| Akselera AS | Professional & scientific | 2005 |
| Akselera Norway AS | Information & communication | 2008 |
| Aksio Actuarial Intelligence AS | Financial services | 2021 |
| Aksio Holding AS | Financial services | 2021 |
| Aksio Insurtech AS | Information & communication | 2021 |
| Aktiv Handel AS | Wholesale & retail | 2020 |
| Alauritz Invest AS | Real estate | 2015 |
| Alc Holding AS | Administrative & support | 2018 |
| Alcon Nordic A/S Nuf | Wholesale & retail | 2013 |
| Alfalab AS | Professional & scientific | 2023 |
| Alfanor 26063 AS | | 2026 |
| Alfanor 26064 AS | | 2026 |
| Algarheim Skolebygg AS | Real estate | 2017 |
| Algarheim Skoledrift AS | Real estate | 2017 |
| All for You AS | Other services | 2013 |
| Alma Clean Power AS | Professional & scientific | 2021 |
| Already on AS | Information & communication | 2007 |
| Altiprofil AS | Wholesale & retail | 2013 |
| Altona Security Engineering AS | Professional & scientific | 2015 |
| Amadores Invest AS | | 2021 |
| Analyticon AS | Professional & scientific | 1990 |
| Analytics AS | Information & communication | 2018 |
| Anchor AS | | 2025 |
| Andbeyond Spirits AS | Wholesale & retail | 2023 |
| Andørjaveien 1672 AS | Real estate | 2025 |
| Anma Holding AS | | 2025 |
| Ansema AS | Professional & scientific | 2019 |
| Antarctic Harvesting Holding AS | Agriculture & fishing | 2014 |
| Antarctic Invest AS | Manufacturing | 2016 |
| Antares Utvikling AS | Real estate | 2021 |
| Ap Biglog AS | Real estate | 2021 |
| Ap Parkering AS | Real estate | 2012 |
| Ap S20 AS | Real estate | 2020 |
| Ap Yield AS | Real estate | 2017 |
| Apg Invest AS | | 2025 |
| Apollø AS | Professional & scientific | 2023 |
| Appnexus Norway AS | Wholesale & retail | 2014 |
| Arc Group Holding AS | Transport & logistics | 2018 |
| Arcatum AS | Real estate | 1994 |
| Arctic Medical AS | Wholesale & retail | 2020 |
| Arctic Timber AS | | 1998 |
| Arktis Holding AS | Manufacturing | 1991 |
| Art Advice AS | Financial services | 1998 |
| Artistpartner AS | Professional & scientific | 2024 |
| Arve Ryen & Sønn Isolasjonsfirma AS | Construction | 1997 |
| AS Adminco | Financial services | 1968 |
| AS Backe | Construction | 1980 |
| AS Bjerkaasgården | Real estate | 1960 |
| AS Cetus | Real estate | 1964 |
| AS Deco | Financial services | 1966 |
| AS Fewcome | Real estate | 1970 |
| AS Good AS IT Gets | Professional & scientific | 2018 |
| AS Kassiopeia | Real estate | 1936 |
| AS Pollux | Other services | 1962 |
| AS Taurus | Real estate | 1931 |
| AS Tres | Real estate | 1926 |
| AS Uranus Holding | Real estate | 1954 |
| AS W Wilhelmsen | Real estate | 1903 |
| AS3 Norge AS | Education | 2001 |
| Ascensia Diabetes Care Norway AS | Wholesale & retail | 2015 |
| Ascertra AS | Information & communication | 2017 |
| Asker Miljøpark AS | Water & waste | 2019 |
| Askeveien Eiendom AS | Real estate | 2018 |
| Aspentech Norway AS | Information & communication | 1984 |
| Assist Air Limited Nuf | Administrative & support | 2010 |
| Astomed AS | Wholesale & retail | 2022 |
| Astrum Group AS | Professional & scientific | 2019 |
| At Drift AS | Construction | 2024 |
| At-Wine AS | Wholesale & retail | 2020 |
| Atelierhagen AS | Real estate | 2018 |
| Athlete Factory AS | Education | 2023 |
| Atlanticx Norway AS | Manufacturing | 2020 |
| Atlas Exl 011 Ans | Professional & scientific | 2025 |
| Atradius Crédito Y Caución S.A. De Seguros Y Reaseguros Nuf | Financial services | 2016 |
| Atradius Information Services B.V. Nuf | Administrative & support | 2007 |
| Audentes Fortuna Adiuvat AS | Wholesale & retail | 2022 |
| Auralight AS | Wholesale & retail | 1973 |
| Aussie Invest AS | | 2018 |
| Autentico AS | Wholesale & retail | 2011 |
| Automa AS | Administrative & support | 2008 |
| Automatix AS | Information & communication | 2024 |
| Aven Consulting AS | Professional & scientific | 2021 |
| Avendur Nordic AS | Real estate | 2026 |
| Avf Holding AS | | 2023 |
| Avid Technology International BV | Information & communication | 2005 |
| Avida Bank AB (Publ) Nuf | Financial services | 2007 |
| Avium Subsea AS | Mining & quarrying | 2016 |
| Awinvest AS | Professional & scientific | 2005 |
| Axiell Norge AS | Information & communication | 1987 |
| Ayla Corp AS | Wholesale & retail | 2024 |
| B & R Wine AS | Wholesale & retail | 2010 |
| B/A Holding AS | | 2024 |
| BA37 Parkering AS | Real estate | 2024 |
| Bacchus Wines AS | Wholesale & retail | 2016 |
| Backe Digital AS | Information & communication | 2020 |
| Backe Eiendom Boligforvaltning AS | Real estate | 2017 |
| Backe Eiendom Invest AS | Real estate | 1998 |
| Backe Entreprenør AS | Construction | 2010 |
| Backe Forny AS | Construction | 2004 |
| Backe Holding AS | Real estate | 2021 |