| 3IDE-NORD AS | Professional & scientific | 2026 |
| A&H Grøterud Holding AS | Financial services | 2015 |
| A.F Halleland Holding AS | Financial services | 2014 |
| Account Regnskap AS | Professional & scientific | 2011 |
| Ae Trykk AS | Manufacturing | 2024 |
| Af Hæhre/Pnc Ans | Construction | 2019 |
| Afrodite Frisør AS | Other services | 2022 |
| Ak Båt Og Bil AS | Education | 1999 |
| Aktib Invest AS | Financial services | 2016 |
| Alaro AS | Real estate | 2014 |
| Alouette AS | | 2018 |
| Amend AS | Information & communication | 2022 |
| Andreas Bottolfs Sport AS | Wholesale & retail | 1996 |
| Andresen Akuttmedisin Og Beredskap AS | Education | 2022 |
| Ar Bygg AS | Real estate | 2020 |
| Arco Nor AS | Professional & scientific | 2006 |
| Asfaltfres AS | Construction | 2011 |
| Authentic AS | Professional & scientific | 2015 |
| B.V.T. AS | Agriculture & fishing | 2023 |
| B3 Solutions AS | Professional & scientific | 2023 |
| Backe Graverservice AS | Construction | 2025 |
| Bag Eiendom & Invest AS | Professional & scientific | 2013 |
| Bakkeseter Skog Ans | Agriculture & fishing | 1999 |
| Bal Service AS | Professional & scientific | 2023 |
| Bal Service Og Utleie AS | Manufacturing | 2025 |
| Barbroveien 7 AS | Real estate | 2025 |
| Becc Invest AS | | 2025 |
| Bergvilje AS | | 2020 |
| Bete Asfalt AS | Construction | 2024 |
| Bete Asfalt Holding AS | | 2024 |
| Bete Eiendom AS | Real estate | 2024 |
| BGH Arkitektur Og Design AS | | 2015 |
| Bilvaskeriet AS | Other services | 2022 |
| Bjertnæs Renovasjon AS | Water & waste | 2000 |
| Bjoretjernveien SA | Real estate | 2019 |
| Bjørkerud Holding AS | | 2022 |
| Bjørkeruud Utleie AS | Administrative & support | 2022 |
| BK Bygg&Eiendom AS | Construction | 2016 |
| BK Maskindrift Da | Agriculture & fishing | 2025 |
| Blå Bolig Vikersund AS | Manufacturing | 2024 |
| Blålys Eiendom AS | Real estate | 2023 |
| Borrelås.No AS | Wholesale & retail | 2024 |
| BR Bolig Vikersund AS | Real estate | 2017 |
| Brabuss AS | Administrative & support | 2025 |
| Brandtenborg Bygg Og Maskin AS | Construction | 2024 |
| Breiliveien SA | Real estate | 1965 |
| Brunes Grunneierlag SA | Real estate | 1975 |
| Brutus Invest Holding AS | Construction | 2021 |
| Brødr Løver AS | Wholesale & retail | 1999 |
| Brødr. Løver Eiendom AS | Real estate | 2006 |
| Buskerud Biobrensel Da | Manufacturing | 2003 |
| Buskerud Bolig Og Eiendomsutvikling AS | Real estate | 1998 |
| Buskerud Boligutvikling AS | Real estate | 2015 |
| Buskerud Bygg & Elektro AS | Construction | 2012 |
| Buskerud Bygg AS | Construction | 2025 |
| Buskerud Eiendom Og Utleie AS | Real estate | 2026 |
| Buskerud Olje AS | Wholesale & retail | 2009 |
| By Og Bygd AS | Construction | 2021 |
| Bygdeposten AS | Information & communication | 1979 |
| BYGG1 Eiendom AS | Real estate | 2026 |
| BYGG1 Vikersund AS | Construction | 2014 |
| Byggai AS | Wholesale & retail | 2024 |
| Byggmal AS | Construction | 2022 |
| Bygningsenergi AS | Professional & scientific | 2024 |
| Bøen Barnehage SA | Education | 1989 |
| Bønsnes Transport AS | Transport & logistics | 1998 |
| Caspersen Consult AS | Professional & scientific | 1983 |
| Caspersen Holding AS | Manufacturing | 2005 |
| Caspersens Trykkeri AS | Manufacturing | 1969 |
| Cato Ludvigsen Holding AS | Financial services | 2018 |
| CF Transport AS | Transport & logistics | 2017 |
| Christensen & Co AS | Professional & scientific | 2024 |
| Cobitek AS | Professional & scientific | 2019 |
| Communication Management AS | Information & communication | 2000 |
| Configure AS | Information & communication | 2025 |
| Cryovac AS | Professional & scientific | 2020 |
| Cu Solutions AS | Professional & scientific | 2018 |
| Cumulus Holding AS | Financial services | 2015 |
| Dalund Eiendom AS | Real estate | 2022 |
| Dalund Holding AS | Real estate | 2016 |
| Day One Investments AS | | 2021 |
| Deb Invest AS | | 2018 |
| Dekar Energi AS | Energy | 2026 |
| DIN STIL ANS Anne-Gro Olsen Hoveng og Grete Meuche. | | 1986 |
| Dravik AS | Real estate | 2017 |
| Drill & Blast Invest AS | | 2021 |
| Drolsum Vassverk | Water & waste | 1956 |
| Dronepartner AS | Wholesale & retail | 2024 |
| DRS Eiendom AS | Real estate | 2007 |
| DRS Invest AS | | 1983 |
| DV Rørservice AS | Construction | 2010 |
| E.Martinsen AS | Construction | 2024 |
| Eba Eiendom AS | Real estate | 2019 |
| Eba Service AS | Construction | 1988 |
| Echopulse AS | | 2023 |
| Eco-Fortuna AS | Professional & scientific | 2018 |
| Ect Invest AS | | 2026 |
| Eggum & Kirsebom AS | Professional & scientific | 1986 |
| Eho-Holding AS | | 2025 |
| Eiendomsselskapet Elektroveien 7 AS | | 1925 |