| 3G Holding AS | Professional & scientific | 2021 |
| 68 Grader Nord AS | | 2024 |
| A-R Invest AS | | 2025 |
| A/S Bulldozer Maskinlag | Construction | 1951 |
| A1 Trafikkskole AS | Education | 2013 |
| Aas Blomster AS | Wholesale & retail | 2022 |
| Abc El-Montasje AS | Construction | 2008 |
| Absteiro AS | Real estate | 2012 |
| Accountor Credit AS | Administrative & support | 1999 |
| Accountor Credit Group AS | Administrative & support | 2006 |
| Ade Invest AS | Real estate | 2025 |
| Adminor Eiendom AS | Real estate | 2016 |
| Advokatene Enoksen & Steiro AS | Professional & scientific | 2014 |
| Advokatfirmaet Wold AS | Professional & scientific | 2002 |
| Aei Invest AS | | 2026 |
| Agf Invest AS | | 2022 |
| Aggeroip AS | Professional & scientific | 2020 |
| Air 2021 AS | Transport & logistics | 2021 |
| Akkermann Commerce AS | Real estate | 2019 |
| Akkermann Eiendom AS | Real estate | 2021 |
| Akselsen Engineering AS | Wholesale & retail | 1988 |
| Aksjespareklubben Rik Da | | 2017 |
| Akta Eiendom AS | Real estate | 2000 |
| Akvakultur I Vesterålen AS | Arts & recreation | 2008 |
| Akvateam AS | Wholesale & retail | 2024 |
| Albrekt Consulting AS | Construction | 2025 |
| Albrigt Holding AS | | 2024 |
| Allsveis & Co Ans | Manufacturing | 1989 |
| Alm-Eiendom AS | Real estate | 1980 |
| Alsvåg AS | Manufacturing | 2002 |
| Alsvåg Eiendom AS | Real estate | 2021 |
| Alv B Steiro & Sønn AS | Real estate | 2022 |
| Am Ellingsen Invest AS | Real estate | 2017 |
| Amk - Eiendom AS | Real estate | 2010 |
| Anders Lian Fagerli AS | Wholesale & retail | 2015 |
| Andersen Scooter & Atv AS | Other services | 2012 |
| Andersengården Eiendom AS | Real estate | 1993 |
| Anderssen Invest AS | | 2025 |
| Andfjord Innovation AS | Professional & scientific | 2023 |
| Andorsen Consulting AS | Real estate | 2025 |
| Andreas Krug | Professional & scientific | 2008 |
| Andøya Lodge AS | Hospitality | 2025 |
| Anette AS | Agriculture & fishing | 2026 |
| Angells Næringsutvikling AS | Professional & scientific | 2002 |
| Anke Melchert | Construction | 2008 |
| Anre AS | Real estate | 2017 |
| Antonsen Eiendomsinvest AS | Real estate | 2023 |
| Antonsen T-Line AS | Transport & logistics | 1999 |
| Apartner AS | Professional & scientific | 2025 |
| Apartner Holding AS | | 2025 |
| Apas Eiendom AS | Real estate | 1979 |
| Apn Apartments AS | Real estate | 2018 |
| Apollo Hårsenter AS | Other services | 2016 |
| Apotekgården Sortland AS | Real estate | 2021 |
| Aqua Fall AS | Professional & scientific | 2022 |
| Arctic Blue AS | Wholesale & retail | 2002 |
| Arctic Blue Holding AS | Wholesale & retail | 2008 |
| Arctic North Adventures AS | Administrative & support | 2025 |
| Arctic Offshore Technologies AS | Professional & scientific | 2000 |
| Arctic Packaging AS | Wholesale & retail | 2021 |
| Arctic Sea Lodges AS | Real estate | 2021 |
| Arkitech AS | Information & communication | 2013 |
| Arktisk Kompetansesenter for Sau SA | Education | 2018 |
| Arne C. Ellingsen Invest AS | Financial services | 2005 |
| Arnes Bilutleie AS | Administrative & support | 1983 |
| Arntsen Auto AS | Other services | 2024 |
| Arnulf Olsen AS | Professional & scientific | 1991 |
| Aron Tvedt AS | Wholesale & retail | 2015 |
| Arons Vei 21 AS | Real estate | 2016 |
| Arrow Invest AS | Real estate | 2009 |
| Arvid Nyborg AS | Wholesale & retail | 2005 |
| AS Ellingsens Leiegårde | Real estate | 1930 |
| AS Odd Fellowgården | Real estate | 1959 |
| Asbjørn Selsbanesgate 24 AS | Real estate | 2021 |
| Ascon AS | Real estate | 1985 |
| Asoma Hanssen AS | Construction | 2016 |
| Aspe Holding AS | Education | 2023 |
| Assistanse Nor AS | Transport & logistics | 2010 |
| Assistanse Nor Lofoten AS | Transport & logistics | 2020 |
| Ast Anlegg AS | Professional & scientific | 2026 |
| Atle Mathiassen Eiendom AS | Real estate | 2005 |
| Audun Breines Media | Information & communication | 2013 |
| Austpollen Invest AS | Administrative & support | 2020 |
| Avenor Eiendom AS | | 1998 |
| Axe Data AS | Information & communication | 2004 |
| Axello Arbeid AS | Health & social care | 2021 |
| Axello AS | Health & social care | 1985 |
| Axello Marked AS | Health & social care | 2021 |
| B Martinsen Consult AS | Professional & scientific | 2016 |
| Bagorama Skibsgården Sortland AS | Wholesale & retail | 2016 |
| Baltic Bygg Nord AS | Construction | 2012 |
| Baluba Utelivsdrift AS | Hospitality | 2022 |
| Bankgata Invest AS | Real estate | 2006 |
| Barden AS | Real estate | 2018 |
| Bare Blå AS | Hospitality | 2020 |
| Bare Blå Drift AS | Hospitality | 2023 |
| Barkan AS | Real estate | 2022 |
| Barkestad Plastindustri AS | Manufacturing | 2021 |
| Bauunternehmen Florian Ostra GmbH & Co. KG | Construction | 2007 |
| BBN Invest AS | | 2021 |