| Alfheim Familiebarnehage Da | Education | 2011 |
| Alfheim Stadion II AS | Real estate | 1989 |
| Alfheimpizza AS | Hospitality | 2010 |
| Alga Carbon Capture AS | Water & waste | 2026 |
| Alke Investeringer AS | | 2025 |
| Alkevegen 9 B-E AS | Real estate | 2019 |
| Allgruppen AS | Real estate | 2015 |
| Alliance Takst AS | Professional & scientific | 2022 |
| Allsidig Invest AS | Administrative & support | 2015 |
| Allsidig Rørleggertjeneste AS | Construction | 2011 |
| Allsidig Snekkertjeneste AS | Construction | 2014 |
| Allsidig Vaktmester AS | Administrative & support | 2009 |
| Alo Invest AS | Real estate | 2006 |
| Alomakeriet AS | Professional & scientific | 2019 |
| Alone Nord AS | Professional & scientific | 2025 |
| Alpha & Omega AS | Transport & logistics | 2024 |
| Alpha Nord AS | Professional & scientific | 1974 |
| Alpha Nord Konsern AS | Professional & scientific | 2023 |
| Alpi Eiendom AS | Real estate | 2000 |
| Alskog Consult AS | Professional & scientific | 2022 |
| Alsvik AS | Construction | 2019 |
| Alt Regnskap AS | Professional & scientific | 2013 |
| Altera Holding AS | Real estate | 2017 |
| Alti Eie AS | Real estate | 2016 |
| Alti Elektro AS | Construction | 2012 |
| Alunord Alumiinium Oü Nuf | Manufacturing | 2026 |
| Amarine AS | Arts & recreation | 2013 |
| Amazing Aurora AS | Administrative & support | 2018 |
| Amcons AS | Professional & scientific | 2023 |
| Amd Group AS | Professional & scientific | 2025 |
| Amd Langnes AS | Transport & logistics | 2016 |
| Ami Hotel AS | Hospitality | 2005 |
| Amity Net AS | Information & communication | 2025 |
| Amjo Holding AS | Health & social care | 1995 |
| Ampa Holding AS | | 2021 |
| Ampstek Norway AS | Information & communication | 2026 |
| Amtmandens AS | Hospitality | 2017 |
| Amtmann Holding AS | | 2020 |
| Anco AS | Real estate | 2010 |
| Anco Eiendom AS | Real estate | 2021 |
| Anco Partner AS | Real estate | 1989 |
| Andbo Ans | | 1993 |
| Andengs Holding AS | | 2026 |
| Anders Andre 2 AS | Real estate | 2023 |
| Andersen Elektro Tromsø AS | Construction | 2020 |
| Andersen Konsulting AS | Professional & scientific | 2017 |
| Andersen Media Og Musikk AS | Information & communication | 2025 |
| Andreas Harnang AS | Health & social care | 2022 |
| Andreas Myrstad AS | Wholesale & retail | 2022 |
| Andreassen & Co AS | Other services | 2021 |
| Andrejenssen.No Glass Og Fasade AS | Wholesale & retail | 2021 |
| Andresen Vaapenforretning AS | Wholesale & retail | 1987 |
| Anla Eiendom AS | Real estate | 2023 |
| Ann Ramona AS | Professional & scientific | 2006 |
| Anne & Nils Opsahl AS | Information & communication | 2021 |
| Anne Kjæreng AS | Health & social care | 2002 |
| Anne Nymo Trulsen AS | Arts & recreation | 2026 |
| Annexstad Holding AS | Real estate | 2022 |
| Anrs Holding AS | | 2024 |
| Ans Loegården | Real estate | 1982 |
| Ans Skattøraveien 54 | | 1989 |
| Anslag AS | Professional & scientific | 2024 |
| Antek Eiendom AS | Real estate | 2001 |
| Anton Iversens Vei 7 - 9 - 11 AS | Households | 1952 |
| Antonsenx AS | Administrative & support | 2026 |
| Antv Eiendom AS | Hospitality | 2025 |
| Anupa AS | Professional & scientific | 2007 |
| Apa Invest AS | Financial services | 2011 |
| Aph AS | Hospitality | 2014 |
| Appelbom Invest AS | | 2017 |
| Aquarius Invest Inc | | 2006 |
| Aquatica AS | Wholesale & retail | 2006 |
| Arato AS | Real estate | 2023 |
| Arceo Holding AS | Real estate | 2023 |
| Architecture & Design Vilmar Vuoristo AS | Professional & scientific | 2024 |
| Arcos AS | Education | 2011 |
| Arcos Eiendom AS | Real estate | 2016 |
| Arcos Holding AS | Real estate | 2020 |
| Arctic Action AS | Information & communication | 2012 |
| Arctic Aesthetic AS | Other services | 2023 |
| Arctic Alliance Holding AS | | 2024 |
| Arctic Aurora Tours AS | Arts & recreation | 2025 |
| Arctic Beauty AS | Wholesale & retail | 2017 |
| Arctic Biodiscovery Holding AS | | 2025 |
| Arctic Bonds AS | Administrative & support | 2020 |
| Arctic Breeze AS | Administrative & support | 1998 |
| Arctic Builders AS | Real estate | 2012 |
| Arctic Camp Brattli AS | Administrative & support | 2019 |
| Arctic Candy AS | Manufacturing | 2005 |
| Arctic Center AS | Hospitality | 1984 |
| Arctic Circle Capital AS | | 2023 |
| Arctic Circle Consulting AS | Professional & scientific | 2020 |
| Arctic Circle Equity 1 AS | | 2026 |
| Arctic Circle Equity AS | | 2025 |
| Arctic Circle Equity Investors AS | | 2026 |
| Arctic Circle Hotels AS | | 2025 |
| Arctic Circle Invest 1 AS | | 2026 |
| Arctic Circle Property AS | Real estate | 2021 |
| Arctic Crown AS | Wholesale & retail | 2024 |
| Arctic Cruise in Norway AS | Transport & logistics | 2014 |