| Jan Edvardsen AS | Construction | 1986 |
| Jan Edvardsen Eiendomsselskap AS | Real estate | 1986 |
| Janusz Serafin Bud-Pol | Construction | 2007 |
| Jas Eiendom AS | Real estate | 2005 |
| Javi Musik AB Nuf | Wholesale & retail | 2004 |
| Jelsnes AS | Real estate | 2017 |
| Jkhm Invest AS | | 2022 |
| Jtø Eiendom Da | Real estate | 2021 |
| Julie Grimsrud AS | Arts & recreation | 2018 |
| K5 Klinikken AS | Health & social care | 2014 |
| K5-KANTINE AS | Hospitality | 2012 |
| Kalnes Eiendom AS | Real estate | 2003 |
| Kalnes Samfunnsbygg AS | Real estate | 2020 |
| Kalnesbrekka 2 AS | Real estate | 2021 |
| Kalnesbrekka 4 AS | Real estate | 2017 |
| Kalnesparken AS | Real estate | 2010 |
| Kappla Stillas AS | Construction | 2012 |
| Karoline Myrvang AS | | 2025 |
| Katrei AS | | 2025 |
| KCC AS | | 2005 |
| Kent Johannessen AS | Construction | 2003 |
| Kent Johannessen Utleie AS | Construction | 2017 |
| Keramikkhuset AS | Arts & recreation | 2025 |
| Ki Våler AS | Professional & scientific | 2020 |
| Kjell Mørk AS | Real estate | 1981 |
| Kjøttbazaren AS | Wholesale & retail | 1999 |
| Klima Øst AS | Construction | 2007 |
| Kobber- Og Blikkenslagerverksted Torbjørn Lemtun AS | Construction | 2020 |
| Komfortshop AS | Wholesale & retail | 2014 |
| Kongsgaard Hytteutleie AS | Real estate | 2021 |
| Krossveien 3 AS | Real estate | 2020 |
| Kursiv Eiendomsmegling AS | Real estate | 2014 |
| Kvalheim Kraft Da | Energy | 2009 |
| L. Nyegaard Eiendom AS | Real estate | 2018 |
| Lar Holding AS | Real estate | 2014 |
| Lar Strykerveien 6 AS | Real estate | 1983 |
| Lars Winsvold Holding AS | Professional & scientific | 2014 |
| Lawo AS | Construction | 2024 |
| Lba Cap AS | Real estate | 1983 |
| Lech Andrzejak Lech | Construction | 2007 |
| Lege Jan R B Hansen AS | Health & social care | 2019 |
| Legionor AS | | 2026 |
| Leisterud Holding AS | Professional & scientific | 2021 |
| Lemon Cube AS | Real estate | 2019 |
| Lensen Toppoint | Professional & scientific | 2005 |
| Leonberg Reklamebyrå AS | Professional & scientific | 1991 |
| Leren Holding AS | | 2025 |
| Lifezum AS | Professional & scientific | 2025 |
| Lila Eiendom AS | Real estate | 2012 |
| Lille Krusedull AS | Wholesale & retail | 2018 |
| Linjal AS | | 2022 |
| Liv Og Lykke Legesenter AS | Health & social care | 2021 |
| LM Konsulenttjenester AS | Professional & scientific | 2015 |
| Loh Holding AS | Construction | 2005 |
| Ludvig Kamperhaug AS | Construction | 1980 |
| Luva Prosjekt AS | Professional & scientific | 2015 |
| Ly Årmann AS | Real estate | 2021 |
| Lyn Eiendom AS | Real estate | 2012 |
| Lyn Elektro AS | Construction | 2011 |
| Lyn Elektropartner AS | Wholesale & retail | 2013 |
| Lyn Gruppen AS | Real estate | 2022 |
| Lyn Holding AS | Construction | 2011 |
| Lynglund Holding AS | | 2025 |
| Ma-Ni AS | | 2023 |
| Madrub Holding AS | Real estate | 2022 |
| Magnestad Holding AS | Professional & scientific | 2021 |
| Malawa AS | Professional & scientific | 2026 |
| Malerfirma Hermansson AS | Construction | 2020 |
| Malermester-Ronny Gulbrandsen AS | Construction | 2016 |
| Marek Modzelewcki | Construction | 2007 |
| Marian Kowalski Marys | Construction | 2007 |
| Markus Aasen Bygg AS | Construction | 2026 |
| Martinsvingen Invest AS | | 2020 |
| Megger AS | Wholesale & retail | 1982 |
| MEKLER1 AS | Professional & scientific | 2014 |
| Merinfo SA | Information & communication | 2018 |
| Mero Eiendom AS | Real estate | 2001 |
| Mero Holding AS | Wholesale & retail | 2005 |
| Michal Olitkowski | Construction | 2007 |
| Millette Holding AS | Financial services | 2005 |
| Minkopi.No AS | Manufacturing | 2002 |
| MJ Maskin AS | Construction | 2018 |
| MK Båt AS | Manufacturing | 2012 |
| MM Prosjekt AS | Construction | 2015 |
| Monday AS | Construction | 2021 |
| Mondi Moss AS | Wholesale & retail | 1996 |
| Mopi Holding AS | | 2024 |
| Moseveien 16 AS | | 2005 |
| Mountainfarm AS | Information & communication | 2022 |
| Mountainfarm Holding AS | Information & communication | 2024 |
| MRG Eiendom AS | Construction | 2013 |
| MRG Holding AS | Construction | 2014 |
| Myosin AS | Information & communication | 2022 |
| Nedre Glomma Invest AS | Construction | 2022 |
| Nelles AS | | 2019 |
| Neo AS | Information & communication | 2018 |
| Neo Holding AS | Information & communication | 2018 |
| Nestenthon AS | Real estate | 2010 |
| NGK Utbygging AS | Energy | 2014 |
| NGT 36 AS | Real estate | 2024 |