| # | Company name | Role | # of projects |
|---|---|---|---|
| 1 | U. Dori Company | Construction company | 111 |
| 2 | UBA Bouw | Construction company | 23 |
| 3 | UBM, Inc. | Construction company | 9 |
| 4 | Üçem İnşaat | Construction company | 3 |
| 5 | UDK Construction Inc. | Construction company | 3 |
| 6 | Ueki Corporation | Construction company | 4 |
| 7 | Uicesa | Construction company | 2 |
| 8 | UKS Elmashstroy | Construction company | 4 |
| 9 | Ullscrest Construction Ltd. | Construction company | 1 |
| 10 | Uma Incorporadora | Construction company | 1 |
| 11 | Umbral Propiedad Raiz | Construction company | 56 |
| 12 | Umebayashi Corporation | Construction company | 1 |
| 13 | Unenco - União de Engenheiros Construtores SA | Construction company | 4 |
| 14 | UNGLEHRT GmbH & Co.KG | Construction company | 0 |
| 15 | UNI Construtora e Incorporadora | Construction company | 11 |
| 16 | União Engenharia | Construction company | 2 |
| 17 | Unidade Engenharia | Construction company | 5 |
| 18 | Union Bridge Company | Construction company | 2 |
| 19 | Union Construction Inc. | Construction company | 0 |
| 20 | Union Contracting Company L.L.C. | Construction company | 1 |