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| 572 | Origin Associates Pte Ltd 199001301N | 启用 |
| 573 | Orion Offshore Engineering Services Pte Ltd
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| 574 | Orient Goldsmiths & Jewellers (Pte) Ltd
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| 575 | Om-matic (S'pore) Pte Ltd
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| 576 | O W Electrical Engineering Service Pte Ltd 198102316R | 启用 |
| 577 | Otis Elevator Company (s) Pte Ltd 198105619C | 启用 |
| 578 | Overseas (s'pore) Security & Pte Investigation Consultants Pte. Ltd. 200507344H | 启用 |
| 579 | Oriental Metals Pte Ltd 200104588H | 启用 |
| 580 | Oerlikon Leybold Vacuum S'pore Pte Ltd
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| 581 | Oerlikon Balzers Coating S'pore Pte Ltd
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| 582 | Onpress Printed Circuits (S) Pte Ltd
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| 583 | Optec (Fiber Optic) S'pore Pte Ltd
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| 584 | Oneline Industrial Resources Pte. Ltd. 200301571W | 启用 |
| 585 | Our Workshop System (s) Pte Ltd 200103473K | 启用 |
| 586 | Orchard Maharajah's North Indian Restaurant
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| 587 | Orange Rnd Pte. Ltd. 200710629M | 启用 |
| 588 | Oceanus Marine Services 53094505C | 启用 |
| 589 | Odc Technology (pte) Ltd 197502263C | 启用 |
| 590 | Orange Applications For Business Singapore Pte. Ltd. 199408659W | 启用 |
| 591 | Omni Crest Engineering & Construction Pte. Ltd. 200619392E | 启用 |
| 592 | Oaks Builders & Interior Decorators Pte. Ltd. 200813184N | 启用 |
| 593 | Osk Engineering Pte. Ltd. 198801372W | 启用 |
| 594 | Onhand Industrial & Trading 52972872M | 启用 |
| 595 | Ole Interior Design Pte. Ltd. 200707840E | 启用 |
| 596 | Oths Builders 53088825D | 启用 |
| 597 | Otronix Hydrosphere Pte. Ltd. 200304860G | 启用 |
| 598 | Omega Products International Pte Ltd 199703023R | 启用 |
| 599 | Oas Engineering Pte. Ltd. 200402054M | 启用 |
| 600 | Oh Lian Hock Construction Pte Ltd 199800375Z | 启用 |