| Alstray AS | Real estate | 1919 |
| Alt I Betong AS | Construction | 2019 |
| Alt-Mulig-Mann AS | Construction | 2021 |
| Altiauto AS | Wholesale & retail | 2018 |
| Aluservices AS | Wholesale & retail | 2002 |
| Alvdent AS | Health & social care | 2012 |
| Alveberget Utvikling AS | Real estate | 2018 |
| Alytic AS | Professional & scientific | 2020 |
| Alytic Blue AS | | 2022 |
| Amadeus AS | | 2014 |
| Amcs Norge AS | Wholesale & retail | 2008 |
| Amfas Holding AS | | 2022 |
| Amfibie Service AS | Construction | 2003 |
| Amin Frisør AS | Other services | 2024 |
| Amit AS | | 2026 |
| Amm Invest AS | | 2021 |
| Amp Wheels AS | Wholesale & retail | 2022 |
| Ams Kirurgi AS | Health & social care | 2024 |
| Ams Omsorg AS | Health & social care | 2024 |
| Amtech Norge AS | Wholesale & retail | 2022 |
| Amundsnese AS | Professional & scientific | 2017 |
| Anders Langås AS | Wholesale & retail | 1988 |
| Andersen Lakk Og Karosseri AS | Other services | 2006 |
| Andrè Holding AS | Financial services | 2005 |
| Anfinnes Holding AS | | 2014 |
| Anlegg Snørydding Drift AS | Construction | 2016 |
| Aphrodite Jewellery by MG AS | Manufacturing | 2020 |
| Apotek 1 Stoa Vest AS | Wholesale & retail | 2024 |
| Aprova AS | Professional & scientific | 2010 |
| Aqua Fluid Biotech Group AS | Water & waste | 2020 |
| Aquasub AS | Construction | 2010 |
| Arbo Snekker AS | Construction | 2016 |
| Are Venemyr AS | | 2018 |
| Arendal Auto AS | Wholesale & retail | 2001 |
| Arendal Bedriftsrenhold AS | Administrative & support | 2024 |
| Arendal Bil AS | Wholesale & retail | 2013 |
| Arendal Bilmegler AS | Wholesale & retail | 2024 |
| Arendal Bilutleie AS | Administrative & support | 2007 |
| Arendal Bilvask AS | Other services | 2021 |
| Arendal BJJ AS | Education | 2017 |
| Arendal Boligutvikling AS | Real estate | 2013 |
| Arendal Brygge AS | Real estate | 2004 |
| Arendal Brygghus AS | Hospitality | 2024 |
| Arendal Brød AS | Manufacturing | 2019 |
| Arendal Bud & Varetaxi Da Torfinn Nordli Og Geir Aas. | Transport & logistics | 1989 |
| Arendal by AS | Professional & scientific | 2010 |
| Arendal by TSR 2029 AS | Administrative & support | 2026 |
| Arendal Bygg & Montasje AS | Construction | 2017 |
| Arendal Byggservice AS | Construction | 2018 |
| Arendal Byutvikling AS | Real estate | 2017 |
| Arendal Bådsenter AS | Wholesale & retail | 2005 |
| Arendal Båtskade Service AS | Manufacturing | 2010 |
| Arendal Casa Mia AS | Hospitality | 2020 |
| Arendal City Pizza AS | Hospitality | 2022 |
| Arendal Dekkservice AS | Wholesale & retail | 2022 |
| Arendal Dyreklinikk Ans | Professional & scientific | 1982 |
| Arendal Eiendom AS | Real estate | 1992 |
| Arendal Eiendomsmegling AS | Real estate | 2023 |
| Arendal El Team AS | Construction | 2016 |
| Arendal Entreprenør AS | Construction | 2024 |
| Arendal Festival Supply AS | Administrative & support | 2007 |
| Arendal Fiskemottak AS | Manufacturing | 2001 |
| Arendal Flis & Mur AS | Construction | 2025 |
| Arendal Fotterapi AS | Health & social care | 1999 |
| Arendal Fritidsordning AS | Health & social care | 2022 |
| Arendal Gro AS | Hospitality | 2006 |
| Arendal Gynekologi AS | Health & social care | 2021 |
| Arendal Hagesenter AS | Wholesale & retail | 2018 |
| Arendal Helsekost AS | Wholesale & retail | 2025 |
| Arendal Hotell AS | Hospitality | 2020 |
| Arendal Hudklinikk AS | Other services | 2021 |
| Arendal Incoming AS | Other services | 2026 |
| Arendal Kjøkkensenter AS | Wholesale & retail | 2021 |
| Arendal Kulturhus AS | Arts & recreation | 2003 |
| Arendal Logistikk AS | Transport & logistics | 2014 |
| Arendal Logistikkinvest AS | Real estate | 2011 |
| Arendal Lydsystemer AS | Wholesale & retail | 1997 |
| Arendal Motor AS | Wholesale & retail | 2024 |
| Arendal Nybygg AS | Construction | 2024 |
| Arendal Næringsselskap AS | Real estate | 2021 |
| Arendal Og Omegn Begravelsesbyrå Olaf Slaattene AS | Other services | 1980 |
| Arendal Optikk AS | Wholesale & retail | 2006 |
| Arendal Regnskapsrådgivning AS | Professional & scientific | 2023 |
| Arendal Rør AS | Construction | 2023 |
| Arendal Servering AS | Hospitality | 2004 |
| Arendal Sound Innovations AS | Professional & scientific | 2020 |
| Arendal Sound International AS | Wholesale & retail | 2020 |
| Arendal Specsavers AS | Wholesale & retail | 2014 |
| Arendal Sport & Fitness-Senter AS | Arts & recreation | 2010 |
| Arendal Sport Og Eiendom AS | Real estate | 2003 |
| Arendal Subsea Services AS | Construction | 2018 |
| Arendal Sushi AS | Hospitality | 2017 |
| Arendal Takservice AS | Construction | 1999 |
| Arendal Takst & Prosjektering AS | Professional & scientific | 2025 |
| Arendal Tannklinikk AS | Health & social care | 2025 |
| Arendal Taxi AS | Transport & logistics | 2023 |
| Arendal Trening AS | Arts & recreation | 2009 |
| Arendal Utleie AS | Administrative & support | 2016 |
| Arendal Utvikling AS | Real estate | 2007 |
| Arendal Varmesenter AS | Wholesale & retail | 1987 |