| Kilengt. 33 AS | Transport & logistics | 2008 |
| Kilenhjørnet AS | Real estate | 2017 |
| Kilentunet AS | Real estate | 2004 |
| Kilgata 18 AS | Real estate | 2008 |
| Kilgata 23 AS | Real estate | 2008 |
| King Invest AS | Wholesale & retail | 2017 |
| Kingo AS | Wholesale & retail | 2006 |
| Kirderf AS | Real estate | 2019 |
| Kirkeveien 213 AS | Real estate | 2009 |
| Kiropraktisk Senter AS | Health & social care | 2025 |
| Kiropraktor Gustav Sellergren Ans | Health & social care | 1990 |
| Kiropraktor Linda Göransdotter Ohren AS | Health & social care | 2013 |
| Kiropraktor Thomas Solberg AS | Health & social care | 2014 |
| Kiropraktor Øyvind Nilsson AS | Health & social care | 1998 |
| Kirovital AS | Health & social care | 1998 |
| Kirsebom Holding AS | | 2008 |
| Kjellenghøyden AS | Real estate | 2019 |
| Kjellengveien 2 AS | Real estate | 1995 |
| Kjelsåsveien 168 Da | Real estate | 1998 |
| Kjelsåsveien 168 Eiendom AS | Real estate | 2006 |
| Kjærstranda Og Omegn Vann- Og Avløpslag SA | Water & waste | 2015 |
| Kjøkkentid AS | Wholesale & retail | 2006 |
| Kjølberg Produksjon AS | Information & communication | 2015 |
| KK Bygg AS | Construction | 2022 |
| KK Bygg Eiendom AS | Real estate | 2006 |
| KK Management AS | Administrative & support | 2011 |
| Kkci AS | Arts & recreation | 2017 |
| Klemmetsby - Firing Begravelsesbyrå AS | Other services | 1990 |
| Klemmetsby Blomster AS | Wholesale & retail | 2006 |
| Klemo Holding AS | | 2019 |
| KLG 6 AS | Real estate | 2025 |
| Klikkbar Media AS | Professional & scientific | 2020 |
| Klinikk Estetikk AS | Health & social care | 2019 |
| Klinikk for Naturmedisin Og Alternativ Terapi Ans | Health & social care | 2003 |
| Klinikk Psykiatri Og Helse AS | Health & social care | 2024 |
| Klippegalleriet AS | Other services | 2009 |
| Klippotek Petite AS | Other services | 1989 |
| Klokseth Eide Invest AS | Financial services | 2018 |
| Klopp AS | Information & communication | 2011 |
| Klopp Eiendom AS | | 2021 |
| Klopp Sauna AS | Real estate | 2024 |
| Klostergaten 1 AS | Real estate | 2020 |
| KM Hus AS | Construction | 2022 |
| KMT Malerfirma AS | Construction | 2023 |
| KN Byggservice AS | Construction | 2023 |
| Knatland Holding AS | | 2024 |
| Knockout Holding AS | Wholesale & retail | 2023 |
| Knudsrød Rådgivning AS | Professional & scientific | 2016 |
| Knut Petterson Eiendom AS | Real estate | 2009 |
| Kogniflow AS | Information & communication | 2026 |
| Koht & Rygg AS | Arts & recreation | 2009 |
| Koksnes AS | Real estate | 2005 |
| Kompetanse AS | Education | 2019 |
| Kongegata 20 AS | Real estate | 2008 |
| Kongens Gate 11 AS | Real estate | 2023 |
| Konseptinvest AS | Professional & scientific | 2021 |
| Kornbandet AS | Real estate | 2019 |
| Koster Eiendom AS | | 2017 |
| KP Tomt 3 AS | Real estate | 2019 |
| Kravik Gjelstad AS | Health & social care | 2022 |
| Krem Tattoo Da | Other services | 2026 |
| Krez AS | | 2021 |
| Kristiansen & Kristiansen AS | Real estate | 2025 |
| Kristiansen & Kværne AS | | 2021 |
| Kristiansen AS | Construction | 2021 |
| Kristina Kvarteret AS | Real estate | 2009 |
| Kristron Capital AS | | 2026 |
| Krogri AS | Real estate | 2020 |
| Kroks-Rom AS | Other services | 2020 |
| Kroppen Fysioterapi AS | Health & social care | 2020 |
| Krämer Holding AS | Real estate | 2005 |
| Krøger & Myhre AS | Construction | 2021 |
| Krøier Holding AS | Health & social care | 2021 |
| Krøy AS | | 2020 |
| KSJ Invest AS | | 2014 |
| Kta Holding AS | Financial services | 2005 |
| Kundeoppfølging AS | Information & communication | 2026 |
| Kvan Invest AS | Health & social care | 2021 |
| Kvantumklinikken AS | Health & social care | 2019 |
| Kveda AS | | 2020 |
| Kveil Invest AS | Real estate | 2014 |
| Kverneriet AS | Hospitality | 2012 |
| Kvernhusengen Holding AS | Administrative & support | 2018 |
| Kvikk Markiser AS | Wholesale & retail | 2023 |
| Kvikkeline Helsekost AS | Wholesale & retail | 1986 |
| Kvinnedoktor Og Jordmora AS | Health & social care | 2017 |
| Kvänum Kjøkkenstudio Tønsberg AS | Wholesale & retail | 2014 |
| Kystveien 40 AS | Real estate | 1994 |
| Kåre Lian Eiendom AS | Real estate | 2005 |
| Kølner AS | Professional & scientific | 2000 |
| L&K Frebergsvik Butikkdrift AS | Wholesale & retail | 2026 |
| L4RSEN Holding AS | Real estate | 2014 |
| La Pergola Tønsberg AS | Hospitality | 2015 |
| LA4 Invest AS | | 2024 |
| Laborem AS | Real estate | 2016 |
| LABS2 Norge AS | Information & communication | 1998 |
| Lagabøte AS | Information & communication | 2026 |
| Laird-K AS | Professional & scientific | 2016 |
| Landskapslaget AS | Professional & scientific | 2020 |
| Landén Productions AS | Professional & scientific | 2016 |