| Namsos Boligeiendom AS | Real estate | 2019 |
| Namsos Båt Og Diesel AS | Manufacturing | 2014 |
| Namsos Eiendom AS | Real estate | 2011 |
| Namsos Eiendomsinvest AS | Real estate | 2020 |
| Namsos Eiendomsmegling AS | Real estate | 2023 |
| Namsos Fysioterapi AS | Health & social care | 2012 |
| Namsos Gulv Og Malerservice AS | Construction | 2024 |
| Namsos Handelspark AS | Real estate | 2005 |
| Namsos Handelspark III AS | Real estate | 2006 |
| Namsos Helsebygg AS | Construction | 2013 |
| Namsos Holding AS | Wholesale & retail | 2021 |
| Namsos Industribyggeselskap AS | Real estate | 1970 |
| Namsos Live AS | Arts & recreation | 2019 |
| Namsos Minilager AS | Real estate | 2016 |
| Namsos Musikkbarnehage AS | Education | 2003 |
| Namsos Padel AS | Arts & recreation | 2024 |
| Namsos Rør AS | Construction | 2017 |
| Namsos Sykkelsenter AS | Wholesale & retail | 2017 |
| Namsos Tannlegesenter AS | Health & social care | 2020 |
| Namsos Taxi AS | Transport & logistics | 2018 |
| Namsos Taxi SA | Transport & logistics | 1981 |
| Namsos Trafikkselskap AS | Arts & recreation | 2021 |
| Namsos Veterinærkontor AS | Professional & scientific | 2017 |
| Namsosjarlen AS | Administrative & support | 2021 |
| Namsosmartnan AS | Administrative & support | 2012 |
| Namsosramp Da | Arts & recreation | 2005 |
| Namsosrock Da | Arts & recreation | 2007 |
| Natur & Idrettsbarnehagen Bråten AS | Education | 2005 |
| Natur & Idrettsbarnehagen Høknes AS | Education | 2022 |
| Nava Dame AS | Wholesale & retail | 1990 |
| Nava Holding AS | Real estate | 2010 |
| Nava Sport AS | Wholesale & retail | 1989 |
| Nava Sport Drift AS | Administrative & support | 2018 |
| Nava Sport Mosjøen AS | Wholesale & retail | 2016 |
| Nava Sport Verdal AS | Wholesale & retail | 2007 |
| Navarvegen 13A AS | Real estate | 2026 |
| NBF Drivstoff AS | Wholesale & retail | 2016 |
| NBV Drift AS | Construction | 2022 |
| Neo Eiendom AS | Construction | 2006 |
| Neptun Eiendom AS | Real estate | 1997 |
| Neptun Salmo AS | Agriculture & fishing | 1990 |
| NHB Eiendom AS | Real estate | 2026 |
| Niklas Angelus Invest AS | Health & social care | 2012 |
| Nmi Eiendom AS | Real estate | 2006 |
| Norde Vemundvik Beitelag SA | Agriculture & fishing | 2014 |
| Norsk Audio Produksjon AS | Arts & recreation | 1987 |
| Norsk Iso AS | Manufacturing | 2020 |
| Norsk Underholdningsmedisinsk Institutt AS | Health & social care | 2009 |
| Norsk Villaks AS | Wholesale & retail | 2018 |
| Norwegian Drilling Company AS | Professional & scientific | 2021 |
| Notrevi AS | Real estate | 2016 |
| Nuf Norge Invest Limited | | 2011 |
| Nufsfjord Vasslag SA | Water & waste | 2024 |
| Nyarc AS | Professional & scientific | 2005 |
| Nye Hustad Eiendom AS | Real estate | 2022 |
| Nynes Invest AS | | 2024 |
| Nyor Management AS | Financial services | 2020 |
| Nyor Økonomi AS | Professional & scientific | 2025 |
| Nær Engros AS | Wholesale & retail | 1997 |
| Nær Engros Cash & Carry AS | Wholesale & retail | 2015 |
| Nær Trans AS | Transport & logistics | 2000 |
| Nøsthaugen AS | Financial services | 2017 |
| O.C. Dahl AS | Wholesale & retail | 2004 |
| Odd Hjelpe AS | Wholesale & retail | 2026 |
| Odd Ingebrigtsen AS | Wholesale & retail | 1971 |
| Odin Eiendommer AS | Real estate | 2020 |
| Oi Eiendom AS | Real estate | 2019 |
| Oi Holding AS | Real estate | 2008 |
| Ola-Kaviar AS | Real estate | 2006 |
| Olaiosen AS | Health & social care | 1998 |
| Olderstad Formidling AS | Wholesale & retail | 2021 |
| Olderstad Holding AS | Wholesale & retail | 2021 |
| Ole Bruun Olsen AS | Wholesale & retail | 1994 |
| Omic Naprapati AS | Health & social care | 2014 |
| Opal Maritime AS | Agriculture & fishing | 2013 |
| Oppned AS | | 2022 |
| Ops AS | Administrative & support | 2025 |
| Ori Holding AS | Real estate | 2008 |
| Osloveien 17 Trondheim AS | Real estate | 2006 |
| Osloveien 19 AS | Real estate | 2014 |
| Osloveien 23 Trondheim AS | Real estate | 2014 |
| Otterbekk Bil AS | Wholesale & retail | 2021 |
| Otto Moe Bilutleie AS | Administrative & support | 1993 |
| Otto Moe Eiendom AS | Real estate | 1999 |
| Otto Moe Eiendom Grong AS | Real estate | 2020 |
| Otto Moe Eiendom Rørvik AS | Real estate | 2020 |
| Otto Moe Holding AS | Real estate | 2020 |
| P.G Trafikkopplæring AS | Education | 2017 |
| Papa Rock AS | Wholesale & retail | 2019 |
| Partner Trend AS | Wholesale & retail | 2005 |
| Perspektiv Psykologklinikk AS | Health & social care | 2026 |
| Petras Verden AS | Information & communication | 2023 |
| Pinaveien 6 AS | Real estate | 2012 |
| Piotr Holding AS | Health & social care | 2017 |
| PLAN3 Arkitektur AS | Professional & scientific | 2008 |
| PMD Investment AS | | 2025 |
| Prestegårdsstien 5 AS | Real estate | 2019 |
| Prestegårdsstien 6 AS | Real estate | 2015 |
| Proea Capital AS | Professional & scientific | 2020 |
| Pæng AS | Arts & recreation | 2007 |