| Navn | Postnummer | By |
|---|---|---|
| UN Mobilkraner A/S | 8641 | Sorring |
| Uni-Tek A/S | 8960 | Randers SØ |
| Unicool A/S | 2880 | Bagsværd |
| Unidrain A/S | 2600 | Glostrup |
| Unipark A/S | 3490 | Kvistgård |
| Uniplan Danmark A/S | 2620 | Albertslund |
| UPONOR BUILDING SOLUTIONS DENMARK | 2605 | Brøndby |
| Uponor Infra A/S | 4450 | Jyderup |
| Urban Water Solutions A/S | 5000 | Odense C |
| Urban-Hald ApS | 9800 | Hjørring |
| Uretek | 5580 | Nørre Aaby |