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| Waldem Group | 74001 Haabneeme, Harjumaa | 2013 |
| Waldemar Biesiekierski Waldi | 80-261 Gdansk | 2006 |
| Waldemar Jankowski Waldi | 19-300 Elk | 2007 |
| Waldemar Plata Budex | 50-443 Wroclaw | 2010 |
| Waldemar Podwojski Firma Wadex | Grålum | 2006 |
| Waldemar Tasta Service AS | Randaberg | 2025 |
| Walderhaug Byggmontering AS | Valderøya | 2006 |
| Waldner Laboreinrichtungen SE & Co. KG | De-88239 Wangen | 2024 |
| Walheim AS | Gjøvik | 2007 |
| Wall Street Systems UK Ltd | Oslo | 2015 |
| Wall to Wall Norway AS | Oslo | 2025 |
| Walle Trehåndverk Og Breføring | Geilo | 2003 |
| Wallem Holding AS | Hordvik | 2018 |
| Wallin Bygg & Eiendom AS | Åndalsnes | 2023 |
| Wallmakers Norge AS | Larvik | 2021 |
| Walo Construction | Ch-8953 Dietikon | 2020 |
| Walo Norge AS | Oslo | 2015 |
| Walstad Maskin AS | Sømna | 2019 |
| Walsøe Maskin Ans | Kabelvåg | 1999 |
| Waltenberg AS | Lyngseidet | 2014 |
| Walter Gundersen AS | Askvoll | 2005 |
| Walter Wilhelmsen AS | Kvaløya | 1994 |
| Walther Karppinen & Sønn AS | Tønsberg | 1966 |
| Walther Sæthre & Co AS | Kaupanger | 2001 |
| Walthers Bygg Og Eiendomsservice AS | Torød | 2026 |
| Waltl Seilbahnen GmbH | At-6391 Fieberbrunn | 2016 |
| Wamberg Rør Og Flis AS | Oslo | 2006 |
| Wami AS | Oslo | 2026 |
| Wang & Carlsen Tjensteformidling AS | Oslo | 2024 |
| Wang Elektro AS | Brekstad | 2017 |
| Wangberg VVS AS | Heimdal | 1990 |
| Wangen Maskin & Utleie AS | Rognan | 2020 |
| Wanzl Nordic AB | Sandefjord | 2005 |
| Wappbox AS | Kristiansand S | 2012 |
| Wara Invest AS | Kirkenes | 2023 |
| Warberg Holding AS | Ålesund | 2019 |
| Ward-Instal System Uslugi Elektryczne - Ogolno Budowlane Damian Wardowski Nuf | 87-313 Brzozie | 2025 |
| WARD1 AS | Hareid | 2011 |
| Wardrum AS | Råholt | 2022 |
| Waren Bygg AS | Mandal | 2023 |
| Wari Holding AS | Grimstad | 2020 |
| Wari Hus AS | Grimstad | 2020 |
| Warloff Fjellsprenging AS | Vestfossen | 2011 |
| Warmbrodt VVS AS | Lindesnes | 2009 |
| Warming AS | Tønsberg | 2023 |
| Warpe Bygg AS | Fyllingsdalen | 2026 |
| Warrenbygg AS | Oslo | 2024 |
| Wartinger GmbH & Co. KG | De-95683 Ebnath | 2009 |
| Wasa Bygg AS | Flateby | 2021 |
| Wasa Dredging OY Ltd Nuf | 65100 Vaasa | 2012 |
| Wasakatto OY Nuf | Fi-65280 Vaasa | 2026 |
| Wassrud Betonggulv AS | Sør-Fron | 2021 |
| Wassæther Gulvsliping Limited Nuf | Sandstad | 2020 |
| Wataha Bygg AS | Tromsdalen | 2024 |
| Watco AS | Åfjord | 2012 |
| Water Environment Services Nuf | Sande I Vestfold | 2009 |
| Waterfeed AS | Ålesund | 2015 |
| Watson Hartley Og Beston Asphalt Ans | Oslo | 2001 |
| Watt Eiendom AS | Espa | 2023 |
| Watt Holding AS | Fornebu | 2005 |
| Wattne Bygg AS | Kristiansand S | 2026 |
| Watts App AS | Ålesund | 2021 |
| Wax Hus AS | Drammen | 1994 |
| Waxx Holding AS | Vear | 2025 |
| Wayss & Freytag Ingeniurbau AG | 60489 Frankfurt Am Main | 2017 |
| WB Brønnboring AS | Stathelle | 1999 |
| WB Rehab & Interiør AS | Nesøya | 2011 |
| WB. Bygg Kompetanse AS | Oslo | 2022 |
| Wbe AS | Inderøy | 2015 |
| WBL AS | Opphaug | 2014 |
| WD Bygg & Montasje AS | Maura | 2012 |
| Wda Byggservice AS | Hønefoss | 2019 |
| Wdi Bygg AS | Bekkestua | 2013 |
| WDW Poland Spolka Z Organiczona Odpowiedzialnoscia Spolka Komandytowa Nuf | 20-867 Lublin | 2022 |
| We Build Parks Norway AS | Harstad | 2023 |
| We Service AS | Rælingen | 2022 |
| We Service Group AS | Rælingen | 2021 |
| We Walter S.R.L. | It-Cap 20093 Cologno Monzese (Mi) | 2023 |
| Wear Entreprenør AS | Røyken | 2008 |
| Weba AS | Oslo | 2013 |
| Weberg Rekkverk AS | Torp | 2023 |
| Weberg Rør & Service AS | Moen | 2025 |
| Weberg Vei Og Landbrukstjenester AS | Fredrikstad | 2019 |
| Webicon AS | Kopervik | 2013 |
| Webjørn Svendsen AS | Ålesund | 1978 |
| Webjørnsen Holding AS | Greåker | 2022 |
| Webuild S.P.A. Nuf | Sandsli | 2017 |
| Wec Grid Connect GmbH | De-26607 Aurich | 2022 |
| Wec Installation GmbH | De-26607 Aurich | 2022 |
| Weco Eiendom AS | Kvaløya | 2018 |
| Weddes Rørservice AS | Kolvereid | 2012 |
| Wedum & Co AS | Follebu | 1999 |
| Wedum Elektro AS | Lillehammer | 2001 |
| Wedø Support AS | Sjetnemarka | 2013 |
| Weekend AS | Hamar | 2013 |
| Wefald Entreprenør AS | Neslandsvatn | 2018 |
| Wefring Entreprenør AS | Stanghelle | 1998 |
| Weg AS | Ski | 2021 |
| Weg Scandinavia AB Nuf | Moss | 2010 |