| Asian Healty Foods AS | Hospitality | 2015 |
| Asian House AS | Hospitality | 2018 |
| Ask Undervisning AS | Information & communication | 2015 |
| Asket AS | Transport & logistics | 2005 |
| Aslak Holms Sønner AS | Information & communication | 2015 |
| Aslav AS | | 2025 |
| Asora Da | Administrative & support | 2003 |
| Aspenes Invest AS | | 2026 |
| Aspility AS | Wholesale & retail | 2019 |
| Assuransepartnerne AS | Financial services | 2017 |
| Astrid P Holding AS | | 2024 |
| Astrids AS | Financial services | 2005 |
| Astro Eiendom AS | Real estate | 1997 |
| At Arkitektur AS | Professional & scientific | 2004 |
| Athend Holding AS | Financial services | 2012 |
| Atrium Gruppen AS | Real estate | 2024 |
| Atticus AS | Health & social care | 2016 |
| Auar Holding AS | | 2025 |
| Audionor AS | Arts & recreation | 1995 |
| Aune Gynekologi AS | Health & social care | 1996 |
| Aura Kapitals AS | | 2013 |
| Auris Bygg AS | Construction | 2020 |
| Aurona AS | Professional & scientific | 2026 |
| Aurora Alps AS | Administrative & support | 2012 |
| Aurora Borealis Mining Co. AS | Mining & quarrying | 2009 |
| Aurora Borealis Tromsø AS | Administrative & support | 2018 |
| Aurora Capital Tours Tromsø AS | Administrative & support | 2018 |
| Aurora Flow AS | Hospitality | 2025 |
| Aurora Kino AS | Information & communication | 2023 |
| Aurora Laughialis AS | Arts & recreation | 2025 |
| Aurora Rentals AS | Administrative & support | 2025 |
| Aurora Service AS | Education | 2020 |
| Aurora Tromsø Tours AS | Arts & recreation | 2025 |
| Austadkvartalet AS | Real estate | 2025 |
| Austadkvartalet Holding AS | Real estate | 2025 |
| Auto Nord AS | Wholesale & retail | 1985 |
| Autokrat Holding AS | Real estate | 2014 |
| Autoline Restore AS | Agriculture & fishing | 2015 |
| Autoregisteret AS | Other services | 2024 |
| Autospeed AS | Wholesale & retail | 2001 |
| Auxilia AS | Administrative & support | 2019 |
| Aventura Design AS | Professional & scientific | 2026 |
| Aventura Studio AS | Information & communication | 2018 |
| Avikom AS | Information & communication | 2025 |
| Avincis Aviation Engineering Norway AS | Transport & logistics | 2018 |
| Avincis Aviation Fleet Management Nordics AS | Administrative & support | 2011 |
| Avincis Aviation Holdings Norway AS | Health & social care | 2018 |
| Avincis Aviation Norway AS | Health & social care | 2015 |
| Avskjerming AS | Wholesale & retail | 2005 |
| Axira AS | Information & communication | 2021 |
| B & E Invest AS | Real estate | 2006 |
| B & R Nature for Generations AS | Real estate | 2017 |
| B&B Invest AS | Transport & logistics | 2005 |
| B.Eyesummit AS | | 2024 |
| B.Nøstvold Holding AS | | 2022 |
| Baard AS | Professional & scientific | 2023 |
| Baard CC AS | | 2023 |
| Baci Invest AS | Real estate | 2016 |
| Baco Bygg AS | Construction | 2016 |
| Baco Eiendom AS | Real estate | 2022 |
| Bah Holding AS | Real estate | 2020 |
| Bahnhof AB | Information & communication | 2007 |
| Bakehuset Nord-Norge AS | Manufacturing | 2002 |
| Bakehuset Nord-Norge Eiendom AS | Real estate | 1991 |
| Bakehuset Nord-Norge Holding AS | Manufacturing | 2010 |
| Bakeriet Steike Godt AS | Manufacturing | 2002 |
| Bakkeby Holding AS | Administrative & support | 2018 |
| Bakkevold Holding AS | | 2026 |
| Baks Eiendom AS | Real estate | 2005 |
| Baks Holding AS | Real estate | 2005 |
| Baks Management AS | Professional & scientific | 2024 |
| Bakseter Gård AS | Real estate | 2022 |
| Balanse I Livet AS | Health & social care | 2019 |
| Balsfjordgata 2 AS | Real estate | 1989 |
| Balthazar Invest AS | Financial services | 2005 |
| Baluba Holding AS | | 2018 |
| Bamsestua Friluftsbarnehage SA | Education | 1996 |
| Bankerått AS | Hospitality | 2019 |
| Bapp Eiendom AS | Real estate | 2018 |
| Bapp Holding AS | Hospitality | 2018 |
| Bardico AS | | 2020 |
| Bardu Camping & Turistsenter AS | Hospitality | 2007 |
| Bare Armod AS | | 2021 |
| Barents Elektronikk AS | Wholesale & retail | 2020 |
| Barents Holding AS | Construction | 2017 |
| Barents Medical Center AS | Health & social care | 2017 |
| Barentsterminalen AS | Transport & logistics | 2013 |
| Barlindhaug AS | Financial services | 1984 |
| Barlindhaug Eiendom AS | Real estate | 1993 |
| Barlindhaug Eiendom Tomteselskap AS | Real estate | 2021 |
| Barnehagen Hundre SA | Education | 2008 |
| Barrakuda Eiendom AS | Hospitality | 2009 |
| Barske Glæder Ans | | 1988 |
| Basecamp Tromsø AS | Other services | 2013 |
| Bataks AS | Real estate | 2014 |
| Bayer Holding AS | | 2022 |
| Bayer Invest AS | Real estate | 2014 |
| BB Gym Tromsø AS | Education | 2013 |
| BC Byggentreprise AS | Professional & scientific | 2013 |
| BCH Aktiva AS | | 2023 |