| Alfa Fagbygg AS | Construction | 2021 |
| Alfa Stålentreprise AS | Construction | 2016 |
| Alglass AS | Manufacturing | 2002 |
| Alico Bilombygging AS | Other services | 2017 |
| Alisanna AS | Wholesale & retail | 2017 |
| Alivo AS | Health & social care | 2024 |
| Alkom II Grzegorz Marek Pastuszak | Construction | 2006 |
| Allaround AS | Professional & scientific | 2024 |
| Allhjelp Haugesund AS | Administrative & support | 2018 |
| Alliance Invest Prosjekt AS | Hospitality | 2007 |
| Almsi AS | Health & social care | 2020 |
| Alne & Sandvik AS | Real estate | 2014 |
| Alphasec AS | Administrative & support | 2025 |
| Alsting AS | Financial services | 2016 |
| Alt for Film AS | Information & communication | 2017 |
| Alvseike Eiendom AS | Real estate | 2021 |
| Am Audio & CNC AS | Professional & scientific | 2023 |
| Amanda Barnehage SA | Education | 2002 |
| Amanda Kjøkken Og Kafe AS | Hospitality | 2022 |
| Amanda Regnskap AS | Professional & scientific | 2016 |
| Amaro Invest AS | Professional & scientific | 2005 |
| Amb Holding AS | Wholesale & retail | 2008 |
| Amm AS | Real estate | 2005 |
| Ammam Invest AS | | 2026 |
| Amplify Holding AS | | 2010 |
| Amrak Eiendom AS | Real estate | 2013 |
| Ams Handel AS | Financial services | 2008 |
| Amt Art AS | Arts & recreation | 2020 |
| Amudent AS | Financial services | 2005 |
| Amundsen Spesial Amanda AS | Wholesale & retail | 2014 |
| Amundsen Spesial AS | Wholesale & retail | 2009 |
| Amundsen-Trading AS | Wholesale & retail | 2021 |
| Analytic Minds AS | Information & communication | 2014 |
| Anders Ohm Holding AS | Real estate | 2017 |
| Andmartho Holding AS | | 2026 |
| Andreassen Ønh AS | Health & social care | 2020 |
| Andreentreprenør AS | Real estate | 2016 |
| Andvare Holding AS | | 2021 |
| Angel AS | Real estate | 1986 |
| Anjo AS | Real estate | 1995 |
| Anker AS | Wholesale & retail | 1990 |
| Anker Dekk AS | Wholesale & retail | 2019 |
| Anlegg & Fjellteknikk AS | Construction | 2011 |
| Anleggsgartnermester Håkon Bjørndal AS | Administrative & support | 2016 |
| Anna Nilssens Minne SA | Education | 2002 |
| Anna's Bunadsmontering AS | Other services | 2022 |
| Annapurna Holding AS | | 2021 |
| Anne B Grunnaleite Holding AS | Financial services | 2005 |
| Annekset AS | Arts & recreation | 2005 |
| Anskot Eiendom AS | Real estate | 2007 |
| Antonisen Holding AS | | 2024 |
| Apeland Eikemo Holding AS | Wholesale & retail | 2021 |
| Apeland Maskinservice AS | Manufacturing | 2019 |
| Apollo Brygge AS | Wholesale & retail | 2007 |
| Apollo Båt AS | Wholesale & retail | 2007 |
| Apollo Invest AS | Wholesale & retail | 2007 |
| Appex Ansatt Holding AS | Financial services | 2021 |
| Appex AS | Information & communication | 2010 |
| Appex Holding AS | Real estate | 2016 |
| Aqoryx Holding AS | | 2026 |
| Aqoryx Ipco AS | | 2026 |
| Aqoryx Opco AS | | 2026 |
| Aqua Metrica AS | Professional & scientific | 1990 |
| Aquafarm Equipment AS | Manufacturing | 2004 |
| Aquafarm Utleie AS | Administrative & support | 2018 |
| Aquafarm Utvikling AS | Professional & scientific | 2016 |
| Arcavia AS | Wholesale & retail | 2025 |
| Arctic Earth Science, Aes, AS | Real estate | 2009 |
| Arctic Yield AS | Professional & scientific | 2022 |
| Ardi AS | | 2022 |
| Argus Profil AS | Professional & scientific | 2008 |
| Arketype Studio AS | Professional & scientific | 2026 |
| Arkipelet AS | Professional & scientific | 1994 |
| Arla AS | Real estate | 2024 |
| Armik AS | Professional & scientific | 2013 |
| Arne Horneland AS | Wholesale & retail | 2000 |
| Arne Østensjø III AS | | 2020 |
| Arnfinn Knutsen Holding AS | Real estate | 2013 |
| Artcom Ans | Wholesale & retail | 1999 |
| Artimino Holding AS | | 2015 |
| Artis & Partners AS | Education | 2013 |
| Artline by Laura AS | Other services | 2023 |
| Arts Invest AS | Real estate | 2006 |
| Arvid Vestre AS | Wholesale & retail | 2014 |
| AS Asalvikveien 46 | Households | 1946 |
| AS Atlantis | Wholesale & retail | 1972 |
| AS Bråvallagaten | Households | 1990 |
| AS Flathauggt 45 | Households | 1953 |
| AS Havørn | Transport & logistics | 1929 |
| AS Karma | Real estate | 1987 |
| AS Kongshaug | Real estate | 1921 |
| AS Lasse Sport | Wholesale & retail | 1961 |
| AS Minde Shipping & Agency | Transport & logistics | 1980 |
| AS Nybygg | Households | 1948 |
| AS Parkeringsutvikling | Real estate | 2008 |
| AS Porshaug | Transport & logistics | 1962 |
| AS Porsholmen | Manufacturing | 1941 |
| AS Skotex | Real estate | 1959 |
| AS Stordøy | Real estate | 1986 |
| AS Strandgaten 170 | Real estate | 1924 |