| 601 | Ocl Building Services Pte. Ltd. 200306919H | 启用 |
| 602 | Oth Construction & Engineering (s) Pte Ltd 199802008M | 启用 |
| 603 | Oes Construction Pte Ltd 199206437C | 启用 |
| 604 | Ozscreen (s) Pte. Ltd. 200204975E | 启用 |
| 605 | Ohc Construction Pte Ltd 199401496M | 启用 |
| 606 | Oas Painting Construction Pte Ltd 199802805R | 启用 |
| 607 | O K G Construction & Trading Pte Ltd 198701652M | 启用 |
| 608 | One Marina Property Services Pte. Ltd. 199200746H | 启用 |
| 609 | Olympus Singapore Pte. Ltd. 198900566E | 启用 |
| 610 | Otto Solutions Pte. Ltd. 199204172C | 启用 |
| 611 | Opus It Services Pte Ltd 199002450W | 启用 |
| 612 | Ocean Venture Pte. Ltd. 200204687R | 启用 |
| 613 | Ong Chwee Sen Trading Company 09398600M | 启用 |
| 614 | Omega Integration Pte Ltd 199908134D | 启用 |
| 615 | Osacar City Audio Visual Pte. Ltd. 198502288G | 启用 |
| 616 | Optimum Energy Pte Ltd
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| 617 | Oceanic Marine Pte. Ltd. 200804052W | 启用 |
| 618 | Ostling Marking Systems (sea) Pte. Ltd. 200303658R | 启用 |
| 619 | Oceangate Trading Pte Ltd 200100921H | 启用 |
| 620 | Okumura Corporation Singapore Branch T08FC7307K | 启用 |
| 621 | Obayashi Corporation S66FC1777A | 启用 |
| 622 | Okh Holdings Pte. Ltd. 199800758E | 启用 |
| 623 | Osem Namas Pte. Ltd. 200905111K | 启用 |
| 624 | Or Kim Peow Contractors (private) Limited 197701891R | 启用 |
| 625 | Orient Natural Resources Pte. Ltd. 201015702G | 启用 |
| 626 | Officina Meccanica Sestese (singapore) Pte Ltd 199705364N | 启用 |
| 627 | Oki Design & Contracts 31850700E | 启用 |
| 628 | Omni Comm Pte Ltd 198803797H | 启用 |
| 629 | Onestop Creative Associate Pte. Ltd. 201004401W | 启用 |
| 630 | Oil Spill Science Solution 52985023X | 启用 |