| HLC Eiendom AS | Real estate | 2019 |
| Holmeslet Eiendom AS | Real estate | 2016 |
| Horizons Holding AS | | 2024 |
| Hovedkontor AS | Information & communication | 2013 |
| HSB AS | Construction | 2019 |
| Hummelsund Maritim AS | Transport & logistics | 2017 |
| Hurin Holding AS | Professional & scientific | 2022 |
| HV Trafikkskole AS | Education | 2026 |
| Ib-Jo Invest AS | Professional & scientific | 2021 |
| Icet AS | | 2019 |
| Imes AS | Manufacturing | 1981 |
| Industrikulde AS | Construction | 2018 |
| Infront Utvikling AS | Real estate | 2019 |
| Integral Bygg AS | Construction | 2018 |
| Integral Eiendom AS | Real estate | 2021 |
| Integral Holding AS | Real estate | 2013 |
| Irj Takst AS | Professional & scientific | 2023 |
| Ishavsmat AS | Wholesale & retail | 2025 |
| Issa Frisør AS | Other services | 2022 |
| Itsumi AS | Hospitality | 2021 |
| Iversen Kystfiske AS | Agriculture & fishing | 2020 |
| Institutt For Datasikkerhet AS | Information & communication | 1986 |
| Jack R Jensen AS | | 2023 |
| Jan Invest AS | Professional & scientific | 2021 |
| Jannova AS | Real estate | 2012 |
| Jannova Holding AS | Real estate | 2021 |
| JG Bygg AS | Construction | 2019 |
| Johansen Eiendomsinvest AS | Real estate | 2005 |
| John AS | Agriculture & fishing | 2015 |
| Jony Solvang AS | Agriculture & fishing | 2012 |
| JPG AS | Construction | 2016 |
| JS Tromsø AS | | 2018 |
| JTN AS | | 2016 |
| Jørgensen Investment AS | Real estate | 2017 |
| K Investum AS | | 2024 |
| Kaboom Holding AS | | 2023 |
| Kae Drift AS | Construction | 2023 |
| Kanebogen Gull Og Ur AS | Wholesale & retail | 1988 |
| Kant Utvikling AS | Real estate | 2020 |
| Karelius Holding AS | | 2026 |
| Karlsen Maskin Og Eiendom AS | Administrative & support | 2025 |
| Karlsens Elektro AS | Construction | 1998 |
| KB Eiendom & Utleie AS | Real estate | 2024 |
| KBN AS | Arts & recreation | 2013 |
| Ker AS | Real estate | 2021 |
| Kevi Pro Da | Information & communication | 1996 |
| Kifør AS | Real estate | 2021 |
| Kirkeholmen Eiendom AS | | 2000 |
| Kiss the Tattoo Da | Arts & recreation | 2018 |
| KJB Invest AS | Professional & scientific | 2011 |
| Kjeldsen Invest AS | Wholesale & retail | 2005 |
| Kjæreng Gård AS | Arts & recreation | 2006 |
| Kmoe Invest AS | | 2023 |
| Kna AS | Health & social care | 2002 |
| Kom I Form Tromsø AS | Arts & recreation | 1992 |
| Komplett Bygg Og Eiendom AS | Construction | 2020 |
| Komplett Regnskap Tromsø AS | Professional & scientific | 2014 |
| Kon AS | Information & communication | 1998 |
| Konsularnt AS | | 2019 |
| Kotsin AS | | 2023 |
| Krika AS | Real estate | 2021 |
| Krysspress AS | Professional & scientific | 2008 |
| KSV 2A AS | Real estate | 2022 |
| Köhlers Sveis & Anleggsservice AS | Manufacturing | 2014 |
| Lidin Film AS | Information & communication | 2024 |
| Lindberg Logistikk AS | Wholesale & retail | 2013 |
| Litteraturvinsjen AS | Other services | 2016 |
| Lodbukt Holding AS | Information & communication | 2024 |
| Lundgroup AS | | 2020 |
| Lydersen Holding AS | Construction | 2021 |
| Lykken I Nord AS | Wholesale & retail | 2020 |
| Løseth AS | Administrative & support | 2020 |
| Maais AS | | 2019 |
| Magpower Ans | Wholesale & retail | 2001 |
| Magrathea AS | Real estate | 2021 |
| Mai Invest AS | Real estate | 2001 |
| Maib Invest AS | | 2018 |
| Main Biotechnology AS | Professional & scientific | 2014 |
| Mallorcatur.No AS | Administrative & support | 2012 |
| Matsson Invest AS | Real estate | 2022 |
| MBN AS | | 2013 |
| Mel Tromsø 1 AS | Real estate | 2023 |
| Mel Tromsø 11 AS | Real estate | 2023 |
| Mel Vestby 11 AS | Real estate | 2022 |
| Miamia Invest AS | Financial services | 2003 |
| Midnattssol AS | | 2022 |
| Midnight Sun Mountain Guides Troms AS | Administrative & support | 2025 |
| Mikkelsen Eksport AS | Wholesale & retail | 2007 |
| Miningtech AS | Wholesale & retail | 2021 |
| Mlkirkvik Holding AS | | 2025 |
| MM Multiservice AS | Construction | 2026 |
| Mm-Salongen AS | Other services | 1992 |
| Mony Regnskap AS | Professional & scientific | 2019 |
| Morjo AS | Real estate | 2021 |
| Mormar AS | Real estate | 2021 |
| Movemotion AS | Information & communication | 2021 |
| Myrvegen Familiebarnehage AS | Education | 2017 |
| Myrveien 22 AS | Real estate | 1969 |
| Natalie Holding AS | Administrative & support | 2022 |
| Naturguiden AS | Administrative & support | 2024 |