| Annika Rautakoura AS | Professional & scientific | 2022 |
| Annlaug Stensland AS | Health & social care | 2016 |
| Annoka AS | Real estate | 2005 |
| Anoka AS | Professional & scientific | 2026 |
| Anorthosite Group AS | Mining & quarrying | 1988 |
| Anro Holding AS | Information & communication | 2024 |
| Ans Beddingen Hjemmel | Real estate | 1989 |
| Ans Fjordalleen 16 Hjemmel | Real estate | 1989 |
| Ans Sjøsiden 1 Hjemmel | Real estate | 1989 |
| Ans Sjøsiden 2 Hjemmel | Real estate | 1989 |
| Ans Torgalmenningen 14 Hjemmel | Real estate | 1989 |
| Ansa Invest AS | | 2014 |
| Ansol Holdings AS | | 2023 |
| Ansol Invest AS | | 2005 |
| Ansytek Invest AS | | 2017 |
| Anthonisen Invest AS | | 2025 |
| Anthope AS | | 1995 |
| Anticoach AS | Arts & recreation | 2019 |
| ANYPLAN3D AS | Information & communication | 2021 |
| Anøy Invest Da | Financial services | 2008 |
| Aoa & Sol Holding AS | | 2021 |
| Aobraa Holding AS | | 2023 |
| Aoz AS | Professional & scientific | 2017 |
| Ap Sports Management AS | Professional & scientific | 2022 |
| Apalos AS | | 2026 |
| Apelz Holding AS | | 2025 |
| Apex Ans | Professional & scientific | 1996 |
| Apex Bergen AS | Professional & scientific | 2025 |
| Apex Studio AS | Professional & scientific | 2026 |
| Apex Økonomi AS | Professional & scientific | 2026 |
| Apoiesis AS | Professional & scientific | 2021 |
| Apollon Platefabrikk AS | Information & communication | 2022 |
| Apollon Ølimport AS | Wholesale & retail | 2023 |
| Apotek 1 Nattland AS | Wholesale & retail | 2016 |
| Apovest Drift AS | Wholesale & retail | 2015 |
| Apparat AS | Information & communication | 2017 |
| Apparat Studio AS | Information & communication | 2021 |
| Appendix Holding AS | Health & social care | 2006 |
| Appivate AS | Information & communication | 2015 |
| Appsalon AS | Information & communication | 2022 |
| Apricum AS | | 2021 |
| Apriil AS | Professional & scientific | 2023 |
| Apriil Brunch Holding AS | Professional & scientific | 2024 |
| Apriil Digital AS | Professional & scientific | 1992 |
| Apriil Digital V AS | Professional & scientific | 2015 |
| Apriil Media AS | Professional & scientific | 2014 |
| Apriil PR AS | Professional & scientific | 1999 |
| Apriil Reklame AS | Professional & scientific | 1999 |
| Aqknowledge AS | Professional & scientific | 2023 |
| Aquacloud AS | Information & communication | 2020 |
| Aquapath AS | Administrative & support | 2024 |
| Aqwator AS | Professional & scientific | 2016 |
| Arabesk Invest AS | Financial services | 2005 |
| Aragon AS | Professional & scientific | 2006 |
| Aran Holding AS | Real estate | 2016 |
| Aratech AS | Professional & scientific | 2026 |
| Arbeidsgruppen Hus AS | Professional & scientific | 2001 |
| Arbeidshjelpen Da | Administrative & support | 2008 |
| Arbeidsklærsenteret AS | Wholesale & retail | 2007 |
| Arbeidspsykolog AS | Health & social care | 2015 |
| Arch Adventures AS | Administrative & support | 2025 |
| Archery AS | | 2020 |
| Archtech Consulting AS | Information & communication | 2023 |
| Arctic Fish Holding AS | Agriculture & fishing | 2020 |
| Arctic Padel AS | Administrative & support | 2020 |
| Arctic Puffin Invest AS | | 2021 |
| Arctic Wave Films AS | Information & communication | 2020 |
| Arctica Elektronisk Presse Og Forlagstjenester Da | Information & communication | 1998 |
| Ard Arealplan AS | Professional & scientific | 2008 |
| Arealforum AS | Real estate | 2005 |
| Arealia AS | Real estate | 2003 |
| Arealinvest AS | Real estate | 1998 |
| Arealutvikling AS | Real estate | 1986 |
| Arefjord AS | | 2024 |
| Arenabygg AS | Real estate | 2007 |
| Areté Media AS | Professional & scientific | 2020 |
| Arevya AS | Arts & recreation | 2023 |
| Argentum 2017 AS | Financial services | 2017 |
| Argentum 2018 AS | Financial services | 2018 |
| Argentum 2019 AS | Financial services | 2019 |
| Argentum 2020 AS | Financial services | 2020 |
| Argentum 2021 AS | Financial services | 2021 |
| Argentum 2022 AS | Financial services | 2022 |
| Argentum 2022 Invest AS | | 2023 |
| Argentum 2023 AS | Financial services | 2023 |
| Argentum 2023 Invest AS | | 2023 |
| Argentum 2024 AS | Financial services | 2024 |
| Argentum 2024 Invest AS | | 2024 |
| Argentum 2025 AS | Financial services | 2024 |
| Argentum 2025 Invest AS | | 2025 |
| Argentum 2026 AS | Financial services | 2026 |
| Argentum 2026 Invest AS | | 2026 |
| Argentum Alternative Investments AS | Financial services | 2018 |
| Argentum AS | Transport & logistics | 2023 |
| Argentum Asset Management AS | Financial services | 2013 |
| Argentum Business Management AS | Financial services | 2018 |
| Argentum Eis AS | Financial services | 2018 |
| Argentum Fondsinvesteringer AS | Financial services | 2001 |
| Argentum General Partner a AS | Financial services | 2021 |
| Argentum Invest Xix AS | Financial services | 2022 |