| 3. Steinleggere Oslo Da | Construction | 2006 |
| A & A Transport og Service DA | Construction | 1987 |
| A Takst AS | Real estate | 2024 |
| A&A Holding AS | Construction | 2005 |
| A&J Holding AS | | 2020 |
| Aaj Holding AS | | 2023 |
| Absolute Afghan AS | Agriculture & fishing | 2019 |
| Agility Loftet AS | Real estate | 2025 |
| Ahd AS | Real estate | 2013 |
| Aircraft Engineering AS | Manufacturing | 1996 |
| Aldas Bygg AS | Construction | 2016 |
| Alfakrølle Invest AS | Financial services | 2018 |
| All Dogs AS | Agriculture & fishing | 2023 |
| Alp Eiendom AS | Real estate | 2001 |
| Alp Holding AS | | 2005 |
| Alra Etonor AS | Professional & scientific | 2025 |
| Amentis AS | Information & communication | 2026 |
| Amundsen Bøker AS | Wholesale & retail | 2025 |
| Ankalars AS | Administrative & support | 2022 |
| Aom Bobil Og Caravanservice AS | Wholesale & retail | 2026 |
| Apinor AS | Wholesale & retail | 2018 |
| Apollon Import AS | Wholesale & retail | 2021 |
| Arco Entreprenør AS | Construction | 1991 |
| Are Eiendom AS | Real estate | 2006 |
| Arvenor AS | Wholesale & retail | 2026 |
| AS Nor-Trapp | Manufacturing | 1972 |
| AS RSH Eiendom | Real estate | 1919 |
| Ask Agro Da | Agriculture & fishing | 2026 |
| Ask Nordic AS | Real estate | 2025 |
| Ask-Eiendom AS | | 2022 |
| Asknor AS | Real estate | 2025 |
| Atlas Pe AS | Wholesale & retail | 2022 |
| August Norge AS | Wholesale & retail | 2010 |
| Aurveien 14 AS | Real estate | 2012 |
| Aurveien 18 AS | Real estate | 2025 |
| Auto Tech-Sport AS | Other services | 2022 |
| Autosenteret Langhus AS | | 2006 |
| Axitech AS | Real estate | 2023 |
| B/R Eiendom AS | Construction | 2023 |
| B/R Energi AS | Construction | 2019 |
| Bauta Consult AS | Professional & scientific | 2016 |
| Bea Mek Verksted AS | Manufacturing | 2008 |
| Bedriftsveien 12 AS | Real estate | 2024 |
| Bekkevold Utvikling AS | Real estate | 2017 |
| Berg Eiendom Holding AS | Real estate | 2013 |
| Bergfast Invest AS | Arts & recreation | 2009 |
| Best Pris AS | Wholesale & retail | 2005 |
| Best Recovery AS | Transport & logistics | 2018 |
| BF Bobilservice AS | Other services | 2021 |
| BG Gruppen AS | | 2021 |
| BHL Holding AS | Real estate | 2015 |
| Bikeport Europe AS | Wholesale & retail | 2025 |
| Biocontrol AS | Manufacturing | 1991 |
| Bison AS | Real estate | 2021 |
| Bjørk Hønseri Da | Agriculture & fishing | 2003 |
| Bjørnstad Bygg AS | Construction | 2006 |
| Bjørnstad Bygg Eiendom AS | Real estate | 2013 |
| Bjørnstad Bygg Utvikling AS | Real estate | 2016 |
| Blikkenslager Frode J. Kristiansen AS | Construction | 2004 |
| Blizzard Holdings AS | Real estate | 2024 |
| Blomster Flora AS | Wholesale & retail | 2021 |
| Blomster Flora Rakkestad AS | Wholesale & retail | 2025 |
| Bobil Og Fritid AS | Wholesale & retail | 2020 |
| Boger Bygg AS | Construction | 2019 |
| Bondebrød Bakeri Og Konditori AS | Manufacturing | 2015 |
| Bov AS | Construction | 2008 |
| Brandkassegården AS | Real estate | 2015 |
| Brannkontroll Norge AS | Professional & scientific | 2023 |
| Bredholtveien 240 AS | Real estate | 2018 |
| BRH 2 Holding AS | Other services | 2011 |
| Brk-Holding AS | | 2026 |
| Brodahl Eiendom AS | Real estate | 2012 |
| Bråtenes AS | | 2019 |
| Bråthen Maskinstasjon AS | Transport & logistics | 2007 |
| Brødrene Haaby AS | Wholesale & retail | 2022 |
| Brødrene Haaby Eiendom AS | Real estate | 2007 |
| Brødrene Haugaard Eiendom AS | Real estate | 2015 |
| Brødrene Ringstad AS | Manufacturing | 2002 |
| BS Montasje AS | Professional & scientific | 2004 |
| Buer Investering AS | | 2020 |
| Buerbakkene AS | | 2023 |
| Bunnefjorden Eiendom AS | Real estate | 2011 |
| Bye Kro & Vertshus AS | Hospitality | 1988 |
| Byemark Eiendom AS | Construction | 1987 |
| Byemark Holding AS | Construction | 2019 |
| Byemark Stål AS | Construction | 2019 |
| Bygdelegene Da | Health & social care | 2004 |
| Bygg Teknisk Eiendom AS | Real estate | 1992 |
| Bygg Teknisk Stål AS | Manufacturing | 1998 |
| Byggservice AS | Construction | 2023 |
| Bøhn Anlegg AS | Construction | 2026 |
| Bøhn Holding AS | | 2026 |
| Bøhn Invest Ans | Agriculture & fishing | 2010 |
| Bøl Holding AS | Real estate | 2016 |
| Børkes AS | Real estate | 2025 |
| C-Lundeby Invest AS | | 2020 |
| Casa Carolina AS | Manufacturing | 2008 |
| Casa De Motos AS | Wholesale & retail | 2025 |
| Cashflowkongs & Comrades AS | Wholesale & retail | 2021 |
| Cavatappi AS | Wholesale & retail | 2023 |