| 24 Renholdservice AS | Administrative & support | 2012 |
| 3 Skaug Eiendom AS | Real estate | 2021 |
| 3D Detailing & Bilpleie AS | Other services | 2020 |
| 3D Production AS | Manufacturing | 2021 |
| 3D Vask AS | Other services | 2023 |
| 4 Hjem AS | Health & social care | 2020 |
| 4HTA Holding AS | | 2021 |
| 5M Gruppen AS | Wholesale & retail | 2020 |
| A Holth Eiendom AS | Real estate | 2015 |
| A Invest AS | Wholesale & retail | 2024 |
| A. Rosenborg AS | Construction | 2013 |
| A. Tangen AS | Construction | 2021 |
| A.D Holding AS | | 2026 |
| A.K. Invest AS | | 2024 |
| Aabye Eiendom AS | Real estate | 2017 |
| Aage Jødahl AS | Professional & scientific | 2024 |
| Aasen & Arnesen Eiendom Ans | Real estate | 1987 |
| Aasen Bilformidling AS | Wholesale & retail | 2024 |
| Aasen Eiendomsinvest AS | Real estate | 2016 |
| Aasen Linjerydding AS | Professional & scientific | 2005 |
| AB Maleservice Ans | | 1991 |
| AB Utsikten Invest AS | Administrative & support | 2005 |
| Abc 3 AS | Administrative & support | 2004 |
| Abc Forum AS | Professional & scientific | 1986 |
| Abh Eiendom AS | Real estate | 2018 |
| Ac Sved AS | | 2021 |
| Acal Bfi Norway Nuf | Wholesale & retail | 1995 |
| Acc Glas Och Fasadkonsult AB | Professional & scientific | 2025 |
| Acsb Holding AS | | 2019 |
| Ad Studio AS | Other services | 2022 |
| Ad:Num AS | Professional & scientific | 1996 |
| Adal Auto Service AS | Other services | 2026 |
| Adeline Arnesen Holding AS | Professional & scientific | 2024 |
| Adenau AS | Wholesale & retail | 2014 |
| Adlon AS | Wholesale & retail | 2023 |
| Admdir Ans | | 1990 |
| Adrenalin Motorsport AS | Professional & scientific | 2024 |
| Advokat Camilla S. Walløe AS | Professional & scientific | 2020 |
| Advokat Christian Schumacher AS | Professional & scientific | 2026 |
| Advokat Christine Næss Mathiesen AS | Professional & scientific | 2024 |
| Advokat Guro Trillhus AS | Professional & scientific | 2025 |
| Advokat Hans Petter Askilsrud AS | Professional & scientific | 2023 |
| Advokat Harald Heggen Brørby AS | Professional & scientific | 2006 |
| Advokat Lars Reinsnos AS | Professional & scientific | 2013 |
| Advokat Nils Mugaas AS | Professional & scientific | 2019 |
| Advokat Stian Hatleberg AS | Professional & scientific | 2013 |
| Advokat Trine Hamborg Dahl AS | Professional & scientific | 2020 |
| Advokatfirmaet Buttingsrud Da | Professional & scientific | 2001 |
| Af Auto AS | Wholesale & retail | 2015 |
| Afrin AS | Hospitality | 2018 |
| Agebakken AS | Real estate | 2013 |
| Agro-Maskin AS | Agriculture & fishing | 2020 |
| Ah Partner AS | | 2016 |
| AI Økonomi AS | Professional & scientific | 2025 |
| Aia Eiendom AS | Real estate | 2022 |
| Aka AS | Real estate | 2017 |
| Aka Butikkeiendom AS | Real estate | 1997 |
| Aka Handelseiendommer AS | Real estate | 2011 |
| Aka Handelseiendommer Nord AS | Real estate | 2010 |
| Aka Osloveien AS | Real estate | 2017 |
| Aka Åssiden Eiendom AS | Real estate | 2008 |
| Akershus Eiendom & Invest AS | Real estate | 2010 |
| Aktiv Helse AS | Real estate | 2014 |
| Aktiv Rørteknikk AS | Construction | 2024 |
| Akupunktør Tine Alfredsen AS | Health & social care | 2015 |
| Alchemy Underwriting Nordics AB Nuf | Financial services | 2025 |
| Alfa Omega Billakkering AS | Other services | 2020 |
| Alfarvegen 7 AS | Real estate | 2021 |
| Alfredsen Holding AS | | 2025 |
| Algar AS | Wholesale & retail | 2021 |
| Algol Chemicals AS | Wholesale & retail | 2001 |
| All Entertainment AS | Information & communication | 2016 |
| Almemoen Eiendom AS | Real estate | 2024 |
| Almemoen Fus Barnehage AS | Education | 2018 |
| Alr Holding AS | Transport & logistics | 2005 |
| Alt R Mulig Ltd Nuf | Administrative & support | 2006 |
| Alt Sammen 24 AS | Transport & logistics | 2022 |
| Alta Butikkeiendom AS | Real estate | 2018 |
| Alta Handelseiendom AS | Real estate | 2018 |
| Altum Entreprenør AS | Construction | 2025 |
| Am Gruppen AS | Real estate | 2025 |
| Am Invest 1 AS | | 2021 |
| Am Management AS | Construction | 1990 |
| Am. Utvikling AS | Real estate | 2025 |
| Amst Invest AS | | 2021 |
| An Gravedrift AS | Construction | 2013 |
| Anc Prestige Interiors AS | Construction | 2025 |
| Andenes Handelsbygg AS | Real estate | 2018 |
| Anders Jacobsen Holding AS | Professional & scientific | 2020 |
| Anders Løchen Fogth AS | Wholesale & retail | 1990 |
| Andrew Wireless Systems GmbH Nuf | Information & communication | 1997 |
| Andslimoen Butikkeiendom AS | Real estate | 2019 |
| Ankenes Handelseiendom Narvik AS | Real estate | 2019 |
| Ankersgate 30 AS | Real estate | 1996 |
| Ankersgate 6 AS | Real estate | 2019 |
| Anlegg Og Bygg Stillasutleie AS | Administrative & support | 2011 |
| Anne B3 AS | Real estate | 2019 |
| Anne Katrine Skilbreid AS | Wholesale & retail | 2002 |
| Annegrete AS | | 2022 |
| Ans Heradsbygda Kiosk | Wholesale & retail | 1990 |