| 120PLUS AS | Health & social care | 2022 |
| A R Construction AS | Construction | 2019 |
| A-Service AS | Administrative & support | 1991 |
| Aa Økonomisk Rådgivning AS | Professional & scientific | 2026 |
| Admaniha AS | Real estate | 2006 |
| Afossum AS | | 2022 |
| Aggero Holding AS | | 2025 |
| Agia Invest AS | Hospitality | 2005 |
| Aha Ventures AS | Information & communication | 2026 |
| Albus AS | | 2010 |
| Alefa AS | | 2021 |
| Alenvest AS | Information & communication | 2017 |
| Alpaca Invest AS | Information & communication | 2017 |
| Alpha Invest AS | Hospitality | 2011 |
| Alpha Panorama AS | Real estate | 2014 |
| Alvimveien 61 AS | Real estate | 2016 |
| Amandus Invest AS | | 2020 |
| Ammatoka AS | Arts & recreation | 2021 |
| Amorosa AS | Wholesale & retail | 2013 |
| Anconiastra AS | Real estate | 2005 |
| Andreas Hafver Invest AS | | 2026 |
| Andreastua AS | Real estate | 1997 |
| Anleggsgartner Eiken & Sønn AS | Administrative & support | 1997 |
| Anlin 490 Holding AS | | 2023 |
| Anne Mari Gullikstad AS | Financial services | 2016 |
| Aorta AS | | 2023 |
| Araya Dagligvare AS | Wholesale & retail | 2026 |
| Arctander Eftf. AS | Real estate | 2006 |
| Arctic Cloud Consulting AS | Information & communication | 2015 |
| Arkhage AS | | 2025 |
| Arne Bendiksen Records AS | Information & communication | 1983 |
| Arnemann AS | | 2022 |
| AS Aksjebingen | Financial services | 2017 |
| Asker Auto AS | Wholesale & retail | 2021 |
| Asker MC Senter Ans | Wholesale & retail | 2005 |
| Asker Og Bærum Tour AS | Transport & logistics | 1998 |
| Asker Teknologipark Ans | Real estate | 1988 |
| Asker Yoga Shala AS | Arts & recreation | 2020 |
| Askerbøringen Da | Information & communication | 1990 |
| Aubergine AS | Health & social care | 2017 |
| Aurelia AS | Real estate | 1970 |
| Autek Holding AS | | 2005 |
| AUTO11 AS | Wholesale & retail | 2015 |
| Azara AS | Wholesale & retail | 2026 |
| B & F Byggservice AS | Construction | 2022 |
| B.I.T. AS | Information & communication | 2020 |
| Baias AS | Financial services | 2014 |
| Baker Østbys Vei 1 AS | Real estate | 2005 |
| Bakken & Company AS | Wholesale & retail | 2025 |
| Baltazar Invest AS | | 2022 |
| Baluba Kapital AS | Real estate | 2020 |
| Baros Seafood AS | | 2019 |
| Barton Håndverk AS | Wholesale & retail | 2022 |
| Bda Bygg AS | Construction | 2022 |
| Bda Grupp AS | Construction | 2025 |
| Becker Holding AS | Real estate | 2016 |
| Bekkelund Gård & Keramikk AS | Manufacturing | 2020 |
| Bell Økonomi AS | Professional & scientific | 2015 |
| Bellini of Norway AS | Wholesale & retail | 1989 |
| Bespoke Valdimarsson Ans | Wholesale & retail | 2022 |
| Betterment AS | Construction | 2020 |
| Bilekspert Benny Christensen Da | Arts & recreation | 2025 |
| Bing AS | Information & communication | 2018 |
| Bjerke Eiendom AS | Real estate | 1999 |
| Bjerkås Eiendom AS | Real estate | 1998 |
| Bjjo Holding AS | | 2019 |
| Bjørn Kveim AS | Wholesale & retail | 2005 |
| Bjørn Norlie 2 AS | Real estate | 1998 |
| Bjørndal & Co Ans | Health & social care | 2025 |
| Blåhytta AS | Financial services | 2005 |
| Bofelleskapet Askervangen Hus a SA | Real estate | 2025 |
| Borch Invest AS | Real estate | 2019 |
| Borcon AS | Professional & scientific | 2017 |
| Braathens AS | Real estate | 2015 |
| Brasil Service AS | | 2008 |
| Brdr Devold Soknes Da | Wholesale & retail | 2003 |
| Bringebærhagen 1 AS | Real estate | 2021 |
| Bringebærhagen Eiendom AS | Health & social care | 2016 |
| Bringebærhagen Veilag SA | Real estate | 2015 |
| Broholm Executive AS | Professional & scientific | 2019 |
| Bronte Invest AS | | 2020 |
| Bråthen Murservice AS | Construction | 2007 |
| Bukta Mat Og Vin AS | Hospitality | 2019 |
| Bwas Eiendom AS | Real estate | 2013 |
| Bwas Group AS | Professional & scientific | 1998 |
| BWS Invest AS | | 2025 |
| Byggelit Sverige AB | Administrative & support | 2001 |
| Båtplasser Vollen AS | Real estate | 2005 |
| Cac Holdings AS | | 2020 |
| Calamo Invest AS | Real estate | 2020 |
| Calibre Project AS | Professional & scientific | 2024 |
| Cama Venture Ltd Nuf | Professional & scientific | 2010 |
| Camvecti Holding AS | Real estate | 2015 |
| Cargopartner AS | Transport & logistics | 2023 |
| Casoli AS | | 2023 |
| Caspari Holding AS | | 2025 |
| Cast Group AS | Arts & recreation | 2015 |
| Celmag AS | | 2019 |
| Chic & Brukt Da | Wholesale & retail | 2006 |
| Christ Eiendom AS | Real estate | 2019 |