| Betonmast Eiendom Nittedal Holding AS | Real estate | 2021 |
| Betonmast Eiendom Nittedal Utvikling AS | Professional & scientific | 2021 |
| Betonmast Holding AS | Construction | 2018 |
| Betonmast Oslo AS | Construction | 2011 |
| Betotec AS | Construction | 1996 |
| Betru Holding AS | | 2024 |
| Bettan AS | Arts & recreation | 1998 |
| Better Brand AS | Information & communication | 2020 |
| Better Business International AS | Education | 2008 |
| Better Together AS | Professional & scientific | 2020 |
| Better Wines AS | Wholesale & retail | 2007 |
| Bettermind AS | Professional & scientific | 2020 |
| Bettina Burud Holding AS | Financial services | 2016 |
| Bettum Rør AS | Construction | 2025 |
| Bettys Beauty Salong AS | Other services | 2011 |
| Betula Climate AS | Professional & scientific | 2026 |
| Betulum AS | Professional & scientific | 2013 |
| Betzy Holding AS | | 2023 |
| Betzy Kjeldsbergs Vei 9 AS | Real estate | 2014 |
| Bevar Bygård AS | Real estate | 2024 |
| Bevarbolig AS | Administrative & support | 2025 |
| Bevarhms AS | Administrative & support | 2025 |
| Bevart AS | Information & communication | 2022 |
| Bevegelsesglede AS | Financial services | 2007 |
| Bevegelsespraksis AS | Education | 2024 |
| Bever Bygg AS | Construction | 1999 |
| Bever'N Barnehage SA | Education | 1996 |
| Beverage Academy AS | Education | 2008 |
| Beverage Brands AS | Wholesale & retail | 1993 |
| Beverage Partners Norway AS | Wholesale & retail | 1993 |
| Bevhouse AS | Wholesale & retail | 2022 |
| Bevi AS | Real estate | 2021 |
| Bevisst AS | Wholesale & retail | 2019 |
| Bevisst Ressursutvikling Ans | Professional & scientific | 2001 |
| Bevista AS | | 2021 |
| Bevivo AS | Wholesale & retail | 2024 |
| Bevo AS | Real estate | 2007 |
| Bevø AS | Real estate | 2015 |
| Bevø Bukt Eiendom AS | Real estate | 2005 |
| Bewell Holding AS | Wholesale & retail | 2020 |
| Bewianberg Drift AS | Construction | 2026 |
| Bex Invest AS | | 2025 |
| Bex Morty AS | Wholesale & retail | 2024 |
| Beyer AS | Arts & recreation | 2020 |
| Beyond Advisory AS | Professional & scientific | 2005 |
| Beyond AS | Professional & scientific | 2012 |
| Beyond Better Projects AS | Professional & scientific | 2025 |
| Beyond Brands AS | Wholesale & retail | 2018 |
| Beyond Built AS | | 2024 |
| Beyond Dot Com Corporation | | 1999 |
| Beyond Holding AS | Professional & scientific | 2013 |
| Beyond Imagination AS | Professional & scientific | 2021 |
| Beyond Imagination Norge AS | Professional & scientific | 2022 |
| Beyond Management AS | Professional & scientific | 2013 |
| Beyond Strategy Consulting AS | Professional & scientific | 2012 |
| Beyond the Pale Da | Arts & recreation | 2022 |
| Beyonderful Holding AS | | 2025 |
| Beyre AS | Health & social care | 2023 |
| Beziers Holding AS | Administrative & support | 2000 |
| Bezoar AS | | 2026 |
| BF Anlegg AS | Construction | 2016 |
| Bfa Solutions AG | Professional & scientific | 2013 |
| BFB Invest AS | Real estate | 2019 |
| BFG Consult AS | Information & communication | 2011 |
| BFG Finans AS | Information & communication | 2015 |
| BFG Holding AS | | 2021 |
| BFG Invest Ltd Nuf | Information & communication | 2010 |
| BFM 8 AS | Real estate | 2023 |
| BFN Holding AS | | 2024 |
| Bfo Sports & Management AS | Real estate | 2016 |
| BFR Nordic AS | Professional & scientific | 2026 |
| Bfsa Holding AS | | 2025 |
| Bfspluss AS | Professional & scientific | 2024 |
| Bfstyle AS | Wholesale & retail | 2007 |
| BFT Holding AS | | 2020 |
| BFV Maskindrift AS | Administrative & support | 2023 |
| BFV Regnskap AS | Professional & scientific | 2009 |
| BG Capital AS | Financial services | 2013 |
| BG Consult AS | | 2018 |
| BG Nor Invest AS | Wholesale & retail | 2005 |
| BG Nor AS | Wholesale & retail | 1986 |
| BG Team AS | Construction | 2022 |
| Bga Fotobutikk Nuf | Wholesale & retail | 2015 |
| BGC AS | Information & communication | 2025 |
| BGD Invest AS | | 2023 |
| Bghus AS | Real estate | 2018 |
| Bgi AS | Real estate | 2015 |
| Bgif IV Badger Bidco AS | | 2024 |
| Bgiske Invest AS | | 2025 |
| BGK Holding AS | | 2022 |
| BGM Stokke Holding AS | | 2023 |
| BGN Holding AS | | 2025 |
| Bgo Holding AS | | 2026 |
| BGP North AS | Real estate | 2020 |
| Bgp/Norex Shipping | | 2003 |
| Bgsu Eiendom AS | Real estate | 2018 |
| Bgsu Eiendom Oslo AS | Real estate | 2021 |
| BGT Business Hub AS | Information & communication | 2025 |
| Bgtre AS | Hospitality | 2022 |
| BH Holding AS | Real estate | 2005 |