| Kylland Holding AS | Arts & recreation | 2021 |
| Kyllenstjerna Holding AS | Professional & scientific | 2025 |
| Kymaa AS | Wholesale & retail | 2024 |
| Kynd AS | Information & communication | 2024 |
| Kyndell AS | | 2022 |
| Kyndill AS | Professional & scientific | 2009 |
| Kyndryl Norway AS | Information & communication | 2021 |
| Kyndryl Services AS | Information & communication | 2015 |
| Kynningsrud & Løchen Invest Ans | | 1999 |
| Kyocera Document Solutions Norge Nuf | Wholesale & retail | 2001 |
| Kyocera Fastening Solutions Norway AS. | Wholesale & retail | 2021 |
| Kyocera Unimerco Tooling AS | Wholesale & retail | 1995 |
| Kyodai AS | Real estate | 2005 |
| Kyosei AS | | 2021 |
| Kyoto Group AS | Wholesale & retail | 2016 |
| Kyrakampen Holding AS | | 2025 |
| Kyrkjevegen 1 Geilo AS | Real estate | 2020 |
| Kyrre Garseth Invest AS | Real estate | 2022 |
| Kyrre Greppsgt 19 Eiendom Ans | Real estate | 2001 |
| Kyrre Haugen Sydness AS | Arts & recreation | 2018 |
| Kyrvatn Eiendom AS | Real estate | 2024 |
| Kystbo AS | Real estate | 2001 |
| Kystglede AS | Wholesale & retail | 2026 |
| Kyststien AS | Financial services | 2005 |
| Kyung Jae Holding AS | | 2020 |
| KZ Byggservice AS | Construction | 2023 |
| Kzemos Norway AS | Arts & recreation | 2026 |
| Kzjp AS | Construction | 2026 |
| KZT AS | Transport & logistics | 2025 |
| Kampen Eiendom A/S | Real estate | 1969 |
| Karcher a.s | Wholesale & retail | 1980 |
| Keddell & Bommen A/S | Wholesale & retail | 1986 |
| Kommunal Rapport A/S | Information & communication | 1987 |
| Kommuneforlaget AS | Information & communication | 1976 |
| Kristian Augustsgate 15 AS | Real estate | 1935 |
| Kährs Norge AS | Wholesale & retail | 1986 |
| Källgården Holding AS | | 2026 |
| Kå Oppussing AS | Construction | 2026 |
| Kåre Bjørlo AS | Professional & scientific | 2022 |
| Kåre Hagen & Co AS | Construction | 2021 |
| Kåre Torrissen AS | Real estate | 2005 |
| Kårhuset AS | Hospitality | 2025 |
| Kåring Ledelse AS | Professional & scientific | 2006 |
| Köd Bergen AS | Hospitality | 2022 |
| Köd Frogner AS | Hospitality | 2021 |
| Köd Oslo AS | Hospitality | 2018 |
| Kör AS | Professional & scientific | 2019 |
| Kör Teknologi AS | Information & communication | 2020 |
| Kör Trafikkskoler AS | Education | 2020 |
| Kösk Bjørvika AS | Wholesale & retail | 2020 |
| Kø Consulting AS | Professional & scientific | 2022 |
| Kø Invest AS | Real estate | 2010 |
| Kø Konsulentene AS | Information & communication | 2024 |
| København Kontorbygg II AS | Real estate | 2018 |
| København Kontorbygg III AS | | 2024 |
| Københavner Kafeen AS | Hospitality | 2000 |
| Københavngata 10 AS | Real estate | 2010 |
| Københavngaten 14 AS | Real estate | 1995 |
| Københavngt 4 Abc AS | Households | 1930 |
| Køge Eiendomsinvest AS | | 2017 |
| Køhn Helse AS | Health & social care | 2021 |
| Kølatoppen 25 AS | Real estate | 2020 |
| Køltur AS | Manufacturing | 2024 |
| Køltz Holding AS | | 2023 |
| Køltzow Holding AS | | 2021 |
| Kørja Kapital AS | | 2022 |
| Køye Consulting AS | Professional & scientific | 2018 |
| L & a Malerfirma Ans | Construction | 1988 |
| L 2 Holding AS | Real estate | 1987 |
| L B M Norge AS | Construction | 2013 |
| L Capital AS | | 2020 |
| L Dyrendal AS | | 2024 |
| L E Holding AS | Information & communication | 2018 |
| L E Tengs AS | Professional & scientific | 1996 |
| L Easy AS Norsk Avdeling Av Utenlandsk Foretak Nuf | Wholesale & retail | 2001 |
| L Holding AS | | 2025 |
| L Plus S AS | Arts & recreation | 2016 |
| L Services AS | Wholesale & retail | 2024 |
| L Skaug Holding AS | Arts & recreation | 2021 |
| L T Lian AS | Professional & scientific | 1990 |
| L Trading AS | | 2026 |
| L&B Container IV AS | | 2023 |
| L&B Management AS | Hospitality | 2026 |
| L&E Invest AS | Real estate | 2021 |
| L&G Invest AS | | 2022 |
| L&L Guiding Ans | Education | 2024 |
| L&L North AS | | 2023 |
| L&T Engineering AS | Real estate | 2023 |
| L&V Negler AS | Other services | 2021 |
| L'Appartement AS | Professional & scientific | 2022 |
| L'Ardoise AS | Hospitality | 2015 |
| L'Aristochat AS | Wholesale & retail | 2020 |
| L'Espace AS | Wholesale & retail | 2024 |
| L'Oreal Norge AS | Wholesale & retail | 1989 |
| L'Piano Eriksen-Voll Da | Wholesale & retail | 2003 |
| L+B Studio AS | Wholesale & retail | 2018 |
| L-Ektro AS | Construction | 2024 |
| L-Estor AS | Professional & scientific | 2024 |
| L-Shop-Team Norge AS | Wholesale & retail | 2018 |
| L. a. Eidsheim AS | Information & communication | 2016 |