| Klette Samvirkeforetak | Real estate | 2020 |
| Kleven Kystfiske Ans | Agriculture & fishing | 2019 |
| Klifi AS | Real estate | 2005 |
| Klinikk Hanne AS | Health & social care | 2015 |
| Klinikk Ingunn Hovland AS | Other services | 2016 |
| Klinikk S AS | Health & social care | 2012 |
| Klinikk S Drift AS | Health & social care | 2024 |
| Klipp Frisør Bodø AS | Other services | 2019 |
| Klippa Evenes AS | Health & social care | 2007 |
| Klippa Lenvik AS | Health & social care | 2008 |
| Klippa Målselv AS | Health & social care | 2003 |
| Klubbholmen 2 AS | Real estate | 2018 |
| Klæbo Invest AS | | 2022 |
| Kløkstad Tomtelag Felt B2 SA | Real estate | 2014 |
| Kløver AS | Wholesale & retail | 2004 |
| Kløver GK AS | Wholesale & retail | 2006 |
| KM Partner AS | Wholesale & retail | 2016 |
| Knapphus Energi Nord AS | Wholesale & retail | 2017 |
| Knudsen Invest AS | Wholesale & retail | 1993 |
| Knuseriet AS | Mining & quarrying | 2018 |
| Knut Hamsundsvei 42 AS | Real estate | 2011 |
| Knut Holding AS | | 2014 |
| Koa Studio AS | Other services | 2015 |
| Koda Invest AS | Real estate | 2019 |
| Koettlitz Invest AS | | 2024 |
| Kokong Bodø AS | Information & communication | 2024 |
| Kolberg Consulting AS | Professional & scientific | 2025 |
| Kolstad Kiropraktikk AS | Health & social care | 2014 |
| Kolstad Trafikkskole AS | Education | 2013 |
| Kom Heim Kulturpub AS | Hospitality | 2025 |
| Koment Bodø AS | Administrative & support | 2017 |
| Komplett Kjøkken AS | Construction | 2024 |
| Kongens 16 AS | Real estate | 2021 |
| Kongens GT 18 AS | Real estate | 2013 |
| Kongsgården Fysioterapi AS | Health & social care | 1995 |
| Konradsen Holding AS | | 2026 |
| Konsæpt Media Da | Information & communication | 2024 |
| Kontoret AS | Real estate | 2013 |
| Kontrafei Media AS | Professional & scientific | 2020 |
| Kortneset 8 AS | Real estate | 2004 |
| Kortneset Eiendom AS | Real estate | 2025 |
| Kosmo Invest AS | | 2025 |
| Kout AS | Professional & scientific | 2022 |
| KP Nord AS | Wholesale & retail | 2023 |
| KP Nord Eiendom AS | Hospitality | 2023 |
| KP Nord Invest AS | Wholesale & retail | 2023 |
| KR Entreprenør AS | Construction | 2024 |
| KR. Evjen AS | Health & social care | 2025 |
| Kraft Nord AS | Professional & scientific | 2021 |
| Kraftmegling AS | Professional & scientific | 1997 |
| Krafttele AS | Information & communication | 1998 |
| Krav Maga Global - Norway AS | Education | 2012 |
| Kremen AS | Wholesale & retail | 2015 |
| Krevita AS | Real estate | 2012 |
| KRH Eiendom AS | Real estate | 2026 |
| Krisec AS | Professional & scientific | 2024 |
| Krisk AS | | 2024 |
| Kristian Leithe Trafikkskole AS | Education | 2020 |
| Kristin Johannesen AS | | 2026 |
| Kristina AS | Wholesale & retail | 1996 |
| Kristoffersen Fiske Da | Agriculture & fishing | 2015 |
| Kritho AS | | 2025 |
| Krofa AS | Financial services | 2015 |
| Kroi Eiendom AS | Real estate | 2020 |
| Kronlia Holding AS | Health & social care | 2005 |
| Kråkesølv Da | Information & communication | 2009 |
| Kræm AS | Professional & scientific | 2022 |
| Ksi Invest AS | Real estate | 2018 |
| Kuba Svolvær AS | Real estate | 2000 |
| Kula Eiendom AS | Real estate | 2006 |
| Kulta Eiendom AS | Real estate | 2022 |
| Kulta Invest AS | Arts & recreation | 2005 |
| Kunnskapsfondet Nordland AS | Professional & scientific | 2002 |
| Kunnskapskammeret AS | Real estate | 2005 |
| Kunnskapsparken Bodø AS | Professional & scientific | 2001 |
| Kurotek AS | Manufacturing | 2010 |
| Kvalitas AS | Real estate | 2005 |
| Kvarsnes Service AS | Construction | 2014 |
| Kvartal 25 Bodø AS | Real estate | 2009 |
| Kvartal 25 Næring AS | Real estate | 2021 |
| Kvartal 3 Bodø AS | Real estate | 2006 |
| Kvartal 3 Boligsalg AS | Real estate | 2023 |
| KVH Holding AS | Real estate | 2016 |
| Kvikstad Invest AS | | 2020 |
| Kvitberget Eiendom AS | Real estate | 2013 |
| Kyst Kapital AS | Administrative & support | 2025 |
| Kysttele AS | Information & communication | 2005 |
| Kysttele Holding AS | Information & communication | 2015 |
| Kåre Abelsen AS | Wholesale & retail | 2025 |
| Kåring AS | Arts & recreation | 2021 |
| Kåring Tech AS | Information & communication | 2023 |
| L.H. Eiendom AS | Real estate | 2014 |
| L/P Media Da | Professional & scientific | 2023 |
| L21 Eiendom AS | Real estate | 2023 |
| La Det Gro AS | Agriculture & fishing | 2024 |
| Labbetuss Barnehage SA | Education | 1996 |
| Labforum SA | Other services | 2003 |
| Labora AS | Professional & scientific | 2003 |
| Lager Lfa Nord AS | Real estate | 2019 |
| Lakshaugen AS | Real estate | 2011 |