| Knudowsen Holding AS | Mathopen | 2024 |
| Knusla AS | Vollen | 2007 |
| Knut Halfdan Svendsen AS | Langesund | 2017 |
| Knut Hordnes AS | Rådal | 2011 |
| Knut Jarl Jøsok Holding AS | Olsvik | 2005 |
| Knut Rikard Lunde AS | Oslo | 1998 |
| KNV Holding AS | Vikeså | 2025 |
| Kobbevik Helse AS | Lillehammer | 2026 |
| Kockum Primary Care Consulting | Se-211 12 Malmö | 2023 |
| Kofferdam AS | Oslo | 2017 |
| KOFFERDAM2 AS | Oslo | 2026 |
| Kognit AS | Straume | 2019 |
| Kognitiv Konsulent Barbro Hultstedt AS | Narvik | 2017 |
| Kognitivklinikken AS | Oslo | 2016 |
| Kognito AS | Oslo | 2015 |
| Kohinoor AS | Drøbak | 2022 |
| Koi AS | Oslo | 2005 |
| Koieklinikken AS | Elverum | 2025 |
| Kokstad Medisinske Senter AS | Kokstad | 2021 |
| Kokstad Tannlegepraksis AS | Kokstad | 2014 |
| Kokvold Holding AS | Åfjord | 2025 |
| Kolbotn Fysikalske Institutt Da | Kolbotn | 2010 |
| Kolbotn Helse | Sofiemyr | 2001 |
| Kolbotn Hudlegesenter AS | Trollåsen | 2016 |
| Kolbotn Legesenter AS | Kolbotn | 2012 |
| Kolbotn Naprapatklinikk AS | Kolbotn | 2015 |
| Kolbotn Tannklinikk AS | Sofiemyr | 2012 |
| Kolbotn Tannlegesenter AS | Sofiemyr | 2005 |
| Kolbotn Tannregulering AS | Kolbotn | 2009 |
| Kolbotntannlegene AS | Kolbotn | 2015 |
| Koleg AS | Kongsvinger | 1987 |
| Kolnesstranden Gård AS | Sola | 2025 |
| Kolsing Bang Holding AS | Vega | 2024 |
| Kolstad Kiropraktikk AS | Bodø | 2014 |
| Kolstad Tannlegesenter AS | Saupstad | 2021 |
| Kolumna Holding AS | Drammen | 2020 |
| Koma Service Nuf | Alversund | 2007 |
| Kommunelegene I Holmestrand Da | Holmestrand | 2013 |
| Kommunelegene I Nordkapp Ans | Honningsvåg | 2004 |
| Kommuneoverlegene AS | Oslo | 2025 |
| Kompella Mottaksdrift AS | Borkenes | 2025 |
| Kompetansesentervest AS | Haugesund | 2020 |
| Kompetansesentervest Bpa AS | Haugesund | 2024 |
| Kompetensen I Kristianstad AB | Se-211 43 Malmö | 2017 |
| Kompis Avlastning AS | Voss | 2023 |
| Komplett HMS Drift AS | Bergen | 2014 |
| Kongens Plass Medisinske Senter AS | Kristiansund N | 2022 |
| Kongensgate Tannklinkk AS | Sandefjord | 2011 |
| Kongsbakken Tannklinikk AS | Tromsø | 2009 |
| Kongsberg Fotterapi AS | Kongsberg | 2021 |
| Kongsberg Fysioterapi AS | Kongsberg | 2014 |
| Kongsberg Tannlegesenter AS | Kongsberg | 2009 |
| Kongsberg Tannregulering AS | Kongsberg | 2015 |
| Kongsberg Øre-Nese-Hals Klinikk AS | Kongsberg | 2014 |
| Kongsberg Øyeklinikk AS | Asker | 2005 |
| Kongsgården Fysioterapi AS | Bodø | 1995 |
| Kongsvinger Hudcenter AS | Kongsvinger | 2016 |
| Kongsvinger Laserklinikk AS | Kongsvinger | 2021 |
| Kongsvinger Spa AS | Kongsvinger | 2003 |
| Kongsvinger Tannregulering AS | Kongsvinger | 2014 |
| Kongsvinger Øre Nese Hals AS | Kongsvinger | 2022 |
| Kongtorp Fysioterapi Og Trening AS | Vågå | 2024 |
| Konkoi AS | Sandvika | 2015 |
| Konnerud Fysioterapi Da | Drammen | 1999 |
| Konnerud Legesenter AS | Drammen | 2020 |
| Konnerud Tannlegesenter AS | Drammen | 2022 |
| Konsept Helse AS | Bekkestua | 2026 |
| Konsulent Tor Erling Tømmerbakk AS | Tverlandet | 2024 |
| Kontorfellesskapet Fysio 1 AS | Ørsta | 2017 |
| Kontorfellesskapet Huseby Legesenter Da | Oslo | 2001 |
| Kontorfellesskapet I Rosenkrantz GATE7 Da | Oslo | 2022 |
| Kontura AS | Frekhaug | 2026 |
| Konval Dental AS | Førde | 2020 |
| Konval Holding AS | Førde | 2020 |
| Kopervik Legesenter SA | Kopervik | 2002 |
| Kordis AS | Høvik | 2023 |
| Kordis Holding AS | Høvik | 2022 |
| Kornsjø Fotterapi AS | Kornsjø | 2024 |
| Kornstad Holding AS | Averøy | 2020 |
| Korpeveien Legeklinikk AS | Mjøndalen | 2020 |
| Korsegata Tannhelse AS | Ålesund | 2021 |
| Korvetten Tannklinikk AS | Brevik | 2005 |
| Kos AS | Ridabu | 2022 |
| Kosam AS | Oslo | 2014 |
| Kosmed AS | Larvik | 2015 |
| Kosmetisk Dermatologisk Sykepleier Linn Røste Moe AS | Drammen | 2018 |
| Kosmetisk Sykepleier Linda Larsen AS | Gullaug | 2024 |
| Kosmetisk Sykepleier Yvonne Thunem AS | Sandnes | 2015 |
| Kosmo Medical AS | Oslo | 2017 |
| Kosthjelpen AS | Sandefjord | 2020 |
| Kostholdsendring AS | Oslo | 2021 |
| Kostholdstreneren AS | Namsos | 2025 |
| Kottakkakathu AS | Sjøvegan | 2017 |
| Kovalent AS | Florvåg | 2022 |
| Kr-Mh AS | Stord | 2024 |
| KR. Evjen AS | Bodø | 2025 |
| Kra AS | Oslo | 2013 |
| Kraag AS | Oslo | 2015 |
| Kraft Coaching Og Massasje AS | Espeland | 2024 |
| Kraft Helse AS | Nesodden | 2018 |