| 601 | O K G Construction & Trading Pte Ltd 198701652M | 启用 |
| 602 | One Marina Property Services Pte. Ltd. 199200746H | 启用 |
| 603 | Olympus Singapore Pte. Ltd. 198900566E | 启用 |
| 604 | Otto Solutions Pte. Ltd. 199204172C | 启用 |
| 605 | Opus It Services Pte Ltd 199002450W | 启用 |
| 606 | Ocean Venture Pte. Ltd. 200204687R | 启用 |
| 607 | Ong Chwee Sen Trading Company 09398600M | 启用 |
| 608 | Omega Integration Pte Ltd 199908134D | 启用 |
| 609 | Osacar City Audio Visual Pte. Ltd. 198502288G | 启用 |
| 610 | Optimum Energy Pte Ltd
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| 611 | Oceanic Marine Pte. Ltd. 200804052W | 启用 |
| 612 | Ostling Marking Systems (sea) Pte. Ltd. 200303658R | 启用 |
| 613 | Oceangate Trading Pte Ltd 200100921H | 启用 |
| 614 | Okumura Corporation Singapore Branch T08FC7307K | 启用 |
| 615 | Obayashi Corporation S66FC1777A | 启用 |
| 616 | Okh Holdings Pte. Ltd. 199800758E | 启用 |
| 617 | Osem Namas Pte. Ltd. 200905111K | 启用 |
| 618 | Or Kim Peow Contractors (private) Limited 197701891R | 启用 |
| 619 | Orient Natural Resources Pte. Ltd. 201015702G | 启用 |
| 620 | Officina Meccanica Sestese (singapore) Pte Ltd 199705364N | 启用 |
| 621 | Oki Design & Contracts 31850700E | 启用 |
| 622 | Omni Comm Pte Ltd 198803797H | 启用 |
| 623 | Onestop Creative Associate Pte. Ltd. 201004401W | 启用 |
| 624 | Oil Spill Science Solution 52985023X | 启用 |
| 625 | O Z Electric Distribution 52854287K | 启用 |
| 626 | Ong Chwee Ling (private) Limited 197101323N | 启用 |
| 627 | Oversea Aircondition Co. (pte.) Ltd. 197702462G | 启用 |
| 628 | Omega Separations Pte. Ltd. 199702352K | 启用 |
| 629 | Orionis Technologies Pte Ltd
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| 630 | Ocean Electrical Pte. Ltd. 200310504D | 启用 |