| Jif Holding AS | Real estate | 2011 |
| Jimmo AS | Transport & logistics | 2020 |
| JJK AS | Information & communication | 2025 |
| Jksommerstad AS | Construction | 2023 |
| Jowi AS | | 2022 |
| JP Produkter AS | Construction | 2020 |
| Jpa Takst & Byggeledelse AS | Real estate | 2018 |
| JR Bruktbil AS | Wholesale & retail | 2026 |
| Jta Invest AS | Real estate | 2007 |
| Julian Investment AS | | 2026 |
| Juma AS | Administrative & support | 2020 |
| Juma Utvikling AS | Administrative & support | 2021 |
| Juma Verksted Og Lager AS | Real estate | 2021 |
| Jørn Persson AS | Financial services | 2005 |
| K Høstmark Holding AS | | 2025 |
| Ka&Ro AS | Health & social care | 2024 |
| Kanfer Shipping Management AS | Mining & quarrying | 2017 |
| Karlmar Holding AS | | 2025 |
| Karseth Eiendom AS | Real estate | 1997 |
| KBD AS | | 2025 |
| KDS Norway AS | Wholesale & retail | 2020 |
| Kennebec AS | | 2023 |
| Kim's Bygg Og Snekkerservice AS | Construction | 2016 |
| Kime Kapital AS | Financial services | 2017 |
| Kirkeveien 214 AS | Real estate | 2004 |
| Kirkeveien 222 AS | Real estate | 2009 |
| Kirkeveien 37 AS | Real estate | 2022 |
| Kirkeveien Frisør AS | Other services | 2020 |
| Kjølseth Holding AS | | 2021 |
| Klaar Holding AS | Wholesale & retail | 2025 |
| Klasseledelse AS | Education | 2019 |
| Klippoteket Teie AS | Other services | 2011 |
| Ko Dale Holding AS | | 2023 |
| Kolon Reklame AS | Professional & scientific | 2002 |
| KPW Holding AS | Real estate | 2005 |
| Kriaks Invest AS | | 2018 |
| Krogsgård Eiendom AS | Real estate | 2019 |
| Krogsgård Invest AS | Real estate | 2018 |
| Krus AS | Professional & scientific | 2007 |
| Kry Bad AS | Construction | 2022 |
| KS Borgheim Shipping | Transport & logistics | 1989 |
| Kslm Holding AS | | 2022 |
| Kuben Arkitektur AS | Professional & scientific | 2014 |
| Kupl AS | Professional & scientific | 2018 |
| Kurve Regnskap AS | Professional & scientific | 2023 |
| Kvitberg Eiendom AS | Real estate | 2024 |
| Kvitberg Holding AS | Real estate | 2023 |
| Kemppi Norge A/S | Wholesale & retail | 1980 |
| Laaknor IT AS | Information & communication | 2020 |
| Lasergravøren AS | Manufacturing | 2015 |
| Lawian AS | | 2023 |
| Layline AS | Education | 2024 |
| Lce AS | Real estate | 2017 |
| Lce Solution AS | Manufacturing | 2026 |
| Le Monde Frisør AS | Other services | 2013 |
| Learn Coaching AS | Education | 2019 |
| Leasio AS | Information & communication | 2025 |
| Lege Alf Christian Olsen AS | Health & social care | 2021 |
| Lege Cathrine Abrahamsen AS | Health & social care | 2019 |
| Lege Harald Miljeteig AS | Health & social care | 2006 |
| Legene Danholmen 3 AS | Real estate | 2008 |
| Leif Kølner Ingeniørfirma AS | Wholesale & retail | 1968 |
| Lerke Gård AS | Agriculture & fishing | 2009 |
| Lest AS | Professional & scientific | 2005 |
| Lettvet AS | Professional & scientific | 2025 |
| Levelup AS | Information & communication | 2017 |
| Lexico AS | Information & communication | 2026 |
| Lia Design AS | Manufacturing | 2016 |
| Lilleberg Bygg AS | Construction | 2024 |
| Lillesandhus Tønsberg Eiendom AS | Real estate | 2021 |
| Linge Holding AS | | 2022 |
| Lisaro Holding AS | Financial services | 2022 |
| Living & Dining AS | Wholesale & retail | 2013 |
| Loc Invest AS | | 2021 |
| Lokalavisen Øyene AS | Information & communication | 1999 |
| Lone Pine Invest AS | | 2022 |
| Luc AS | Arts & recreation | 2025 |
| Lumiere Systems AS | Wholesale & retail | 2025 |
| Lundheimveien Trade & Consulting Da | Wholesale & retail | 2014 |
| Lungehelse AS | Health & social care | 2008 |
| Luxz Sporthorses Da | Agriculture & fishing | 2017 |
| Lys Styring Data AS | Construction | 2000 |
| Løfqvist Holding AS | | 2020 |
| Lønna AS | Administrative & support | 2024 |
| M & M Kristiansen AS | Construction | 2003 |
| M&M Landbruk AS | Agriculture & fishing | 2022 |
| M2 Capital AS | | 2025 |
| Mady AS | | 2022 |
| Make More AS | Information & communication | 2017 |
| Makspuls Invest AS | | 2025 |
| Mam Eiendom AS | Real estate | 2005 |
| Maos Holding AS | | 2025 |
| Mare Nubium AS | Professional & scientific | 2012 |
| Marengo AS | Wholesale & retail | 2024 |
| Marine Ctrl AS | Wholesale & retail | 2020 |
| Marine Safety AS | Wholesale & retail | 2019 |
| Maritim Gruppen AS | Wholesale & retail | 2006 |
| Maritime - Shore Logistics Services AS | Transport & logistics | 2025 |
| Maritime Essentials AS | Wholesale & retail | 2025 |
| Martin Grøtterud AS | Wholesale & retail | 2022 |