| Arctic Cykling AS | Administrative & support | 2018 |
| Arctic Dream AS | Administrative & support | 2025 |
| Arctic Escape AS | Arts & recreation | 2015 |
| Arctic Explorer AS | Transport & logistics | 2014 |
| Arctic Explorers Norway AS | Administrative & support | 2021 |
| Arctic Farm AS | Administrative & support | 2018 |
| Arctic Film Equipment Ans | Administrative & support | 2010 |
| Arctic Food Lab AS | Hospitality | 2025 |
| Arctic Food Walk AS | Administrative & support | 2025 |
| Arctic Fox Tours AS | Arts & recreation | 2025 |
| Arctic Frontiers AS | Other services | 2019 |
| Arctic Fun AS | Administrative & support | 2025 |
| Arctic GM Experiences AS | Arts & recreation | 2024 |
| Arctic Green Aqua Farm AS | Agriculture & fishing | 2024 |
| Arctic Health Solutions AS | Professional & scientific | 2024 |
| Arctic Hospitality Invest AS | Real estate | 2022 |
| Arctic Husky AS | Arts & recreation | 2021 |
| Arctic Installasjon AS | Construction | 2006 |
| Arctic Investment Group AS | | 2022 |
| Arctic Kiwi Exchange AS | Education | 2024 |
| Arctic Live Seafood AS | Wholesale & retail | 2019 |
| Arctic Moments AS | Administrative & support | 2026 |
| Arctic Motor Tromsø AS | Other services | 2023 |
| Arctic Navigator AS | Arts & recreation | 2024 |
| Arctic Nightlife AS | Hospitality | 2020 |
| Arctic OMEGA-3 Norway AS | Wholesale & retail | 2019 |
| Arctic Overlanding Oü Nuf | Hospitality | 2025 |
| Arctic Passport AS | Administrative & support | 2026 |
| Arctic Pioner AS | Agriculture & fishing | 2015 |
| Arctic Polar Management AS | Agriculture & fishing | 1996 |
| Arctic Pride AS | Arts & recreation | 2018 |
| Arctic Pro Shop AS | Wholesale & retail | 2018 |
| Arctic Pulse AS | Administrative & support | 2017 |
| Arctic Retreat AS | Hospitality | 2024 |
| Arctic Safari AS | Financial services | 2005 |
| Arctic Safe Travel AS | Education | 2025 |
| Arctic Sea Adventures AS | Administrative & support | 2025 |
| Arctic Sea Cruise Invest AS | Real estate | 2017 |
| Arctic Sea Invest AS | Professional & scientific | 2015 |
| Arctic Seafood Norway Tromsø Da | Wholesale & retail | 2002 |
| Arctic Silence AS | Education | 2016 |
| Arctic Touring AS | Administrative & support | 2025 |
| Arctic Tours AS | Administrative & support | 2025 |
| Arctic Tours Tromso AS | Arts & recreation | 2022 |
| Arctic Travel & Leisure AS | Administrative & support | 2016 |
| Arctic Travel Experience AS | Real estate | 2019 |
| Arctic Trust Invest AS | Administrative & support | 2023 |
| Arctic V Consulting AS | Professional & scientific | 2024 |
| Arctic Vision AS | | 2024 |
| Arctic Waste Management AS | Water & waste | 2014 |
| Arctic Westie Fest AS | Administrative & support | 2026 |
| Arctic Wild Tours AS | Administrative & support | 2024 |
| ARCTIC-365 AS | Administrative & support | 2010 |
| Arctic-Innovation AS | Real estate | 2020 |
| Arctic-Service AS | Wholesale & retail | 1988 |
| Arctica Expeditions AS | Transport & logistics | 2011 |
| Arcticzymes AS | Manufacturing | 2009 |
| Arcticzymes Technologies ASA | Manufacturing | 1990 |
| Areal Signatur AS | Real estate | 2026 |
| Argu AS | Real estate | 2002 |
| Arkitektkontoret Amundsen AS | Professional & scientific | 2011 |
| Arktisk Film Norge AS | Information & communication | 1980 |
| Arktisk Marin AS | Administrative & support | 1989 |
| Arlen AS | Health & social care | 2012 |
| Arnesen Eiendom AS | Real estate | 1975 |
| Arnesen Stormarkeder AS | Wholesale & retail | 1979 |
| Arnestedet Eiendom AS | Real estate | 1972 |
| Arnestedet Næringseiendom AS | Real estate | 2020 |
| Arnet Invest AS | Professional & scientific | 2011 |
| Aro Multiservice AS | Administrative & support | 2021 |
| Aromatic Ooze Da | Arts & recreation | 2021 |
| Aronsen Invest AS | | 2017 |
| Aronsenmonsen Invest AS | Professional & scientific | 1988 |
| Art and Green Eie AS | Real estate | 2026 |
| Arth Mack AS | Real estate | 1999 |
| Artic Aurora Tromsø AS | Administrative & support | 2026 |
| Artic Transport AS | Transport & logistics | 2026 |
| Artisten Musikkformidling Ans | Administrative & support | 1997 |
| Arvadus AS | Professional & scientific | 2021 |
| Arvento Invest AS | | 2025 |
| Arvto AS | Real estate | 2022 |
| AS Afin | Real estate | 1969 |
| AS Bilco | Wholesale & retail | 1985 |
| AS H.Mikkelsen | Construction | 2021 |
| AS Jøvik Sildolje & Kraftforfabrik | Real estate | 1913 |
| AS Multisystemer | Real estate | 1978 |
| AS Myreng Borettslag | Households | 1958 |
| AS Norrøna Barnehage | Education | 1987 |
| AS Norsk Fagskole | Education | 1998 |
| AS Polarleie | Real estate | 1988 |
| AS Slepebåtene | Transport & logistics | 1988 |
| AS Storgaten 118 | Real estate | 1971 |
| AS Strandgaten 26 | Real estate | 1985 |
| AS Søndre Tollbugate 4 | Real estate | 1969 |
| AS Taras | Wholesale & retail | 1987 |
| AS Toril Hanson Investering | Real estate | 2019 |
| AS Tromsø Automobilcompani - AS Taco | Real estate | 1939 |
| AS Tromsø Bunkerdepot | Real estate | 1930 |
| Aser Raina AS | Education | 2024 |
| Asg 3 AS | Real estate | 2021 |