| Investco Accounting AS | Professional & scientific | 2024 |
| Investimenti AS | Financial services | 2018 |
| Investorcrew AS | Professional & scientific | 2024 |
| Ipp International Pipeline Products AS | Wholesale & retail | 1997 |
| Iris & Neve Invest AS | Real estate | 2003 |
| IT Hybrids AS | | 2019 |
| Janne Ugelstad Holding AS | Financial services | 2014 |
| Jebbe Invest AS | | 2026 |
| Jensebu Holding AS | Real estate | 2009 |
| JH Bonde AS | | 2025 |
| John-Erik Karlsen Invest AS | Financial services | 2017 |
| JRM Sve Holding AS | Real estate | 2014 |
| Jumjum AS | | 2024 |
| Juno AS | Arts & recreation | 2012 |
| Jan Bauck Arkitektkontor A/S | Professional & scientific | 1985 |
| K-3 Solutions AS | Professional & scientific | 2022 |
| K. Henriksen Invest AS | | 2023 |
| Kaensche AS | Real estate | 2017 |
| Kaldera AS | Professional & scientific | 1992 |
| Kalvehagen Vann Og Avløp SA | Water & waste | 2016 |
| Karlsen Invest LLC Nuf | Construction | 2022 |
| Keckho Rådgivning AS | Professional & scientific | 2022 |
| Kikamo AS | Financial services | 2006 |
| Kinnarps AS | Wholesale & retail | 2001 |
| Kirederf AS | | 2026 |
| Kirsten & Bjørn Olav Holding AS | | 2021 |
| Kite Invest AS | Real estate | 2005 |
| Klever Dreams AS | Professional & scientific | 2019 |
| Klungland AS | | 2020 |
| Kobbå AS | Financial services | 2010 |
| Kollegium Holding AS | Professional & scientific | 2005 |
| Konayuki AS | | 2022 |
| Kone Og Mann AS | Professional & scientific | 2024 |
| Konkurs AS | Arts & recreation | 2024 |
| Kroppibalanse AS | Other services | 2005 |
| Kvia Capital AS | | 2024 |
| Kvien AS | Professional & scientific | 2005 |
| Kvien Helsekost AS | Wholesale & retail | 2018 |
| KW Eiendom AS | Real estate | 2023 |
| KW Eiendom I AS | Real estate | 2024 |
| KW Eiendom II AS | Real estate | 2024 |
| Labhuset AS | Wholesale & retail | 2022 |
| Langeland Mølle AS | Financial services | 1990 |
| Large AS | Information & communication | 2020 |
| Ledercoaching AS | Professional & scientific | 2023 |
| LG Consulting AS | Professional & scientific | 2019 |
| Lie Hansen Mat AS | Wholesale & retail | 2024 |
| Lijordet Huseierforetak SA | Other services | 1981 |
| Lilja Familiebarnehage Da | Education | 2008 |
| Lille My Familiebarnehage Vollsveien AS | Education | 2024 |
| Lilloe-Olsen Capital AS | | 2024 |
| LNS Kommunikasjonsrådgivning AS | Professional & scientific | 2024 |
| Lodewyckx Consulting AS | Professional & scientific | 2023 |
| Lufin AS | | 2008 |
| Lundstadsveen Holding AS | | 2025 |
| Lydhør AS | Professional & scientific | 1992 |
| Løvenskioldbanen Skytesenter AS | Arts & recreation | 1987 |
| M Platou AS | | 2020 |
| M. Nilsson Bygg AS | Construction | 2012 |
| Ma Invest AS | Financial services | 2013 |
| Mag-S Regnskap AS | Professional & scientific | 2007 |
| Majainco AS | Real estate | 2020 |
| Manzana AS | Professional & scientific | 1995 |
| Manzana Invest AS | | 2021 |
| Map Måling Analyse Presentasjon AS | Professional & scientific | 1994 |
| Marback Interiør AS | Professional & scientific | 2015 |
| Marie Invest AS | Financial services | 1995 |
| Maspell AS | Information & communication | 2026 |
| Mat Og Sånn AS | Information & communication | 2016 |
| Matfolk AS | Professional & scientific | 2026 |
| Maymedia AS | Professional & scientific | 2020 |
| Mediaone AS | Information & communication | 2011 |
| Mere Mat AS | Wholesale & retail | 2024 |
| Mere Mat Holding AS | | 2024 |
| Mianda AS | | 2023 |
| Minde Allè 10 AS | Real estate | 2020 |
| Miro Circle AS | Financial services | 2018 |
| Mirobo AS | Financial services | 2018 |
| Mitt Dekkhotell Røa AS | Wholesale & retail | 2007 |
| Mjaaland Holding AS | | 2022 |
| MK Holdings AS | | 2025 |
| Mny Holding AS | Real estate | 2019 |
| Monken AS | | 2021 |
| Mortec AS | Information & communication | 2019 |
| Morten Thorkildsen Consulting AS | Information & communication | 2019 |
| Mostad Invest AS | Professional & scientific | 2016 |
| MS Råd AS | Professional & scientific | 2011 |
| Munn- Og Fotmalende Kunstneres Forlag AS | Wholesale & retail | 1962 |
| Myngvis Invest AS | | 2021 |
| Møbeltapetserer Marsta AS | Other services | 2023 |
| N-Ø Holding AS | Wholesale & retail | 2005 |
| N-Ø Therapeutics AS | Wholesale & retail | 1973 |
| Natier AS | Real estate | 2015 |
| Navarhaugen AS | | 2021 |
| Neve Holding AS | Real estate | 2003 |
| Neve Invest AS | Real estate | 1999 |
| Nextup AS | Arts & recreation | 2026 |
| Nico AS | Administrative & support | 2004 |
| Nito Praktisk Hjelp Da | Health & social care | 2003 |
| Nobel Medispa AS | Other services | 2020 |