| Kontor Og Grafisk Eiendom AS | Real estate | 2005 |
| Kontorservice Holding AS | Real estate | 2000 |
| Kooperativ Bemanning AS | Administrative & support | 2011 |
| Korsfjord Kystfiske AS | Agriculture & fishing | 2019 |
| KR Arnesen AS | Construction | 2022 |
| Kr-Invest AS | Construction | 2021 |
| KR. Nygård AS | Wholesale & retail | 2015 |
| Kramvika AS | Real estate | 2007 |
| Kran Og Maskinutleie AS | Administrative & support | 2009 |
| Kran Og Maskinutleie Drift AS | Administrative & support | 2022 |
| Kreativ Frisør AS | Other services | 1998 |
| Kreativ Industri AS | Professional & scientific | 2009 |
| KRG Butikkholding AS | | 2026 |
| KRG Invest AS | | 2022 |
| Kristensen Maskin Og Eiendom AS | Real estate | 2021 |
| Kristiansen Rør Og Maskin AS | Construction | 2016 |
| Kristoffer Andersen Transport AS | Transport & logistics | 2019 |
| Kronstad Eiendom AS | Real estate | 1987 |
| Kronstadposten AS | Information & communication | 2014 |
| Krossanes AS | Agriculture & fishing | 2014 |
| Kry Interiør Alta AS | Professional & scientific | 2022 |
| Kulde Og Varmepumpe Service AS | Construction | 2020 |
| Kunneriet AS | Professional & scientific | 2024 |
| Kunnskapsparken Alta AS | Real estate | 2005 |
| Kurt M Heitmann AS | Construction | 2021 |
| Kurth Norge AS | Transport & logistics | 2012 |
| Kuztom Works AS | Other services | 2021 |
| Kvalfjord Eiendomsselskap AS | Real estate | 2006 |
| Kvasetech AS | | 2020 |
| Kvenvik Eiendom AS | | 2026 |
| Kviby Bo -Enheter Og Renovering Da | Construction | 2025 |
| Kyberg Holding AS | Financial services | 2013 |
| Kåre K Kristensen AS | Construction | 1993 |
| L. Danielsen Holding AS | | 2022 |
| L.Pettholding AS | | 2022 |
| Labyrinten 1 AS | Real estate | 2017 |
| Lagerseksjoner Nord AS | Real estate | 2021 |
| Lailavp AS | | 2025 |
| Lakseklyngen SA | Other services | 2016 |
| Lamot AS | Real estate | 2023 |
| Lampe Eiendom AS | Real estate | 2024 |
| Lampe Holding AS | Financial services | 2015 |
| Lampemyra 4 AS | Financial services | 2022 |
| Lampemyra Holding AS | | 2023 |
| Lamutek AS | Administrative & support | 2017 |
| Langnes Laks AS | Agriculture & fishing | 2019 |
| Lapland Norway AS | Administrative & support | 2018 |
| Laponie Holding AS | Wholesale & retail | 2021 |
| Lars Tore Olsen AS | Construction | 2015 |
| Lars-Erik Thomassen AS | | 2021 |
| Larsens Elektro AS | Construction | 1980 |
| Larsens Garasje AS | Administrative & support | 2025 |
| Lasso Holding AS | Other services | 2023 |
| Lasting & Transport Alta AS | Transport & logistics | 2014 |
| Lasting & Transport Eiendom AS | Construction | 2007 |
| Lavvulive Holding AS | | 2018 |
| Le Jardin AS | Other services | 2024 |
| Lekang Consulting AS | Information & communication | 2019 |
| Lensmannsveien AS | Wholesale & retail | 2020 |
| Leone AS | Wholesale & retail | 2019 |
| LEV1 AS | Professional & scientific | 2023 |
| Lille Kjøkken Alta AS | Hospitality | 2018 |
| Lille Komsa Utvikling AS | Real estate | 2021 |
| Lilleli AS | Manufacturing | 2021 |
| Lingjærde Holding AS | Wholesale & retail | 2024 |
| Link Energi AS | Construction | 2022 |
| Lipe AS | Real estate | 2016 |
| Liss Jonas AS | Wholesale & retail | 2012 |
| Litlab Holding AS | | 2026 |
| Livets Hus AS | Real estate | 2022 |
| Livets Hus Gravferd AS | Other services | 2018 |
| Livets Hus Utleie AS | Real estate | 2023 |
| LKK Fysioterapi AS | Health & social care | 2025 |
| LKM Holding AS | | 2021 |
| Locktech Invest AS | Construction | 2020 |
| Lokal Sport AS | Wholesale & retail | 2019 |
| Lonely Rein Holding AS | | 2018 |
| Losvar & Lampe Ans | Construction | 1970 |
| Lukas Invest AS | Real estate | 2005 |
| Luuso AS | Transport & logistics | 2018 |
| Luuso Travel AS | Transport & logistics | 2026 |
| Lyd Og Bilde AS | Wholesale & retail | 1992 |
| Lydersenkurs AS | Education | 2011 |
| Lykkehjørnet AS | Wholesale & retail | 2014 |
| Lyng Rocks AS | Arts & recreation | 2017 |
| Lyngsvingen AS | Real estate | 2019 |
| Lyrek & Johnny AS | Education | 2021 |
| Lávgu (Álttá Sámi Giella- Ja Kulturguovddás) AS | Other services | 2006 |
| Låsbygget AS | Real estate | 2022 |
| Løkkehjørnet Nord AS | Real estate | 1987 |
| Løkkeveien 10 Næring AS | Real estate | 1989 |
| Løkkeveien 115 AS | Real estate | 2013 |
| Løkkeveien 19 AS | Real estate | 2016 |
| Løkkeveien 2-4 AS | Real estate | 1986 |
| Løkkeveien 3 AS | Real estate | 2006 |
| Løkkeveien 33 AS | Real estate | 2017 |
| Løkkeveien 35 AS | Real estate | 2021 |
| Løkkeveien 41-45 AS | Real estate | 2017 |
| Løkkeveien 6 AS | Real estate | 2014 |
| Løkkeveien 8 Alta AS | Real estate | 2022 |