| Baruch AS | Manufacturing | 2025 |
| Bas Utvikling AS | Real estate | 2014 |
| Basement Musikk AS | Arts & recreation | 1995 |
| Bash Eiendom AS | Real estate | 2022 |
| Basis Consilia AS | | 2017 |
| Basisfot AS | Health & social care | 2000 |
| Basol Norge AS | Wholesale & retail | 1993 |
| Bass Rave AS | Arts & recreation | 2026 |
| Basse AS | | 2022 |
| Battery Storage Holding AS | Energy | 2022 |
| Baxx Robotics AS | Professional & scientific | 2019 |
| Bazooka AS | Hospitality | 2025 |
| BB Bygg Og Invest AS | Real estate | 2026 |
| BB Eiendom AS | Real estate | 1987 |
| BB Oslo AS | Construction | 2022 |
| Bba Ifun AS | | 2023 |
| BC Trading AS | Wholesale & retail | 2025 |
| BCD Eiendom AS | Real estate | 2018 |
| Bcompany AS | Wholesale & retail | 2020 |
| BCR Holding AS | Construction | 2013 |
| Bdconsult AS | Professional & scientific | 2023 |
| Bde AS | Real estate | 2017 |
| BDG Holding AS | Construction | 2018 |
| BDH AS | Real estate | 2017 |
| Be Ventures AS | | 2025 |
| Be-Con AS | Professional & scientific | 2012 |
| Beachcomber of Norway AS | | 2004 |
| Bear Cave AS | Arts & recreation | 2011 |
| Beat Holding AS | Real estate | 2014 |
| Beate Godtfredsen Holding AS | Real estate | 2015 |
| Beatgrid AS | Information & communication | 2021 |
| Beaum Holding AS | | 2025 |
| Beauty Room AS | Other services | 2026 |
| Bebalanced.Ai AS | Information & communication | 2025 |
| Bebe B AS | Professional & scientific | 2017 |
| Beckmann AS | Wholesale & retail | 1946 |
| Beckmann Holding AS | Real estate | 2005 |
| Beckmann Minde Holding AS | Real estate | 2018 |
| Bedford Holding AS | Real estate | 2013 |
| Bedrift & Personalpsykologi AS | Professional & scientific | 2003 |
| Beehive AS | Information & communication | 2019 |
| Beeorganic AS | Wholesale & retail | 2020 |
| Beerzebub AS | Manufacturing | 2021 |
| Befring Kraft AS | Energy | 2002 |
| Begg Eiendom AS | Real estate | 2003 |
| Begin AS | | 2019 |
| BEI1 AS | Real estate | 2014 |
| Beirut Shish Kebab AS | Hospitality | 2021 |
| Beito Eiendom AS | Real estate | 1991 |
| Bekka AS | Professional & scientific | 2019 |
| Bekken Productions AS | Information & communication | 2022 |
| Beko - Bygg Og Eiendom AS | Real estate | 2005 |
| Beko Advokat AS | Professional & scientific | 2005 |
| Beko Holding AS | Professional & scientific | 2005 |
| Bela Line AS | Other services | 2016 |
| Beld AS | Real estate | 2020 |
| Bellas AS | Hospitality | 2014 |
| Bellas Holding AS | Hospitality | 2020 |
| Bellas Markens AS | Hospitality | 2021 |
| Bellas Tangen AS | Hospitality | 2021 |
| Bellator AS | Professional & scientific | 2020 |
| Belle Nails AS | Other services | 2026 |
| Bellevin AS | Wholesale & retail | 2000 |
| Bellevue Invest AS | Real estate | 2021 |
| Bellevuebakken Eiendom AS | Real estate | 2009 |
| Bello AS | Other services | 2023 |
| Beluga Electric Cars KFT. Nuf | Wholesale & retail | 2024 |
| Belyst AS | Professional & scientific | 2025 |
| Bema Holding AS | Real estate | 2005 |
| Bemanning Sør AS | Administrative & support | 2024 |
| Bemanningsxperten Norge AS | Administrative & support | 2017 |
| Bemanningsxperten Sør AS | Administrative & support | 2017 |
| Bemerkelsesverdig AS | | 2025 |
| Bemic AS | Wholesale & retail | 2013 |
| Benedics AS | Professional & scientific | 2017 |
| Benestad AS | Real estate | 1996 |
| Bengun Holding AS | | 2026 |
| Bensinstasjonstomt Rige AS | Real estate | 2025 |
| Bente Thoresen Plaszko AS | Real estate | 2022 |
| Bentsen Invest AS | | 2019 |
| Beolafsen Holding AS | | 2026 |
| Beran Holding AS | | 2025 |
| Bercon AS | Wholesale & retail | 2014 |
| Berdis AS | Professional & scientific | 2015 |
| Berg & Valvik Luga Ans | Hospitality | 1992 |
| Berg Gruppen AS | Real estate | 2005 |
| Berg Hansen Reisebureau Agder AS | Administrative & support | 1997 |
| Berg-Utby Tte AS | Professional & scientific | 2012 |
| Bergastølen Holdning AS | Information & communication | 2021 |
| Berge Eiendom AS | Real estate | 1990 |
| Bergen Fasadevask AS | Administrative & support | 2023 |
| Bergendoff & Poll AS | Professional & scientific | 2015 |
| Berges Auto AS | Wholesale & retail | 2025 |
| Berges Bruktbil Nuf | Wholesale & retail | 2015 |
| Berges Hundeassistanse AS | Other services | 2019 |
| Bergesletta Næring AS | Real estate | 2017 |
| Bergesletta Utvikling AS | Real estate | 2007 |
| Bergfast AS | Professional & scientific | 2021 |
| Bergkontroll AS | Professional & scientific | 2025 |
| Berglihn Invest AS | | 2025 |