| Breffni Air (Norway) AS | Construction | 2024 |
| Breganor AS | Professional & scientific | 2017 |
| Bregox AS | | 2024 |
| Breheimen Event AS | Hospitality | 2024 |
| Breiangen AS | Real estate | 1990 |
| Breiangen Eiendom AS | Real estate | 2011 |
| Breibukt AS | Professional & scientific | 2005 |
| Breibukt Finans AS | | 2023 |
| Breibukt Holding AS | Real estate | 2006 |
| Breibukt Ullensaker AS | Real estate | 2018 |
| Breidablikk Eiendom AS | Real estate | 2005 |
| Breien + Boasson Arkitekter AS | Professional & scientific | 2025 |
| Breiflabb AS | | 2023 |
| Breifonn AS | Real estate | 2003 |
| Breigata 10 AS | Real estate | 2014 |
| Breili Holding AS | | 2026 |
| Breiliveien 41 AS | Real estate | 2007 |
| Breiseth Invest AS | Financial services | 2005 |
| Breisnes Holding AS | Financial services | 2005 |
| Breiså AS | Professional & scientific | 2019 |
| Breive Holding AS | | 2020 |
| Breive Utvikling AS | Real estate | 2020 |
| Breivik Invest AS | Financial services | 2007 |
| Breivika Vann- Og Avløpslag SA | Water & waste | 2020 |
| Breivikelva Kraft AS | Energy | 2020 |
| Breiviken 5 AS | Real estate | 2019 |
| Breivikgården AS | Real estate | 2003 |
| Breiviksbakken 1A AS | Real estate | 2020 |
| Breiviksbakken 1B AS | Real estate | 2018 |
| Breiviksenteret AS | Real estate | 2001 |
| Breivikveien 48 AS | Real estate | 2004 |
| Breivold Energi AS | Energy | 1999 |
| Breivoll Eiendom AS | Real estate | 2016 |
| Breivollbyen Eiendom AS | Real estate | 2024 |
| Breivollbyen Holding AS | Real estate | 2017 |
| Breivollveien Eiendom AS | Other services | 2007 |
| Brekke & Strand Akustikk AS | Professional & scientific | 2016 |
| Brekke & Strand Holding AS | Professional & scientific | 2016 |
| Brekke Holding AS | Financial services | 1990 |
| Brekke Retail Consulting AS | Professional & scientific | 2021 |
| Brekkefossen Kraftverk AS | Energy | 2008 |
| Brekkeseter Holding AS | Real estate | 2021 |
| Brekkeveien 19 Utvikling AS | Real estate | 2019 |
| Brekkeveien Bolig AS | Real estate | 2024 |
| Brekstad Næring Eiendom AS | Real estate | 2017 |
| Brelin AS | | 2006 |
| Brem Eiendom AS | Real estate | 2026 |
| Bremedia Da | Professional & scientific | 2005 |
| Bremer Holding AS | Financial services | 2008 |
| Bremer Konow Group AS | Professional & scientific | 2023 |
| Bremnes Vekstheim AS | Administrative & support | 2024 |
| Bremont AS | Professional & scientific | 2021 |
| Bremvik Invest AS | Professional & scientific | 2012 |
| Brendehaug Holding AS | | 2025 |
| Brenden-Invest AS | | 2022 |
| Breng Holding AS | | 2019 |
| Brenibba AS | | 2024 |
| Brenier AS | | 2025 |
| Brenksmid AS | | 2025 |
| Brenn Alt AS | Arts & recreation | 2025 |
| Brenna-Årvik Holding AS | Real estate | 2019 |
| Brennabakken AS | Real estate | 2019 |
| Brennaholding AS | | 2024 |
| Brennastubben Familiebarnehage AS | Education | 2006 |
| Brennaveien 122 AS | Real estate | 2011 |
| Brennaveien 16 AS | Real estate | 2014 |
| Brennaveien 18 Invest AS | Real estate | 2004 |
| Brennaveien 20B Holding AS | Real estate | 2020 |
| Brennaveien Eiendom AS | Real estate | 2014 |
| Brennbakkan Invest AS | | 2024 |
| Brenne Invest AS | Transport & logistics | 2014 |
| Brennebu II AS | Real estate | 2014 |
| Brennebu III AS | Real estate | 2014 |
| Brennemoen Eiendom AS | Real estate | 2008 |
| Brennemoen Hotel Eiendom AS | Real estate | 2017 |
| Brenner AS | Wholesale & retail | 2023 |
| Brenneriveien 11 AS | Real estate | 2023 |
| Brenneriveien 5 AS | Real estate | 2009 |
| Brenneriveien 7 Drift AS | | 2011 |
| Brenneriveien 9 AS | Real estate | 1996 |
| Brenneriveien Jazzhus AS | Arts & recreation | 1997 |
| Brennevinasa Limited Nuf | Wholesale & retail | 2026 |
| Brennholm Invest AS | | 2018 |
| Brenni Invest AS | Real estate | 2026 |
| Brennstrøm Consult AS | Professional & scientific | 2021 |
| Brenntinden AS | Real estate | 2023 |
| Brennvelt Invest AS | | 2024 |
| Brennåsen Handelseiendom AS | Real estate | 1997 |
| Brent AS | Information & communication | 2023 |
| Brente Bruk AS | Financial services | 2005 |
| Breor Eiendom AS | Real estate | 2009 |
| Bret Holding AS | Real estate | 2005 |
| Brette AS | Professional & scientific | 2023 |
| Bretteville AS | Professional & scientific | 2020 |
| Bretteville Holding AS | | 2026 |
| Brettspilleksperten AS | Wholesale & retail | 2014 |
| Breut Media AS | Professional & scientific | 2022 |
| Brevik Invest AS | Financial services | 2017 |
| Brevik Torg AS | Real estate | 2009 |
| Brevikveien 30 B AS | Real estate | 2021 |