ltd
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| 612 | Ocean Venture Pte. Ltd.
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| 613 | Ong Chwee Sen Trading Company
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| 614 | Omega Integration Pte Ltd
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| 615 | Osacar City Audio Visual Pte. Ltd.
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| 616 | Optimum Energy Pte Ltd
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| 617 | Oceanic Marine Pte. Ltd.
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| 618 | Ostling Marking Systems (sea) Pte. Ltd.
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| 619 | Oceangate Trading Pte Ltd
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| 620 | Okumura Corporation Singapore Branch
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| 621 | Obayashi Corporation
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| 622 | Okh Holdings Pte. Ltd.
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| 623 | Osem Namas Pte. Ltd.
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| 624 | Or Kim Peow Contractors (private) Limited
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| 625 | Orient Natural Resources Pte. Ltd.
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| 626 | Officina Meccanica Sestese (singapore) Pte Ltd
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| 627 | Oki Design & Contracts
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| 629 | Onestop Creative Associate Pte. Ltd.
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| 630 | Oil Spill Science Solution
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