| Kaiso AS | Tønsberg | 2019 |
| Kaja Stabell AS | Storslett | 2012 |
| Kakapo AS | Knarrevik | 2026 |
| Kala TMS AS | Bryne | 2025 |
| Kalbakken Helsehus AS | Oslo | 2023 |
| Kalbakken Legegruppe AS | Oslo | 2022 |
| Kalbakken Tannlegesenter AS | Oslo | 1998 |
| Kalbakkenklinikken AS | Oslo | 2015 |
| Kalbakkenklinikken Fysikalske Og Kiropraktor AS | Oslo | 2019 |
| Kale AS | Åsgårdstrand | 2005 |
| Kalfaret Familieterapi Klinikk AS | Hjellestad | 2026 |
| Kalfaret Legesenter Da | Bergen | 2001 |
| Kali Hud- Og Helseterapi AS | Os | 2009 |
| Kallos AS | Holmestrand | 2021 |
| Kalmarhuset Tannklinikk AS | Bergen | 2025 |
| Kaltoft Margit Staum | Dk-4000 Roskilde | 1995 |
| Kalvskinnet Legesenter Da | Trondheim | 1979 |
| Kambo Legesenter AS | Moss | 2001 |
| Kamerado AS | Oslo | 2022 |
| Kamfjord Tannlege AS | Oslo | 2019 |
| Kamille Holding AS | Oslo | 2005 |
| Kampkompis AS | Hosle | 2025 |
| Kamro AS | Kristiansand S | 2018 |
| Kamsgaard Psykologtjenester AS | Revetal | 2026 |
| Kamøy Enterprises AS | Oslo | 1994 |
| Kanaldrift AS | Rådal | 2013 |
| Kanmer Arbeidsinkludering AS | Årnes | 2022 |
| Kannik Fysikalske Institutt AS | Stavanger | 2012 |
| Kantarellen Legesenter Da | Oslo | 2007 |
| Kaos Teori SA | Ålesund | 2024 |
| Kap Holding AS | Oslo | 2005 |
| Kapabel Helse & Idrett AS | Bodø | 2017 |
| Kapabel Helseklinikk AS | Halden | 2022 |
| Kapp Fysioterapi Da | Kapp | 2017 |
| Kapro AS | Karasjok | 1999 |
| Kapto AS | Børsa | 2002 |
| Kardiodex AS | Bergen | 2016 |
| Kardiokonsult AS | Sandefjord | 1990 |
| Kardiolog Skjetne AS | Levanger | 2020 |
| Kardiolog Zoran Radunovic AS | Oslo | 2020 |
| Kardiologi AS | Tønsberg | 2019 |
| Karen Kristoffersen Holding AS | Skien | 2020 |
| Karen Ueland AS | Oslo | 2023 |
| Karg AS | Fredrikstad | 2021 |
| Kari Bach Landro AS | Olsvik | 2005 |
| Kari Bach Landro Holding AS | Olsvik | 2005 |
| Kari E. Bjelland AS | Stavanger | 2012 |
| Kari Helene Bugge AS | Tønsberg | 2014 |
| Kari Nesse Tannlege AS | Skien | 2026 |
| Kari-Mette Stang-Hansen AS | Spydeberg | 2022 |
| Karin Fevaag Larsen AS | Trondheim | 2005 |
| Karin Holm Psykomotorisk Fysioterapi AS | Oslo | 2020 |
| Karin Hølland AS | Sandnes | 2007 |
| Karin Kosmetiske AS | Oslo | 2021 |
| Karin Rød AS | Sandefjord | 2011 |
| Karina Og Espen's Hjemmeservice Ans | Gjøvik | 2006 |
| Karius & Baktus AS | Fana | 2012 |
| Karius Holding AS | Geilo | 2009 |
| Karkirurgen AS | Hamar | 2016 |
| Karl Johan Øyeklinikk AS | Oslo | 2014 |
| Karl Johans Legesenter Da | Sarpsborg | 2023 |
| Karl K Andersen AS | Oslo | 1985 |
| Karl Martin Røed AS | Gressvik | 2019 |
| Karl Nordfalk AS | Oslo | 2016 |
| Karl Sivert Sunde AS | Røyken | 2007 |
| Karl-Ewerth Horneman AS | Oslo | 1987 |
| Karleif Taksdal AS | Sirevåg | 2022 |
| Karlsen Kiropraktikk Skodje Og Ørskog AS | Skodje | 2014 |
| Karlsen Urologi AS | Levanger | 2024 |
| Karlson Psykologene AS | Stavanger | 2016 |
| Karma Clinic AS | Steinkjer | 2023 |
| Karma Consulting AS | Heimdal | 2002 |
| Karma Omsorg AS | Tårnåsen | 2026 |
| Karmøy Hud & Fot AS | Sandve | 2018 |
| Karmøy Lege Og Helsetjeneste Kontor AS | Kopervik | 2023 |
| Karoline Einebrant Aspaas AS | Saltstraumen | 2025 |
| Karper AS | Vestre Gausdal | 2020 |
| Karrestad Legesenter Ans | Halden | 2003 |
| Karrestad Legesenter AS | Halden | 2022 |
| Karsberg Care AS | Hamar | 2025 |
| Kase Holding AS | Moss | 2005 |
| Kase-Berg AS | Moss | 2006 |
| Kasig AS | Holmestrand | 2023 |
| Kaspersen & Johansen AS | Oppegård | 2021 |
| Kastell Tannklinikk AS | Arendal | 2022 |
| Kaston AS | Hareid | 2020 |
| Kastvollen Rehabiliteringssenter AS | Inderøy | 2017 |
| Kasy AS | Oslo | 1970 |
| Katarzyna Karlsen AS | Rognan | 2022 |
| Kathrin Sørensen Sneve AS | Trondheim | 2021 |
| Kathrine's Fotterapiklinikk AS | Dokka | 2013 |
| Katle - Holding AS | Stavanger | 2021 |
| Katle Øre-Nese-Hals AS | Stavanger | 2021 |
| Katrin Kvideland AS | Øvre Ervik | 2014 |
| Katrine Bakke AS | Skien | 2021 |
| Katrine Børseth AS | Harstad | 2019 |
| Katrine Slettedahl AS | Skien | 2026 |
| Kattenberg Fysioterapi AS | Gol | 2013 |
| Kaur Holding AS | Lillestrøm | 2022 |
| Kausalhelse AS | Bodø | 2022 |