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| 512 | Alkotech
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| 513 | Asia Time Marketing
50512600A | Aktif |
| 514 | Aries 14
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| 515 | Anhua Group
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| 516 | A+ Clean Pte. Ltd.
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| 517 | Aa Plaza Llp
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| 518 | A&b Electrical Lighting Service
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| 519 | Advance Wire Cut Enterprise
50599400C | Aktif |
| 520 | Ah Hwee Motor Repairer
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| 521 | Ai Lee Tailor
23947100L | Aktif |
| 522 | Adrenalx Limited Liability Partnership
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| 523 | A&k Abundance Llp
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| 524 | Andrew Sidwell (sg) Pte. Ltd.
201422995G | Aktif |
| 525 | Afluente (s) Llp
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| 526 | Aeroequip Engineering
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| 527 | Ad Focus
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| 528 | Artistics Furniture
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| 529 | Antra Enterprise Llp
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| 530 | A M K Services
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| 531 | Augmented Heuristics Llp
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| 532 | Affinity Creation Private Limited
201500438E | Aktif |
| 533 | Ang Mo Kio Medical Hall
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| 534 | Ang Chin Moh Kheng Kee Undertakers
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| 535 | Asean+3 Macroeconomic Research Office
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| 536 | Airspeed
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| 537 | Ann Joo Motor Services
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| 538 | Abroad Education Services
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| 539 | Ada Maintenance Services
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| 540 | Ah Heng Co
24495700B | Aktif |