| Mobil & IT Levanger AS | Wholesale & retail | 1998 |
| Moj Holding AS | | 2019 |
| Moksnes Park AS | Real estate | 2020 |
| Mollan Gård AS | Agriculture & fishing | 2015 |
| Momarka Grendehus Al | Real estate | 1992 |
| Moment Trafikkskole AS | Education | 2021 |
| Morill AS | Hospitality | 2005 |
| Morten Paulsen AS | Health & social care | 2013 |
| Mosjøen Rådgivning & Utleie AS | Professional & scientific | 2014 |
| Msrom AS | Real estate | 2021 |
| Mto Holding AS | Financial services | 2017 |
| Mule Maskinlag SA | Administrative & support | 2022 |
| Multigame Da | Wholesale & retail | 2004 |
| Munkeby AS | Financial services | 2015 |
| Munkeby Gård- Og Naturbarnehage SA | Education | 2007 |
| Munkeby Herberge AS | Hospitality | 2024 |
| Munkeby Maskinlag SA | Agriculture & fishing | 1999 |
| Munnhulen Eiendom AS | Real estate | 2015 |
| Murmester Sivertsen AS | Construction | 2008 |
| Musikkens Hus SA | Arts & recreation | 1995 |
| Myhrheim Holding AS | | 2021 |
| Møbelhuset Levanger AS | Wholesale & retail | 1989 |
| Naprapat Gøril Hustad AS | Health & social care | 2015 |
| Natchuka AS | Other services | 2021 |
| NATURKANAL1 AS | Information & communication | 2020 |
| Naturnett AS | Information & communication | 2000 |
| Naustet Holding AS | | 2020 |
| Nays AS | Professional & scientific | 2022 |
| Nelius Eiendom AS | Real estate | 2019 |
| Neptunvegen 3 AS | Real estate | 1991 |
| Nesna Drift AS | Real estate | 2022 |
| Nesset Grunneierlag SA | Agriculture & fishing | 1999 |
| Nessø Eiendom AS | Real estate | 2012 |
| Nessø Glass Og Håndtverk-Service AS | Construction | 2002 |
| Nils B Skaar Holding AS | Health & social care | 2023 |
| Nirab AS | Professional & scientific | 1998 |
| Nordhalla AS | Real estate | 2019 |
| Nordic Blu Ocean AS | Transport & logistics | 2019 |
| Nordlys Kupler AS | Wholesale & retail | 2026 |
| Nordsivegen 175 AS | Real estate | 2021 |
| Nordstad Hudpleie & Fotterapi AS | Health & social care | 2023 |
| Nordstrand Holding AS | Financial services | 2005 |
| Nordåkeren 2 Verdal AS | Real estate | 2019 |
| Normilk AS | Manufacturing | 2002 |
| Norsk Energimontasje AS | Construction | 2025 |
| Norsk Lyd AS | Information & communication | 2014 |
| Norsk Skadetakst AS | Professional & scientific | 2025 |
| Nortec Invest AS | Real estate | 2007 |
| Nortroll AS | Manufacturing | 1980 |
| Nova Trekanten AS | Real estate | 2025 |
| Ny Helse AS | Health & social care | 2024 |
| Nyboli Invest AS | Real estate | 2018 |
| Nybrotta Og Omegn Vasslag SA | Water & waste | 2023 |
| Nye T Aunan Maskin AS | Construction | 2025 |
| Nyenget Mek Verksted AS | Manufacturing | 1980 |
| Nær Engros Levanger AS | Wholesale & retail | 1996 |
| O'Korn SA | Agriculture & fishing | 2004 |
| Odd Fellow-Gården AS | Real estate | 1964 |
| OGV139 AS | Real estate | 2016 |
| Oj Multiservice AS | Construction | 2021 |
| Okkenhaug Entreprenør AS | Construction | 2013 |
| Okkenhaug Maskinlag SA | Agriculture & fishing | 1999 |
| Ola Holding AS | Financial services | 2017 |
| Online Media Ans | Information & communication | 2003 |
| Optimal Rygg AS | Health & social care | 2020 |
| Orion Moan AS | Hospitality | 2025 |
| Oskars AS | Hospitality | 1991 |
| Outlet Trøndelag AS | Wholesale & retail | 2003 |
| Oydawi AS | Education | 2020 |
| Paul Okkenhaug-Selskapet SA | Arts & recreation | 2011 |
| Persøy Eiendom AS | Administrative & support | 1993 |
| Persøy Lift & Maskinutleie AS | Administrative & support | 2005 |
| Petter Edna AS | Information & communication | 2020 |
| Pettersplassen Holding AS | | 2021 |
| Pharma Holding Innherred AS | Wholesale & retail | 2017 |
| Professional Communication AS | Education | 2009 |
| Promidt AS | Professional & scientific | 2014 |
| Prosessteknikk AS | Manufacturing | 1997 |
| Prototal AS | Manufacturing | 2010 |
| Psytab AS | Health & social care | 2015 |
| Pulspadel AS | Administrative & support | 2025 |
| Pulverkaffeteateret Da | Arts & recreation | 2024 |
| QPS AS | Manufacturing | 2012 |
| R2A Bemanning AS | Administrative & support | 2025 |
| Rahim Ahmadi AS | Agriculture & fishing | 2014 |
| Ravnfilm AS | Information & communication | 2021 |
| RB Konsult AS | Hospitality | 2023 |
| Regi Eiendom AS | Real estate | 2014 |
| Regi Holding AS | Real estate | 2014 |
| Reinsholm Sør AS | Real estate | 2017 |
| Reistad Melk Da | Agriculture & fishing | 2007 |
| Reitun Maskinlag SA | Administrative & support | 1997 |
| Rennanbakken Maskinlag SA | Agriculture & fishing | 2000 |
| Renterisiko AS | Professional & scientific | 2005 |
| Resgus Holding AS | Financial services | 2021 |
| Retrans Midt AS | Water & waste | 2018 |
| Retura Ir AS | Water & waste | 2003 |
| RG6 Eiendom AS | Real estate | 2020 |
| Rias-Konsum AS | Agriculture & fishing | 2010 |
| Rias-Pakkeri AS | Wholesale & retail | 2010 |