| 3DVIBBER AS | Professional & scientific | 2018 |
| 4 Antz AS | Transport & logistics | 2017 |
| 4070 Gruppen AS | Hospitality | 2022 |
| 4C Solutions AS | Professional & scientific | 2015 |
| Aanvest AS | | 2021 |
| Aasj Invest AS | | 2025 |
| Ablegøyer AS | Real estate | 2019 |
| Absolution AS | Professional & scientific | 2022 |
| Acb AS | Real estate | 2013 |
| Ace Well Technology AS | Professional & scientific | 2012 |
| Ache AS | Health & social care | 2023 |
| Aftensang AS | Financial services | 2019 |
| Agm Invest AS | Financial services | 2005 |
| Aiho Invest AS | Real estate | 2022 |
| Alfa Nordic Services AS | Mining & quarrying | 1992 |
| Alhambra Lampene AS | Education | 2021 |
| Alive Entertainment AS | Arts & recreation | 2022 |
| Alive Produksjoner AS | Arts & recreation | 2020 |
| Alkovi AS | Financial services | 2016 |
| Alnabru Isolering AS | Real estate | 2023 |
| Alphatek AS | Professional & scientific | 2017 |
| Altera AS | Other services | 2015 |
| Amanda Holding AS | Wholesale & retail | 2005 |
| Aml Horisont AS | Financial services | 2005 |
| Anders Nilsson AS | Wholesale & retail | 2022 |
| Anubis Forlag AS | Information & communication | 2025 |
| Any Eiendom AS | Real estate | 2024 |
| Any Holding AS | Real estate | 2024 |
| Anzett AS | Manufacturing | 2012 |
| Ao Holding AS | Financial services | 2005 |
| Aramark Norge Offshore AS | Hospitality | 1995 |
| Aramark Norge Offshore Fixed Installations AS | Hospitality | 2023 |
| Aramark Norge Onshore Services AS | Hospitality | 2006 |
| Arctic Spiseri Avd. Randaberg AS | Hospitality | 2023 |
| Arkidea Konsept AS | Professional & scientific | 2017 |
| Armart AS | Professional & scientific | 2015 |
| Arsenal FT Holding AS | Real estate | 2017 |
| Arvid Sande AS | Professional & scientific | 2023 |
| Arvyd Bygg AS | Construction | 2020 |
| Asbjørn Flatebø Holding AS | Financial services | 2017 |
| Ascendo International AS | Professional & scientific | 2012 |
| Asheimtunet Varme AS | Energy | 2019 |
| Askepott Holding AS | | 2020 |
| Aste Holding AS | Real estate | 2014 |
| At Innlandet AS | Wholesale & retail | 2026 |
| At Management AS | Professional & scientific | 2026 |
| At Nord AS | Wholesale & retail | 2026 |
| At Rør AS | Construction | 1988 |
| At Sør AS | Wholesale & retail | 2026 |
| At Sør-Trøndelag AS | Professional & scientific | 2026 |
| At Traktoreiendom AS | Real estate | 2019 |
| At Traktorholding AS | Wholesale & retail | 2020 |
| At Øst AS | Wholesale & retail | 2026 |
| Atd Holding AS | | 2025 |
| Atlantis Oil AS | Wholesale & retail | 2009 |
| Atore Invest AS | | 2024 |
| Attend Be AS | Professional & scientific | 2018 |
| Attra Eiendom AS | Real estate | 2016 |
| Attra Prosjekt 3 AS | Real estate | 2023 |
| Aurdal Investering AS | Real estate | 2007 |
| Auregia AS | Transport & logistics | 1991 |
| Av Inform AS | Information & communication | 2014 |
| Avfallservice AS | Wholesale & retail | 2018 |
| Aviato Holding AS | | 2026 |
| B Bergesen Holding AS | Wholesale & retail | 2005 |
| Babo Invest AS | Real estate | 2024 |
| Baconsnake AS | | 2025 |
| BB Trading Ans | Wholesale & retail | 1987 |
| BC Capital AS | | 2019 |
| Bcic AS | | 2023 |
| Berge Konsult AS | Financial services | 2010 |
| Bio Drift AS | Professional & scientific | 2015 |
| Birkeland & Møller Eiendom AS | Real estate | 2023 |
| Bitsi AS | Information & communication | 2024 |
| Bjarte Rannestad Holding AS | Real estate | 2021 |
| Blueprint Innovations AS | Professional & scientific | 2016 |
| Blund Holding AS | | 2023 |
| Blåvatn AS | Financial services | 2012 |
| BMP Eiendom AS | Real estate | 2014 |
| Bna AS | Professional & scientific | 2025 |
| Bogafjell Bioenergi AS | Energy | 2018 |
| Boing AS | Professional & scientific | 2026 |
| Bolfa Bygg AS | Construction | 2025 |
| Boliggass AS | Construction | 2013 |
| Boly Holding AS | Wholesale & retail | 2021 |
| BR Eiendom Thu AS | Real estate | 2004 |
| BR Industrier AS | Real estate | 2000 |
| Brawn AS | Professional & scientific | 2023 |
| Brekke Investering AS | Financial services | 2005 |
| Brekkes Holding AS | | 2023 |
| Bri Agri AS | Wholesale & retail | 2008 |
| Bri Basedrift AS | Real estate | 2011 |
| Bri Eiendom AS | Real estate | 1994 |
| Bri Oil & Gas AS | Manufacturing | 2010 |
| Bri Production AS | Manufacturing | 2010 |
| Bri Utvikling AS | Professional & scientific | 2015 |
| Buono AS | Professional & scientific | 2009 |
| Business Iq Nuf | Information & communication | 2005 |
| Buster & Co AS | Wholesale & retail | 2007 |
| BVT AS | Construction | 1999 |