| Kjøkken Og Design AS | Wholesale & retail | 2013 |
| Kk-Invest AS | Financial services | 2005 |
| Klavenes Craft AS | Professional & scientific | 2018 |
| Kleiva Eiendom AS | Real estate | 2023 |
| Klippen Frisør Narvik AS | Other services | 2004 |
| KM Maskinkonsult AS | Construction | 1999 |
| Knit Narvik AS | Wholesale & retail | 2024 |
| Kognitiv Konsulent Barbro Hultstedt AS | Health & social care | 2017 |
| Kombinertkari AS | Wholesale & retail | 2026 |
| Kompetansepartner Narvik AS | Professional & scientific | 2026 |
| Kongens Gate 30 Narvik AS | Real estate | 2021 |
| Kongens GT. 34 AS | Real estate | 2023 |
| Kongensgt 39-43 AS | Real estate | 2011 |
| Kongensgt 41 AS | Real estate | 2016 |
| Kosmo Holding AS | | 2021 |
| KR Hansen Engrosbygg AS | Real estate | 1998 |
| KR. Hansen Engros Holding AS | Real estate | 2005 |
| Krakelere Stein- Og Keramikkverksted AS | Manufacturing | 2025 |
| Kran Og Entreprenørtjenester AS | Construction | 2013 |
| Kri Holding AS | | 2018 |
| Krølle AS | Health & social care | 2025 |
| Kubera AS | Real estate | 2001 |
| Kufiskvika Gård AS | Agriculture & fishing | 2024 |
| Kuraas AS | Manufacturing | 1997 |
| Kvadraten AS | Real estate | 1987 |
| Kvannvatn Kraft AS | Energy | 2000 |
| Kvanta 2 AS | Real estate | 2019 |
| KW Invest AS | Financial services | 2015 |
| Kuraas & Sønner AS | | 1966 |
| Lambertsson Kran AB Nuf | Administrative & support | 2012 |
| Lege Bernard Holthe AS | Health & social care | 2015 |
| Lege Hilde Laukvik AS | Health & social care | 2024 |
| Lege Sverre Vollen AS | Health & social care | 2019 |
| Legesenter Utleie KG 36 AS | Real estate | 2000 |
| Leif K Fjelde AS | Construction | 2022 |
| Lilja AS | Other services | 2020 |
| Lillevik Formidling AS | Arts & recreation | 2019 |
| Lilly Blomster AS | Wholesale & retail | 2022 |
| Linda Invest AS | | 2021 |
| Lindahl AS | Wholesale & retail | 2014 |
| Lindahl Bolig I AS | Real estate | 2014 |
| Lindahl Bolig II AS | Real estate | 2014 |
| Lindahl Eiendommer AS | Real estate | 1992 |
| Lindahl Investering AS | Wholesale & retail | 2015 |
| Linken Pictures AS | Information & communication | 2018 |
| Linken Tannteknikk AS | Manufacturing | 1988 |
| Lisa Massasje Og Velvære AS | Other services | 2023 |
| Lkab Malmtrafikk AS | Transport & logistics | 1995 |
| Lkab Norge AS | Transport & logistics | 1901 |
| Lofoten Og Senja Rorbuer AS | Hospitality | 2018 |
| LPX AS | | 2022 |
| LTP Holding AS | Construction | 1993 |
| Lukas I AS | Real estate | 2006 |
| Lunds Energi Norge AS | Energy | 1998 |
| Lunsj AS | Hospitality | 2016 |
| Lunt Hus AS | Real estate | 1984 |
| LWB Entreprenør AS | Construction | 2022 |
| Lyckan AS | | 2025 |
| Løsningsorientert AS | Information & communication | 2013 |
| Løvslett Consult AS | Professional & scientific | 2017 |
| M Sørensen Holding AS | Health & social care | 2014 |
| M-K Bygg AS | Construction | 2020 |
| M.Jørgensen Holding AS | | 2017 |
| Maestro Vin AS | Hospitality | 2025 |
| Magne Pedersen AS | Professional & scientific | 2000 |
| Magnus Bergs Gate 8 AS | Real estate | 2016 |
| Mahol Invest AS | | 2021 |
| Malmat Invest AS | | 2021 |
| Malmbyen AS | | 2026 |
| Malmen Pub AS | Hospitality | 1990 |
| Malmklumpen Barnehage SA | Education | 1989 |
| Manuellterapeut Ingrid Elise Heimdal AS | Health & social care | 2021 |
| Marba AS | Construction | 2026 |
| Marevent Narvik AS | Agriculture & fishing | 2021 |
| Maria Bastian AS | Hospitality | 2024 |
| Maria Frisør AS | Other services | 2018 |
| Maritim Eiendom AS | Real estate | 2000 |
| Maritimt Forum Nord SA | Other services | 2011 |
| Markussens Begravelsesbyrå AS | Other services | 2023 |
| Marlow Foods Ltd | Transport & logistics | 2008 |
| Masa Holding AS | Financial services | 2005 |
| Maskin Og Kran Opplæring AS | Education | 2013 |
| Maskin-Invest AS | Wholesale & retail | 2011 |
| Maskinentreprenør Kristian Kristiansen AS | Construction | 2000 |
| Masulo AS | | 2026 |
| Mathisen & Mathisen AS | Wholesale & retail | 1990 |
| Maz Service AS | Construction | 2021 |
| MDR AS | | 2021 |
| Meko Holding AS | Other services | 2011 |
| Mellingen Service AS | Construction | 2018 |
| Mes Consult AS | Professional & scientific | 2023 |
| Michelle B. Opshaug Holding AS | Financial services | 2015 |
| Midco 1 AS | | 2021 |
| Midco 2 AS | | 2021 |
| Midnight Sun Adventures Da | Administrative & support | 1998 |
| Midtschille Holding AS | | 2021 |
| Millejordnes AS | Hospitality | 1990 |
| Mimir Holdco AS | Information & communication | 2019 |
| Mist Rådgivning AS | Professional & scientific | 2021 |
| Mits Holding AS | | 2021 |