| # | Company name | Role | # of projects |
|---|---|---|---|
| 5,301 | YMG - Yapi Market Group | Construction company | 0 |
| 5,302 | Yogesh Builders | Construction company | 1 |
| 5,303 | Yokogawa Bridge Corporation | Construction company | 2 |
| 5,304 | Yongnam Holdings | Construction company | 3 |
| 5,305 | Yoshiharagumi Co.,Ltd. | Construction company | 1 |
| 5,306 | Yoshikawa Kensetsu | Construction company | 1 |
| 5,307 | Yoshinaga Sangyo Co.,Ltd. | Construction company | 1 |
| 5,308 | Young Electric Sign Company | Construction company | 1 |
| 5,309 | Yticon Construção e Incorporação | Construction company | 23 |
| 5,310 | Yugmontazhspetsstroy, OOO | Construction company | 3 |
| 5,311 | Yüksel Construction Co. | Construction company | 15 |
| 5,312 | Yuny Incorporadora | Construction company | 35 |
| 5,313 | Yuval Alon Ltd. | Construction company | 19 |
| 5,314 | Z. Landau Construction Ltd. | Construction company | 11 |
| 5,315 | Z.M.H Hammerman Group Ltd. | Construction company | 67 |
| 5,316 | Zabo Empreendimentos e Construções Ltda. | Construction company | 33 |
| 5,317 | Zaf Construtora | Construction company | 1 |
| 5,318 | Zaffari Lora Construtora | Construction company | 5 |
| 5,319 | ZAFIR Construtora | Construction company | 52 |
| 5,320 | Zaguri M. S. Construction Ltd. | Construction company | 4 |