| 1 Klikk AS | Wholesale & retail | 2012 |
| 1 Pluss 1 Bo Og Omsorgsbaser AS | Health & social care | 2013 |
| 1 SBX AS | Real estate | 2014 |
| 100% Godt Vasket AS | Administrative & support | 2021 |
| 1X Holding AS | | 2022 |
| 1X Technologies AS | Manufacturing | 2022 |
| 2042 Investments AS | Financial services | 2024 |
| 24 Karat Holding AS | | 2025 |
| 313 Eiendom AS | Real estate | 2017 |
| 365 Næringsutvikling AS | Real estate | 2022 |
| 3X Lien Eiendom AS | Real estate | 2018 |
| 4S Invest AS | | 2021 |
| 7TH Lab AS | Professional & scientific | 2025 |
| A Catering AS | Hospitality | 2021 |
| A Design AS | Professional & scientific | 2025 |
| A Renhold Og Vask AS | Administrative & support | 2018 |
| A&A Chefs Catering AS | Hospitality | 2023 |
| A.C.T. AS | Real estate | 1997 |
| A.R Invest AS | | 2024 |
| Aanerød AS | Real estate | 1985 |
| Abacco AS | Professional & scientific | 2019 |
| Abark AS | Professional & scientific | 2024 |
| Abc Invest Og Eiendom AS | Real estate | 1994 |
| Aberia Omsorg & Assistanse AS | Health & social care | 1988 |
| Aberia Ung AS | Health & social care | 2002 |
| Abild AS | Real estate | 1996 |
| Absorb Agentur Da | Administrative & support | 2008 |
| Abunor AS | Professional & scientific | 2022 |
| Abus Nordic | Professional & scientific | 2014 |
| Ac Schnitzer Norge AS | Wholesale & retail | 2018 |
| Acadu AS | Information & communication | 2023 |
| Acast Stories AS | Professional & scientific | 2019 |
| Acenta AS | Wholesale & retail | 2013 |
| Acti Chem Nuf | Wholesale & retail | 2006 |
| Activityfinder AS | Information & communication | 2026 |
| Acts Logistik Dienstleistungs Systeme AG | Administrative & support | 2000 |
| Acurum Norge AS | Real estate | 2024 |
| Ad Men AS | Professional & scientific | 2011 |
| Adapta Green Management AS | | 2020 |
| Adapti AS | Wholesale & retail | 1990 |
| Adapti Installasjon AS | Construction | 2004 |
| Adapti Solutions AS | Wholesale & retail | 2010 |
| Adata AS | | 2023 |
| Adduco Holding AS | | 2021 |
| Ademi Holding AS | | 2014 |
| Adia AS | Administrative & support | 2018 |
| Advicepeople HR Services AS | Professional & scientific | 2017 |
| Advisors Moe AS | Professional & scientific | 2018 |
| Advokat AS | Professional & scientific | 2008 |
| Advokat Even Rønvik AS | Professional & scientific | 1989 |
| Advokatfirma Lunde Robertsen AS | Professional & scientific | 2012 |
| Advokatfirmaet Monclair AS | Professional & scientific | 2009 |
| Advokatfirmaet Pedersen, Reier & Co AS | Professional & scientific | 1994 |
| Advokatfirmaet Varder AS | Professional & scientific | 2009 |
| Agilata AS | Information & communication | 2018 |
| Agronomic AS | Wholesale & retail | 2011 |
| Aiengineers AS | Information & communication | 2025 |
| Ais Music AS | Arts & recreation | 2021 |
| Aiw AS | Information & communication | 2021 |
| Ajr Eiendom AS | Real estate | 2011 |
| Ak Møbler AS | Wholesale & retail | 2020 |
| Ak Norge AS | Other services | 2022 |
| Akhtar Holding AS | | 2026 |
| Akinita AS | Real estate | 2023 |
| Akita Holding AS | | 2022 |
| Akj Desserthus AS | Hospitality | 2022 |
| Aksa Renhold AS | Administrative & support | 2020 |
| Akselsen Consulting AS | | 2012 |
| Aksjeselskapet Heidi Haugli AS | | 2024 |
| Aktiv Moss AS | Real estate | 2024 |
| Aktiva Revisjon AS | Professional & scientific | 2004 |
| Albeca AS | Manufacturing | 2020 |
| Alby Kafe AS | Hospitality | 2021 |
| Alby Kafe Drift AS | Hospitality | 2024 |
| Aleksander Martens Holm Holding AS | Education | 2021 |
| Aleksandersen Consulting AS | Professional & scientific | 2025 |
| Alex Andersen Norge AS | Transport & logistics | 2012 |
| Alexander Holding AS | | 2006 |
| Alexandru Oanca AS | Health & social care | 2024 |
| Alfa Bygg Og Våtrom AS | Construction | 2019 |
| Alfa Holding Og Invest AS | | 2020 |
| Alfies AS | Financial services | 2018 |
| Alfons Capital AS | | 2026 |
| Alfons Horizons AS | Professional & scientific | 2026 |
| Algomin AS | Wholesale & retail | 2018 |
| Alinco AS | Professional & scientific | 2024 |
| All-In Investments AS | Arts & recreation | 2023 |
| All-Tak Falck Og Engedal Ans | Construction | 1991 |
| Alliansepartner 1 AS | Professional & scientific | 2006 |
| Allicante Invest AS | | 2026 |
| Allpark AS | Transport & logistics | 2022 |
| Alna Forretningsbygg AS | Real estate | 1989 |
| Alna Rengjøring AS | Administrative & support | 1997 |
| Aloma Invest AS | Financial services | 2012 |
| Alpha Cargo AS | Transport & logistics | 2023 |
| Alphasun Ventures AS | | 2023 |
| Alten Holding AS | | 2020 |
| Altmuligtjenester AS | Construction | 2021 |
| Altura Sport AS | Wholesale & retail | 2017 |
| Aluvi Holding AS | | 2025 |