| Baawi AS | | 2024 |
| Bad & Interiør AS | Construction | 2022 |
| BAD1 AS | Construction | 2007 |
| Baikal Capital Holding AS | Real estate | 2016 |
| Baj Holding AS | Health & social care | 2021 |
| Bakke Gruppen AS | Real estate | 1994 |
| Bakken Eiendom Drammen AS | Wholesale & retail | 2006 |
| Bakken Motor AS | Wholesale & retail | 1989 |
| Balansert AS | | 2025 |
| Baldvin Invest AS | Construction | 2019 |
| Balm AS | Wholesale & retail | 2015 |
| Balm Møbler AS | Wholesale & retail | 2021 |
| Baltazar Menighetsbarnehage AS | Education | 2022 |
| Baneveien 32 B AS | Energy | 2009 |
| Bang & Elsfjordstrand Da | Professional & scientific | 1995 |
| Bang-Olsen Revisjon AS | Professional & scientific | 2021 |
| Bankbygget Utvikling AS | Real estate | 2020 |
| Bar Holding AS | | 2026 |
| Bardun AS | Information & communication | 2026 |
| Bare 3 AS | Wholesale & retail | 2019 |
| Bare Bra Barnemat AS | Information & communication | 2017 |
| Baritone AS | Arts & recreation | 1997 |
| Barkaden Bragernes AS | Hospitality | 2024 |
| Barkaden Drammen AS | Hospitality | 2021 |
| Barnasunikeverden AS | Wholesale & retail | 2025 |
| Barneskatter Drammen AS | Wholesale & retail | 2018 |
| Barnetekniske AS | Manufacturing | 2007 |
| Barnstormer Resource Group AS | Professional & scientific | 2012 |
| Barona AS | Administrative & support | 2012 |
| Barona Human Resource Services AS | Construction | 2014 |
| Barona Teknisk Installasjon AS | Construction | 2021 |
| Barpoint Mobile AS | Wholesale & retail | 2010 |
| Barskog AS | Professional & scientific | 2026 |
| Barta AS | Information & communication | 2011 |
| Barth Invest AS | | 2020 |
| Bartleby Corp. AS | Hospitality | 2010 |
| Bas Bygg AS | Construction | 2006 |
| Bas Mal AS | Construction | 2022 |
| Basalt Eiendom AS | Real estate | 2014 |
| Basmatax Holding AS | | 2025 |
| Baumat AS | Construction | 2021 |
| Baz AS | Wholesale & retail | 2023 |
| BB Computerteknikk AS | Information & communication | 2001 |
| BB Gruppen Isolasjon AS | Wholesale & retail | 2020 |
| BBM Aps | Wholesale & retail | 2006 |
| Bdre AS | Wholesale & retail | 2024 |
| BDS Group AS | Health & social care | 2026 |
| Be Invest AS | Financial services | 2011 |
| Be Utvikling AS | Professional & scientific | 2003 |
| Bean Invest AS | | 2024 |
| Beaphar Norge AS | Wholesale & retail | 2008 |
| Bear Bygg AS | Construction | 2017 |
| Bear Group AS | Construction | 2019 |
| Bearforge Holding AS | | 2026 |
| Bearsalg AS | Real estate | 2015 |
| Beauty Expert AS | Other services | 2022 |
| Beauty Magic AS | Other services | 2024 |
| Beauty Zone Klinikk AS | Other services | 2026 |
| Beautyzone AS | Other services | 2022 |
| Bebanotto AS | Information & communication | 2018 |
| Beck Og Bie Bygg AS | Construction | 2016 |
| Bedriftslokalet AS | Real estate | 2016 |
| Bedriftsmateriell AS | Wholesale & retail | 2019 |
| Bedriftsvegen 24 AS | Real estate | 2014 |
| Behag AS | Wholesale & retail | 2026 |
| Beijer Electronics AS | Wholesale & retail | 1954 |
| Beinir AS | Real estate | 2013 |
| Bekke Invest AS | | 2023 |
| Bekkedalen Invest AS | | 2025 |
| Bekken VVS Og Rådgivning AS | Construction | 2023 |
| Bekkestad AS | Construction | 2021 |
| Bekkeveien AS | Real estate | 2017 |
| Belegningsteknikk AS | Manufacturing | 1998 |
| Beli AS | Financial services | 1973 |
| Belita Eiendom AS | Health & social care | 1990 |
| Bell Media AS | Professional & scientific | 2014 |
| Bellatrix Norway AS | Professional & scientific | 2025 |
| Bellavé Studio AS | Wholesale & retail | 2025 |
| Bemaco Drift AS | Real estate | 2024 |
| Bemann IT AS | Administrative & support | 2012 |
| Bemanor AS | Administrative & support | 2020 |
| Bendik Bendiksen Holding AS | | 2018 |
| Bendiksen Holding AS | | 2018 |
| Benedicte Fashion AS | Other services | 2026 |
| Benestad Eiendom AS | Real estate | 1982 |
| Beni Holdco AS | | 2026 |
| Beniru AS | | 2021 |
| Benjamin Øwre Holding AS | | 2025 |
| Benmik Holding AS | Real estate | 2006 |
| Benny Invest AS | Real estate | 2005 |
| Benoffer AS | Wholesale & retail | 2021 |
| Bent Lund Holding AS | | 2019 |
| Bentsrudveien 4 AS | Real estate | 2006 |
| Bepe Eiendom AS | Real estate | 2006 |
| Bera Invest AS | Professional & scientific | 2005 |
| Berg-Hansen Reisebureau AS Drammen | Administrative & support | 1980 |
| Bergaas VVS AS | Construction | 2016 |
| Bergbo Invest AS | | 2021 |
| Bergevika Consulting AS | Information & communication | 2013 |
| Bergliveien AS | | 2021 |