| Norsk Invest AS | Oslo | 2022 |
| Norsk Investeringsgruppen AS | Porsgrunn | 2019 |
| Norsk Iskrem AS | Hagan | 1989 |
| Norsk Kapitalplassering AS | Hønefoss | 1989 |
| Norsk Kjernekraft AS | Bergen | 2022 |
| Norsk Klimasenter Butikkdrift AS | Stavanger | 2015 |
| Norsk Klimaservice AS | Avaldsnes | 2016 |
| Norsk Kuldeservice AS | Askim | 2011 |
| Norsk Kunstglass AS | Oslo | 2015 |
| Norsk Lettbygg AS | Oslo | 1988 |
| Norsk Maler Proffen AS | Jessheim | 2021 |
| Norsk Malerservice AS | Oslo | 2019 |
| Norsk Maskin AS | Båstad | 2012 |
| Norsk Miljøsanering AS | Kristiansand S | 2024 |
| Norsk Miljøservice AS | Sykkylven | 2013 |
| Norsk Mur AS | Brevik | 2012 |
| Norsk Murerservice AS | Bjørkelangen | 2019 |
| Norsk Områdesikring AS | Porsgrunn | 2011 |
| Norsk Områdesikring Itv AS | Porsgrunn | 2016 |
| Norsk Piperehabilitering AS | Skien | 2016 |
| Norsk Port Service Vest AS | Haus | 1991 |
| Norsk Profil Da | Kråkstad | 2004 |
| Norsk Retningsboring AS | Vestre Åmøy | 2018 |
| Norsk Riving AS | Blomsterdalen | 2015 |
| Norsk Rør & Tank Isolering AS | Moss | 2023 |
| Norsk Rør AS | Trondheim | 1996 |
| Norsk Rørkompani AS | Sørumsand | 2016 |
| Norsk Rørkompetanse AS | Vikersund | 2024 |
| Norsk Rørleggerservice AS | Stange | 2024 |
| Norsk Rørservice AS | Oslo | 2014 |
| Norsk Rørteknikk AS | Nesbru | 2011 |
| Norsk Sol AS | Sparbu | 2019 |
| Norsk Solkraft AS | Tonstad | 2023 |
| Norsk Spesialboring AS | Våle | 2001 |
| Norsk Sprinklerteknikk AS | Porsgrunn | 2017 |
| Norsk Standard Elektro AS | Oslo | 2022 |
| Norsk Stein-Eksport AS | Helgeroa | 2026 |
| Norsk Tak Team AS | Kokstad | 2025 |
| Norsk Takfornying Agder AS | Kristiansand S | 2014 |
| Norsk Takfornying Oslo&Akershus AS | Sætre | 2012 |
| Norsk Teknisk Installasjon AS | Lierstranda | 2010 |
| Norsk Treelement AS | Vrådal | 1998 |
| Norsk Trefiber AS | Sauda | 2023 |
| Norsk Trefiber Sør AS | Farsund | 2025 |
| Norsk Trefiberisolering AS | Ørje | 2024 |
| Norsk Urethan Da | Trondheim | 2001 |
| Norsk Varme AS | Lillehammer | 2026 |
| Norsk Varmepumpe Senter AS | Tertnes | 2020 |
| Norsk Varmeteknikk AS | Brandbu | 2018 |
| Norsk Vegverk AS | Notodden | 2020 |
| Norsk Veiservice AS | Nannestad | 2024 |
| Norsk Ventilasjon AS | Laksevåg | 1991 |
| Norsk VVS Ekspert AS | Skedsmokorset | 2016 |
| Norsk VVS Teknikk AS | Skedsmokorset | 2024 |
| Norsk Vvs-Merking AS | Sandefjord | 1996 |
| Norsk-Bygg AS | Hjartdal | 2017 |
| Norsk-Profil AS | Kråkstad | 2008 |
| Norskbygg AS | Skarnes | 2018 |
| Norske 330 AS | Fjerdingby | 2015 |
| Norske Bæresystemer AS | Oslo | 2011 |
| Norske Filter AS | Ranheim | 1998 |
| Norske Hallsystemer AS | Stange | 2007 |
| Norske Metallfasader AS | Stange | 1996 |
| Norske Mikrohus AS | Oslo | 2021 |
| Norske Varmepumper AS | Tananger | 2023 |
| Norsklita Nuf | Etnedal | 2014 |
| Norsksnekker.No AS | Rykkinn | 2011 |
| Norsnekk Snekkerservice AS | Skien | 2018 |
| Norsok-Vedlikehold AS | Klavestadhaugen | 2025 |
| Norsolar AS | Ålgård | 2014 |
| Norspa Service AS | Kongsberg | 1997 |
| Norst AS | Ålesund | 2013 |
| Norstell Stillas AS | Sandefjord | 2011 |
| Norstrand Holding AS | Straumsgrend | 2005 |
| Norstranda Maskin AS | Kjerringøy | 2021 |
| Norswim Frøyna Service AS | Grimstad | 2026 |
| Nortak AS | Jømna | 2022 |
| Nortak Entreprenør AS | Flisa | 1992 |
| Nortec Entreprenørtjenester AS | Oslo | 2015 |
| Nortek | Vik I Sogn | 2009 |
| Nortek Elektro AS | Åfjord | 1996 |
| Nortek Solution AS | Hønefoss | 2022 |
| Nortek VVS AS | Oslo | 2023 |
| Nortekk AS | Skedsmokorset | 1991 |
| Nortekk Holding AS | Skedsmokorset | 2024 |
| Norteknikk AS | Bodø | 2007 |
| Norteko AS | Skjetten | 2012 |
| Norteko Fiber AS | Skjetten | 2020 |
| Norteko Utemiljø AS | Skjetten | 2020 |
| Norteq AS | Bodø | 2017 |
| North Aquaculture Nuf | Brønnøysund | 2021 |
| North Bud Dawid Las | Pl 77-124 Parchowo | 2016 |
| North Construction AS | Kjøllefjord | 2014 |
| North Construction Team AS | Talvik | 2015 |
| North Fix AS | Lommedalen | 2019 |
| North Homes AS | Oslo | 2022 |
| North Installasjon AS | Oslo | 2015 |
| North Star Salmon 1 AS | Oslo | 2019 |
| North Star Salmon 2 AS | Oslo | 2019 |
| North Sun AS | Moss | 2025 |