| Bergmann & Bergmann AS | Real estate | 2015 |
| Bergs Spesialprodukter AS | Professional & scientific | 2009 |
| Bergshei Solkraftverk AS | Energy | 2024 |
| Bergsrønning Invest AS | Education | 2024 |
| Bergsø AS | Real estate | 2006 |
| Bergtoras Vei 10 AS | Real estate | 2009 |
| Bergum Verktøy AS | Wholesale & retail | 2019 |
| Bergvann Eiendom AS | Real estate | 2012 |
| Berner's Allsidige AS | Administrative & support | 2015 |
| Berners Eiendom AS | Real estate | 2022 |
| Berners Holding AS | Real estate | 2022 |
| Bernt Erik Olsen | Professional & scientific | 2013 |
| Bernt Holmsvei 11 AS | Households | 1952 |
| Berry Packaging Norway AS | Manufacturing | 1998 |
| Bertel O. Steen Agder AS | Other services | 1964 |
| Bertine AS | Wholesale & retail | 2017 |
| Besim Eiendom AS | Real estate | 2022 |
| Beskar Invest AS | | 2022 |
| Best Event AS | Administrative & support | 2017 |
| Best Interiør AS | Wholesale & retail | 2026 |
| Besta AS | Real estate | 2011 |
| Beste Praksis AS | Information & communication | 2006 |
| Beta Trading AS | Wholesale & retail | 2021 |
| Betania SA | Real estate | 1957 |
| Betek Norge AS | Administrative & support | 1999 |
| Betongguttane Holding AS | | 2016 |
| Betongstøp AS | Construction | 2020 |
| Bettem Invest AS | Real estate | 2008 |
| Better Business AS | Administrative & support | 1996 |
| Better Business Kompetanse AS | Professional & scientific | 2014 |
| Bettersleep AS | Wholesale & retail | 2022 |
| Bevander AS | Wholesale & retail | 2020 |
| Beverage Collection AS | Wholesale & retail | 2024 |
| Beverly AS | Hospitality | 2019 |
| Bg-Uia Invest AS | | 2024 |
| BGV Invest AS | | 2025 |
| BHL Invest AS | Real estate | 2012 |
| Bhoem Holding AS | Real estate | 2025 |
| Bia Eiendom AS | Real estate | 2015 |
| Bia-Eiendom AS | Real estate | 2010 |
| Bianco Verde AS | Transport & logistics | 2024 |
| Bib Invest AS | | 2013 |
| Bico Bygg Og Innredning AS | Construction | 1980 |
| Bicone AS | Information & communication | 2024 |
| Bide AS | Real estate | 2004 |
| Bidevind Consulting AS | Professional & scientific | 2005 |
| Biedronninger.No AS | Wholesale & retail | 2016 |
| Bigwig AS | Professional & scientific | 2017 |
| Biju AS | Information & communication | 2015 |
| Bil Sør AS | Wholesale & retail | 2004 |
| Bilbransjens Kompetansesenter Sør AS | Education | 1996 |
| Bilfag Sør AS | Education | 1994 |
| Bilforhandler AS | Wholesale & retail | 2024 |
| Bilhallen AS | Other services | 1999 |
| Bilhuset Parko Da | Real estate | 1988 |
| Bilselgeren AS | Wholesale & retail | 2023 |
| Bilskadeservice AS | Other services | 1990 |
| Biltorvet AS | Wholesale & retail | 2020 |
| Bilverksted Sør AS | Other services | 2017 |
| Bimo Invest 2 AS | Real estate | 2026 |
| Bimo Invest AS | Real estate | 2002 |
| Bio Consult AS | Professional & scientific | 1997 |
| Bioco Partners AS | | 2021 |
| Biodiscovery AS | Professional & scientific | 2021 |
| Biofyr.No AS | Manufacturing | 2014 |
| Biorens Skandinavia AS | Wholesale & retail | 2004 |
| Birdie Invest AS | Real estate | 2007 |
| Birdiebreeze AS | Real estate | 2017 |
| Birgers Transport AS | Transport & logistics | 2006 |
| Birkedalsveien 100 AS | Real estate | 2007 |
| Birkedalsveien 33 AS | Real estate | 2016 |
| Birkedalsveien Eiendom Holding AS | Real estate | 2009 |
| Birkeland Gul & Blå AS | Real estate | 2022 |
| Birkeland Gulvleggerfirma AS | Construction | 2006 |
| Birkeland Næringseiendom AS | Real estate | 2008 |
| Birkeland Solpark AS | Energy | 2022 |
| Birken Invest AS | | 2018 |
| Birketvedt Invest AS | Real estate | 2023 |
| Biso AS | | 2025 |
| Bistro Hos Richard AS | Hospitality | 2025 |
| Bitbike AS | Other services | 2021 |
| Bitfarm AS | Information & communication | 2015 |
| Bitlife AS | Information & communication | 2024 |
| Bitmesh AS | Information & communication | 2020 |
| Bitoba Invest AS | | 2022 |
| Bitpro AS | Information & communication | 2004 |
| Bivvy AS | Information & communication | 2023 |
| BJ Miljø AS | Professional & scientific | 2017 |
| Bjarnars Murerfirma A/S | Construction | 2008 |
| Bjarne Johansen Bildemontering AS | Wholesale & retail | 1997 |
| Bjelle Gamle Gård AS | Hospitality | 1987 |
| BJL Holding AS | Professional & scientific | 2020 |
| Bjo Invest AS | Financial services | 2006 |
| Bjoraa AS | Real estate | 2025 |
| Bjoraa Invest AS | | 2021 |
| Bjorvand & Co. AS | Professional & scientific | 2014 |
| Bjorvand AS | Wholesale & retail | 2021 |
| BJT Eiendom AS | Real estate | 2012 |
| BJT Holding AS | Real estate | 2019 |
| Bjørheim Prosjekt Partner AS | Arts & recreation | 2018 |