| Name | Org.no. | Municipality | |
|---|---|---|---|
| YTREDAL DIREKTE | 920698964 | SUNNFJORD |
| YTRELAND AS | 933731855 | KARMØY |
| YTTERDAHL AS | 929572912 | FARSUND |
| YTTERLI MASKIN AS | 829513722 | RAUMA |
| ZAZA TIMBER CONSTRUCTION NUF | 826544902 | |
| Z BYGG AS | 926177265 | LILLESTRØM |
| ZEINER BOLIG HÅNDVERK AS | 948974487 | FÆRDER |
| ZENITH ELEKTRO AS | 930349607 | SULA |
| ZIS AS | 914876877 | FREDRIKSTAD |
| ZL BYGG AS | 924365935 | MELHUS |
| ZM RØR AS | 998740533 | SURNADAL |