| Weider Rør AS | Namsos | 2009 |
| Weighbridge Services Ltd | Sheffield S6 1Nr England | 2022 |
| Weinmann Holzbausystemtechnik GmbH | De-72813 St. Johann | 2019 |
| Wel-Bygg AS | Son | 1995 |
| Wela Glass AS | Rådal | 2021 |
| Weland Lagersystem AB | Se-33236 Gislaved | 2013 |
| Weldex Group Oü Nuf | Ee-10145 Tallinn | 2025 |
| Welding Engineering | Oslo | 2012 |
| Weldwork Nuf | Lt-31221 Visaginas | 2023 |
| Welement | Ee- 50409 Tartumaa | 2018 |
| Welhaven Elektro AS | Asker | 2020 |
| Wellco Eiendom AS | Sandnes | 2002 |
| Welldone TK Uab | Lt-03102 Lithuania | 2014 |
| Welle & Eskedal Design AS | Nodeland | 2022 |
| Welltech AS | Åsgårdstrand | 2018 |
| Wem AS | Egersund | 2026 |
| Weman Holding AS | Vestfossen | 2017 |
| Wemont | Lv-1073 Riga | 2020 |
| Wenaas Bygg Og Anlegg AS | Frei | 1991 |
| Wendelbo Forvaltning AS | Oslo | 2015 |
| Wendts Montage AB | Halden | 2010 |
| Wenneberg Bygg AS | Gamle Fredrikstad | 2014 |
| Wergeland Bygg & Interiør AS | Bergen | 2024 |
| Wergeland Elektro & VVS AS | Brekke | 1985 |
| Wergeland Elektro Eigedom AS | Brekke | 2005 |
| Wergeland Glassbygg AS | Rådal | 2019 |
| Wergelands Bygd AS | Bøn | 2005 |
| Wergelands Gruppen Da | Sandnes | 2005 |
| Werkland AS | Skatval | 2021 |
| Wermlands Bygg & Badrum AB | 664 51 Vålberg | 2019 |
| Wermlands Tapet Og Måleri AB Nuf | Oslo | 2014 |
| Werner Barth Bademiljø AS | Sandefjord | 1996 |
| Werner Bygg | Se-542 92 Mariestad | 2014 |
| Werner Elektrisk Installasjon AS | Drammen | 1983 |
| Werner Johansen AS | Tjodalyng | 2026 |
| Werth Elektro AS | Horten | 2012 |
| Weseth Glass AS | Kongsberg | 2020 |
| Wessel Entreprenør AS | Kjørsvikbugen | 2007 |
| West Fugeservice AS | Innvik | 2023 |
| West Handtverk AS | Arnatveit | 2020 |
| West Parkettsliperi AS | Oslo | 2001 |
| West Pipe AS | Sarpsborg | 2011 |
| West Tak AS | Bergen | 2016 |
| West Wermland Montasje AS | Hønefoss | 2013 |
| West' Entreprenør AS | Mjøndalen | 2005 |
| West-Coast Scaffholding | Haugesund | 2011 |
| Westby Teknisk Isolering AS | Oslo | 2008 |
| Westbys Lås & Innbruddssikring AS | Oslo | 2001 |
| Westcon Power & Automation AS | Ølensvåg | 2020 |
| Western Electricity Services Nuf | Lt-92135 Klaipeda | 2024 |
| Westgaard VVS AS | Askim | 2021 |
| Westgryf - Weglarz I Narozanska Nuf | Ølensvåg | 2005 |
| Westkran Crane & Service AS | Skogsvåg | 2022 |
| Westland Byggetjenester AS | Slattum | 2024 |
| Westland VVS AS | Hjelmås | 2024 |
| Westli Mur & Flis AS | Askim | 2026 |
| Westop Oü Nuf | Fi-03100 Nummela | 2024 |
| Westpipe AS | Stadlandet | 2022 |
| Westrum Invest AS | Jar | 2023 |
| Westvent AS | Stord | 2025 |
| Wet Ground Construction AS | Oslo | 2002 |
| Wethal Elektroentreprenør AS | Oslo | 2002 |
| Wetlesen Anlegg AS | Ås | 1999 |
| Wetteland Elektro AS | Brusand | 2010 |
| Wettergren Fasade AS | Oslo | 1992 |
| Weum AS | Hokksund | 2023 |
| WF12 Bolig AS | Oslo | 2023 |
| What Are You Holding AS | Randaberg | 2024 |
| Whi Electronics Da | Brumunddal | 2015 |
| Whiplash AS | Lakselv | 2022 |
| White Holding AS | Vestskogen | 2019 |
| Wibe Entreprenør AS | Åros | 2024 |
| Wibra AS | Romedal | 1999 |
| Wickstrøm AS | Vestre Jakobselv | 1998 |
| Wicote Entreprenad | 418 78 Göteborg | 2014 |
| Wicotec | Dk-2630 Taastrup | 2012 |
| Wictoria Invest AS | Borre | 2018 |
| Wida Invest AS | Vinterbro | 2017 |
| Widar Lindgren Transport AS | Skien | 2005 |
| Widar's Service AS | Hvittingfoss | 2017 |
| Wide Systems AB Nuf | 451 96 Uddevalla | 2022 |
| Widecon AS | Rosendal | 2019 |
| Widex Wieslaw Derkowski | Pl-65-001 Zielona | 2005 |
| Widme AS | Sør-Fron | 2023 |
| Wieder Bygg AS | Arendal | 2022 |
| Wielar Miroslaw Antczak Nuf | 80-170 Gdansk | 2007 |
| Wien Bygg AS | Dokka | 2017 |
| Wiens AS | Gran | 2020 |
| Wierød Maskin AS | Kvelde | 2015 |
| Wieslaw Cybulski Cybulski | 82-500 Kwidzyn | 2007 |
| Wieslaw Wielgosz Uslugi Ogolnobudowlane Nuf | 22-670 Belzec | 2014 |
| Wiggen VVS AS | Trondheim | 2009 |
| Wiggo Rønningen Holding AS | Osen | 2005 |
| Wiggson AB Nuf | Oslo | 2013 |
| Wigro Ans | Åkrehamn | 1998 |
| Wigør Elektro AS | Stavern | 2025 |
| Wiig Rørservice AS | Heimdal | 2025 |
| Wiik Entreprenør AS | Sandefjord | 2016 |
| Wiik Fjellsprenging AS | Tverlandet | 2021 |
| Wiik Ing. Elektro AS | Kvaløysletta | 2026 |