| Klokkergaarden Kultur- Og Naturbarnehage AS | Education | 2022 |
| Klokt AS | Professional & scientific | 2020 |
| Klopptjernsgata 4 AS | Real estate | 2014 |
| Klubbkameratene AS | Wholesale & retail | 2020 |
| KM Auto AS | Wholesale & retail | 2022 |
| KM Car Service AS | Other services | 2020 |
| KM Kapital AS | Professional & scientific | 2022 |
| KM Steen Invest AS | Financial services | 2016 |
| KMS Eiendom AS | Real estate | 2008 |
| Knarr Handel AS | Professional & scientific | 2020 |
| Knekk'N Kiosk Da | Wholesale & retail | 2000 |
| Knive Gris AS | Agriculture & fishing | 2007 |
| Knive Gård AS | Agriculture & fishing | 2005 |
| Knive Laks AS | Agriculture & fishing | 2018 |
| Kniveåsen AS | Real estate | 1996 |
| Knox Energy Solutions AS | Professional & scientific | 2017 |
| Knut Hansen VKH AS | | 2023 |
| Knut Ødegaard & Co AS | Wholesale & retail | 1989 |
| Knutsen Eiendom AS | Real estate | 1987 |
| Kob 93 AS | Real estate | 2018 |
| Kobbervikdalen 117 AS | Real estate | 2016 |
| Kobbervikdalen 149 AS | Real estate | 2012 |
| Kobbervikdalen 87 AS | Real estate | 2018 |
| Kobbervikdalen DV AS | Real estate | 2022 |
| Kobbervikdalen WG AS | Real estate | 2022 |
| Kobla AS | Information & communication | 2019 |
| Kogger AS | Professional & scientific | 2015 |
| Koi Gruppen AS | Professional & scientific | 2023 |
| Koi Gruppen Holding AS | Professional & scientific | 2022 |
| Kollevåg AS | | 2021 |
| Kolstad's Holding AS | Construction | 1991 |
| Kolumna Holding AS | Health & social care | 2020 |
| Kom-Hi Fi AS | Wholesale & retail | 2002 |
| Komfortformel AS | Professional & scientific | 2024 |
| Kommunikasjons- Og Medieeksperten Tom Berntzen AS | Professional & scientific | 2015 |
| Komorebi AS | Information & communication | 2022 |
| Kompan Norge AS | Wholesale & retail | 2006 |
| Komplett Bilservice AS | Other services | 2014 |
| Komplett Sprinkler AS | Construction | 2023 |
| Komptek AS | Manufacturing | 2022 |
| Konger Og Keisere SA | Arts & recreation | 2019 |
| Kongh Invest AS | Real estate | 2025 |
| Konghellegata 8 Næring AS | Real estate | 2022 |
| Kongsgårdmoen Næringspark AS | Real estate | 2012 |
| Konnerud Apotek AS | Wholesale & retail | 2021 |
| Konnerud B1 AS | Real estate | 2024 |
| Konnerud Bilshine AS | Other services | 2023 |
| Konnerud Blikk AS | Construction | 1993 |
| Konnerud Byggservice AS | Construction | 2013 |
| Konnerud Fysioterapi Da | Health & social care | 1999 |
| Konnerud Hår & Velvære AS | Other services | 2020 |
| Konnerud Kode AS | Information & communication | 2025 |
| Konnerud Legesenter AS | Health & social care | 2020 |
| Konnerud Mur Og Flis AS | Construction | 2020 |
| Konnerud Rørleggerbedrift AS | Construction | 2024 |
| Konnerud Rørservice AS | Construction | 2024 |
| Konnerud Senter AS | Real estate | 2007 |
| Konnerud Servicesenter AS | Wholesale & retail | 2026 |
| Konnerud Takst AS | Real estate | 2016 |
| Konnerud Tannlegesenter AS | Health & social care | 2022 |
| Konnerud Trafikkskole AS | Education | 2014 |
| Konnerud Utvikling Næring AS | Real estate | 2019 |
| Konnerudgata 28 - 4 AS | Real estate | 2019 |
| Konnerudgata 324 AS | Real estate | 2018 |
| Konnerudgata Alltid AS | Wholesale & retail | 2021 |
| Konnerudkollen Vann Og Avløpslag SA | Water & waste | 2026 |
| Kontorcompaniet AS | Wholesale & retail | 1981 |
| Kontorhuset Bragernes AS | Real estate | 1998 |
| Kontorhuset Drift AS | Real estate | 2017 |
| Kontroll-Øst Ans | Professional & scientific | 2025 |
| Kontrollflyt AS | Information & communication | 2016 |
| Konvoluttering & Print Ans | Manufacturing | 2010 |
| Koohinoor Trading Company Ans | Wholesale & retail | 2002 |
| Kopec Takservice AS | Construction | 2025 |
| Kophamer Holding AS | | 2025 |
| Kopstad Og Kure Revisjon AS | Professional & scientific | 2019 |
| Korni Næringspark AS | Real estate | 2012 |
| Kosmetisk Dermatologisk Sykepleier Linn Røste Moe AS | Health & social care | 2018 |
| Kozlen Investment AS | | 2019 |
| Kozlen Marketing AS | Professional & scientific | 2026 |
| KPM Holding AS | | 2023 |
| Kraft AI AS | Information & communication | 2019 |
| Kraft Mining Da | Information & communication | 2021 |
| Kransberg AS | Wholesale & retail | 1995 |
| Kransberg Holding AS | | 2026 |
| Kransen Holding AS | Real estate | 2018 |
| Krb-S AS | Other services | 2021 |
| Kreaktiv Kunst Kollektiv Da | Education | 2008 |
| Krekling Consult AS | Information & communication | 2011 |
| Kricla AS | Financial services | 2017 |
| Krikal AS | Professional & scientific | 2005 |
| Krineb Invest AS | | 2020 |
| Kringvern Ans | Information & communication | 2002 |
| Krisbygg Service AS | Construction | 2015 |
| Kristiansen Montasje AS | Construction | 2015 |
| Krobbez AS | Arts & recreation | 2025 |
| Krogh & Foss Holding AS | Financial services | 2020 |
| Krogh & Foss Pensjon Og Forsikring AS | Financial services | 2019 |
| Krokstad Terrasse AS | Real estate | 2012 |
| Krone Hanssen Holding AS | Wholesale & retail | 2005 |