| Keller Transport AS | Transport & logistics | 1976 |
| Kennel Millippi AS | Agriculture & fishing | 2020 |
| Kensa AS | | 2004 |
| Kensal AS | | 2024 |
| Keo Norge AS | Wholesale & retail | 2017 |
| Keo Prosjekt AS | Wholesale & retail | 2020 |
| Kervan Import Intermat Ans | Wholesale & retail | 1990 |
| Keshmiri Holding AS | Real estate | 2019 |
| Kevin Masters Møbelsnekker AS | Manufacturing | 2012 |
| Keycee AS | Hospitality | 2024 |
| Keystone Leasing AS | Administrative & support | 2004 |
| Kfam Holding AS | | 2022 |
| KGR Holding AS | Education | 2022 |
| Khan Motorcenter AS | Wholesale & retail | 2025 |
| Khiem Holding AS | Wholesale & retail | 2020 |
| Khj-Invest AS | Financial services | 1984 |
| Khonsyawashan Transport AS | Transport & logistics | 2025 |
| Ki Bemanning AS | Administrative & support | 2016 |
| Ki Eiendom AS | Real estate | 2000 |
| Ki Investment AS | Professional & scientific | 2023 |
| Ki Utvikling AS | Financial services | 2005 |
| KI2 Invest AS | Real estate | 2012 |
| Kibe Holding AS | Administrative & support | 2016 |
| Kibeko AS | | 2025 |
| Kibo AS | Information & communication | 2016 |
| Kickside AS | | 2020 |
| Kiddobooko AS | Information & communication | 2024 |
| Kids at Work Eiendom AS | Real estate | 2023 |
| Kids at Work Holding AS | Wholesale & retail | 2021 |
| Kiki Holding AS | Education | 2024 |
| Kikkut AS | Professional & scientific | 2012 |
| Kilar AS | Real estate | 2004 |
| Kilbro Eiendom AS | Real estate | 2022 |
| Kilinc Eiendom AS | Real estate | 2017 |
| Killy Invest AS | Financial services | 2017 |
| Kim Carpenters AS | Construction | 2023 |
| Kinara AS | Hospitality | 2015 |
| Kinesisk Norsk Handelsselskap AS | Financial services | 1985 |
| King Kong Holding AS | | 2021 |
| Kings Arms Drammen AS | Hospitality | 2018 |
| Kira Fashion AS | Wholesale & retail | 2024 |
| Kira Motors AS | Wholesale & retail | 2026 |
| Kirici Holding AS | | 2025 |
| Kirkegaten 8 Drammen AS | Real estate | 2019 |
| Kirkegt 13/15 AS | Real estate | 1991 |
| Kirkeng Eiendom AS | Real estate | 1989 |
| Kirkeng Eiendomsinvest AS | Real estate | 2020 |
| Kirkens Bymisjon Arbeidsmarkedstiltak AS | Health & social care | 2021 |
| Kirkens Bymisjon Miljø AS | Water & waste | 2018 |
| Kirkens Publikasjon AS | Professional & scientific | 2015 |
| Kirkerud Holding AS | | 2020 |
| Kirkestien Consulting AS | Professional & scientific | 2019 |
| Kirkestien Invest AS | Professional & scientific | 2005 |
| Kiropraktikk I Sentrum AS | Health & social care | 2008 |
| Kiropraktor Hans Christian Eriksen AS | Health & social care | 2014 |
| Kiropraktor Trym Haagensen AS | Health & social care | 2013 |
| Kis Kompetanse AS | Education | 2001 |
| Kis Øst AS | Manufacturing | 2002 |
| Kitra AS | Real estate | 2024 |
| Kjappen Holding AS | Financial services | 2005 |
| Kjedehuset Eiendom AS | Real estate | 2006 |
| Kjeholmen Climate Response AS | | 2026 |
| Kjeks Utvikling Da | Information & communication | 2000 |
| Kjell Egils Isolering AS | Construction | 2012 |
| Kjellengveien 7 AS | Real estate | 2018 |
| Kjeller Von Abusdal Invest AS | Financial services | 2010 |
| Kjemperud AS | Professional & scientific | 2013 |
| Kjemprud AS | Wholesale & retail | 1981 |
| Kjemprud Invest AS | | 1997 |
| Kjerneboring Og Betongsaging AS | Construction | 2018 |
| Kjerraten 19 AS | Real estate | 2006 |
| Kjerraten 4 AS | Real estate | 2017 |
| Kjerraten Barnehage SA | Education | 1997 |
| KJJ Flis Og Interiør AS | Construction | 2010 |
| Kjord AS | Real estate | 2005 |
| Kjöter Da | Arts & recreation | 2023 |
| Kjøkkeneventyret AS | | 2025 |
| Kjøkkenlogistikk AS | Wholesale & retail | 2009 |
| Kjøkkenmontasje AS | Construction | 2022 |
| Kjøkkensenteret Drammen AS | Wholesale & retail | 1987 |
| Kjøpmann Fuglesang AS | Wholesale & retail | 2021 |
| Kjøsterud Holding AS | Administrative & support | 2023 |
| KK Accounting AS | Professional & scientific | 2023 |
| KK Eiendom Drammen AS | Real estate | 2017 |
| KK Holding Drammen AS | Real estate | 2017 |
| KK Håndtverk Ans | Construction | 2007 |
| KK Håndverk AS | Construction | 2011 |
| KK Murprodukter AS | Wholesale & retail | 2005 |
| KK Total Teknikk AS | Construction | 2018 |
| Klaververkstedet Musikksenter AS | Other services | 2016 |
| Kleffmann-Einrichtungen Limited Zweigniederlassung Deutscland | Construction | 2009 |
| Kleiveren Skog Ans | Agriculture & fishing | 1968 |
| Klem AS | Information & communication | 2005 |
| Klemetsen Invest AS | | 2021 |
| Klevjerparken AS | Real estate | 2021 |
| KLH Home Invest AS | Professional & scientific | 2021 |
| Klikkbait AS | Information & communication | 2026 |
| Klimastål AS | Wholesale & retail | 2023 |
| Klinikk Haukeland AS | Health & social care | 2016 |
| Klipp Meg AS | Other services | 2022 |