| Wiik Utleie AS | Drivdalen | 2017 |
| Wik Og Sønner AS | Blomsterdalen | 2000 |
| Wike AS | Vormsund | 2024 |
| Wike Holding AS | Vormsund | 2024 |
| Wikfoss Energimontasje AS | Sunndalsøra | 2013 |
| Wikstøl Bygg & Arkitektur AS | Hægeland | 2015 |
| Wikstøl Eiendom AS | Hægeland | 2022 |
| Wiktor Bogdan Mlynarski | Oslo | 2004 |
| Wilbergs Group AS | Grimstad | 2015 |
| Wilh. Kolstad AS | Drammen | 2022 |
| Wilhelmsen Bygg & Vegservice AS | Fjordgard | 2019 |
| Wilhelmsen Mur & Flis AS | Øvre Ervik | 2021 |
| William Eiendom AS | Tromsø | 1999 |
| William Telemark AS | Skien | 2015 |
| Williams Totalservice AS | Langesund | 2026 |
| Williamsholding AS | Søgne | 2021 |
| Williksen Maskin AS | Rørvik | 2019 |
| Willing AS | Rømskog | 2015 |
| Willox Group AS | Follese | 2023 |
| Willumsen Bygg AS | Leinesfjord | 2026 |
| Willy Førland Fjellboring AS | Moi | 2003 |
| Willy Melbye AS | Tobøl | 2022 |
| Willy Olsen El Installasjon AS | Askim | 2012 |
| Willy Stadler Proizvodnja in Trgovina D.O.O. | Si-8273 Leskovec Pri Krskem | 2015 |
| Willys Markiser AS | Horten | 2020 |
| Wilma Flis & Betong Da | Andebu | 2009 |
| Wilmann Og Rø Da | Trondheim | 2002 |
| Wilskog Bygg AS | Hakadal | 2006 |
| Wilson Eiendom AS | Drøbak | 2012 |
| Wima Bygg AS | Oslo | 2022 |
| Wimo AS | Nesttun | 2023 |
| Wimo Fjellsikring AS | Nesttun | 2008 |
| Winbladh Asfalt & Maskin AS | Kråkerøy | 2023 |
| Winbladh Holding AS | Kråkerøy | 2018 |
| Windahl Multiservice AS | Tistedal | 2026 |
| Windblade Solutions S.R.L. Nuf | Ro-05244 Bucuresti | 2026 |
| Windhorst Stahl- Und Metallbau GmbH | De-49424 Goldenstedt | 2022 |
| Windisch Elektro Technik GmbH Nuf | At-8324 Kirchberg A.D.R | 2026 |
| Windkeeper AS | Bergen | 2018 |
| Windkeeper Shipco I AS | Bergen | 2021 |
| Windkeeper Shipco II AS | Bergen | 2021 |
| Windoor Sverige AB | 21239 Malmø | 2010 |
| Windtex Engineering | Lancashire Bl0 9Td | 2016 |
| Wineco | Ee-11317 Tallinn Harjumaa | 2015 |
| Winge Bygg AS | Slemmestad | 2016 |
| Winge Graveservice AS | Våler I Østfold | 2017 |
| Winge Holding AS | Våler I Østfold | 2017 |
| Winge Utvikling AS | Levanger | 2026 |
| Winger Elektriske AS | Snarøya | 2019 |
| Wingereid Maskin AS | Drangedal | 2019 |
| Winges Service AS | Frosta | 2012 |
| Winmar Ehitus Oü | Ee-13424 Tallinn Harju County | 2020 |
| Winnem Bygg AS | Sofiemyr | 2019 |
| Winns AS | Stord | 2010 |
| Winsents VVS AS | Elverum | 2017 |
| Winsnes AS | Støren | 2018 |
| Winstaco Nordic AS | Ytre Enebakk | 2022 |
| Winstall Oü | Fjellhamar | 2015 |
| Wintec AS | Barkåker | 2011 |
| Winter Byggtjenester AS | Limingen | 2015 |
| Winterfell AS | Roa | 2021 |
| Winterspring Holding AS | Sandefjord | 2019 |
| Winther No Dig AS | Åmot | 2001 |
| Winther VVS & Ventilation | Dk-9520 Skørping | 2018 |
| Wintherveien AS | Sørreisa | 2008 |
| Winthrop Technologies Norway AS | Oslo | 2019 |
| Wira-Bau | De-27446 Anderlingen | 2009 |
| Wire AS | Våler I Østfold | 2025 |
| Wire Elektro AS | Våler I Østfold | 2025 |
| Wirecut Nordic AS | Greåker | 2024 |
| Wirecut Nordic Drift AS | Greåker | 2015 |
| Wireless Telecom Consulting Group Nordic AB Nuf | Se-200 21 Malmö | 2020 |
| Wis VVS AS | Florø | 2016 |
| Wiseth AS | Ski | 2013 |
| Wisewood AS | Oslo | 2015 |
| Wisings Allservice | Oslo | 2001 |
| Wisko Alltjänst | Se-870 32 Lillånger | 2012 |
| Wislan Rør AS | Ski | 2012 |
| Wismar Byg Aps | Dk-8340 Malling | 2011 |
| Wist Mikaelsen & Gifstad AS | Oslo | 2002 |
| Wister Bygg Og Eiendom AS | Halden | 2025 |
| Wito Bil AS | Gol | 2015 |
| Witor AS | Østerås | 2016 |
| Witsø Maskin AS | Kyrksæterøra | 1998 |
| Witul & Sønn AS | Vinterbro | 2015 |
| Wiwi AS | Mysen | 2018 |
| WK Bygg Kubik AS | Charlottenlund | 2023 |
| WK Elektro Karlsen AS | Trondheim | 1996 |
| WK Entreprenør AS | Tønsberg | 1998 |
| WK Maler Og Reinhaldservice AS | Volda | 2021 |
| WK Pol Bygg AS | Gran | 2018 |
| Wka Montage GmbH | 08371 Glauchau | 2011 |
| Wka-Beton-Service GmbH | De-13156 Berlin | 2008 |
| Wke AS | Tønsberg | 1967 |
| WLM Norge Nuf | Lt-3201 Talsi | 2025 |
| Wlodzimierz Szymczyk | Pl-89-240 Kcynia | 2012 |
| WM Byggeiendom AS | Son | 2017 |
| WM Maskin AS | Ålesund | 2014 |
| Wman Rekrutacja I Serwis SP Komandytowa Nuf | Pl-80-297 Banino | 2021 |
| WMC Invest AS | Storebø | 2012 |