| 5XT Holding AS | | 2023 |
| 67 Invest AS | Real estate | 2022 |
| A Nilsson & Co AS | Wholesale & retail | 1967 |
| A.G.Tree AS | Construction | 2025 |
| Aa-Team AS | Professional & scientific | 2015 |
| Aamodt Stressmestring AS | Health & social care | 2023 |
| Act-Now AS | Professional & scientific | 2011 |
| Adams Eiendom AS | Real estate | 2006 |
| Adams Express Holding AS | Transport & logistics | 2023 |
| Adams Langhus AS | Real estate | 2014 |
| Adams Vestby AS | Real estate | 2014 |
| Add Media AS | Professional & scientific | 2008 |
| Adrenalina AS | Agriculture & fishing | 2021 |
| Adrenalina Holding AS | Agriculture & fishing | 2022 |
| Afro Salong AS | Other services | 2025 |
| Aj Shared Services AS | Professional & scientific | 2024 |
| Ak Entreprenør AS | Professional & scientific | 2022 |
| Ak Invest Viken AS | Construction | 2020 |
| Ak Prosjekt AS | Construction | 2024 |
| Akkurat Profil AS | Professional & scientific | 2011 |
| Akuttmedisin AS | Education | 2024 |
| Alcamo AS | Construction | 2009 |
| Alf Andersen AS | Transport & logistics | 1974 |
| Alfa Electro AS | Professional & scientific | 2007 |
| Alumian AS | Information & communication | 2023 |
| Am Unik AS | Construction | 2020 |
| Anette Beck AS | Financial services | 2011 |
| Anlu AS | Construction | 2024 |
| Ararat Restaurant Bar AS | Hospitality | 2016 |
| Arbeidskameraten AS | Administrative & support | 2012 |
| Arena Invest AS | | 2025 |
| Arenadrift AS | Arts & recreation | 2025 |
| Argus Consulting AS | Professional & scientific | 2024 |
| Arild Moe Transport Og Graveservice AS | Construction | 2005 |
| Ark Eiendom AS | Manufacturing | 1970 |
| Ark Holding AS | Manufacturing | 1996 |
| Ark Trykk AS | Manufacturing | 1988 |
| Arm AS | Real estate | 2019 |
| AS Adams Express | Transport & logistics | 1988 |
| AS Cameri | Professional & scientific | 2023 |
| AS Solheim Reklame | Manufacturing | 1968 |
| Asak Entreprenør AS | Construction | 2026 |
| Asterisk Digital AS | Information & communication | 2025 |
| Atlas Copco Rock Drills AB | Wholesale & retail | 1997 |
| Austvold Shipping AS | Transport & logistics | 2006 |
| Azien Sushi AS | Hospitality | 2022 |
| Armaturjonsson AS | Wholesale & retail | 1978 |
| B.A.Wiik Holding AS | Real estate | 2013 |
| B.D Service AS | Construction | 2022 |
| B2B Partner AS | Arts & recreation | 2008 |
| Bano Life AS | Wholesale & retail | 1999 |
| Beathe Og Olav AS | Professional & scientific | 2007 |
| Beck Eiendom AS | Real estate | 2010 |
| Beck Maskin AS | Wholesale & retail | 2007 |
| Beck Maskinutleie AS | Administrative & support | 2018 |
| Beck to Business AS | | 2023 |
| Beck to the Future AS | | 2023 |
| Bedriftsassistenten AS | Professional & scientific | 2022 |
| Beijer Ref Support Norway AS | Wholesale & retail | 2009 |
| Belron Solutions AS | Administrative & support | 2017 |
| Berghagan 3 AS | Real estate | 2008 |
| Berghagan Bil AS | Other services | 1999 |
| Bergner Holding AS | | 2025 |
| Bergom AS | | 2005 |
| Best Next Invest AS | Financial services | 2005 |
| Best Price Blomster Da | Wholesale & retail | 2006 |
| Best På Bygg AS | Construction | 2025 |
| Betonma Rehabilitering AS | Construction | 2016 |
| Bien RR AS | Professional & scientific | 2018 |
| Bil Styling AS | Wholesale & retail | 2014 |
| Bipa Holding AS | | 2023 |
| Bjerkehageveien Service Og Vedlikehold Ans | Administrative & support | 2009 |
| Bjørka Kapital AS | Other services | 2005 |
| Bjørndal VVS AS | Construction | 2011 |
| Bjørvika Eiendom AS | Real estate | 2018 |
| BMC Invest Ltd Nuf | Information & communication | 2005 |
| Bom-Bom AS | Information & communication | 2021 |
| Bommelom AS | Information & communication | 2017 |
| Bondkall Eiendom AS | Real estate | 2021 |
| Boogietime AS | Administrative & support | 2013 |
| Bosch Rexroth AS | Wholesale & retail | 1964 |
| BR Holding Langhus AS | Professional & scientific | 2019 |
| Bra Entreprenør AS | Construction | 2024 |
| Bracon Invest AS | Professional & scientific | 2020 |
| Brannforebyggende AS | Professional & scientific | 2023 |
| Brewery Cash & Carry AS | Hospitality | 2015 |
| Brewery International AS | Wholesale & retail | 2021 |
| Bris Facility AS | Administrative & support | 2025 |
| Brisko Invest AS | Financial services | 2005 |
| Bruun Production AS | Arts & recreation | 2024 |
| BSK Consulting & Investment AS | | 2021 |
| BSS Byggeservice AS | Construction | 2010 |
| Bustetrollet Frisør AS | Other services | 2015 |
| Bustetrollet Frisør Bøleråsen AS | Other services | 2016 |
| Bygg & Bad AS | Construction | 2021 |
| Byggmester Jonassen AS | Construction | 2020 |
| Byparken Eiendom AS | Real estate | 2015 |
| Berggård Amundsen & Co AS | Wholesale & retail | 1986 |
| Bøkely Holding AS | Wholesale & retail | 2017 |
| Bøleråsen AS | Professional & scientific | 2021 |