| Bergtuns Gullsmedverksted AS | Other services | 2020 |
| Bergverk AS | Professional & scientific | 2015 |
| Bergwerk Development AS | Professional & scientific | 2026 |
| Bernice Holding AS | | 2025 |
| Bernt Roligheten AS | Mining & quarrying | 2006 |
| Berny Event AS | Administrative & support | 2025 |
| Berny Norge AS | Arts & recreation | 1993 |
| Berserk Software AS | Information & communication | 2019 |
| Besimodesign Ans | Information & communication | 2002 |
| Best Bilpleie Da | Other services | 2010 |
| Best Bilpleie Sandefjord AS | Other services | 2016 |
| Best Solution AS | Construction | 2026 |
| Best You Communication AS | Professional & scientific | 2019 |
| Bestvalue AS | Information & communication | 2011 |
| Beta Investment Holding AS | | 2016 |
| Betsy & Jon Trading Da | Wholesale & retail | 2003 |
| Bettershore AS | Information & communication | 2018 |
| Bettum AS | Professional & scientific | 2012 |
| Bever Marin AS | Manufacturing | 1984 |
| Bevisst Utvikling Da | Health & social care | 2018 |
| Bey Holding AS | Education | 2023 |
| Beyer Holding AS | Financial services | 1991 |
| Bfi AS | Real estate | 2005 |
| Bgur Partner AS | Professional & scientific | 2017 |
| BH Invest Vestfold AS | Professional & scientific | 2013 |
| BHB Capital Management AS | Financial services | 2009 |
| Bhell Consult AS | Construction | 2022 |
| BHJ Eiendom AS | Real estate | 2006 |
| BHR Finans & Regnskap AS | Professional & scientific | 2012 |
| BHR Partner AS | Professional & scientific | 2017 |
| BHR Regnskap Bergen AS | Professional & scientific | 2025 |
| Bhrv Invest AS | Real estate | 2021 |
| Bielenberg AS | | 2021 |
| Big Mur AS | Administrative & support | 2021 |
| Bigfrog AS | | 2015 |
| Bil Elektro Montasje AS | Other services | 2012 |
| Bil Industri AS | Wholesale & retail | 2015 |
| Bil Spot AS | Wholesale & retail | 2022 |
| Bil-Service AS | Other services | 1995 |
| Bil-Service Holding AS | Other services | 2017 |
| Bildemagi AS | Professional & scientific | 2012 |
| Bilkompaniet Sandefjord AS | Wholesale & retail | 2014 |
| Bille Invest AS | Real estate | 2007 |
| Bilov AS | Professional & scientific | 2004 |
| Bilvask.No AS | Other services | 2014 |
| Bindra Holding AS | Wholesale & retail | 2019 |
| Bing Invest AS | | 2024 |
| Bingeplassveien 2 | Real estate | 2018 |
| Bioconnect AS | Wholesale & retail | 2011 |
| Biodata AS | Information & communication | 2022 |
| Biorganic AS | Wholesale & retail | 2026 |
| Biovet AS | Professional & scientific | 2016 |
| Birchpile AS | | 2021 |
| Birgitte Tholin AS | Health & social care | 2024 |
| Bitcoinfabrikken AS | Information & communication | 2022 |
| Bizerba GmbH & Co. KG | Agriculture & fishing | 2010 |
| Bjarne Ask Eiendom AS | Real estate | 1989 |
| Bjarte Myrhol Holding AS | | 2017 |
| Bjercke Holding AS | Financial services | 2018 |
| Bjerggata 22 Invest AS | Real estate | 2007 |
| Bjerggata 57 Eiendom AS | Real estate | 2011 |
| Bjurstedt Ans | Real estate | 1995 |
| Bjønn Holding AS | Professional & scientific | 2006 |
| Bjørge Regnskap AS | Professional & scientific | 2004 |
| Bjørn Sletmo Holding AS | | 2017 |
| Bjørnar Eiendom AS | Real estate | 2002 |
| Bjørnar Snarkjøp Haukerød AS | Wholesale & retail | 2021 |
| Bjørndalveien AS | Real estate | 2018 |
| Bjørnstad Tjenester AS | Construction | 2026 |
| Bjørnåsen Eiendom AS | Real estate | 2001 |
| Bjørvik & Haugen AS | Construction | 1996 |
| Bjørvik Invest AS | | 2022 |
| Bjørvik Malerservice AS | Wholesale & retail | 1984 |
| Bjørvik-Gruppen AS | Wholesale & retail | 2013 |
| Bjørviken Invest AS | Real estate | 2020 |
| BK Dekorima AS | Manufacturing | 1990 |
| BK Fortuna AS | Real estate | 2009 |
| BK Gruppen AS | Professional & scientific | 2025 |
| BK Holding AS | Manufacturing | 1981 |
| BK Industrier AS | Manufacturing | 1986 |
| BK Logistikk AS | Transport & logistics | 1999 |
| BKK Arendal Eiendom AS | Real estate | 2011 |
| Bko Pizzadrift AS | Hospitality | 2015 |
| BL Drift AS | Construction | 2025 |
| Blaane AS | Professional & scientific | 2010 |
| Blaasen AS | | 2005 |
| Black Box Norge AS | Wholesale & retail | 2000 |
| Black Mountain AS | Wholesale & retail | 2018 |
| Bleken Data AS | Information & communication | 1999 |
| Bleken Holding AS | Information & communication | 1980 |
| Bleken Invest AS | Financial services | 2005 |
| Blend Frisør AS | Other services | 2009 |
| Blinken Hårpleie AS | Other services | 2019 |
| Blix 1 AS | | 2026 |
| BLJ Holding AS | | 2020 |
| Blom Invest AS | Financial services | 2005 |
| Blomdahl AS | | 2023 |
| Blomstermakeriet I Kirkegata AS | Wholesale & retail | 2004 |
| Bloop Studios AS | Information & communication | 2026 |
| Blue Ice AS | Wholesale & retail | 2006 |