| A-Personell Bygg Og Industri AS | Administrative & support | 2011 |
| A-Personell Connect AS | Construction | 2017 |
| A.D.A. Gjerde & Håndverk AS | Construction | 2021 |
| A.R.S. Holding AS | Administrative & support | 2022 |
| Abbovakt AS | Information & communication | 2026 |
| Abc Group AS | Professional & scientific | 2021 |
| Abs-Maskin AS | Wholesale & retail | 2010 |
| Accensus Consulting AS | Professional & scientific | 2022 |
| Accept Dental AS | Health & social care | 2022 |
| Account Group AS | Professional & scientific | 2021 |
| Ace Holdings AS | | 2024 |
| Adapteo AS | Administrative & support | 2018 |
| Adt Eiendom AS | Real estate | 2018 |
| Adt Holding AS | Transport & logistics | 2017 |
| Advanced Machine Company AS | Manufacturing | 2001 |
| Advokatfirmaet Borgen Da | Professional & scientific | 1996 |
| Afl Enterprise AS | Professional & scientific | 2013 |
| Aga Deminvest AS | Financial services | 2005 |
| Agmine Consectamur Invest AS | Financial services | 2023 |
| Aida Drift AS | Wholesale & retail | 2025 |
| Air Invest AS | Transport & logistics | 2021 |
| Aja Holding AS | Real estate | 2011 |
| Aker Og Hoen AS | Agriculture & fishing | 2024 |
| Aksjekongen Holding AS | | 2025 |
| Aktiv Kontraktstyring AS | Information & communication | 2024 |
| Aktiv Septik Drammen AS | Water & waste | 2018 |
| Aktuell Produkt Da | | 1990 |
| Alegro AS | Administrative & support | 2017 |
| Alfa Omega EM2CS AS | Construction | 2020 |
| Alm Og Sønn AS | Construction | 2018 |
| Almeq International AS | Professional & scientific | 1966 |
| Alticom AS | Construction | 2010 |
| Amalie Eiendom AS | Real estate | 2016 |
| Amblithon Optimal Da | Information & communication | 2025 |
| Anders Kvale AS | Financial services | 2012 |
| Andersen & Moen Bygg AS | Construction | 2012 |
| Andersen & Nilsen Holding AS | Wholesale & retail | 2010 |
| Andersen Kran- Og Liftutleie AS | Construction | 2012 |
| Anf Konsulent AS | Professional & scientific | 2020 |
| Annadablam AS | | 2016 |
| Anno 1723 AS | Real estate | 2015 |
| Antheo AS | Construction | 2020 |
| Antonsen & Bruknapp Ans | Administrative & support | 1990 |
| Arel Holding AS | Construction | 2021 |
| Arne Bråthen AS | Other services | 1982 |
| Aronsen Klær AS | Wholesale & retail | 2025 |
| AS Bråtabakken Bensin & Service | Other services | 1982 |
| AS Hi-Ma | Construction | 1981 |
| Asbjørn Dahlen Transport AS | Transport & logistics | 2018 |
| Ascend Ventures AS | | 2025 |
| Ask Eiendom AS | Real estate | 1992 |
| Ask Elektro AS | Construction | 1979 |
| Ask Holding AS | Real estate | 2005 |
| Asker Entreprenøren AS | Construction | 2019 |
| Aspeholen Holding AS | | 2007 |
| Atco AS | Professional & scientific | 2024 |
| Atello AS | Wholesale & retail | 2007 |
| Atello Holding AS | Wholesale & retail | 2024 |
| Autohjørnet AS | Other services | 2005 |
| Automatch AS | Wholesale & retail | 2013 |
| Autoport AS | Wholesale & retail | 2017 |
| Avat AS | Professional & scientific | 2019 |
| Axa Group AS | Professional & scientific | 2022 |
| Axlab Nuf | Wholesale & retail | 2023 |
| Axum Software AS | Information & communication | 2010 |
| Axxent AS | | 2018 |
| Azk AS | Construction | 2021 |
| B & M Invest AS | Hospitality | 2025 |
| B&B Eiendommer AS | Real estate | 2024 |
| B&M Bolig AS | Real estate | 2021 |
| Bajas Vista AS | Wholesale & retail | 2020 |
| Bakke Transport & Eiendom AS | Wholesale & retail | 1985 |
| Bakke Transport AS | Transport & logistics | 2004 |
| BAKKE1 AS | Real estate | 2025 |
| Bakken Bygg Og Anlegg AS | Construction | 2014 |
| Baklid Forskaling AS | Construction | 2021 |
| Bartek Trading | Wholesale & retail | 2000 |
| Batsen AS | Transport & logistics | 2017 |
| BB Design & Eiendom AS | Professional & scientific | 2003 |
| BBK Entreprenør AS | Construction | 2012 |
| Bbo Holding AS | Financial services | 2018 |
| Be Amazing AS | Wholesale & retail | 2012 |
| Beauty Bar AS | Other services | 2020 |
| Bedriftsrådgivning 24 Timer AS | Professional & scientific | 2019 |
| Bekkevold Holding AS | Administrative & support | 1997 |
| Bent Arnesen Holding AS | Real estate | 2017 |
| Berg Eiendomsinvest AS | Real estate | 2019 |
| Berg Og Fosshaug AS | Real estate | 2018 |
| Bergan & Hatland Holding AS | Wholesale & retail | 2023 |
| Berge Design AS | Professional & scientific | 2024 |
| Berger Utvikling AS | Real estate | 2003 |
| Bergh Eiendom AS | Real estate | 2018 |
| Bergh's Bil Og Karosseri AS | Wholesale & retail | 2015 |
| Berghjoh Eiendom AS | Real estate | 2026 |
| Berglia AS | Construction | 1991 |
| Berglia Kart Og Bok AS | Information & communication | 2021 |
| BETONGTETTER1 AS | Construction | 2007 |
| Betongting AS | Manufacturing | 2023 |
| Betongveien 9 AS | Real estate | 2022 |
| Better Advice Group AS | Professional & scientific | 2020 |