| Mur & Flis AS | Construction | 1995 |
| Mur Og Flislegger AS | Construction | 2014 |
| Musikkverden AS | Wholesale & retail | 2015 |
| Muzet AS | Wholesale & retail | 2012 |
| MV Polfoss AS | Transport & logistics | 2020 |
| MV Svartfoss AS | Transport & logistics | 2020 |
| MVN15 AS | Real estate | 2020 |
| Mydland Eiendom AS | Manufacturing | 1981 |
| Myrbakk Eiendom AS | Real estate | 1993 |
| Myrefjell Hytteutleie AS | Financial services | 2006 |
| Myrhaug Og Hansens El Salg Da | Construction | 1999 |
| Myrland AS | | 2024 |
| Myscreens AS | Wholesale & retail | 2021 |
| Mystore.No AS | Information & communication | 2014 |
| Mytripto AS | Real estate | 2025 |
| Må Eiendom AS | Real estate | 2016 |
| Må Holding AS | Construction | 2016 |
| Må Newco 2 AS | Real estate | 2022 |
| Mål Regnskap AS | Professional & scientific | 2006 |
| Målselv Betongservice AS | Construction | 2004 |
| Målselv Lodge AS | Real estate | 2013 |
| Målselv Salg Og Service AS | Real estate | 2011 |
| Målselvgata 20 AS | Real estate | 2026 |
| Mæhlen Eiendom AS | Real estate | 2005 |
| Mælen Holding AS | Real estate | 2005 |
| Møbelgalleriet Tromsø AS | Wholesale & retail | 2004 |
| Møbelringen Tromsø AS | Wholesale & retail | 2021 |
| Møllestad Holding AS | Real estate | 2005 |
| Mølmen Holding AS | | 2026 |
| Møysalen AS | Wholesale & retail | 2002 |
| N J Bunker AS | Wholesale & retail | 1989 |
| N Soul Adventures AS | Administrative & support | 2023 |
| N.Ai AS | Information & communication | 2023 |
| Na Holding AS | Real estate | 2020 |
| Nacapa Invest AS | Real estate | 2013 |
| Nakkevatnet Grunneierlag SA | Arts & recreation | 1987 |
| Namnam Nord AS | Hospitality | 2025 |
| Nanospacer AS | Professional & scientific | 2025 |
| Nansen Outdoor Store Tromsø AS | Wholesale & retail | 2012 |
| Nanu - Sámi Arts International AS | Arts & recreation | 2025 |
| Napoleon Eiendom AS | Real estate | 2019 |
| Napoleon Finnsnes AS | Real estate | 2009 |
| Napoleon Invest AS | Real estate | 2001 |
| Napoleon Vadsø AS | Real estate | 2008 |
| Naprapatdoktoren AS | Health & social care | 2015 |
| Naprapatklinikk Nord AS | Health & social care | 2017 |
| Narra AS | Hospitality | 2024 |
| Natiluos Unlimited Energy AS | Wholesale & retail | 2023 |
| Nattugla AS | Professional & scientific | 2025 |
| Natur I Nord AS | Professional & scientific | 2013 |
| Natur Og Samfunn AS | Professional & scientific | 2017 |
| Natur Og Utfordring AS | Arts & recreation | 2004 |
| Naturtjenester AS | Professional & scientific | 2020 |
| Nazari Showkat AS | Transport & logistics | 2026 |
| Negroni Holding AS | Professional & scientific | 2017 |
| Nemistech AS | | 2021 |
| Nergård AS | Manufacturing | 1992 |
| Nergård Havfiske AS | Agriculture & fishing | 1947 |
| Nergård Seafood AS | Wholesale & retail | 2010 |
| Nerstranda Restaurantdrift AS | Hospitality | 2018 |
| Nerstranda Smykker Og Klokker AS | Wholesale & retail | 2016 |
| Nesenra AS | Wholesale & retail | 2005 |
| Nesland Da | Wholesale & retail | 2005 |
| Ness Holding AS | | 2000 |
| Netglass Totalfasade AS | Construction | 2015 |
| Netrom Tromsø AS | Real estate | 2014 |
| Nexio Bil AS | Wholesale & retail | 2026 |
| NF - Kurs & Kompetansesenter AS | Real estate | 2010 |
| NF - Utleie AS | Real estate | 2012 |
| NG Eiendom Nord AS | Real estate | 1990 |
| Nikkeby Lufthavn Da | Arts & recreation | 2020 |
| Nikolai Schirmer AS | Information & communication | 2022 |
| Nils Sørheim AS | Health & social care | 1994 |
| NILSTE33 Invest AS | | 2023 |
| Nina Casting & Costumes AS | Professional & scientific | 2013 |
| Nina Hansen Invest AS | | 2017 |
| Nina Og Lasse Rød AS | Hospitality | 2005 |
| Ninja Bygg AS | Construction | 2025 |
| Nitty Gritty AS | Hospitality | 2018 |
| Njord Adventures AS | Arts & recreation | 2025 |
| NKV Holding AS | | 2024 |
| NLR Eiendom AS | Real estate | 2020 |
| Nnhm AS | Manufacturing | 2022 |
| No Dig Miljø AS | Professional & scientific | 2019 |
| No Stress Tromsø AS | Hospitality | 2022 |
| NO.24 Tromsø AS | Hospitality | 2002 |
| Noda+ AS | Professional & scientific | 2021 |
| Nofi Butikken AS | Wholesale & retail | 2026 |
| Nofima AS | Professional & scientific | 2005 |
| Noj Holding AS | | 2020 |
| Nomad Collective AS | Administrative & support | 2026 |
| Nomade Eiendom AS | Real estate | 2016 |
| Nomi Nordmiljø AS | Construction | 1990 |
| Nonne AS | Arts & recreation | 2023 |
| Nook & Nuzzle AS | Real estate | 2024 |
| Noor Produksjoner Ans | Arts & recreation | 2007 |
| Nor Dental AS | Manufacturing | 1994 |
| Nor Diesel AS | Other services | 1998 |
| Nor Solution AS | Wholesale & retail | 2019 |
| Nor-A. AS | Real estate | 2009 |