| 511 | Yellow & Red Construction 52847249J | Active |
| 512 | Yew Kee Pte. Ltd. 200414862K | Active |
| 513 | Yg 1 Tools Asia Pte Ltd 200009861H | Active |
| 514 | Yee Lim Adhesives Industries 21817500X | Active |
| 515 | Yeo Keng Sin Transport Service 27589200W | Active |
| 516 | Yeow Seng (Shark's Fin) Pte Ltd
| Active |
| 517 | Y.h.h Manufacturing Pte. Ltd. 200820971N | Active |
| 518 | Yeo's Brother Transport Services 26492900D | Active |
| 519 | Yang Yun Xin Bus Service 44258900W | Active |
| 520 | Yang Marine Automation Pte. Ltd. 201000267E | Active |
| 521 | Yang Hua Cake House 52850995X | Active |
| 522 | Yacht Construction (sea) Pte Ltd 198803876G | Active |
| 523 | Yew Huat Scaffolding Work 26539600W | Active |
| 524 | Yang Tai Hardware & Engineering Co 25426900A | Active |
| 525 | Yat Guan Investment Pte Ltd 199104874C | Active |
| 526 | Yeo Trailer Engineering & Trading 49458100W | Active |
| 527 | Yancey Huang (private) Limited 196700053H | Active |
| 528 | Yeow Hwa Engineering Pte Ltd 198304889K | Active |
| 529 | Yap Sun Hardware Mfy Pte Ltd 199002839H | Active |
| 530 | Yew Eng Trading Company 08435800M | Active |
| 531 | Yek Hin Machinery Pte. Ltd. 198803748R | Active |
| 532 | Yee Lee Pte Ltd 198001792M | Active |
| 533 | Yeung Yew Pte. Ltd. 200608335G | Active |
| 534 | Yew Aik (s) Pte Ltd 199000496C | Active |
| 535 | Yargay Mci Pte. Ltd. 198801810M | Active |
| 536 | Yen Thiam Construction Pte Ltd 198700003R | Active |
| 537 | Yan Tong Credit Pte. Ltd. 199105881W | Active |
| 538 | Yn Electrical & Trading 51135900D | Active |
| 539 | Yong Seng Keat Electrical Engineering 21244000D | Active |
| 540 | Yutaka Pte Ltd 197800738H | Active |