| 541 | Ysh Pte Ltd
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| 542 | Yong Leng Trading Company
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| 543 | Yokosin Automation Pte. Ltd.
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| 544 | Yokogawa Engineering Asia Pte Ltd
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| 545 | Yong Metal Trading
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| 546 | Yangzijiang International (s) Pte Ltd
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| 547 | Yellowschoolbus.com Pte Ltd
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| 548 | Yinda Technology Singapore Pte. Ltd.
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| 549 | Y. H. H. Engineering Pte Ltd
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| 550 | Yee Hong Pte Ltd
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| 551 | Yenn Dar Pte Ltd
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| 552 | Yaw Eng Construction Pte Ltd
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| 553 | Yao Xing Pte. Ltd.
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| 554 | Yclee Construction Engineering Pte. Ltd.
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| 555 | Yeo Heng Electrical Works
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| 556 | Yao Peng Yam Construction
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| 557 | Yew Hing Construction & Renovation
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| 558 | Yap & Lu Plumbing Contractor
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| 559 | Y & B Plumbing & Sanitary Contractor
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| 560 | Y K Contractor
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| 561 | Ye Da Qiu Services & Renovation
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| 562 | Yang Ah Kang & Sons Private Limited
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| 563 | Yeqi Pte. Ltd.
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| 564 | Yam Keng Renovation Enterprise
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| 565 | Y & H Electrical Engineering
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| 566 | Yang Hao Construction
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| 567 | Yau Lee Construction (singapore) Pte. Ltd.
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| 568 | Yew Huat Air Cond & Metal Works
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| 569 | Yeong Soon Fatt Stainless Steel Works
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| 570 | Yaki Work Engineering
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