| Archer Norge AS | Mining & quarrying | 2007 |
| Archer Oiltools AS | Mining & quarrying | 1993 |
| Archer Well Machining AS | Manufacturing | 2014 |
| Archer Wellconnection AS | Manufacturing | 1988 |
| Arctic Spas Massasjebad AS | Wholesale & retail | 2007 |
| Arctic Spas Norge AS | Wholesale & retail | 2005 |
| Arctic Spiseri Avd. Sandnes AS | Hospitality | 2022 |
| ARCTIC2LAND Technology AS | Administrative & support | 2016 |
| Arctica Invest AS | Arts & recreation | 2018 |
| Areal Eiendom AS | Real estate | 2010 |
| Arena MC AS | Wholesale & retail | 2016 |
| Arenser AS | Professional & scientific | 2017 |
| Areyash Consultancy AS | | 2025 |
| Aria North AS | Professional & scientific | 2015 |
| Arild Skadsheim Invest AS | Wholesale & retail | 2017 |
| Arild Østbø Holding AS | | 2019 |
| Arilds Frisør AS | Other services | 2017 |
| Arkitekt Manuela Hardy AS | Professional & scientific | 2018 |
| Arkitektkontoret Vest AS | Professional & scientific | 1988 |
| Arkivet AS | Real estate | 2023 |
| Arktis Capital AS | Real estate | 2025 |
| Arlis AS | Financial services | 2018 |
| Arne Nese Holding AS | | 2022 |
| Arnes Kjøkken AS | Hospitality | 2016 |
| Arokuri Holding AS | Wholesale & retail | 2014 |
| Aros Arkitekter AS | Professional & scientific | 2013 |
| Aroy Thai AS | Hospitality | 2015 |
| Aroy Thai Holding AS | Hospitality | 2020 |
| Aroy Thai to AS | Hospitality | 2021 |
| Array AS | Real estate | 2019 |
| Arribatec Ea & BPM AS | Information & communication | 1994 |
| Artemis Avaton AS | | 2023 |
| Artificial Lift Excellence AS | Professional & scientific | 2018 |
| Artivo SP. Z.O.O. | Construction | 2022 |
| Artvision AS | Other services | 2025 |
| Arv Andås AS | | 2023 |
| Arva Investering AS | | 2022 |
| Arve Sele Kristensen AS | Wholesale & retail | 2021 |
| Arve Vådeland Maskin AS | Construction | 2016 |
| Arvid Invest AS | Real estate | 1998 |
| Arwe AS | | 2003 |
| AS A-Rep | Real estate | 1979 |
| AS Beauty by DB Sandnes | Other services | 2022 |
| AS Godtnok.Com | Professional & scientific | 2020 |
| AS Grønn-Utvikling | Real estate | 2015 |
| AS Kirkegt 10 | Real estate | 1983 |
| AS Nylund Consulting | Professional & scientific | 2023 |
| AS Shinshout.Com | Information & communication | 2021 |
| Asago AS | | 2021 |
| Asakil Holding AS | Real estate | 2012 |
| Asbjørn Klosters Gate 39 AS | Real estate | 2016 |
| Asco Trading AS | Real estate | 1984 |
| Asesor AS | Professional & scientific | 2007 |
| Asgard Renhold AS | Administrative & support | 2026 |
| Asheim Betongentreprenør AS | Construction | 2024 |
| Asheim Holding AS | Real estate | 2005 |
| Asit AS | Financial services | 2005 |
| Askeland Boligutleie AS | Real estate | 2024 |
| Askeland Byggmester AS | Construction | 2004 |
| Askeland Eiendomsutvikling AS | Real estate | 1997 |
| Askeland Holding AS | Education | 2019 |
| Askeland Inv AS | | 2020 |
| Askeland Trafikkskole AS | Education | 2019 |
| Askelandbrødrene Eiendom AS | Real estate | 2021 |
| Askelandbrødrene Holding AS | Real estate | 2020 |
| Aski Raski AS | Information & communication | 2006 |
| Askvik Holding AS | | 2021 |
| Asle Frantzen Holding AS | | 2026 |
| Asn Invest AS | Professional & scientific | 2022 |
| Aspides AS | Professional & scientific | 2003 |
| Aspøy Havbruk AS | Agriculture & fishing | 1997 |
| Asserson Blomster Da | Wholesale & retail | 2006 |
| Asserson Invest AS | | 2025 |
| Assetcare AS | Administrative & support | 2014 |
| Asterix Transport Og Service Da | Transport & logistics | 2019 |
| Ataman AS | Construction | 2014 |
| Atelier Boligstyling AS | Professional & scientific | 2025 |
| Atera AS | Professional & scientific | 2007 |
| Ateris AS | Manufacturing | 2026 |
| Atk AS | | 2022 |
| Atlantic 365 AS | | 2013 |
| Atle Teigen Holding AS | | 2018 |
| Atollo AS | Professional & scientific | 2025 |
| Atom Prosjekt AS | Professional & scientific | 2021 |
| Atom Travel AS | Transport & logistics | 2025 |
| Atp Holding AS | Real estate | 2016 |
| Atso AS | | 2022 |
| Attico AS | | 2020 |
| Attra Prosjekt 2 AS | Real estate | 2023 |
| Attvik Invest AS | Real estate | 2021 |
| Au Invest AS | Financial services | 2013 |
| Aud Karina Forsberg AS | Wholesale & retail | 2024 |
| Audentia Eiendom AS | Real estate | 2012 |
| Audentia Finans AS | | 2019 |
| Audun Holding AS | Financial services | 2012 |
| Auestad & Eide Eiendom Ans | Real estate | 2003 |
| Auestad.Net AS | Real estate | 2005 |
| Augestad Eiendom AS | Real estate | 2026 |
| Augus AS | Construction | 2021 |
| August Invest AS | | 1996 |