| Malerfirma Engvold & Sønn AS | Construction | 2001 |
| Mandag AS | | 2017 |
| Marianne Vonstett AS | Financial services | 2005 |
| Marine Norseman AS | Professional & scientific | 2018 |
| Maskinkontroll Holding AS | Real estate | 2020 |
| Mathuset Sjøbua AS | Wholesale & retail | 1997 |
| Max Gill Holding AS | Financial services | 2017 |
| MB Rørindustri AS | Construction | 2022 |
| Meen AS | Professional & scientific | 2010 |
| Meen Eiendom AS | Real estate | 2018 |
| Melfald Holding AS | Real estate | 2017 |
| MFN Sporthorses AS | Wholesale & retail | 2025 |
| MG Media AS | Information & communication | 2024 |
| Mi Holding AS | Wholesale & retail | 2005 |
| Mij AS | Other services | 2026 |
| Miljøberedskap AS | Education | 2022 |
| Miljøopplag AS | Transport & logistics | 2013 |
| Minneform AS | Professional & scientific | 2026 |
| Mjælvika Båthavn SA | Arts & recreation | 2020 |
| Mkas Bygg AS | Construction | 2023 |
| Modalen Skog & Håndverk AS | Construction | 2023 |
| Modulor AS | Professional & scientific | 2025 |
| Moose Holding AS | | 2020 |
| Morgan Instrument Norge AS | Wholesale & retail | 1993 |
| Morten Busk Holding AS | | 2010 |
| Mostein Fiskeri AS | Agriculture & fishing | 2019 |
| Movegen 125 AS | Real estate | 2021 |
| Msek AS | | 2024 |
| Myrane Holding AS | Real estate | 2021 |
| Myrland Auto AS | Wholesale & retail | 2023 |
| Myrland Invest AS | Wholesale & retail | 2023 |
| Myssa AS | Real estate | 2019 |
| Måjohamat AS | Wholesale & retail | 2022 |
| Nadbygg AS | Construction | 2025 |
| NB & Partnere AS | Financial services | 2019 |
| NBK Verksted AS | Other services | 2020 |
| Neby Skog Ans | Agriculture & fishing | 2007 |
| Nemi Eiendom AS | Real estate | 2018 |
| Netopp Eiendom AS | Professional & scientific | 2011 |
| Nia Holding AS | Real estate | 2013 |
| Nils-Johan Tufte Holding AS | Manufacturing | 2020 |
| Nopava Senteret | Other services | 1984 |
| Nordic Vision Invest AS | | 2026 |
| Norgeslektern AS | Real estate | 2026 |
| Norsilva AS | Wholesale & retail | 1975 |
| Norsk Bilkontroll AS | Professional & scientific | 1997 |
| Norsk Industriportal Ans | Administrative & support | 2000 |
| Norsk Maskinkontroll AS | Professional & scientific | 2001 |
| Norsk Modul AS | Manufacturing | 2017 |
| Norsk Pukkservice AS | Mining & quarrying | 2008 |
| Northsea Sailing AS | Wholesale & retail | 2026 |
| Norvia AS | Wholesale & retail | 2025 |
| Notodden Solenergi AS | | 2023 |
| Novi Dynamittveien AS | | 2026 |
| Novi Kongholm AS | | 2026 |
| Novi Pancom AS | | 2024 |
| Novi Portfolio AS | | 2025 |
| Novi Property AS | | 2025 |
| Novi Viken AS | | 2025 |
| NR1UTLEIE AS | Administrative & support | 2015 |
| Nta Holding AS | Construction | 2024 |
| NTT Utvikling AS | Real estate | 2025 |
| Nybrottveien Va SA | Water & waste | 2016 |
| Nye Reco AS | Manufacturing | 2024 |
| Nylende Næringsbygg AS | Real estate | 2020 |
| Nytt Rør AS | Construction | 2008 |
| Nytt-Kjøkken AS | Wholesale & retail | 2002 |
| Oc Eiendom AS | Real estate | 2008 |
| Oc Holding AS | Real estate | 2007 |
| Oda Sofies Isbar AS | Hospitality | 2013 |
| Ola Senteret AS | Health & social care | 2006 |
| Olada Invest AS | Real estate | 2022 |
| Olai Brønsten Invest AS | | 2022 |
| Oldroyd AS | Manufacturing | 1994 |
| Oldroyd Eiendom AS | Real estate | 2018 |
| Oldroyd Holding AS | Manufacturing | 2023 |
| Oldroyd Innovation AS | Professional & scientific | 1991 |
| Oldroyd Production AS | | 2025 |
| Oldroyd Retail Holding AS | Wholesale & retail | 2020 |
| Olmi Invest AS | | 2022 |
| Omana Invest AS | Real estate | 2015 |
| Omk Eiendom AS | Real estate | 1978 |
| Operma AS | Professional & scientific | 1991 |
| Opticonsult AS | Professional & scientific | 2022 |
| Optima Bad AS | Wholesale & retail | 2007 |
| Osw Invest AS | | 2021 |
| P.S Takst Og Byggrådgivning AS | Real estate | 2024 |
| Paaholding AS | | 2023 |
| PAD38 AS | Construction | 2014 |
| Panoramaeiendom AS | Real estate | 2019 |
| Panoramaholding AS | Wholesale & retail | 2018 |
| Paps AS | Professional & scientific | 2020 |
| Patsogo AS | Hospitality | 2026 |
| Paunan AS | Professional & scientific | 2025 |
| Pedellen 15-23 AS | Real estate | 2020 |
| Pedersen Bygg & Eiendomsdrift AS | Real estate | 2016 |
| Pegasus AS | Professional & scientific | 2017 |
| Pelvital AS | Manufacturing | 2012 |
| Per Arne Helland Holding AS | | 2020 |
| Per Henrik Sitt AS | Professional & scientific | 2005 |