| 3-HUS AS | Real estate | 2018 |
| 3W Consult AS | Wholesale & retail | 2008 |
| 811 Invest AS | Financial services | 2006 |
| A Ottersland AS | Construction | 2026 |
| A R Experiences AS | Hospitality | 2023 |
| A-Tech Teltutleie AS | Administrative & support | 2015 |
| A.D.A. Marine Consult AS | Professional & scientific | 2025 |
| A.T.Christensen Holding AS | | 2021 |
| A1 Tannlegen Kellari AS | Health & social care | 2010 |
| A1 Tannlegen Kirkedam AS | Health & social care | 1997 |
| Aage Brekke AS | Wholesale & retail | 1980 |
| Aanonsen VVS AS | Construction | 2013 |
| Aasen Bil Og Eiendom AS | Real estate | 2021 |
| Aasen Eiendommer AS | Real estate | 2022 |
| AB Aagedal AS | Health & social care | 2014 |
| AB Transport Ans | Real estate | 1988 |
| Accountit AS | Professional & scientific | 2017 |
| Accountra Software AS | Information & communication | 1997 |
| Achilles Information AS | Information & communication | 1998 |
| Actieselskabet Kolbjørn | Transport & logistics | 1893 |
| Acura AS | Wholesale & retail | 2020 |
| Ad-Group AS | Construction | 1999 |
| Advokatfirma Haakstad & Co Da | Professional & scientific | 2009 |
| Advokatfirmaet Knutsen & Hoel Da | Professional & scientific | 2017 |
| Aeb Eiendominvest AS | Real estate | 1973 |
| Aet Eiendom Arendal AS | Real estate | 2002 |
| Aet Holding Arendal AS | Professional & scientific | 2005 |
| Aet Nord AS | Real estate | 2021 |
| Afk Ampwell AS | Professional & scientific | 2021 |
| Afk Eiendom AS | Real estate | 2008 |
| Afk Longum Invest AS | Real estate | 2022 |
| Afk Småkraft Holding AS | Energy | 2021 |
| Afk Tyskland Holding AS | Real estate | 2021 |
| Agder Agentur AS | Wholesale & retail | 2020 |
| Agder Auto AS | Wholesale & retail | 2011 |
| Agder Betong Entreprenør AS | Construction | 2018 |
| Agder Bolig Entreprenør AS | Information & communication | 2000 |
| Agder Dykk AS | Construction | 2020 |
| Agder Dyreklinikk AS | Professional & scientific | 2026 |
| Agder Dyreklinikk AS | Professional & scientific | 2011 |
| Agder Dyreklinikk Holding AS | | 2026 |
| Agder Eiendomsmegling AS | Real estate | 2018 |
| Agder El Installasjon Arendal AS | Construction | 2008 |
| Agder Entreprenør AS | Construction | 2025 |
| Agder Flistjenester AS | Construction | 2024 |
| Agder Forsikringssenter AS | Financial services | 2024 |
| Agder Gass AS | Wholesale & retail | 2022 |
| Agder Hjerteklinikk AS | Health & social care | 2009 |
| Agder Hud AS | Health & social care | 2019 |
| Agder Innovasjon AS | Education | 2015 |
| Agder Kulturakademi AS | Education | 2022 |
| Agder Lakk AS | Other services | 2012 |
| Agder Medisinske Senter AS | Health & social care | 2022 |
| Agder Mestermur AS | Construction | 2020 |
| Agder Mestermur Holding AS | Construction | 2022 |
| Agder Mur Og Flis AS | Construction | 2026 |
| Agder Prosjektutvikling AS | Real estate | 2016 |
| Agder Regnskapstjenester AS | Professional & scientific | 2011 |
| Agder Regnskapstjenester AS | Professional & scientific | 2011 |
| Agder Renovasjon Næring AS | Water & waste | 2005 |
| Agder Service Drift AS | Construction | 2025 |
| Agder Sikkerhet AS | Administrative & support | 2015 |
| Agder Sparebank | Financial services | 1884 |
| Agder Storbilskole AS | Education | 2005 |
| Agder Takst AS | Real estate | 2025 |
| Agder Tekniske Investeringer AS | Construction | 2022 |
| Agder Tilkomstteknikk AS | Professional & scientific | 2017 |
| Agder-Team Eiendom AS | Real estate | 2009 |
| Agder-Team Revisjon AS | Professional & scientific | 2000 |
| Agderparken BN1 Tomt 1 AS | Real estate | 2023 |
| Agderparken BN1 Tomt 2 AS | Real estate | 2023 |
| Agderparken BN11 Tomt 16 AS | Real estate | 2023 |
| Agderparken Nord AS | Real estate | 2021 |
| Agderposten AS | Information & communication | 2001 |
| Agdir Drift AS | Professional & scientific | 2018 |
| Agentfabrikken AS | Information & communication | 2026 |
| Agf VVS AS | Construction | 2018 |
| Aginno AS | | 2018 |
| Ahj Holding AS | | 2021 |
| Ahmad Panam AS | Wholesale & retail | 2022 |
| AI+ Arkitekter AS | Professional & scientific | 2013 |
| Aima Holding AS | Real estate | 2005 |
| Airhill Aerospace Technologies AS | Transport & logistics | 2007 |
| Akaliko Holding AS | | 2024 |
| Akblikk AS | Construction | 2014 |
| Akland 2 AS | Real estate | 2013 |
| Aksess Bemanning AS | Administrative & support | 2019 |
| Aksess Holding AS | Administrative & support | 2019 |
| Aktiv Agder Holding AS | | 2025 |
| Al-Gazzi Invest AS | Hospitality | 2020 |
| Al-Trac AS | Manufacturing | 2021 |
| Alarmlink Sør AS | Construction | 2014 |
| Albo Møbler Arendal AS | Wholesale & retail | 2005 |
| Alf Birger Tallaksen AS | Transport & logistics | 2002 |
| Alibaba Grill & Pizza AS | Hospitality | 2020 |
| Allianse Montasje AS | Construction | 2020 |
| Alliumen AS | Wholesale & retail | 2021 |
| Almashhad AS | Professional & scientific | 2020 |
| Alpha Arkitekter AS | Professional & scientific | 1996 |
| Alpha Eiendom Og Invest AS | Real estate | 2021 |