| 1 Etg Leirvollen 1A AS | Real estate | 2016 |
| 222 Holding AS | Health & social care | 2023 |
| 2MINUTTER AS | Information & communication | 2023 |
| 2MINUTTER Studio AS | Information & communication | 2022 |
| 360 Flip AS | | 2024 |
| 9 Angels Holding AS | Financial services | 2020 |
| A Klinikken AS | Health & social care | 2020 |
| A Lande Invest AS | Real estate | 2021 |
| A Larsen Invest AS | Professional & scientific | 2007 |
| A-Form AS | Manufacturing | 2013 |
| A.G Holding AS | Construction | 2022 |
| A.G Utvikling AS | Construction | 2014 |
| A.G.O Holding AS | Construction | 2020 |
| A.S Invest AS | Financial services | 2005 |
| Aagedal Holding AS | | 2019 |
| Aap AS | Real estate | 2018 |
| Aap Eiendom AS | Real estate | 2026 |
| AB Drift AS | Construction | 2025 |
| AB Teleservice AS | Information & communication | 2004 |
| Abaldo Da | Administrative & support | 2000 |
| Adb-Senteret AS | Professional & scientific | 1986 |
| Advokatfirmaet Jakobsen AS | Professional & scientific | 2023 |
| Aej Eiendom AS | Real estate | 2016 |
| Af LM & TT Ans | Construction | 2025 |
| Afb Invest AS | Professional & scientific | 2015 |
| Agder Anlegg AS | Construction | 1994 |
| Agder Bad AS | Real estate | 2025 |
| Agder Bokholderi AS | Professional & scientific | 1989 |
| Agder Bolig AS | Real estate | 2016 |
| Agder Bolig Gruppen AS | Real estate | 2016 |
| Agder Boligbygging AS | Construction | 2017 |
| Agder Brannvern AS | Professional & scientific | 2019 |
| Agder Marine AS | Construction | 1995 |
| Agder Prosess Automasjon AS | Manufacturing | 2019 |
| Agder Regnskap AS | Professional & scientific | 2006 |
| Agder Rådgiving AS | Professional & scientific | 2021 |
| Agder Transport Og Anlegg AS | Transport & logistics | 2025 |
| Agderfjell AS | Manufacturing | 1994 |
| Agdermalerservice AS | Construction | 2023 |
| Agemo Holding AS | | 2005 |
| Agti Anlegg AS | Real estate | 2022 |
| Agti Holding AS | Real estate | 2022 |
| AH39 Eiendom AS | Real estate | 2020 |
| Aidit AS | Information & communication | 2026 |
| Aither AS | Information & communication | 2021 |
| Ajbas AS | Administrative & support | 1996 |
| Ajour Regnskap Mandal AS | Professional & scientific | 2004 |
| Aksaa Holding AS | Manufacturing | 2018 |
| Aktiv Hundetrim Da | Agriculture & fishing | 1997 |
| Aktivfot Drift AS | Health & social care | 2019 |
| Albert Malerfirma AS | Construction | 2022 |
| Alib AS | Manufacturing | 2019 |
| All-Tech AS | Wholesale & retail | 2015 |
| Allmenning AS | Real estate | 2026 |
| Aluweb AS | Information & communication | 2013 |
| Amaj Holding AS | Financial services | 2005 |
| Amaldus Eiendom Da | Real estate | 2002 |
| Ambiance Group AS | | 2025 |
| Ambiplants AS | Wholesale & retail | 2022 |
| Amigos Capital AS | | 2019 |
| Amjad AS | Wholesale & retail | 2017 |
| An Service AS | Administrative & support | 2023 |
| Anders Vetnes Holding AS | | 2019 |
| Anfield Finans AS | Real estate | 2020 |
| Ang Eiendom AS | Real estate | 2016 |
| Anlegg Sør AS | Construction | 2007 |
| Anne Rachel Fysioterapi AS | Health & social care | 2026 |
| Annies Salong AS | Other services | 2021 |
| ANNO95 AS | | 2019 |
| Ans Bene Elektro | Real estate | 1988 |
| Ans G-Sport Mandal | Wholesale & retail | 1989 |
| Appetite for Production AS | Arts & recreation | 2017 |
| Applica AS | Information & communication | 2003 |
| Applica Consulting AS | Information & communication | 1985 |
| Applica Group AS | Real estate | 1989 |
| Applica Robot Integration AS | Information & communication | 2017 |
| Applica Test & Certification AS | Professional & scientific | 2003 |
| Aqua Nordic AS | Administrative & support | 2026 |
| Ar Salg & Utleie AS | Wholesale & retail | 2014 |
| Archer Invest AS | | 2021 |
| Argumentexception AS | Information & communication | 2025 |
| Arm Invest AS | Financial services | 2013 |
| Armas Eiendom AS | Real estate | 2005 |
| Arme Råd AS | | 2021 |
| Arne Damman AS | Wholesale & retail | 2002 |
| Arne Gahre AS | Real estate | 2006 |
| Art Cafe AS | Real estate | 2017 |
| Arthur Berge AS | Wholesale & retail | 1964 |
| Arthur Robertsen Holding AS | | 2021 |
| Artistfoto Da | Arts & recreation | 2010 |
| Artkrystall Mandal AS | Arts & recreation | 2012 |
| AS Bårdsen Smie & Mek Verksted | Manufacturing | 1995 |
| AS Elektrisk Invest | Financial services | 2011 |
| AS Lande | Construction | 2013 |
| AS Lande Eiendomselskap | Real estate | 2021 |
| AS Lande Holding | Construction | 2021 |
| AS Musikkens Hus | Real estate | 1985 |
| AS Rym | Professional & scientific | 2018 |
| AS Sjølingstad Uldvarefabrik | Manufacturing | 1893 |
| Asbestsanering Bygg Sør AS | Construction | 2007 |