| BOP4 AS | Real estate | 2019 |
| BOP5 AS | Real estate | 2019 |
| Borgar Haugland Eiendom AS | Real estate | 1998 |
| Borgen Hus AS | Real estate | 2024 |
| Borgmuren AS | Real estate | 2004 |
| Borheia Næringspark AS | Real estate | 2011 |
| Borkedalen AS | Real estate | 2019 |
| Borning Invest AS | Wholesale & retail | 2008 |
| Borondi AS | Professional & scientific | 2012 |
| Bortelid 2 AS | Real estate | 2021 |
| Bortelid 4 AS | Real estate | 2012 |
| Bortelid AS | Real estate | 2020 |
| Bortelidtunet AS | Real estate | 2002 |
| Borz AS | Wholesale & retail | 2026 |
| Borz Company AS | Wholesale & retail | 2025 |
| Bosmyr Industribygg AS | Real estate | 2004 |
| Boss Industri Og Mek Verksted AS | Manufacturing | 1981 |
| Boston Group AS | Wholesale & retail | 2003 |
| Bosør Utvikling AS | Real estate | 2003 |
| Bow Holding AS | | 2020 |
| Box Concept AS | | 2021 |
| BP Bil AS | Wholesale & retail | 2016 |
| BP Bygg AS | Construction | 2025 |
| BPM Productions AS | Information & communication | 2010 |
| BPP AS | Real estate | 2020 |
| BR Bygg Og Mal AS | Construction | 2019 |
| Braak AS | Information & communication | 2021 |
| Brabo Sør AS | Administrative & support | 2011 |
| Bracen Invest AS | Real estate | 2009 |
| Brackenridge Offshore AS | Professional & scientific | 2021 |
| Bragd Eiendom AS | Real estate | 2024 |
| Bragdø Invest AS | Real estate | 1978 |
| Bragdøen AS | Real estate | 2011 |
| Bragilt AS | Real estate | 1986 |
| Brain Camp AS | Health & social care | 2020 |
| Braingames Invest AS | Administrative & support | 2016 |
| Brams AS | | 2024 |
| Branchmen Da | Wholesale & retail | 2018 |
| Brandal Holdings AS | | 2023 |
| Brandsdal Eiendom AS | Real estate | 2012 |
| Brandsdal Group AS | Wholesale & retail | 2004 |
| Brandsdal Holding AS | Wholesale & retail | 2020 |
| Brandsdal Invest AS | Wholesale & retail | 2020 |
| Brandsdal Logistikk AS | Wholesale & retail | 2014 |
| Brandsign AS | Professional & scientific | 2026 |
| Brandsrud Power AS | Wholesale & retail | 2025 |
| Brannrådgivning AS | Professional & scientific | 2020 |
| Brassen Invest AS | | 2019 |
| Brauer Holding AS | Health & social care | 2023 |
| Bravo Live AS | Professional & scientific | 2021 |
| BRD AS | Real estate | 2018 |
| Brdr Bragdø AS | Construction | 2005 |
| Bredalsholmen Eiendom AS | Real estate | 1974 |
| Breen Og Minde Eiendomsinvest AS | Real estate | 2018 |
| Breistein Invest AS | | 2005 |
| Breive AS | Real estate | 2006 |
| Brekka Ribe AS | Real estate | 2023 |
| Brems Invest AS | Real estate | 2014 |
| Bremsa Holding AS | Real estate | 2006 |
| Brendeskaret AS | Real estate | 2005 |
| Brenerich Joerg | Manufacturing | 2000 |
| Brenne Konsult AS | Professional & scientific | 2005 |
| BRG AS | Real estate | 2008 |
| BRG Bolig AS | Real estate | 2019 |
| BRG Eiendom AS | Real estate | 2008 |
| BRG Entreprenør AS | Construction | 2008 |
| BRG Holdco AS | Construction | 2022 |
| BRG Holding AS | Real estate | 2014 |
| BRG Invest AS | Construction | 2014 |
| BRG Midco AS | Construction | 2018 |
| BRG Utvikling AS | Real estate | 2015 |
| Brickstep AS | | 2025 |
| Briller Og Iris AS | Wholesale & retail | 2022 |
| Bris Invest AS | Real estate | 2005 |
| Bris Utvikling AS | Wholesale & retail | 1983 |
| Bristol Holding AS | Financial services | 2005 |
| Brivato AS | Real estate | 2023 |
| Brks Holding AS | | 2011 |
| Brntech AS | Professional & scientific | 2022 |
| Broderi Sør AS | Manufacturing | 2025 |
| Brogaten 9 AS | Real estate | 2000 |
| Brokke Hyttepark AS | Real estate | 2009 |
| Brokke Høyfjell AS | Real estate | 2007 |
| Brokkeutleie Ans | Real estate | 2005 |
| Brothers in Food AS | Hospitality | 2026 |
| Brouwer Production AS | Information & communication | 2025 |
| Broveien 2 AS | Real estate | 2013 |
| BRT AS | | 2025 |
| Brukerblikk AS | Information & communication | 2018 |
| Bruktbiler AS | Wholesale & retail | 2021 |
| Brumlebarn AS | Wholesale & retail | 2014 |
| Brunborg Invest AS | | 2021 |
| Brunet Smør AS | | 2025 |
| Brunvand AS | Hospitality | 2009 |
| Brut AS | | 2025 |
| Bryggelia Invest AS | Real estate | 2019 |
| Bryggeloftet Fysioterapi AS | Health & social care | 2017 |
| Bryggen Bergen AS | Hospitality | 2022 |
| Bryggen Invest Sør AS | Arts & recreation | 2007 |
| Bryhni Invest AS | Professional & scientific | 2005 |