| Bjørnstjerne Produksjoner AS | Arts & recreation | 2026 |
| Bjørntvedt Gård AS | Real estate | 2012 |
| Bjørnveien 129 AS | Real estate | 2016 |
| Bjørnveien 83 AS | Real estate | 2015 |
| Bjørnveien AS | Real estate | 2011 |
| Bjørnvik Eiendom AS | Real estate | 2009 |
| Bjørnvold Invest AS | Real estate | 2006 |
| Bjørnådal Invest AS | Real estate | 2009 |
| Bjørshol Kapital AS | | 2025 |
| Bjørstad Utvikling AS | Real estate | 2021 |
| Bjørum Be Holdin' AS | | 2026 |
| Bjørum Trading AS | Real estate | 1965 |
| Bjørungs Invest AS | Real estate | 2007 |
| Bjørvika Apartments AS | Hospitality | 2012 |
| Bjørvika AS | Transport & logistics | 1998 |
| Bjørvika Bar Og Restaurantutvikling AS | Hospitality | 2013 |
| Bjørvika Bistro AS | Hospitality | 2018 |
| Bjørvika Blomster AS | Wholesale & retail | 2020 |
| Bjørvika City Apartments AS | Real estate | 2013 |
| Bjørvika Drift AS | Real estate | 2018 |
| Bjørvika Fysioterapi AS | Health & social care | 2009 |
| Bjørvika Hjemmel B6A AS | Real estate | 2018 |
| Bjørvika Hjemmel B8B AS | Real estate | 2010 |
| Bjørvika Hjemmel B9 AS | Real estate | 2010 |
| Bjørvika Holding AS | Real estate | 2025 |
| Bjørvika Infrastruktur AS | Construction | 2002 |
| Bjørvika Mat AS | Hospitality | 2023 |
| Bjørvika Property AS | Real estate | 2019 |
| Bjørvika Undertøy AS | Wholesale & retail | 2021 |
| Bjørvika Utvikling AS | Professional & scientific | 2002 |
| Bjørå AS | Administrative & support | 2023 |
| Bjøx AS | Professional & scientific | 2014 |
| BK Drift AS | Administrative & support | 2017 |
| BK Eiendom Bamble AS | Real estate | 2021 |
| BK Eiendom Oppdal AS | Real estate | 2021 |
| BK Holding Invest AS | Transport & logistics | 2021 |
| BK Management AS | Professional & scientific | 2025 |
| BK Regnskapsservice AS | Professional & scientific | 2015 |
| BK Scandinavia AS | Hospitality | 2018 |
| BK Snekker Og Tømrer AS | Construction | 2012 |
| BK Takst Og Eiendoms Service AS | Real estate | 2011 |
| BK Trucking AS | Real estate | 2022 |
| BKB AS | Real estate | 2006 |
| Bkbyggvedlikehold AS | Administrative & support | 2022 |
| BKH Holding AS | Hospitality | 2023 |
| Bki Eiendom Øst AS | Real estate | 2005 |
| Bki Grevlingveien 3 AS | Real estate | 2019 |
| Bki Gøteborggata 31A AS | Real estate | 2019 |
| Bki Munkegata 2 AS | Real estate | 2019 |
| Bki Prof.Birkelandsvei 26 AS | Real estate | 1995 |
| Bki Raschs Vei 36 AS | Real estate | 2019 |
| Bkka Eiendom AS | Real estate | 2013 |
| BKL AS | | 2022 |
| Bklf AS | Professional & scientific | 2015 |
| Bklo AS | | 2026 |
| Bklp Holding AS | Financial services | 2018 |
| Bkmalerservice AS | Construction | 2024 |
| BKP Invest AS | | 2024 |
| BKS Import AS | Wholesale & retail | 2012 |
| BKV Holding AS | Information & communication | 2024 |
| BKV Media AS | Information & communication | 2025 |
| BKW Norway NWP AS | Energy | 2014 |
| BL Capital AS | Financial services | 2013 |
| BL Capital I AS | Financial services | 2014 |
| BL Foto Og Filmstudio AS | Professional & scientific | 2024 |
| BL Holding Verdi AS | Professional & scientific | 2006 |
| Blaabjerg AS | | 2020 |
| Blaahaugen AS | Health & social care | 1991 |
| Blaais Holding AS | Professional & scientific | 2009 |
| Blaalid Transport AS | Transport & logistics | 2019 |
| Blaatind AS | Financial services | 2012 |
| Blaatind II AS | Financial services | 2014 |
| Blachere Illumination Norge AS | Wholesale & retail | 2025 |
| Black Balloon Records Ans | Information & communication | 2000 |
| Black Box Holding AS | | 2020 |
| Black Box Teater AS | Arts & recreation | 1985 |
| Black Bricks AS | Real estate | 2011 |
| Black Bricks Holding AS | | 2016 |
| Black Bricks Invest AS | Real estate | 2025 |
| Black Bricks Management AS | Real estate | 2005 |
| Black Bulldog AS | Other services | 2026 |
| Black Bulldog Holding AS | | 2025 |
| Black Cab AS | Transport & logistics | 2023 |
| Black Capital Technology AS | Information & communication | 2024 |
| Black Diamond Equipment Europe GmbH Nuf | Wholesale & retail | 2005 |
| Black Diamond Foliering Studio AS | Professional & scientific | 2019 |
| Black Dragon Eiendom 1 AS | Real estate | 2020 |
| Black Hole Ding AS | Financial services | 2012 |
| Black Lotus AS | | 2021 |
| Black Market AS | Hospitality | 2025 |
| Black Martini AS | Information & communication | 2005 |
| Black Panther AS | | 2024 |
| Black Panther Forlag Og Kreativt Byrå AS | Arts & recreation | 2026 |
| Black Rose Tattoo AS | Other services | 2023 |
| Black Sea Club AS | | 2007 |
| Black Sea Holding AS | Professional & scientific | 2017 |
| Black Sea Music Da | Information & communication | 2013 |
| Black Sea Property AS | Real estate | 2015 |
| Black Snow | Wholesale & retail | 2010 |
| Black Tusk AS | Real estate | 2007 |