| Musum Eiendom AS | Real estate | 1990 |
| Musum Eiendom Leksdal AS | Real estate | 2026 |
| Musum Holding AS | Real estate | 2007 |
| Musum Invest AS | | 2026 |
| Musum Transport AS | Transport & logistics | 2018 |
| MVN8 AS | Real estate | 2022 |
| Myran Eiendom AS | Real estate | 2021 |
| Namdal Pukkverk AS | Mining & quarrying | 2000 |
| Neptunvegen 1 AS | Real estate | 2024 |
| Neptunvegen 2B AS | Real estate | 2012 |
| Neptunvegen 5 AS | | 2025 |
| Nervi Eiendom AS | Real estate | 2016 |
| Ness-Vangstad Byggservice AS | Construction | 2020 |
| Ness-Vangstad Eiendom AS | Real estate | 2020 |
| Ness-Vangstad Holding AS | Construction | 2020 |
| Nessbøgda Maskinlag SA | Agriculture & fishing | 2013 |
| Nessemo Eiendom AS | Real estate | 1987 |
| Nessveet 4 AS | Real estate | 2020 |
| Nessø Holding AS | Real estate | 2023 |
| Nessø Lakkering AS | Other services | 2022 |
| Nicco Consept AS | Wholesale & retail | 2012 |
| Niro Bygg AS | Construction | 2021 |
| Nord Suvenir AS | Wholesale & retail | 2006 |
| Nordbohus Byggservice AS | Construction | 1985 |
| Nordbohus Utvikling AS | Real estate | 2014 |
| Nordgata 22 AS | Real estate | 2009 |
| Nordgata 24 AS | Real estate | 2014 |
| Nordgata 25 AS | Real estate | 2022 |
| Nordic Energy AS | Energy | 2012 |
| Nordic Hunt AS | Wholesale & retail | 1998 |
| Nordic Wind AS | Energy | 2017 |
| Norfrakalk AS | Manufacturing | 2004 |
| Norgesfrakt AS | Transport & logistics | 2021 |
| Norgestak Eiendom AS | Real estate | 2018 |
| Norgestak Norge AS | Construction | 2019 |
| Norgestak Trondheim AS | Construction | 2019 |
| Norgestak Trøndelag AS | Construction | 2015 |
| Norgestak Vest AS | Construction | 2024 |
| Norsk Konstruksjonsrådgivning AS | Professional & scientific | 2019 |
| Norsk Spon AS | Manufacturing | 2010 |
| North Horizon AS | | 2023 |
| Novasjon Holding AS | Real estate | 2005 |
| NS Eiendom AS | Real estate | 1986 |
| Nye Enes Og Olsen Holding AS | | 2024 |
| Nye Tertio AS | | 2024 |
| Nyvegbakken 21 AS | Real estate | 2017 |
| O Eilertsen Eiendom AS | Real estate | 2025 |
| O Eilertsen Holding AS | | 2025 |
| O-V Holding AS | | 2026 |
| O.J.T. Holding AS | | 2024 |
| Oaba Holding AS | Financial services | 2016 |
| Oal Holding AS | Administrative & support | 2018 |
| Ocean Geoloop ASA | Water & waste | 2020 |
| Odd M Kvelstad AS | Arts & recreation | 2022 |
| Odin Granheim AS | | 2025 |
| Oestgaard AS | Professional & scientific | 2023 |
| Ohansen Eiendom AS | Real estate | 2026 |
| Oib Holding AS | Financial services | 2017 |
| Omatreats AS | Wholesale & retail | 2024 |
| Omnitech AS | Professional & scientific | 2012 |
| One O One AS | Wholesale & retail | 2009 |
| Onia Holding AS | | 2025 |
| Opf Holding AS | | 2022 |
| Opplæringskontoret for Byggfagene I Trøndelag SA | Education | 1996 |
| Otts Verdal Transportsentral AS | Transport & logistics | 1978 |
| Overmo AS | Wholesale & retail | 2012 |
| Peas Holding AS | Wholesale & retail | 2006 |
| Pedersen Regnskap AS | Professional & scientific | 2026 |
| Perlen AS | Wholesale & retail | 2009 |
| Perrongen Verdal AS | Real estate | 2004 |
| Petter Nervik AS | Manufacturing | 1975 |
| Petter Nervik Bakeri AS | Manufacturing | 2007 |
| Pixmed Medical Communication AS | Information & communication | 2006 |
| PLM AS | Real estate | 2020 |
| Pokéfriends AS | Wholesale & retail | 2025 |
| Presis Montering AS | Wholesale & retail | 2007 |
| PRO5 Holding AS | Professional & scientific | 2017 |
| Proff-Rør AS | Construction | 2003 |
| Profil-Trøkk AS | Manufacturing | 2015 |
| Profilman AS | Professional & scientific | 2025 |
| Proinvest Holding AS | Financial services | 2007 |
| Proneo AS | Professional & scientific | 2007 |
| Prospect Band Da | Arts & recreation | 2018 |
| Prøven Eiendom Verdal AS | Real estate | 1970 |
| PS Byggdrift Da | Construction | 2009 |
| Påhold AS | | 2023 |
| Pål Benum AS | Financial services | 2014 |
| Pål Hofstad Consulting AS | Professional & scientific | 2020 |
| Qva AS | Professional & scientific | 2026 |
| R. Karlsen Invest AS | | 2024 |
| R.B.O. Invest AS | | 2023 |
| Rago Eiendom AS | Real estate | 2023 |
| Ral VVS AS | Construction | 2021 |
| Ramsta Holding AS | | 2024 |
| Randis Gatekjøkken AS | Hospitality | 2014 |
| Regionalt Pilegrimssenter Stiklestad AS | Administrative & support | 2016 |
| Regnskapssenteret Verdal AS | Professional & scientific | 2010 |
| Regulus Holding AS | Financial services | 2013 |
| Renell AS | Professional & scientific | 2017 |
| Reolmontering AS | Construction | 2014 |