| WMM AS | Hammerfest | 2025 |
| WMM Maskinentreprenør AS | Hammerfest | 2021 |
| Wmot Holding AS | Kvaløya | 2017 |
| WMP Fagmann Bygg AS | Fåvang | 2026 |
| Woc Hus I Uddevalla KB | Se-451 55 Uddevalla | 2011 |
| Wogn Holding AS | Sjetnemarka | 2021 |
| Wojchiech Grzeskowiak Domel | 80 288 Gdansk | 2005 |
| Wojcicki Dariusz | 26-600 Radom | 2009 |
| Wojciech Dzielski Yeti Ustugi Remontowo - Budowlane | Pl-32-444 Glogoczow | 2019 |
| Wojciech Herdus | Narvik | 2008 |
| Wojciech Laga | 84-230 Rumia | 2006 |
| Wojciech Leniartek P.H.U Fullinstal | Pl-32-050 Skawina | 2024 |
| Wojciech Makuszewski | Tønsberg | 2006 |
| Wojciech Michal Grabowski | 83-130 Peplin | 2005 |
| Wojtek Bygg Renovering AS | Vestby | 2011 |
| Wolckmar Bygg AS | Skien | 2022 |
| Wolckmar Holding AS | Skien | 2022 |
| Wold AS | Isfjorden | 2018 |
| Wold Blikk & Ventilasjon AS | Skiptvet | 2012 |
| Wold Bygg AS | Rygge | 2025 |
| Wold Drenering & Graving AS | Skiptvet | 2026 |
| Wolden Bygg AS | Agdenes | 2019 |
| Wolden Maskin AS | Tverlandet | 2005 |
| Wolden Melhus AS | Oppdal | 2020 |
| Woldengen AS | Oslo | 2020 |
| Wolfram Transport AS | Åmot | 2019 |
| Wollebæk Maskin AS | Stange | 2021 |
| Womar Wojciech Poczatek | Pl-43-150 Bierun | 2019 |
| Wood & Tiles Nuf | Balestrand | 2009 |
| Wood AS | Oslo | 2021 |
| Wood Bygg AS | Gjerdrum | 2024 |
| Wood Expro Nuf | Rakkestad | 2011 |
| Woodbau SPO1 Sro Nuf | Knarrevik | 2009 |
| Woodfloors AS | Lørenskog | 2024 |
| Woodland Property AS | Nesøya | 2021 |
| Woodmasters Kamil Lipinski Nuf | Pl-87-640 Czernikowo | 2017 |
| Woodpekkers AS | Randaberg | 2023 |
| Woodsaw Nuf | Ee-65606 Voru City, Voru County | 2015 |
| Woodstock Naturlige Bygg AS | Nordre Frogn | 2021 |
| Woodstyle AS | Drøbak | 2020 |
| Woodstyle Bygg AS | Drøbak | 2011 |
| Woodworking Solution Limited | Warwickshire Cv13 0Bb | 2015 |
| Woodworks AS | Spydeberg | 2022 |
| Wopekx AS | Oslo | 2008 |
| Work House SRL | It-40138 Bologna | 2021 |
| Work of Time AS | Høvik | 2023 |
| Workinn AS | Tromsø | 1993 |
| Workinngruppen AS | Tromsø | 2019 |
| Workman AS | Oslo | 2011 |
| Works L&W Group S.R.O | Sandnes | 2012 |
| World Natural Energy AS | Lørenskog | 2020 |
| Worms VVS & Industriteknik Aps | Dk-9700 Brønderslev | 2015 |
| Worrtekk AS | Valestrandsfossen | 2020 |
| Wosa Invest AS | Rud | 2020 |
| Woto AS | Åmot | 2018 |
| WR Bygg AS | Isfjorden | 2023 |
| WR Hus AS | Isfjorden | 2018 |
| WR Maskin AS | Osen | 2005 |
| Wredler Projektledning | Se-83792 Mörsil | 2025 |
| Wright Invest AS | Slattum | 2014 |
| Wright Maskin AS | Krokelvdalen | 2016 |
| Wright VVS & Spyleservice AS | Krokelvdalen | 2012 |
| WRK Renovering AS | Flekkerøy | 2018 |
| Wroldsen AS | Oslo | 2004 |
| Wrona BRT Nuf | Pl-39-107 Niedzwiada | 2016 |
| WS Bygg AS | Bekkestua | 2023 |
| WS Elcon AB | Se-668 92 Ed | 2021 |
| WS Maskin Og Eiendom AS | Hauglandshella | 2023 |
| WSB Eiendom AS | Saltstraumen | 2018 |
| WT Anlegg AS | Drammen | 2011 |
| WTS Rail AS | Ålesund | 2013 |
| WTT Service Aps | Dk-7330 Brande | 2018 |
| Wulf AS | Knarrevik | 2025 |
| Wulf Holding AS | Finnsnes | 2015 |
| Wulf Invest AS | Finnsnes | 2013 |
| Wulff Service & Montasje Limited Nuf | Holter | 2025 |
| WV Invest AS | Stavanger | 2022 |
| WW Service Mikolaj Walendzik | Pl-05300 Minsk Mazowiecki | 2020 |
| WW Tak Og Blikk AS | Fjerdingby | 2023 |
| WWK Elektro AS | Oslo | 2020 |
| WWL Houses | Lv-Riga 1055 | 2013 |
| Wwrørlegger AS | Jessheim | 2024 |
| WWS Wasserkraft GmbH | At-4120 Neufelden | 2025 |
| WWV Reschlo Maastricht BV | 6222 Nz Maastricht | 1999 |
| WWV Wärmeverwertung GmbH & Co KG | 28211 Bremen | 2007 |
| WWV Wärmeverwertung GmbH & Co.Kg | De-76870 Kandel | 2005 |
| Wypozyczalnia Sprzetu Budowlanego I Uslugi Ogolnobudowlane Ewelina Galkiewicz Nuf | 13-330 Bratian | 2026 |
| Wyx AS | Moss | 2019 |
| Willy J Nilsen AS | Stavanger | 1982 |
| Wächter Ladenbau GmbH | De-28876 Oyten | 2021 |
| Wå Invest AS | Sauda | 2019 |
| Wågbø Bygg Og Betong AS | Sunndalsøra | 2018 |
| Wöhr Autoparksysteme GmbH | De-712 92 Friolzheim | 2018 |
| Wünder AS | Solbergelva | 2022 |
| Würz GmbH Rekuperative Wärmetechnik | De-47877 Willich | 2018 |
| X Anlegg AS | Hønefoss | 2020 |
| X Anlegg Flage Ans | Voss | 2014 |
| X Betong AS | Skodje | 2013 |
| X Rør AS | Gan | 2022 |
| X Vent Aps | Dk-6040 Egtved | 2017 |