| Breidablikkveien Eiendom AS | Real estate | 2016 |
| Breie AS | | 2026 |
| Breifonn Utvikling AS | Professional & scientific | 2006 |
| Breigata 21 AS | Real estate | 2025 |
| Breigata 25 AS | Real estate | 2024 |
| Breigata 8 AS | Real estate | 1997 |
| Breitorget AS | Real estate | 2008 |
| Breitorget Holding AS | Real estate | 2024 |
| Brekke Larsen AS | Financial services | 2005 |
| Brekne Invest AS | | 2022 |
| Brent Holding AS | Information & communication | 2012 |
| Bresapedla AS | Manufacturing | 2017 |
| Brexit AS | Hospitality | 2025 |
| Brgt Consulting AS | Professional & scientific | 2021 |
| Brian Boru Stavanger AS | Hospitality | 2023 |
| Bricksoft Solutions AS | Information & communication | 2015 |
| Bridge Energy AS | | 2025 |
| Bridge Energy Holding AS | Financial services | 2024 |
| Bridge International AS | Professional & scientific | 2024 |
| Bridgeland AS | Professional & scientific | 2022 |
| Brikks Consulting AS | Professional & scientific | 2025 |
| Brilleslangen AS | Wholesale & retail | 2013 |
| Brilliant Investment AS | Administrative & support | 2024 |
| Brilliant Renhold AS | Administrative & support | 2019 |
| Brilly AS | | 2021 |
| Brimsø Consulting AS | Professional & scientific | 2012 |
| Bringebaer Invest AS | | 2020 |
| Bringebærbruket AS | Agriculture & fishing | 2018 |
| Bringedal Eiendom AS | Real estate | 1996 |
| Bringinvest AS | Real estate | 2006 |
| Bris Forlag AS | Information & communication | 2009 |
| Brisen Kapital AS | Real estate | 2019 |
| Brisling AS | Manufacturing | 2026 |
| Britec Holding AS | | 2022 |
| Brix Auto AS | Wholesale & retail | 2026 |
| Brixen Holding AS | | 2023 |
| Broadway 13 AS | Real estate | 2009 |
| Broken Fork AS | Hospitality | 2012 |
| Brommwill AS | Administrative & support | 1994 |
| Brotan Holding AS | Health & social care | 2017 |
| Brow Studio Norway AS | Other services | 2019 |
| Brown Holding AS | | 2023 |
| Bru Holding AS | Health & social care | 2021 |
| Brudesalongen I Stavanger AS | Wholesale & retail | 2005 |
| Brugg Norge AS | Professional & scientific | 2025 |
| Bruktbil Vest AS | Wholesale & retail | 2022 |
| Brumle Technology AS | Professional & scientific | 2017 |
| Brune Holding 1 AS | Financial services | 2007 |
| Brunel Energy Norge AS | Professional & scientific | 2008 |
| Brustadbua AS | Wholesale & retail | 2003 |
| Bryggen Frisør AS | Other services | 1997 |
| Bryggene AS | Real estate | 2022 |
| Bryn Eiendom Ans | Real estate | 1989 |
| Bryne Taxisentral SA | Transport & logistics | 2003 |
| Bryneporten AS | Real estate | 2004 |
| Brynes Planter AS | Wholesale & retail | 2020 |
| Brynes Planteskoler AS | Wholesale & retail | 1988 |
| Brynesenteret AS | Real estate | 2000 |
| Brødregata 7 AS | Real estate | 2001 |
| Brødrene Anderssen Da | Construction | 1993 |
| Brødrene Bie AS | Real estate | 2025 |
| Brødrene Bie II Ans | Real estate | 2005 |
| Brødrene Eriksen Da | Agriculture & fishing | 1995 |
| Brødrene Fevangs Barberstue AS | Other services | 2011 |
| Brødrene Kverneland AS | Professional & scientific | 2013 |
| Brødrene Kverneland Invest AS | Administrative & support | 2015 |
| Brødrene Pedersen AS | Wholesale & retail | 1986 |
| Brødrene Torjussen AS | Construction | 1997 |
| Brødrene Torjussen Eiendom AS | Real estate | 1972 |
| BS Eiendom AS | Real estate | 1988 |
| BS Finans AS | Wholesale & retail | 2007 |
| BSD Capital AS | | 2024 |
| Bse Eiendom AS | Real estate | 1990 |
| BT Fasade AS | Construction | 2009 |
| BT Investering AS | Professional & scientific | 2016 |
| Btjenester AS | Professional & scientific | 2021 |
| Btov Invest AS | Financial services | 2014 |
| BTV Consulting Vanvik AS | Administrative & support | 2014 |
| Bubblebot AS | Wholesale & retail | 2023 |
| Buch Investering AS | Real estate | 2026 |
| Buch Optikk AS | Wholesale & retail | 1979 |
| Budbilsentralen AS | Transport & logistics | 2017 |
| Budbilsentralen Drift AS | Transport & logistics | 2024 |
| Bugge Aase Eiendom AS | Real estate | 1989 |
| Bugge Sport AS | Professional & scientific | 2018 |
| Buheien AS | | 2019 |
| Buildco AS | Wholesale & retail | 2024 |
| Bukina Invest Holding AS | | 2018 |
| Bukta Holding AS | Manufacturing | 2013 |
| Bull Finans AS | Financial services | 2022 |
| Bull Market AS | | 2026 |
| Bullock AS | Hospitality | 2012 |
| Bumbum AS | Other services | 2025 |
| Bunad Fredrik Nilsson AS | Manufacturing | 2024 |
| Bunadhuset AS | Wholesale & retail | 1998 |
| Burger Storhaug AS | Hospitality | 2025 |
| Business Online AS | Information & communication | 2008 |
| Busstek AS | Other services | 2019 |
| Busy Busy Bird AS | Professional & scientific | 2013 |
| Butikk 7114 Sjøhuset Ans | Wholesale & retail | 2007 |