| 1009 Invest AS | | 2024 |
| 2 Minutter for Holding AS | Real estate | 2018 |
| 2VRØSKAFT AS | Professional & scientific | 2025 |
| 4 You Regnskap AS | Professional & scientific | 2012 |
| 40 Grader AS | Real estate | 2020 |
| 4TEST Instrument AS | Wholesale & retail | 2002 |
| A Holm AS | | 2023 |
| A Til B AS | Transport & logistics | 2023 |
| A Til B Holding AS | Transport & logistics | 2023 |
| A-B Byggtjenester AS | Real estate | 2005 |
| A38 Arkitekter AS | Professional & scientific | 2015 |
| A38 Invest AS | Professional & scientific | 1993 |
| Aaas Murflis AS | Construction | 2020 |
| Aabel & Figli AS | Wholesale & retail | 2025 |
| Aamarstua AS | Professional & scientific | 2025 |
| Aasmundrud Invest AS | Real estate | 2024 |
| Abc Entreprenør AS | Construction | 2011 |
| Abc Forvaltning AS | Professional & scientific | 2008 |
| Abintus AS | Health & social care | 2008 |
| Abra Finance AS | Professional & scientific | 1996 |
| Abra Regnskap Og Rådgivning AS | Professional & scientific | 2011 |
| Acini Capital AS | Information & communication | 1964 |
| Acini Holding AS | Information & communication | 2007 |
| Acini Invest AS | | 2019 |
| Acri Invest AS | Financial services | 2018 |
| Adam Ventures Partners AS | Information & communication | 2025 |
| Admiral Energy AS | Professional & scientific | 2016 |
| Admiral Offshore AS | Professional & scientific | 2008 |
| Advokatfirma Varjag AS | Professional & scientific | 1993 |
| Aegir Holding AS | Professional & scientific | 2005 |
| Aesse Management AS | Administrative & support | 2015 |
| Agio Kapital AS | Real estate | 2017 |
| Ahara AS | Professional & scientific | 2005 |
| Aideus AS | | 2022 |
| Akg Invest AS | Real estate | 2021 |
| Akkodis Edge Asia AS | Information & communication | 2000 |
| Akkodis Edge Norway AS | Information & communication | 1986 |
| Akkodis Group Nordics AS | Information & communication | 1994 |
| Akkodis Norway R&D Services AS | Information & communication | 1998 |
| Akm Norway Holding AS | Wholesale & retail | 2023 |
| Akudok AS | Health & social care | 1994 |
| Akula Technology AS | Professional & scientific | 2021 |
| Albatross Ventures AS | | 2024 |
| Albico AS | Professional & scientific | 2014 |
| Aledan Holding AS | Professional & scientific | 2016 |
| Alexander Reklamebyrå AS | Professional & scientific | 2020 |
| Alexandra Invest AS | Financial services | 2015 |
| Alfa & Blikk Bygg AS | Construction | 2009 |
| Alfa Craft Bygg AS | Construction | 2012 |
| Alfanor 26047 AS | | 2026 |
| Alfanor 26051 AS | | 2026 |
| Alfanor 26055 AS | | 2026 |
| Alfanor 26061 AS | | 2026 |
| Alfanor 26066 AS | | 2026 |
| Alfanor 26067 AS | | 2026 |
| Alfanor 26068 AS | | 2026 |
| Alfanor 26069 AS | | 2026 |
| Alfanor 26070 AS | | 2026 |
| Aligned Robotics AS | Professional & scientific | 2025 |
| Allsidig Forsikring AS | Professional & scientific | 2001 |
| Almås Foredrag AS | Education | 2019 |
| Alpha Taksering AS | Real estate | 2023 |
| Alutre AS | Wholesale & retail | 2022 |
| Amarie AS | Financial services | 2005 |
| Amoria AS | Wholesale & retail | 2015 |
| Amsoco Holding AS | Financial services | 2007 |
| Amundsen Invest AS | | 2022 |
| Anatas AS | | 2020 |
| Andersen Service AS | Other services | 2026 |
| Anderson Invest AS | Real estate | 2005 |
| Andersson & Kornstad AS | Real estate | 1957 |
| Andøco Invest AS | Financial services | 2000 |
| Anelom AS | Professional & scientific | 2020 |
| Anirbas AS | Financial services | 2015 |
| Anjo Holding AS | | 2005 |
| Anl Invest AS | Real estate | 2024 |
| Annebblis AS | | 2021 |
| Ap Capital AS | Professional & scientific | 2016 |
| Apexcore Group AS | Construction | 2026 |
| Appi AS | Information & communication | 2017 |
| Appi Invest AS | | 2021 |
| Aqualung Carbon Capture AS | Professional & scientific | 2021 |
| Arctic Orthopedic Solutions AS | Manufacturing | 2023 |
| Argo Invest AS | | 2021 |
| Arka Invest AS | Wholesale & retail | 2007 |
| Arna Clinic AS | Health & social care | 2015 |
| Arne Haldås AS | | 2021 |
| Arne Loen AS | Real estate | 2004 |
| Art Development AS | Real estate | 2015 |
| Arthrex Norway AS | Wholesale & retail | 2015 |
| Artic Healthcare AS | Wholesale & retail | 2020 |
| Artic Nutrition AS | Wholesale & retail | 2013 |
| Artic Retail AS | Wholesale & retail | 2022 |
| Articlion AS | Wholesale & retail | 2014 |
| Artjoker Nordic AS | Information & communication | 2025 |
| AS Corint | Administrative & support | 1987 |
| AS Günther | Construction | 2022 |
| AS Nordstrandshøiden Management | Real estate | 1973 |
| AS Rosenbach | Real estate | 1991 |
| AS Walco | Professional & scientific | 1981 |