| Multichoise AS | Professional & scientific | 2021 |
| Multiservice Trondheim AS | Transport & logistics | 2019 |
| Munkegata Invest AS | Real estate | 2021 |
| Mur & Flisteknikk AS | Construction | 2014 |
| Murspesialisten AS | Construction | 2015 |
| Myauto AS | Wholesale & retail | 2020 |
| Mæhle Invest AS | | 2023 |
| Møkkelgård Invest AS | Real estate | 2007 |
| Møllegaard Invest AS | Financial services | 2013 |
| Naukatek AS | Manufacturing | 2017 |
| Navisani Norge AS | Wholesale & retail | 2025 |
| Nawi AS | Construction | 2005 |
| NBG Holding AS | Real estate | 2023 |
| Nedre Bakklandet Næring Holding AS | Real estate | 2021 |
| Nedre Møllenberggate 38 AS | Real estate | 2005 |
| Nesshaug Holding AS | Wholesale & retail | 2023 |
| New Business AS | Wholesale & retail | 2002 |
| Nidaros - Eiendomsmegling AS | Real estate | 2023 |
| Nidaros Egg AS | Agriculture & fishing | 2023 |
| Nidaros Lyd AS | Arts & recreation | 2025 |
| Nidaros Salg Og Markedsføring AS | Hospitality | 2024 |
| Nidelv Elektro AS | Construction | 2025 |
| Nina Rønning Holding AS | Financial services | 2005 |
| Noiv Holding AS | | 2021 |
| Nonnegata 12 AS | Real estate | 2011 |
| Nopro AS | Real estate | 2023 |
| Nopro Drift AS | Transport & logistics | 2024 |
| Norack AS | Wholesale & retail | 1990 |
| Norbridge AS | Construction | 2010 |
| Nord Entreprenør AS | Construction | 2002 |
| Nordenfjeldske Boliger AS | Real estate | 2018 |
| Nordenfjeldske Eiendomsforvaltning AS | Real estate | 1988 |
| Nordenfjeldske Tak & Bygg AS | Construction | 2024 |
| Nordic Bike Spa AS | Wholesale & retail | 2025 |
| Nordic Tak AS | Construction | 2021 |
| Nordlund Eiendom AS | Real estate | 2011 |
| Nordlys Apartments AS | Real estate | 2023 |
| Nordre Gate 4 Trondheim AS | Real estate | 2022 |
| Nordre GT 4 AS | Real estate | 2022 |
| Nordset Industripark AS | Real estate | 2021 |
| Norsk Brannsikring AS | Construction | 2020 |
| Norsk Produksjon Holding AS | Arts & recreation | 2021 |
| Norske Tannproteser AS | Health & social care | 1988 |
| Northtrace AS | Information & communication | 2026 |
| Nostaris AS | Education | 2021 |
| Nova Økonomi AS | Professional & scientific | 2025 |
| Npro AS | Arts & recreation | 2021 |
| Npro Messe AS | Administrative & support | 2021 |
| Nsa AS | | 2026 |
| Ntec AS | Professional & scientific | 2024 |
| Numos Regnskap Og Rådgivning AS | Professional & scientific | 2024 |
| Nye Nidaros Parkettsliperi Ans | Construction | 1997 |
| Nytt Vindu AS | Professional & scientific | 2011 |
| Nærverk AS | Professional & scientific | 2025 |
| O.Mikkelsen AS | Wholesale & retail | 2023 |
| Odd Forseth AS | Manufacturing | 2001 |
| Oeg Tegnekontor AS | Construction | 2005 |
| Ofstad Invest AS | Hospitality | 2022 |
| Oil Eiendom AS | Real estate | 2019 |
| Oil Holding AS | Construction | 2012 |
| Oisinvest AS | Financial services | 2018 |
| Ojako Holding AS | | 2024 |
| Olesen Teaching AS | Education | 2025 |
| Omf Invest AS | Financial services | 2014 |
| Omicron Automasjon AS | Construction | 2007 |
| Omicron Service AS | Construction | 2007 |
| On Hydraulikk AS | Professional & scientific | 2018 |
| Oppdal Hiba-Hytter AS | Real estate | 2007 |
| Oppmåling AS | Professional & scientific | 2024 |
| Orkanger Eiendom AS | Real estate | 2007 |
| Orkedalsveien 58 AS | Real estate | 2003 |
| Ottar Augdal AS | Construction | 1986 |
| Oyvindhauge Invest AS | | 2022 |
| P. Rishaug Invest AS | | 2023 |
| Pallekarmen AS | | 1989 |
| Panoptes AS | Professional & scientific | 2014 |
| Parabolic Holding AS | Information & communication | 2026 |
| Pari Eiendom AS | Real estate | 2002 |
| Partytime Trondheim AS | Wholesale & retail | 2016 |
| Pasta Bar AS | Hospitality | 2023 |
| Pawel Service AS | Administrative & support | 2022 |
| PC Eiendom Heimdal AS | Real estate | 2024 |
| Peak to Peak Consulting AS | Professional & scientific | 2022 |
| Peder Hiortgata 2 AS | Real estate | 2026 |
| Peder Myhres Veg AS | Real estate | 2010 |
| Peder Myhres Veg Holding AS | Real estate | 2018 |
| Pehr AS | Real estate | 2014 |
| Pemel Holding AS | Real estate | 2017 |
| Pento Eiendom AS | Real estate | 2006 |
| Perend AS | | 2025 |
| Phmw AS | Information & communication | 2020 |
| Phoenix Ace AS | | 2020 |
| Pilot Anlegg AS | Administrative & support | 2020 |
| Pilot Eiendom AS | Real estate | 2006 |
| Pilot Rentals AS | Administrative & support | 2004 |
| Pilot Utleie AS | Administrative & support | 2001 |
| Pilotveien 21 Kristiansund AS | Real estate | 2023 |
| Pitch Studio AS | Professional & scientific | 2022 |
| Planscape Pro AS | Information & communication | 2025 |
| PM Boligstyling AS | Professional & scientific | 2014 |