| Blyberget AS | Education | 2005 |
| Blyt AS | Wholesale & retail | 2022 |
| Blå Esbå AS | | 2019 |
| Blå Kors Klinikk Lade AS | Health & social care | 2007 |
| Blå Lagune AS | Other services | 2007 |
| Blåhø AS | Real estate | 2005 |
| Blåin AS | Real estate | 2014 |
| Blånæggel Da | Arts & recreation | 2020 |
| Blåseiso AS | Construction | 2021 |
| Blåsmo Musikk AS | Wholesale & retail | 1985 |
| Blåstål AS | | 2021 |
| BM Capital AS | Construction | 2024 |
| BM Invest AS | Real estate | 2020 |
| BM Ke Holding AS | Construction | 2024 |
| BM Utemiljø Og Bygg AS | Construction | 2013 |
| BMB Eiendom AS | Real estate | 2019 |
| BMC Elektro AS | Construction | 2024 |
| BMG Bolig AS | Real estate | 2015 |
| BMG Invest AS | Real estate | 2005 |
| BN Bank ASA | Financial services | 1961 |
| BN Bil AS | Other services | 2006 |
| BN Bygg AS | Construction | 2025 |
| BN Bygg AS | Construction | 2013 |
| BN Bygg Eiendom AS | Real estate | 2025 |
| BN Bygg Holding AS | | 2025 |
| BN Tromsø AS | Real estate | 2019 |
| Bnext Holding AS | Real estate | 2016 |
| BNV16 AS | Real estate | 2025 |
| Bnw-Energy | Information & communication | 2014 |
| Bo Consulting AS | Real estate | 2020 |
| Boa 3 AS | Financial services | 2008 |
| Boa Ahts AS | Administrative & support | 2020 |
| Boa Ahts Holding AS | Transport & logistics | 2012 |
| Boa Barges AS | Transport & logistics | 2008 |
| Boa Contracting AS | Transport & logistics | 2021 |
| Boa Crewing 1 AS | Transport & logistics | 2017 |
| Boa Crewing 2 AS | Transport & logistics | 2017 |
| Boa Crewing 3 AS | Transport & logistics | 2021 |
| Boa Eiendom AS | Real estate | 2000 |
| Boa Investment AS | Financial services | 2008 |
| Boa Management AS | Transport & logistics | 2017 |
| Boa Marine AS | | 2026 |
| Boa Offshore AS | Transport & logistics | 1979 |
| Boa Shipping AS | Transport & logistics | 1999 |
| Boa Tugs AS | Transport & logistics | 2008 |
| Bob Agency AS | Wholesale & retail | 2026 |
| Bob Snekkerservice AS | Construction | 2023 |
| Boba Joy Bubble Tea & More AS | Wholesale & retail | 2021 |
| Boba Tea AS | Hospitality | 2021 |
| Boda Holding AS | | 2022 |
| Bodø Airport Hotel AS | Real estate | 2012 |
| Bodøgaten 2 Ans | Real estate | 1992 |
| Bogart AS | Wholesale & retail | 1985 |
| Bogart Holding AS | | 2026 |
| Bogart Lade AS | Wholesale & retail | 2026 |
| Bogen Øye Invest AS | | 2021 |
| Bogøy Handelseiendom AS | Real estate | 2021 |
| Boho Invest AS | Real estate | 2022 |
| Bold 1 AS | Real estate | 2015 |
| Boleie AS | Real estate | 2021 |
| Bolig Norge AS | Real estate | 2019 |
| Bolig Og Næringsutleie AS | Real estate | 2005 |
| Bolig Pro AS | Real estate | 2024 |
| Bolig PV6 AS | Real estate | 2020 |
| Bolig Til Leie AS | Real estate | 2022 |
| Bolig- Og Eiendomsselskapet AS | Real estate | 2014 |
| Boligopp AS | Construction | 2018 |
| Boligsameiet Langvolden | Households | 2013 |
| Boligservice Da | Wholesale & retail | 2003 |
| Boligsystemer AS | Real estate | 2024 |
| Boliva Eiendom AS | Real estate | 2021 |
| Bolshøyden Utvikling AS | Professional & scientific | 2020 |
| Bomann Invest AS | Real estate | 2021 |
| Bombasta Holding AS | Information & communication | 2024 |
| Bomringen Da | Real estate | 2001 |
| Bonaventura AS | Professional & scientific | 2003 |
| Bonavita AS | Health & social care | 2025 |
| Bonera AS | Real estate | 2019 |
| Bonera Eiendom AS | Real estate | 2024 |
| Bonera Utvikling AS | Real estate | 2024 |
| Bong Events AS | Information & communication | 2026 |
| Bonitas Eiendomsforvaltning AS | Real estate | 2004 |
| Bonso AS | Health & social care | 2021 |
| Bonusher AS | | 2025 |
| Bookibud AS | Information & communication | 2022 |
| Booknet Ans | Wholesale & retail | 2001 |
| Boquist Invest AS | Information & communication | 2018 |
| Boreal Bane AS | Transport & logistics | 1989 |
| Boreal Buss AS | Transport & logistics | 1997 |
| Borex AS | Professional & scientific | 2025 |
| Borg Drift AS | Real estate | 2016 |
| Borg Forvaltning AS | Real estate | 2015 |
| Borg Næringsmegling AS | Real estate | 2026 |
| Borg Oppmåling AS | Professional & scientific | 2020 |
| Borg Research AS | Information & communication | 2024 |
| Borg Security AS | Information & communication | 2025 |
| Borgar Hagen Holding AS | Real estate | 2021 |
| Borgerud AS | Administrative & support | 2005 |
| Borgo Holding AS | | 2026 |
| Borud Invest AS | | 2020 |