| Amundsen Spesial Sørlandssenteret AS | Wholesale & retail | 2016 |
| Anapta Forlag AS | Information & communication | 2009 |
| Anastacia AS | Wholesale & retail | 1996 |
| Anbor AS | Health & social care | 2022 |
| Anders Mol Invest AS | | 2022 |
| Andersen Elite Coaching AS | Real estate | 2013 |
| Andersen Tak AS | Construction | 2008 |
| Andersen Tjenester AS | Professional & scientific | 2006 |
| Andersen Transport AS | Transport & logistics | 2003 |
| Andersen Ved- Og Brøyteservice Ans | Agriculture & fishing | 2004 |
| Andersen Ventures AS | Education | 2023 |
| Andersen Yachting AS | Transport & logistics | 2024 |
| Andersen's Consult AS | Professional & scientific | 2010 |
| Andeskjær Invest AS | Real estate | 2018 |
| Andreas Erland Bygg AS | Construction | 2017 |
| Andreas Erland Holding AS | Construction | 2021 |
| Andreas Kjærsvei 37 AS | Real estate | 2013 |
| Andreas Lindblom Invest AS | | 2022 |
| Andreas S Stray Holding AS | Real estate | 1999 |
| Andrè Pedersen Holding AS | Wholesale & retail | 2023 |
| Andungen Barnehage SA | Education | 1992 |
| Andve Holding AS | Real estate | 2006 |
| Andås Begravelsesbyrå AS | Other services | 2019 |
| Andås-Eiendom AS | Real estate | 2022 |
| Andøen AS | Real estate | 1995 |
| Andøya Båthavn Ba | Transport & logistics | 1992 |
| Andøya Industripark AS | Real estate | 1985 |
| Andøya Legesenter AS | Health & social care | 2021 |
| Andøya Park AS | Real estate | 2020 |
| Andøyfaret Eiendom AS | Real estate | 2004 |
| Ane Lohne AS | Other services | 2026 |
| Aneta Lighting AS | Health & social care | 1989 |
| Anette Høyåsen AS | Other services | 2023 |
| Ank Invest AS | | 2018 |
| Anker Dykkerselskap Da | Construction | 1989 |
| Ankerfestet Holding AS | | 2024 |
| Ankers Invest AS | Real estate | 2006 |
| Anlegg & Naturstein AS | Administrative & support | 2018 |
| Anleggspartner Sør AS | Construction | 2008 |
| Anne Margrethes Frisørsalong AS | Other services | 2002 |
| Annh AS | Financial services | 2005 |
| Anr Holding AS | | 2020 |
| Ans Bråvannslkeiva 1 | Real estate | 1988 |
| ANS FANTASIA BARN Elin og Øivind Aadnevik | Wholesale & retail | 1989 |
| Ans Olav Trygvassonsvei 4 | Real estate | 1990 |
| Ans Reinhartsen & Co | Real estate | 1958 |
| Ansgar Bibelskole AS | Education | 2005 |
| Ansgar Drift Og Eiendom AS | Real estate | 2005 |
| Ansgar Høyskole AS | Education | 2005 |
| Ansgar Sommerhotell Og Konferansesenter AS | Hospitality | 1988 |
| Ansgarskolen AS | Education | 2005 |
| Ansor AS | Financial services | 2016 |
| Antec Invest AS | | 2005 |
| Antevski AS | Wholesale & retail | 2020 |
| Antholz Invest AS | Professional & scientific | 2018 |
| Antholz Startup 1 AS | | 2020 |
| Anthony AS | Professional & scientific | 2010 |
| Antikvariat Sør AS | Wholesale & retail | 2019 |
| Antirust Vågsbygd AS | Other services | 2015 |
| Antisink AS | Professional & scientific | 2017 |
| Antisink Drone AS | Professional & scientific | 2022 |
| Ao Eiendom AS | Wholesale & retail | 2006 |
| Aog AS | Professional & scientific | 2017 |
| Aoga AS | Professional & scientific | 2024 |
| Ap Invest Sør AS | Real estate | 2018 |
| Apaxa AS | Professional & scientific | 2019 |
| Apex Dental AS | Health & social care | 2009 |
| Apex Safety AS | | 2026 |
| Aplex AS | | 2025 |
| Apollo Hair Clinic AS | Other services | 2001 |
| Apollos AS | Professional & scientific | 2002 |
| Apotek 1 Dvergsnes AS | Wholesale & retail | 2021 |
| Apotek Søm AS | Wholesale & retail | 2021 |
| Applica Training Systems AS | Information & communication | 2003 |
| Apputvikling AS | Information & communication | 2021 |
| Aptis AS | Professional & scientific | 2024 |
| Aptum & Webcode Holding AS | Professional & scientific | 2018 |
| Aptum AS | Professional & scientific | 2015 |
| Aq Hotelleiendom AS | Real estate | 2010 |
| Aq Næring AS | Real estate | 2010 |
| Aq Parkering AS | Transport & logistics | 2010 |
| Aqua Health AS | Professional & scientific | 2015 |
| Aqua Rare Metals AS | Mining & quarrying | 2025 |
| Aquarama Badedrift AS | Arts & recreation | 2010 |
| Aquarama Kristiansand AS | Real estate | 2008 |
| Aquarama Service AS | Arts & recreation | 2010 |
| Aquarama Velvære AS | Other services | 2010 |
| Aquasolis Global AS | Manufacturing | 2017 |
| Aquatech Holding AS | Professional & scientific | 2014 |
| Ar Investment AS | Financial services | 2016 |
| Arbeid Med Ord Da | Education | 1994 |
| Arbeid Med Ord Læremidler AS | Information & communication | 1994 |
| Arbeidshelt AS | Wholesale & retail | 2023 |
| Arcade Riots AS | Information & communication | 2012 |
| Arctic Marine Furniture AS | Manufacturing | 2023 |
| Arctic Media AS | Information & communication | 2013 |
| Arctic Serv AS | Wholesale & retail | 2025 |
| Arctic Windows AS | Professional & scientific | 2020 |
| Arena Sportsbar AS | Hospitality | 2025 |
| Arholding AS | | 2018 |