| Arctic Falcon Aviation Consulting AS | Professional & scientific | 2023 |
| Arctic IP Investment AS | Wholesale & retail | 2014 |
| Arctic Lobster Ans | Wholesale & retail | 2001 |
| Arctic Maritim AS | Manufacturing | 2017 |
| Arctic Motor AS | Other services | 2003 |
| Arctic Mustard AS | Manufacturing | 2014 |
| Arctic Natural Nutrition AS | Manufacturing | 2021 |
| Arctic Nova AS | Administrative & support | 2021 |
| Arctic Nova Holding AS | Administrative & support | 2023 |
| Arctic Pioneers AS | Professional & scientific | 2006 |
| Arctic Rib Event AS | Arts & recreation | 2003 |
| Arctic Stillas AS | Administrative & support | 2026 |
| Arctic Tales AS | Information & communication | 2025 |
| Arctiq Solutions AS | | 2025 |
| Areal Byggservice AS | Construction | 2011 |
| Areal-Gruppen AS | Construction | 2012 |
| Aresa Holding AS | | 2019 |
| Argus Bodø AS | Information & communication | 2006 |
| Argus Miljø AS | Professional & scientific | 2000 |
| Argusfisk AS | Agriculture & fishing | 2024 |
| Arild Skipnes AS | Agriculture & fishing | 2024 |
| Ariva Invest AS | | 2017 |
| Arizon AS | Wholesale & retail | 2002 |
| Arkaden Fauske AS | Real estate | 2021 |
| Arkaden Servering AS | Hospitality | 2000 |
| Arkitekt Even Aursand AS | Professional & scientific | 2013 |
| Arktisk Filharmoni AS | Arts & recreation | 2009 |
| Arktisk Film Norge Invest AS | Information & communication | 2012 |
| Armoja AS | Health & social care | 2022 |
| Arne Hoff AS | Real estate | 1982 |
| Arntfish AS | Agriculture & fishing | 2022 |
| Arnulf Bendixen Invest AS | Financial services | 2005 |
| Arol Eiendom AS | Real estate | 2024 |
| Art Cake AS | Manufacturing | 2022 |
| Art Maler AS | Construction | 2019 |
| Artmann AS | Construction | 2021 |
| Arva AS | Energy | 1997 |
| Arvid Bendixen AS | Construction | 1998 |
| AS Bodø Interiør | Real estate | 1988 |
| AS Industribygg | Real estate | 1960 |
| AS Meløyvær | Real estate | 1976 |
| AS Westfjordfish | Wholesale & retail | 1989 |
| Asak Nord AS | Manufacturing | 2020 |
| Asia-Marked AS | Wholesale & retail | 2018 |
| Ask Aakre Holding AS | | 2021 |
| Asker Prosjekt AS | Real estate | 2015 |
| Askmann Holding AS | Real estate | 2016 |
| Aspmyra AS | Real estate | 2006 |
| Aspmyra Fysioterapi AS | Real estate | 2012 |
| Aspmyra Næringsbygg AS | Real estate | 2000 |
| Assistia AS | Administrative & support | 2025 |
| Astrobotic Norway AS | Information & communication | 2025 |
| Atlantis Design AS | Professional & scientific | 2025 |
| Audiovisuell Distribusjon Bodø AS | Wholesale & retail | 2002 |
| August Eiendom AS | Real estate | 2020 |
| Aunmo Invest AS | | 2025 |
| Aurinko AS | Transport & logistics | 2010 |
| Auto & Dekkservice AS | Other services | 1995 |
| Auto 8-8 Imaas AS | Wholesale & retail | 1983 |
| Auto Og Bilpleie Bodø AS | Other services | 2018 |
| Auto Parts AS | Wholesale & retail | 2022 |
| Auto Parts Holding AS | Wholesale & retail | 2022 |
| Auto Team AS | Other services | 1993 |
| Auto Team Eiendom AS | Real estate | 2002 |
| Auto-Elektro AS | Other services | 2025 |
| Autoleie Nordland AS | Administrative & support | 2010 |
| Avfallsmegling Nord AS | Professional & scientific | 2020 |
| Avina Solutions AS | Information & communication | 2025 |
| Avisa Nordland AS | Information & communication | 2001 |
| Awesome Technologies AS | Information & communication | 2014 |
| B & J Bygg AS | Construction | 2020 |
| B Cool Street Wear Da | Wholesale & retail | 2003 |
| B Kristensen Holding AS | | 2021 |
| B&S Service AS | Administrative & support | 2018 |
| B-Manning AS | Administrative & support | 2022 |
| B. E. Taksering AS | Real estate | 2002 |
| B. Silberg Holding AS | | 2025 |
| B.E Pedersen AS | Transport & logistics | 2024 |
| B12 Digital Solutions AS | Information & communication | 2017 |
| Baade/Glimt FK AS | Education | 2023 |
| Babysharks Holding AS | | 2024 |
| Bad Music AS | Arts & recreation | 1998 |
| Baker Olsen Ans | Real estate | 1996 |
| Baker Olsen Stormyra AS | Hospitality | 2023 |
| Baker Olsen Trekanten AS | Wholesale & retail | 2008 |
| Bakkefjell Invest AS | Real estate | 2005 |
| Bakkejord AS | Health & social care | 2021 |
| Bakklund Holding AS | Agriculture & fishing | 2021 |
| Bakklund Mat Og Drikke AS | Hospitality | 2021 |
| Balera AS | Real estate | 2017 |
| Balkongen AS | Real estate | 2024 |
| Bamseveien Snekkerservice AS | Construction | 2024 |
| Bangkok AS | Hospitality | 2018 |
| Bark Ans | Wholesale & retail | 2001 |
| Barkåker T8 AS | Real estate | 2016 |
| Barnehagebrødet AS | Professional & scientific | 2013 |
| Baron AS | Professional & scientific | 2016 |
| Barth Eiendom AS | Health & social care | 2012 |
| Base Bedrift AS | Professional & scientific | 2012 |
| Baseline Invest AS | Real estate | 2019 |