| Kaska AS | Other services | 2018 |
| Kaspar Strømme AS | Construction | 1976 |
| KASPARAS2ROM AS | Professional & scientific | 2024 |
| Kaspersen Service AS | Construction | 2022 |
| Kata AS | Professional & scientific | 2008 |
| Katarina Veterinærhus AS | Professional & scientific | 2017 |
| Kavholmen Invest AS | Construction | 2021 |
| Kavig AS | | 2023 |
| Kay Røsstad Holding AS | Financial services | 2005 |
| KBL Konsult AS | Administrative & support | 2023 |
| KBM Eiendom AS | Real estate | 2017 |
| KBM Invest AS | | 2009 |
| KBR Eiendom AS | Real estate | 2016 |
| KCG AS | Manufacturing | 2023 |
| KDG AS | Professional & scientific | 2025 |
| Ke-Jo AS | | 2019 |
| Keas Bygg & Vedlikehold AS | Construction | 2008 |
| Kebab House Kristiansand AS | Hospitality | 2014 |
| Kebab House Sørlandsparken AS | Hospitality | 2020 |
| Kefo AS | Other services | 1986 |
| Keha AS | Real estate | 2020 |
| Kemtek AS | Wholesale & retail | 1995 |
| Kemtek Eiendom AS | Real estate | 2012 |
| Kenneth Barnetøy AS | Wholesale & retail | 1996 |
| Kenneth Invest AS | Financial services | 2016 |
| Kenza AS | Wholesale & retail | 1985 |
| Keol Holding AS | Real estate | 2005 |
| Kerms Solution AS | Professional & scientific | 2025 |
| Kersten Innovation AS | | 2022 |
| Ket AS | Real estate | 2005 |
| Ketil Moes Plass AS | Real estate | 2022 |
| Key Solution AS | Professional & scientific | 2014 |
| Keystone Hylleselskap 2 AS | Information & communication | 2018 |
| KFK Invest AS | | 2021 |
| Kfregnskap AS | Professional & scientific | 2024 |
| KFV 43 AS | Real estate | 2023 |
| KGH Eiendom AS | Hospitality | 2020 |
| Khha Invest AS | | 2021 |
| Khha Invest II AS | Professional & scientific | 2022 |
| Khive Capital AS | | 2026 |
| KHL Invest AS | | 2024 |
| KHR Holding AS | | 2025 |
| Kick Kulturhus & Scene AS | Hospitality | 2024 |
| Kick Lyd Og Lys AS | Hospitality | 2025 |
| Kiddio Da | Wholesale & retail | 2010 |
| Kihls Transport AS | Transport & logistics | 2015 |
| Kikora AS | Information & communication | 2017 |
| Kildedal Holding AS | | 2025 |
| Kilnes Holding AS | | 2025 |
| Kimmis AS | Manufacturing | 2023 |
| Kimmis Candy AS | Manufacturing | 2023 |
| Kinetic 7 Technologies Norway AS | Wholesale & retail | 2020 |
| KINETIC7 Technologies Innovation Center AS | Professional & scientific | 2024 |
| King Cuts AS | Other services | 2023 |
| King Kiropraktor AS | Health & social care | 2014 |
| King of Kings AS | | 2023 |
| Kinlihn Invest AS | Financial services | 2007 |
| Kinn AS | Real estate | 2008 |
| Kinn Invest AS | | 2006 |
| Kinnan Norge AS | Wholesale & retail | 2014 |
| Kinosør AS | Information & communication | 2005 |
| Kirkegata 10 Eiendom AS | Real estate | 2011 |
| Kirkegata 23A AS | Real estate | 2025 |
| Kirkegata 28 AS | Real estate | 2012 |
| Kirkegata 6 Kristiansand AS | Real estate | 2016 |
| Kirkegata 7 AS | Real estate | 2021 |
| Kirkegaten 26 AS | Real estate | 2008 |
| Kirkegt. 6 AS | Real estate | 2026 |
| Kirkelig Kulturfabrikk AS | Arts & recreation | 2023 |
| Kirkenes Event & Invest AS | Arts & recreation | 2013 |
| Kirkesund AS | Construction | 2020 |
| Kirkesund Eiendom AS | Real estate | 2007 |
| Kirkesund Invest AS | Wholesale & retail | 2008 |
| Kirkeveien 18 AS | Real estate | 2017 |
| Kiropraktor Mari AS | Health & social care | 2024 |
| Kirsten Holding AS | Wholesale & retail | 2024 |
| Kiryd AS | Professional & scientific | 2019 |
| Kivik AS | Real estate | 2026 |
| Kix AS | Professional & scientific | 2020 |
| KJ10 Rekom AS | Hospitality | 2016 |
| Kjaer + Loege AS | Manufacturing | 2018 |
| Kjekk AS | | 2026 |
| Kjell & Kjell AS | | 2025 |
| Kjell Eliassen AS | Professional & scientific | 1998 |
| Kjell Rohde Invest AS | | 2017 |
| Kjell Strømme AS Bilforretning | Wholesale & retail | 1968 |
| Kjell Strømme Invest AS | Wholesale & retail | 2005 |
| Kjellemo Bilsenter AS | Other services | 2023 |
| Kjellemo Bilverksted AS | Other services | 2005 |
| Kjellemo Holding AS | | 2005 |
| Kjellevikhansen AS | Construction | 2026 |
| Kjellevold Holding AS | | 2026 |
| Kjemico AS | Wholesale & retail | 2022 |
| Kjerrheia 41 AS | Real estate | 2019 |
| Kjerrheibakken 18 AS | Real estate | 2017 |
| Kjetil Marcussen AS | Wholesale & retail | 2013 |
| Kjetså Eiendom AS | Real estate | 2007 |
| Kjevik Veteranfly SA | Transport & logistics | 2014 |
| KJH Invest AS | | 2005 |
| Kjær Fuglestad AS | | 2022 |