| JPT Agency AS | Wholesale & retail | 2019 |
| Jømo Eiendom AS | Real estate | 1980 |
| Jørgenrud Bil & Deler AS | Wholesale & retail | 2007 |
| Jørgenrud Brensel AS | Wholesale & retail | 1985 |
| Jørgenrud Eiendom AS | Real estate | 2015 |
| K. M. Sørby AS | Real estate | 2006 |
| K. Ruud Holding AS | Real estate | 2005 |
| K. Warud Holding AS | Real estate | 2022 |
| Kalendervenn AS | Information & communication | 2025 |
| Kama Management Ans | Real estate | 2001 |
| Kari-Mette Stang-Hansen AS | Health & social care | 2022 |
| Karistuveien AS | Real estate | 2021 |
| Karmøy Naturstein Sjø AS | Real estate | 2003 |
| Kenneth Dahl Horne AS | Professional & scientific | 2013 |
| Keytv AS | Information & communication | 2012 |
| Kiampn Consulting AS | Information & communication | 2023 |
| Kirkeng Butikkdrift AS | Wholesale & retail | 2021 |
| Kirkengen Hagebygd AS | Real estate | 2000 |
| Kjell Erik Åsvestad AS | Construction | 2017 |
| KK Team AS | Construction | 2015 |
| Klever Rør Og Eiendom AS | Real estate | 2026 |
| Kløverbakken Bygg AS | Real estate | 2017 |
| Kløverbakken Samdrift Da | Agriculture & fishing | 2007 |
| Knapstadveien 10 AS | Real estate | 2005 |
| Krispi Design AS | Construction | 2018 |
| Kroppen AS | Real estate | 2013 |
| Kvisler Eiendom AS | Real estate | 2015 |
| Kvisler Sprinkler AS | Construction | 2013 |
| Lack Bar AS | Hospitality | 2023 |
| Lafem Frisør AS | Other services | 2017 |
| Landskapsforvaltning AS | Professional & scientific | 2019 |
| Langlis Vei Eiendom Ans | Real estate | 1996 |
| Lars Og Heidi AS | | 2023 |
| Leins Telecom AS | Wholesale & retail | 1998 |
| Leirskallen Panorama AS | Real estate | 2018 |
| Lets Go Simple AS | Professional & scientific | 2022 |
| Level-Headed AS | Real estate | 2016 |
| Liberg Entreprenad | Construction | 2004 |
| Linas Gedutis | Construction | 2004 |
| Lindmo AS | Information & communication | 2007 |
| Lokalt Minilager AS | Real estate | 2025 |
| Loom Apparel AS | Wholesale & retail | 2026 |
| Lyngholm Eiendom AS | Real estate | 2025 |
| Lyngholm Holding AS | Construction | 2017 |
| Lynx Eiendomsforvaltning AS | Real estate | 2024 |
| Lyseren - Hov Vannforsyning SA | Water & waste | 1961 |
| Lyseren Vanningslag A/L | Agriculture & fishing | 1995 |
| M.Rædergård Holding AS | | 2024 |
| Ma Rørservice AS | Construction | 2016 |
| Mae Eiendom AS | Real estate | 2024 |
| Marius Solberg AS | Information & communication | 2025 |
| Martiniussens Bilservice AS | Transport & logistics | 2002 |
| Martiniussens Eiendom AS | Transport & logistics | 2017 |
| Mata Eiendom AS | Wholesale & retail | 2005 |
| Mata Utvikling AS | Real estate | 2013 |
| MC Deler AS | Wholesale & retail | 2013 |
| Medgar Invest AS | | 2021 |
| Megatec Automation AS | Wholesale & retail | 2014 |
| Meko Husbygge AS | Construction | 2022 |
| Mektoppen Eiendom AS | Real estate | 2013 |
| Melodent Askim AS | Health & social care | 2022 |
| Melodent Spydeberg AS | Health & social care | 2021 |
| Mem Holding AS | Education | 2022 |
| Metcon AS | Wholesale & retail | 1993 |
| Mibra Invest AS | Construction | 2016 |
| Mikromeyer Bryggerhus AS | Manufacturing | 2014 |
| Miljø I Fokus AS | Wholesale & retail | 1998 |
| Mo-Knatten Eiendom AS | Real estate | 2008 |
| Moelven Are AS | Manufacturing | 1986 |
| Moen Eiendom AS | Real estate | 1998 |
| Moen Eiendomsutvikling AS | Real estate | 2022 |
| Moen Takst AS | Real estate | 2018 |
| Molica AS | Professional & scientific | 2021 |
| Molina AS | Agriculture & fishing | 2016 |
| Moss & Våler Bygg AS | Real estate | 2022 |
| Moss Og Våler Næringspark AS | Real estate | 2009 |
| Mudpie AS | Hospitality | 2025 |
| Murkelie AS | Real estate | 2021 |
| Murmester Svend/Flemming Kristiansen AS | Construction | 2022 |
| Myrerskog Lunsj & Catering AS | Hospitality | 2005 |
| Måleng Eiendom AS | Real estate | 2004 |
| Møllerstua Service AS | Wholesale & retail | 2014 |
| Mølskroken Strand Og Bryggeforvaltning AS | Real estate | 2019 |
| Mørk Gruppen AS | Wholesale & retail | 2021 |
| Nerdrum Elektronikk AS | Manufacturing | 1981 |
| Netlandet AS | Other services | 2020 |
| Nio AS | Professional & scientific | 2024 |
| No Class AS | Arts & recreation | 2022 |
| Nofo AS | Financial services | 1993 |
| Nor Eiendomstjenester AS | Construction | 2025 |
| Nordby Gård AS | Real estate | 2002 |
| Nordic Heads Limited Nuf | Professional & scientific | 2006 |
| Nordre Follo Bil AS | Transport & logistics | 2020 |
| Norsk Kompetanseutvikling AS | Education | 1998 |
| NORSK KUNSTFORMIDLING Brynildsen Sundsbø DA Galleri 86. | Administrative & support | 1986 |
| Norsk Sceneteknikk AS | Wholesale & retail | 1981 |
| North Security AS | Administrative & support | 2005 |
| Ntek Takst AS | Real estate | 2024 |
| Ny Begynnelse Bygg AS | Construction | 2025 |
| Nyco Holding AS | Professional & scientific | 2005 |