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| 512 | Y.h.h Manufacturing Pte. Ltd.
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| 513 | Yeo's Brother Transport Services
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| 514 | Yang Yun Xin Bus Service
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| 515 | Yang Marine Automation Pte. Ltd.
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| 516 | Yang Hua Cake House
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| 517 | Yacht Construction (sea) Pte Ltd
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| 518 | Yew Huat Scaffolding Work
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| 519 | Yang Tai Hardware & Engineering Co
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| 520 | Yat Guan Investment Pte Ltd
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| 521 | Yeo Trailer Engineering & Trading
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| 522 | Yancey Huang (private) Limited
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| 523 | Yeow Hwa Engineering Pte Ltd
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| 524 | Yap Sun Hardware Mfy Pte Ltd
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| 525 | Yew Eng Trading Company
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| 526 | Yek Hin Machinery Pte. Ltd.
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| 527 | Yee Lee Pte Ltd
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| 528 | Yeung Yew Pte. Ltd.
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| 529 | Yew Aik (s) Pte Ltd
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| 530 | Yargay Mci Pte. Ltd.
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| 531 | Yen Thiam Construction Pte Ltd
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| 532 | Yan Tong Credit Pte. Ltd.
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| 533 | Yn Electrical & Trading
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| 534 | Yong Seng Keat Electrical Engineering
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| 535 | Yutaka Pte Ltd
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| 536 | Yu Chun Engineering & Construction
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| 537 | Yme Link S'pore Pte Ltd
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| 538 | Ymc Marine Pte Ltd
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| 539 | Ying Tat Interior & Renovation
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