| North Utvikling AS | Tromsø | 2013 |
| Northcoat AS | Eikelandsosen | 2025 |
| Northerm Service AS | Asker | 2018 |
| Northern Construction Sia | Krimulda County Lv2144 | 2016 |
| Northern Escalator Installations LLP Nuf | Hx3 7Ty Halifax | 2018 |
| Northern Light Bygg Og Eiendom AS | Stamsund | 2020 |
| Northern Sprinkler Systems Limited | South Yorkshire Dn4 6Tf | 2017 |
| Northern Subsea and Diving Agency AS | Kvaløya | 2014 |
| Northern Tone Service AS | Sundbyfoss | 2016 |
| Northland Skateparks AS | Oppegård | 2024 |
| Northwood AS | Duken | 2022 |
| Norti AS | Vuku | 2024 |
| Nortrade Group AS | Strømmen | 2017 |
| Nortron AS | Haugesund | 2014 |
| Nortronik AS | Førde | 2009 |
| Nortronik Prosjekt AS | Førde | 2021 |
| Norum Kulde AS | Bodø | 2025 |
| Norvag Byggsystem AB V/Byrået I Son AS | Son | 2005 |
| Norvald Jørgensen AS | Gibostad | 2016 |
| Norvald Olsen AS | Nå | 2008 |
| Norvann AS | Lier | 2002 |
| Norvann Holding AS | Lier | 2007 |
| Norvei AS | Hof | 2006 |
| Norvent AS | Leknes | 1998 |
| Norvent Ventilasjon AS | Våle | 2015 |
| Norvik Og Eriksen AS | Strømmen | 2015 |
| Norvind Utvikling AS | Ankenes | 2026 |
| Norvista AS | Solbergmoen | 2025 |
| Norvo AS | Fjellhamar | 2026 |
| Norvoll AS | Flatdal | 2013 |
| Norvågen AS | Sandhornøy | 2020 |
| Norwaylodge AS | Oslo | 2024 |
| Norwegian Group AS | Volda | 2020 |
| Norwegian Pipeline Drilling AS | Stavanger | 1993 |
| Norwegian Rail Service AS | Oslo | 2014 |
| Norwegian Service Team Byggservice AS | Avaldsnes | 1997 |
| Norwegian Service Team Industries AS | Avaldsnes | 1995 |
| Norwegian Wood Floor Sandings & Joinery | Dunfermline Ky11 3Bw Scotland | 2019 |
| Norwig AS | Lysekloster | 2006 |
| Norwind Breeze AS | Ålesund | 2022 |
| Norwind Gale AS | Ålesund | 2023 |
| Norwind Helm AS | Ålesund | 2023 |
| Norwind Hurricane AS | Ålesund | 2023 |
| Norwind Shipholding AS | Ålesund | 2013 |
| Norwind Storm AS | Ålesund | 2023 |
| Norx Entreprenør AS | Sandefjord | 2023 |
| Norå AS | Harstad | 2007 |
| Norør AS | Os | 1985 |
| Norør Holding AS | Os | 2005 |
| Nos AS | Moss | 2016 |
| Nos Elektro AS | Randaberg | 2024 |
| Nossek Invest AS | Skien | 2013 |
| Nossum Rør AS | Oslo | 2006 |
| Noste Bygg AS | Varangerbotn | 2021 |
| Noste Danielsen Graveservice AS | Pasvik | 2020 |
| Nostrum AS | Oslo | 2015 |
| Notbygg AS | Notodden | 2022 |
| Notech Industrial Services SRL | 30075 Bucharest District 3 | 2014 |
| Notekta AS | Lakselv | 2021 |
| Notodden Anleggsdrift AS | Notodden | 2024 |
| Notodden Byggentreprenør AS | Notodden | 2020 |
| Notodden Glass & Aluminium AS | Notodden | 1987 |
| Notodden Kobber & Blikk AS | Notodden | 2018 |
| Notodden Maskin & Utleie AS | Notodden | 2012 |
| Notodden Rørleggerforretning AS | Notodden | 1989 |
| Notodden Tapet Og Gulv AS | Notodden | 2014 |
| Notodden Varmepumper AS | Notodden | 2017 |
| Notting Holding AS | Vestfossen | 2018 |
| Nova Bergen AS | Nesttun | 2007 |
| Nova Blikk Og Ventilasjon AS | Drammen | 2014 |
| Nova Bygg AS | Trondheim | 2016 |
| Nova Bygg Lier AS | Drammen | 2017 |
| Nova Con AS | Langhus | 2014 |
| Nova Dekor AS | Fjerdingby | 2024 |
| Nova Drift AS | Hegra | 2018 |
| Nova Elektro AS | Stavanger | 2006 |
| Nova Gruppen Holding AS | Drammen | 2017 |
| Nova Gulv- Og Malertjenester AS | Spillum | 2014 |
| Nova Mont AS | Bjørkelangen | 2021 |
| Nova Ofoten AS | Ankenes | 2019 |
| Nova Rørservice AS | Oslo | 2025 |
| Nova Solskjerming AS | Kolsås | 2026 |
| Nova Ventilasjonsrens AS | Bergen | 2025 |
| Nova Water Solutions AS | Lysaker | 2025 |
| Novar VVS AS | Oslo | 2025 |
| Novatec S.R.L | It-31056 Roncade (Tv) | 2011 |
| Novatek Invest AS | Bodø | 2005 |
| Nove AS | Stord | 2019 |
| Novel Eiendom AS | Oslo | 2020 |
| Novembrini Malermeister AS | Risør | 2012 |
| Noveta AS | Hvalstad | 1992 |
| Novi Eiendom AS | Oslo | 2024 |
| Novi Security Systems AS | Oslo | 2022 |
| Novium Entreprenør AS | Oslo | 2018 |
| Novo Entreprenør AS | Oslo | 2018 |
| Novodiem AB Nuf | Dk-2200 København N | 2026 |
| Novotak AS | Stokke | 2024 |
| Novus Bygg AS | Harstad | 2024 |
| Nowek Pawel Nowogorski | 20-442 Lublin | 2016 |
| Nowex Pawel Nowogorski | 20442 Lublin | 2010 |