| Micatso AS | Financial services | 2005 |
| Millermorland AS | Wholesale & retail | 2016 |
| Millermorland Holding AS | Real estate | 2006 |
| Milmil Invest AS | Hospitality | 2023 |
| Milwali AS | | 2026 |
| Minerom.No AS | Wholesale & retail | 2026 |
| Mivida Anlegg AS | Construction | 2022 |
| Mjevik AS | | 2025 |
| MKB20 AS | Real estate | 2023 |
| Mobilt Serviceverksted AS | Other services | 2025 |
| Mocoll AS | Wholesale & retail | 2024 |
| Mojo Restaurant AS | Hospitality | 1977 |
| Molland Consulting AS | Professional & scientific | 2015 |
| Mons Gregersen AS | Construction | 1997 |
| Mor Kristins Vei 4 Og 6 AS | Real estate | 2019 |
| Moring AS | Professional & scientific | 2019 |
| Moskvil Holding AS | Professional & scientific | 2017 |
| Motho Properties AS | Real estate | 2021 |
| MSH RX AS | Professional & scientific | 2020 |
| MT Åsen AS | Professional & scientific | 2008 |
| Murerfirma Frode Johansen AS | Construction | 2014 |
| Murmester T Pettersen AS | Construction | 2006 |
| Musikalsk Tapas Da | Arts & recreation | 2025 |
| My Eiendom AS | Real estate | 2011 |
| Myto Holding AS | Real estate | 2011 |
| Møbelhuset Holmestrand AS | Wholesale & retail | 2017 |
| Møllerdammen Naturbarnehage AS | Education | 2007 |
| Mørk Invest AS | | 2016 |
| N Byggservice AS | Construction | 2026 |
| Nakjem Vaktmestertjenester AS | Administrative & support | 2024 |
| Native Software AS | Information & communication | 2022 |
| Native X AS | Information & communication | 2023 |
| Naturalis AS | Wholesale & retail | 2012 |
| Navipro AS | Information & communication | 2003 |
| NB Bygg AS | Construction | 2022 |
| Neva Eiendom AS | Real estate | 2021 |
| New Line AS | Wholesale & retail | 1986 |
| New West Gipsgjenvinning AS | Water & waste | 2017 |
| New West Gypsum Recycling (Norway) AS | | 2017 |
| Nistor Bygg AS | Construction | 2013 |
| Nitrogruppa AS | Other services | 2012 |
| Njord Group Holding AS | Hospitality | 2022 |
| NLH Invest AS | Real estate | 2019 |
| Noah AS | Water & waste | 2020 |
| Noah Environment AS | Construction | 2020 |
| Noah Rekefjord AS | Water & waste | 2020 |
| Noah Solutions AS | Water & waste | 2002 |
| Nolt Bygg AS | Construction | 2025 |
| Noma Eiendom AS | Real estate | 2003 |
| Nordeagården AS | Real estate | 2011 |
| Nordic Bil 2 AS | Wholesale & retail | 2026 |
| Nordic Bil AS | Wholesale & retail | 2023 |
| Nordic Digital Media AS | Information & communication | 2023 |
| Nordic Moments AS | Arts & recreation | 2011 |
| Nordiq 360 AS | Wholesale & retail | 2015 |
| Nordisk Aviation Products AS | Manufacturing | 1988 |
| Nordisk Ventilasjon AS | Wholesale & retail | 2026 |
| Nordre Bakke Engineering AS | Professional & scientific | 2025 |
| Nordre Røed Gård AS | Administrative & support | 2022 |
| Nordre Vestfold Entreprenør AS | Construction | 2020 |
| Nordstjernen Consult AS | Administrative & support | 2012 |
| Noreheim Eiendom AS | Real estate | 1992 |
| Norse Food and Beverage Company AS | Wholesale & retail | 2024 |
| Norsk Betongsaging AS | Construction | 2025 |
| Norsk Biogassubstrat AS | Professional & scientific | 2003 |
| Norske Sikkerhetstjenester Ans | Wholesale & retail | 2000 |
| Nortelt AS | Administrative & support | 2020 |
| Nutestul Velforening | Other services | 2000 |
| Nwgr Holdings (Norway) AS | | 2017 |
| Nye Revulveien SA | Real estate | 2001 |
| Nymoen Invest AS | Real estate | 2005 |
| Nymåne AS | Professional & scientific | 2014 |
| Nyveien 4B AS | Real estate | 2013 |
| Odd Og Per Film AS | Information & communication | 2025 |
| Ola Løkebø AS | Health & social care | 2005 |
| Olafsen Prosjektadministrasjon AS | Professional & scientific | 2024 |
| Olivers Hjørne AS | Other services | 2024 |
| On Sport AS | Wholesale & retail | 2025 |
| Ophiolite AS | Real estate | 2014 |
| Opplæringskontoret Logistikk Og Transport Vestfold - Telemark - Buskerud SA | Education | 1996 |
| Oro Holding AS | Construction | 2005 |
| Oromar AS | Transport & logistics | 2007 |
| Oscar Og Ellie Invest AS | Real estate | 2019 |
| Outdoor Distribution AS | Wholesale & retail | 2023 |
| Oxira XR AS | Professional & scientific | 2021 |
| P.Kjøll Eiendom AS | Real estate | 2019 |
| Pak Solutions AS | Professional & scientific | 2025 |
| Papa Lås AS | Manufacturing | 2026 |
| Papi Eiendom AS | Real estate | 2019 |
| Paul Holding AS | Real estate | 2014 |
| Paul Reggestad AS | Real estate | 2006 |
| Paul Tekstil AS | Wholesale & retail | 2011 |
| Pbinvest AS | Real estate | 2018 |
| Peha Holding AS | | 2008 |
| Per Ellingsen AS | Administrative & support | 1986 |
| Pera Holding AS | Financial services | 2014 |
| Petter & Pia AS | Wholesale & retail | 2008 |
| Phronesis Holding AS | | 2026 |
| Piiotarho AS | | 2005 |
| Pimpernellen AS | Professional & scientific | 2023 |