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