| Nextbms AS | Information & communication | 2025 |
| Nexum Sikkerhet AS | Administrative & support | 2026 |
| NG & Bygg-Salg Invest AS | Construction | 2022 |
| NG Digital AS | Wholesale & retail | 1999 |
| NG Eiendom Vestfold Telemark AS | Real estate | 2002 |
| Nidelven Eiendom AS | Real estate | 2017 |
| Nielsen Bil & Båtpleie AS | Administrative & support | 2024 |
| Nils Holding AS | | 2005 |
| Niras Ans | Information & communication | 2000 |
| Nitas Nanset Installasjon AS | Construction | 1997 |
| Nli Overflate AS | Manufacturing | 2019 |
| No Dig Vestfold AS | Construction | 2018 |
| Noa Invest AS | Real estate | 2005 |
| Noka AS | Wholesale & retail | 2022 |
| Noor Invest Eiendom AS | Real estate | 2017 |
| Nor Autolakk AS | Wholesale & retail | 1998 |
| Nor Protect AS | Wholesale & retail | 2001 |
| Nor-Lux Enterprise AS | | 2019 |
| Nordauto AS | Wholesale & retail | 2024 |
| Nordby Grafisk AS | Manufacturing | 1999 |
| Nordbyen Legesenter Haugvik AS | Health & social care | 2006 |
| Nordbyen Legesenter Larvik AS | Real estate | 2024 |
| Nordex Global Trade AS | Wholesale & retail | 2026 |
| Nordic Icon AS | Wholesale & retail | 2018 |
| Nordic Klima AS | Construction | 2024 |
| Nordic Living Agency AS | Wholesale & retail | 2016 |
| Nordic Modules AS | Professional & scientific | 2013 |
| Nordic Private Equity AS | Real estate | 2011 |
| Nordic Seal AS | Manufacturing | 1993 |
| Nordic State AS | Professional & scientific | 2013 |
| Nordlyløkka AS | Real estate | 2020 |
| Nordsia Cargo AS | Transport & logistics | 2011 |
| Nordsia Invest AS | Transport & logistics | 2022 |
| Nordtak & Blikk AS | Construction | 2024 |
| Norgesgass Larvik AS | Wholesale & retail | 2012 |
| Norgesgruppen Vestfold Telemark AS | Real estate | 1995 |
| Norgesrenhold AS | Administrative & support | 2020 |
| Noricus 1 Holding AS | | 2023 |
| Norin Invest AS | Real estate | 2022 |
| Norleas AS | Wholesale & retail | 1981 |
| Normann AS | Education | 2023 |
| Normann Invest AS | Hospitality | 2013 |
| Norrek Dypfrys AS | Manufacturing | 1977 |
| Norrøna Invest AS | Financial services | 2008 |
| Norsk Avfallsmegling AS | Professional & scientific | 2009 |
| Norsk Byggservice AS | Professional & scientific | 1998 |
| Norsk Flisteknikk AS | Construction | 1995 |
| Norsk Wax AS | Wholesale & retail | 2000 |
| Norske Porter AS | Wholesale & retail | 1991 |
| North Sea Stone Industry AS | Mining & quarrying | 1996 |
| Norum Helse AS | Education | 2015 |
| Norum Holding AS | Education | 2014 |
| Norwegian Mussel Company AS | Energy | 2001 |
| Norwegian Toy Import AS | Wholesale & retail | 1999 |
| Nova - Invest AS | Real estate | 2005 |
| Novasolo AS | Wholesale & retail | 2015 |
| Novotek AS | Wholesale & retail | 1987 |
| Npe Eiendomsutvikling AS | Real estate | 2024 |
| NR1 Trykk Larvik AS | Manufacturing | 1998 |
| NXT Holding AS | | 2024 |
| Nybyen Dronningensgate 17-25 AS | Real estate | 2017 |
| Nybyen Dronningensgate 27-31 AS | Real estate | 2018 |
| Nybyen Eiendom AS | | 2015 |
| Nybyen Næringseiendom AS | Real estate | 2026 |
| Nye Bråten Tekstil AS | Manufacturing | 1993 |
| Nye Elveveien 23 AS | | 2026 |
| Nye Elveveien 23 Holding AS | | 2026 |
| Nye Klinikk Adine AS | Other services | 2007 |
| Nye Tider AS | Professional & scientific | 2022 |
| Nye Trebakken Eiendom AS | Real estate | 2016 |
| Nyhus AS | Real estate | 2022 |
| Nyquist Frisør AS | Other services | 2025 |
| Nysveen Og Conteh Da | Hospitality | 2004 |
| O Borgen AS | Wholesale & retail | 1949 |
| Ob-Offshore AS | Real estate | 2016 |
| Ocin Holding AS | | 2021 |
| Octopus Marine AS | Professional & scientific | 2017 |
| Odberg Holding AS | Real estate | 2019 |
| Odberg's Maskinservice AS | Manufacturing | 2017 |
| Odberggården Restaurantdrift AS | Hospitality | 2007 |
| Odd Farmen AS | Construction | 1979 |
| Odd Fellow Selskapslokaler AS | Real estate | 2020 |
| Odd Fellow Vinjes Vei 23 AS | Real estate | 2019 |
| Odd Stensvold AS | Construction | 2010 |
| Oddvar Andreassen AS | Real estate | 1975 |
| Odja Holding AS | Construction | 2017 |
| Offshore Solution Partner AS | Mining & quarrying | 2015 |
| Ohdearbaby AS | Wholesale & retail | 2020 |
| Okei Invest AS | Administrative & support | 2005 |
| Okp AS | Professional & scientific | 2024 |
| Olan Holding AS | Real estate | 2005 |
| Olav Stadheim AS | Health & social care | 1993 |
| Olavs Gate 5 AS | Real estate | 2025 |
| Olavsgate 7 AS | Real estate | 2012 |
| Olavsgate Eiendom AS | Real estate | 1995 |
| Olavsgt 2 AS | Real estate | 1995 |
| Olfactus AS | Wholesale & retail | 2012 |
| Olga Utvikling AS | Real estate | 2010 |
| Olipo Holding AS | | 2019 |
| Ollomani Invest AS | Real estate | 2018 |