| Allergi Og Øre- Nese- Hals AS | Health & social care | 2013 |
| Alliance Property AS | Real estate | 2006 |
| Allinn AS | Education | 2012 |
| Allmenningen SA | Other services | 2014 |
| Alloka AS | Information & communication | 2026 |
| Allthegoodies AS | Real estate | 2007 |
| Allthems AS | | 2021 |
| Alma Mat AS | Wholesale & retail | 2021 |
| Almabjo AS | Other services | 2018 |
| Alo AS | Professional & scientific | 2023 |
| Alpen Holding AS | Real estate | 2005 |
| Alpha Chartering AS | Transport & logistics | 2005 |
| Alpha Sigma AS | Financial services | 2011 |
| Alphamed AS | Wholesale & retail | 2019 |
| Alrekstad Eiendom AS | Real estate | 2016 |
| Alt I Ett Selskapsservice Da | Hospitality | 1990 |
| Alt I Rør AS | Construction | 2024 |
| Altiene AS | | 2025 |
| Altifix AS | Construction | 2025 |
| Altk AS | | 2021 |
| Altona AS | Hospitality | 1923 |
| Altoren AS | Professional & scientific | 2026 |
| Aluf AS | Financial services | 2006 |
| Aluf Eiendom AS | Real estate | 2020 |
| Alumni Rabatt AS | Professional & scientific | 2013 |
| Alvda AS | | 2018 |
| Alvehaugen II AS | Real estate | 2005 |
| Alver Bolig 2 AS | Real estate | 2020 |
| Alver Bolig AS | Real estate | 2021 |
| Alver Bolig Utbygging AS | Real estate | 2016 |
| Alver Næringsbygg AS | Real estate | 2024 |
| Alvergruppen AS | Professional & scientific | 2014 |
| Alvøen Eiendommer AS | Real estate | 2013 |
| Alvøen Eiendommer Holding AS | Real estate | 2013 |
| Always Holding on AS | Real estate | 2021 |
| Alwaysonlab AS | Professional & scientific | 2012 |
| Alwo Invest AS | | 2024 |
| Alyse AS | Information & communication | 2026 |
| Amalie Jensen Tolo AS | Arts & recreation | 2025 |
| Amarantos AS | Real estate | 2005 |
| Amateur AS | | 2025 |
| Amber Line AS | Other services | 2014 |
| Ambrosia Eiendom AS | Real estate | 2013 |
| Amedia Annonse Vest AS | Professional & scientific | 2011 |
| Americano Capital AS | | 2025 |
| Amesto Accounthouse Bergen AS | Professional & scientific | 2024 |
| Amesto Accounthouse Vest Holding AS | Professional & scientific | 2025 |
| Amf AS | Hospitality | 2020 |
| Amfjell Invest AS | Financial services | 2014 |
| Amg Property AS | Financial services | 2002 |
| Amiche AS | Hospitality | 2010 |
| Amici Miei AS | Hospitality | 2015 |
| Amies AS | Other services | 2023 |
| Amigo Holding AS | Financial services | 2015 |
| Amirah AS | Hospitality | 2021 |
| Amistreetart AS | Wholesale & retail | 2022 |
| Amp 11 Advisors AS | Professional & scientific | 2023 |
| Amp 11 Management AS | | 2020 |
| Amp Eleven AS | | 2020 |
| Amp Eleven II AS | Information & communication | 2022 |
| Amtech AS | | 2017 |
| Amtek AS | Professional & scientific | 2020 |
| Ana-Kata Animasjon Da | Manufacturing | 2003 |
| Anan AS | Real estate | 2024 |
| Anaqua Foreign Filing AS | Information & communication | 2009 |
| And AS | Professional & scientific | 2025 |
| And Friends AS | Professional & scientific | 2024 |
| Andco AS | Information & communication | 2021 |
| Anders Berg Design AS | Professional & scientific | 2019 |
| Anders Haugarvoll AS | | 2024 |
| Anders O Grevstad Tekniske AS | Real estate | 2005 |
| Anders Waage Nilsen AS | | 2005 |
| Andersenentusiasme AS | | 2024 |
| Andora AS | Real estate | 2009 |
| Andre Birkeland Holding AS | | 2021 |
| Andrea Birkeland AS | | 2025 |
| Andreas Dolk AS | Arts & recreation | 2019 |
| Andreas Ludvigsen Holding AS | Real estate | 2020 |
| Andreas Sundal Holding AS | Real estate | 2001 |
| Andro Eiendom AS | Real estate | 2017 |
| Andromeda Eiendom AS | Real estate | 2004 |
| Andy Byggservice AS | Construction | 2018 |
| Andz Holding AS | | 2014 |
| Anekdote AS | Professional & scientific | 2023 |
| Anell Eiendom AS | Real estate | 2000 |
| Anendotos AS | | 2023 |
| Anestesi Service AS | Health & social care | 2015 |
| Anette Holding AS | | 2008 |
| Anette Pukerud AS | Health & social care | 2021 |
| Anetti AS | Wholesale & retail | 2022 |
| Angel Invest AS | | 2025 |
| Angelin AS | Real estate | 2014 |
| Angerman AS | Information & communication | 1997 |
| Angerman Hus AS | Real estate | 2006 |
| Angry Bite AS | Wholesale & retail | 2018 |
| Anjak AS | Real estate | 2010 |
| Ankris AS | Real estate | 2003 |
| Anna & Morf AS | Information & communication | 2020 |
| Anne Jensen Holding AS | | 2022 |
| Annho AS | | 2021 |