| 3 G Bygg AS | Construction | 2019 |
| 3B Norge AS | Real estate | 2016 |
| 3F Brannvern AS | Wholesale & retail | 2005 |
| 3M Autosport AS | Wholesale & retail | 2019 |
| 7R Holding AS | | 2025 |
| 804 Holding AS | Financial services | 2024 |
| A-K Maskiner AS | Wholesale & retail | 1988 |
| Aadarsh Holdning AS | Real estate | 2017 |
| Abansias AS | Wholesale & retail | 2022 |
| Abendum AS | Information & communication | 2019 |
| Acaia Norway AS | Professional & scientific | 2023 |
| Active Process Solutions AS | Professional & scientific | 2024 |
| Adampro AS | Transport & logistics | 2025 |
| Adco Holding AS | | 2021 |
| Advokathuset Breivik AS | Professional & scientific | 2008 |
| Ah Norge AS | Wholesale & retail | 2025 |
| Air Cargo Logistics AS | Transport & logistics | 2014 |
| Air Management AS | Transport & logistics | 2021 |
| Aivi AS | Information & communication | 2018 |
| Aj Produkter AS | Wholesale & retail | 1982 |
| Akershus Auto AS | Wholesale & retail | 2005 |
| Akershus Auto Bilverksted AS | Other services | 1997 |
| Akershus Bygg & Håndtverkservice AS | Construction | 2016 |
| Akershusgartneren AS | Administrative & support | 2009 |
| Alai Holding AS | Information & communication | 2023 |
| Albeek AS | Wholesale & retail | 2023 |
| Alem Consult AS | Other services | 2024 |
| Alexa Acquico AS | | 2024 |
| Alexa Holding AS | Wholesale & retail | 2024 |
| Alliance Total Service 24 AS | Real estate | 2024 |
| Altius AS | Professional & scientific | 2013 |
| Alvheim Barnehage AS | Education | 2022 |
| Amc Transport AS | Transport & logistics | 2013 |
| Amg 2 Holding AS | | 2024 |
| Amiva AS | Education | 2025 |
| An Mur Og Bygg AS | Construction | 2022 |
| Anleggsgartner Henrik Helgesen AS | Administrative & support | 2013 |
| Arctic Experience Travel AS | Arts & recreation | 2020 |
| Ardor AS | Wholesale & retail | 2016 |
| Arfo Logistic Consulting AS | Professional & scientific | 2019 |
| Arif Invest AS | Hospitality | 2021 |
| Arjo Produkter AS | Wholesale & retail | 1990 |
| Arkademester AS | Wholesale & retail | 2026 |
| Arteid Eiendom AS | Real estate | 2016 |
| Arteid Gård AS | Real estate | 2014 |
| Arteid Gård Da | Agriculture & fishing | 2024 |
| Arteidmoen Vannverk SA | Water & waste | 1995 |
| AS Mul | Information & communication | 2023 |
| Askim Betongsaging AS | Construction | 1999 |
| Aspa Norge AS | Administrative & support | 2017 |
| Atheimr AS | Professional & scientific | 2023 |
| Attraktiv Forsikring AS | Financial services | 2010 |
| Auror AS | Wholesale & retail | 2025 |
| Aurstad Landbruk AS | Agriculture & fishing | 2021 |
| Austad Bredde AS | Manufacturing | 2023 |
| Auto Vista AS | Wholesale & retail | 2026 |
| Autocomponents AS | Wholesale & retail | 2017 |
| Autorada AS | Wholesale & retail | 2019 |
| Autoscale AS | Information & communication | 2013 |
| Axa Bygg AS | Wholesale & retail | 2019 |
| Axabygg AS | Construction | 2026 |
| Axelsens Transport Ans | Transport & logistics | 1991 |
| Axis Solutions AS | Administrative & support | 2024 |
| B B Invest AS | Real estate | 2013 |
| B2B Service AS | Professional & scientific | 2025 |
| B2BTJENESTEN.NO AS | Wholesale & retail | 2020 |
| Bac Gruppen AS | Information & communication | 2018 |
| Backe Romerike AS | Construction | 1983 |
| Bakkedalen Fus Barnehage AS | Education | 2018 |
| Balder Bulk AS | Transport & logistics | 2015 |
| Bani Eiendom AS | Real estate | 2019 |
| Bani Renhold AS | Administrative & support | 2004 |
| Bapartner AS | Administrative & support | 2026 |
| Bashkim Invest AS | | 2022 |
| Belind AS | | 2021 |
| Bergan Kapital AS | | 2026 |
| Bergems Graveservice AS | Construction | 1996 |
| Berthelsen Bil Og Karosseri AS | Other services | 2017 |
| Betongmann AS | Construction | 1988 |
| BFG AS | Wholesale & retail | 2021 |
| Bike Expo AS | Arts & recreation | 2017 |
| Bil 123 AS | Wholesale & retail | 2025 |
| Bilkomponenter AS | Wholesale & retail | 2020 |
| Bimmerfiks AS | Other services | 2019 |
| Birgit Og Dan Holms Eiendommer AS | Real estate | 1986 |
| Boligtaksering Oslo & Akershus AS | Professional & scientific | 2012 |
| Borgen Eiendomsutvikling AS | | 2014 |
| Borgen Fus Barnehage AS | Education | 2018 |
| Borgen Maskin AS | Wholesale & retail | 2026 |
| Borgos Foto AS | Professional & scientific | 1992 |
| Borgvikauto AS | Wholesale & retail | 2025 |
| Bowltech Norway AS | Wholesale & retail | 2014 |
| BSH Eiendom AS | Real estate | 2008 |
| Bt-M Holding AS | Financial services | 2017 |
| Bygg Renovasjon Og VVS AS | Construction | 2019 |
| Byggtec AS | Construction | 2024 |
| C-Hamoud AS | | 2025 |
| Cab Tech AS | Other services | 2024 |
| Caballo AS | | 2020 |
| Capco AS | Professional & scientific | 2012 |