| Klabautermann AS | Real estate | 2020 |
| Klafstad AS | | 2021 |
| Klepper Holding AS | | 2017 |
| Klev Seterskog Veilag | Real estate | 2013 |
| Klin Cocos AS | Professional & scientific | 2023 |
| Klinikkprodukter AS | Wholesale & retail | 2012 |
| Klokkertunet AS | Real estate | 2025 |
| KM Ship Management AS | Manufacturing | 2023 |
| Kmi Consulting AS | Professional & scientific | 2014 |
| KMT Eiendom AS | Real estate | 2005 |
| Knarrgo AS | Professional & scientific | 2026 |
| Knivstikkeren Eiendom AS | Real estate | 2020 |
| Knut H Holding AS | Financial services | 2005 |
| Knut Johansen Invest AS | | 2019 |
| Knut Teppan Design AS | Financial services | 2017 |
| Knutsen Consulting AS | Wholesale & retail | 2018 |
| Kolle Invest AS | | 2025 |
| Kombieiendom Skien AS | Real estate | 2017 |
| Komma Foods AS | Hospitality | 2023 |
| Kongsberg Defence Communication AS | Manufacturing | 2025 |
| Kongsberg Øyeklinikk AS | Health & social care | 2005 |
| Kontext AS | Professional & scientific | 1997 |
| Kontra Eiendom AS | Administrative & support | 1987 |
| Koya AS | Real estate | 2016 |
| Krater AS | Arts & recreation | 2024 |
| Krf-Holding AS | | 2026 |
| Kristian Sandbækken Holding AS | | 2023 |
| Kristoffer Finn Hansen Kiropraktikk AS | Health & social care | 2017 |
| Krogen AS | Financial services | 2005 |
| Krone Eiendom AS | Real estate | 2006 |
| Kronhjorten AS | Real estate | 2005 |
| Krossen Finans AS | | 2019 |
| Kruna Invest AS | Professional & scientific | 2023 |
| Kruna Technology AS | Professional & scientific | 2023 |
| Krunenes Invest AS | | 2022 |
| KSV Holding AS | | 2016 |
| KT Dokken Invest AS | | 2022 |
| KT Entreprenør AS | Construction | 2019 |
| Kuldex AS | Wholesale & retail | 2013 |
| Kundetekke AS | Professional & scientific | 2016 |
| Kvikk Consulting AS | Information & communication | 2023 |
| Kvist Håndverk AS | Construction | 2025 |
| KVL Holding AS | | 2023 |
| KVN Services Norge Ltd Nuf | Professional & scientific | 2011 |
| Kresny Holding AS | Financial services | 1983 |
| Kårner AS | Hospitality | 2026 |
| L Og S Holding AS | | 2024 |
| L3E Invest AS | | 2024 |
| Lacom AS | Professional & scientific | 2014 |
| Laibel AS | | 2023 |
| Laid Back AS | Wholesale & retail | 2016 |
| Lailis AS | Professional & scientific | 2024 |
| Lama Capital AS | | 2022 |
| Lamaco AS | Information & communication | 2013 |
| Lambach Marine AS | | 2024 |
| Lamolsen AS | Professional & scientific | 2023 |
| Lancelot AS | Hospitality | 1997 |
| Landskauveien Eiendom AS | Real estate | 2013 |
| Langestrand Va AS | Water & waste | 2021 |
| Langgård Asker AS | Real estate | 2015 |
| Lars Erik Wien Holding AS | | 2023 |
| Lars H Holding AS | Real estate | 2015 |
| Larssons Sparegris AS | | 2020 |
| Lasa Invest AS | Professional & scientific | 2021 |
| Last Mile AS | Information & communication | 2014 |
| Last Mile Holding AS | Information & communication | 1999 |
| Last Mile Solutions AS | Information & communication | 2006 |
| Lastmo AS | Professional & scientific | 2018 |
| Latinavian AS | Hospitality | 2025 |
| Laupsa AS | Construction | 2019 |
| Laxey AS | Financial services | 2014 |
| LC Eiendom II AS | Real estate | 2012 |
| LCV Holding AS | | 2025 |
| LCW Invest AS | Professional & scientific | 2005 |
| Lean Building Systems AS | Manufacturing | 2015 |
| Leangen AS | Real estate | 1990 |
| Leap Lab AS | Education | 2014 |
| Learnix AS | Information & communication | 2021 |
| Lebull Products AS | Professional & scientific | 2023 |
| Lege AS | Health & social care | 2012 |
| Leiren AS | Real estate | 2022 |
| Lemis AS | Real estate | 2007 |
| Lemy AS | | 2025 |
| Lexit Da | Real estate | 2000 |
| LFC Louisiana Fried Chicken Da | Manufacturing | 2003 |
| Lfhundetrening AS | Other services | 2025 |
| LH Collection AS | Information & communication | 2022 |
| Librolink AS | Information & communication | 2025 |
| Lidium AS | Real estate | 2025 |
| Lien Consulting Prosjekt AS | Professional & scientific | 2020 |
| Lien Eiendomsservice AS | Real estate | 2020 |
| Lien Holding Prosjekt AS | Real estate | 2020 |
| Lien Prosjekt Consulting AS | Professional & scientific | 2018 |
| Ligence 2 AS | | 2024 |
| Ligence AS | Information & communication | 2016 |
| Lille Haugeto Ans | Agriculture & fishing | 2020 |
| Lille Haveli AS | Hospitality | 2021 |
| Lille Årosvei 46 AS | Wholesale & retail | 2017 |
| Lillebardun AS | Wholesale & retail | 2025 |
| Lillenga AS | Construction | 2021 |