| Kahel Da | Information & communication | 2017 |
| Kahi AS | Other services | 2024 |
| Kahlbom & Co AS | Construction | 2013 |
| Kahlman Produkter AB | Manufacturing | 2006 |
| Kahlon Brasserie & Bar AS | Hospitality | 2025 |
| Kahlon Consulting AS | Hospitality | 2015 |
| Kahlon Gruppen AS | Hospitality | 2022 |
| Kahn AS | | 2020 |
| Kahoot! AS | Information & communication | 2011 |
| Kahoot! International 2 AS | Information & communication | 2021 |
| Kahoot! International AS | Information & communication | 2019 |
| Kahrs Holding AS | Financial services | 2015 |
| Kahu AS | Information & communication | 2019 |
| Kahu Earth AS | Information & communication | 2025 |
| Kai Kran AS | Professional & scientific | 2012 |
| Kai Oslo AS | Wholesale & retail | 2022 |
| Kai Vidar Kvade AS | Real estate | 2012 |
| Kaia AS | Professional & scientific | 2020 |
| Kaia Mobility AS | Professional & scientific | 2022 |
| Kaia Ventures AS | | 2026 |
| Kaiba Technologies AS | Information & communication | 2021 |
| Kaibo AS | Hospitality | 2013 |
| Kaibygning 1 AS | Real estate | 2018 |
| Kaibygning 2 AS | Real estate | 2013 |
| Kaicas AS | Wholesale & retail | 1986 |
| Kaifre AS | | 2024 |
| Kaigaten 9 AS | Real estate | 2019 |
| Kaija Bjelland AS | Professional & scientific | 2015 |
| Kainos AS | Professional & scientific | 2017 |
| Kainvest AS | | 2019 |
| Kairos Holding AS | Health & social care | 2022 |
| Kairos Invest AS | | 2023 |
| Kairos Web Design AS | Information & communication | 2026 |
| Kairos Works AS | Health & social care | 2008 |
| Kairos World AS | Education | 2023 |
| Kaisa 1 Holding AS | Professional & scientific | 2016 |
| Kaisa Kapital AS | | 2021 |
| Kaiveien 23-27-29 AS | Real estate | 2024 |
| Kaixo Nordic AS | Professional & scientific | 2015 |
| Kaizan Design Ans | Professional & scientific | 1995 |
| Kaizen Holding AS | Professional & scientific | 2024 |
| Kaizen Tech AS | Information & communication | 2021 |
| Kaj Film AS | Information & communication | 2024 |
| Kaja Dahl Invest AS | Information & communication | 2021 |
| Kaja Garden AS | Financial services | 2013 |
| Kaja Kittang Kvande AS | Professional & scientific | 2016 |
| Kaja Kvernbakken AS | Arts & recreation | 2021 |
| Kaja Voss Holding AS | | 2021 |
| Kajac AS | Financial services | 2005 |
| Kajalund Eiendom AS | Real estate | 2015 |
| Kajlie Holding AS | Education | 2023 |
| Kajohansen Ans | Information & communication | 2020 |
| Kajuka AS | | 1997 |
| Kak Equity AS | Financial services | 2009 |
| Kak Shipping Invest AS | Financial services | 2009 |
| Kakadu AS | Hospitality | 2018 |
| Kakadu Holding AS | Hospitality | 2024 |
| Kakadue Invest AS | Real estate | 2014 |
| Kakao AS | Information & communication | 2020 |
| Kakariko Trading AS | Wholesale & retail | 2024 |
| Kakart AS | Information & communication | 2025 |
| Kakb Invest AS | | 2020 |
| Kakeriet Da | Manufacturing | 2007 |
| Kakg Holding AS | | 2024 |
| Kakibue Media AS | Information & communication | 2012 |
| Kakkel AS | Wholesale & retail | 2023 |
| Kakkelovnskroken 1 AS | Real estate | 2005 |
| Kakkelovnskroken 2 Eiendom AS | Real estate | 2004 |
| Kakken AS | Professional & scientific | 2018 |
| Kakofoni AS | Information & communication | 2022 |
| Kakoi & Kakaos AS | | 2025 |
| Kaktus Eiendom 47 AS | Real estate | 2020 |
| Kaktus Eiendom 51 AS | Real estate | 2020 |
| Kaktus Eiendom Nordstrand AS | Real estate | 2020 |
| Kaktus Holding AS | | 2021 |
| Kaktus Mat AS | Wholesale & retail | 1994 |
| Kala Invest AS | | 2026 |
| Kala Utvikling AS | Real estate | 2017 |
| Kalai AS | | 2023 |
| Kalandra AS | Information & communication | 2023 |
| Kalars AS | Financial services | 2016 |
| Kalbakken Bil AS | Wholesale & retail | 2020 |
| Kalbakken Bilspa & Shine AS | Other services | 2025 |
| Kalbakken Blikkenslagerverksted AS | Construction | 2020 |
| Kalbakken Eiendom AS | Real estate | 2019 |
| Kalbakken Garasjelag SA | | 1969 |
| Kalbakken Helsehus AS | Health & social care | 2023 |
| Kalbakken Legegruppe AS | Health & social care | 2022 |
| Kalbakken Storkiosk Ans | Wholesale & retail | 1995 |
| Kalbakken Tannlegesenter AS | Health & social care | 1998 |
| Kalbakken Utvikling AS | Real estate | 2020 |
| Kalbakkenklinikken AS | Health & social care | 2015 |
| Kalbakkenklinikken Fysikalske Og Kiropraktor AS | Health & social care | 2019 |
| Kalbakkveien 46 AS | Real estate | 2000 |
| Kalbakkveien 6 AS | Real estate | 2015 |
| Kalbold AS | Real estate | 2004 |
| Kald AS | Manufacturing | 2022 |
| Kaldager Holding AS | | 2024 |
| Kaldbakken Eiendomsutvikling AS | Real estate | 2002 |
| Kaldbakken Mat AS | Wholesale & retail | 2011 |