| B2K Invest AS | Wholesale & retail | 1965 |
| B2S Research AS | Information & communication | 2001 |
| B3 Lilleaker Eiendom AS | Real estate | 2018 |
| B3 Norge AS | Information & communication | 2025 |
| B4 Investigate AS | Professional & scientific | 2020 |
| B4 Jessheim AS | Real estate | 2019 |
| B4 Lilleaker Eiendom AS | Real estate | 2021 |
| B4A Gruppen AS | Real estate | 2021 |
| B4L Invest AS | Hospitality | 2024 |
| B5 Eiendom AS | Real estate | 2026 |
| B5 Flex AS | Real estate | 2022 |
| B64 Technology AS | Information & communication | 2023 |
| B6A Bispekaia Bolig AS | Real estate | 2017 |
| B6A Bispekaia FBK AS | Real estate | 2021 |
| B7 Bolig Syd AS | Real estate | 2016 |
| B7 Bolig Vest AS | Real estate | 2016 |
| B7 Invest AS | Real estate | 2016 |
| B9 Gruppen AS | Transport & logistics | 2024 |
| B:Moved AS | Professional & scientific | 2018 |
| Ba Arkitekter AS | Professional & scientific | 1985 |
| Ba Holding AS | Real estate | 1945 |
| Ba Invest AS | Real estate | 2016 |
| Ba Rens Og Vasketeria AS | Other services | 1989 |
| Ba&Sh Norway AS | Wholesale & retail | 2018 |
| Ba-Hr AS | Professional & scientific | 2010 |
| BA10 Næring AS | Real estate | 2024 |
| BA5 Apartments AS | Real estate | 2023 |
| BA5 Ekstra 22 AS | Real estate | 2023 |
| BA5 Ekstra 36 AS | Real estate | 2025 |
| BA5 Ekstra 37 AS | Real estate | 2025 |
| BA5 Ekstra 38 AS | Real estate | 2025 |
| BA5 Ekstra 39 AS | Real estate | 2025 |
| BA5 Ekstra 40 AS | Real estate | 2025 |
| BA5 Ekstra 41 AS | Real estate | 2025 |
| BA5 Ekstra 43 AS | Real estate | 2025 |
| BA5 Ekstra 44 AS | Real estate | 2025 |
| BA5 Ekstra 45 AS | Real estate | 2025 |
| BA5 Invest AS | Real estate | 1991 |
| BA62 Health & Beauty AS | Other services | 2024 |
| BA6B Eiendom AS | Real estate | 2019 |
| Baaf AS | Professional & scientific | 2025 |
| Baalsrud Holding AS | Arts & recreation | 2019 |
| Baan Chan AS | Hospitality | 2020 |
| Baan Thai Frogner AS | Other services | 2018 |
| Baard Lunde AS | Professional & scientific | 2024 |
| Baardgames AS | Information & communication | 2015 |
| Baardsen Holding AS | Professional & scientific | 2024 |
| Baardsen Sport AS | Professional & scientific | 2024 |
| Baardseth AS | | 2004 |
| Baardseth Holding AS | | 2026 |
| Baardson Holding AS | | 2024 |
| Baas Kran Utleie AS | Administrative & support | 2017 |
| Baas Oslo AS | Construction | 2010 |
| Baastad Transport AS | Transport & logistics | 2016 |
| Baatplassen AS | Information & communication | 2016 |
| Bab Alharah AS | Hospitality | 2022 |
| Bab AS | | 2025 |
| Bab Eiendom AS | | 2004 |
| Bab Finans AS | Real estate | 2006 |
| Bab Forvaltning AS | Administrative & support | 2005 |
| Bab Holding AS | Financial services | 2005 |
| Bab Invest AS | | 2026 |
| Bab Studio AS | Professional & scientific | 2026 |
| Baba Bar Strøget AS | Hospitality | 2025 |
| Baba Sushi AS | Hospitality | 2024 |
| Baba Vision AS | Information & communication | 2024 |
| Babar AS | Financial services | 2006 |
| Babar Eiendom AS | Real estate | 2023 |
| Babar Invest AS | Hospitality | 2016 |
| Babarber Studio AS | Other services | 2021 |
| Babba International AS | | 2020 |
| Babbalon Holding AS | | 2021 |
| Babbo Collective Øvrefoss AS | Hospitality | 2020 |
| Babbo Holding AS | Wholesale & retail | 2024 |
| Babel AS | Information & communication | 2019 |
| Babel Fish Translation AS | Professional & scientific | 2022 |
| Babelfish AS | Financial services | 2000 |
| Babelicious Unicorn Hunter AS | Financial services | 2016 |
| Babisco AS | Real estate | 2020 |
| Babola AS | Professional & scientific | 2017 |
| Baboy AS | | 2021 |
| Babson AS | Real estate | 2024 |
| Babsvik Eiendom AS | Real estate | 2016 |
| Babusjka AS | Information & communication | 2007 |
| Baby Babbo AS | Hospitality | 2018 |
| Baby by Blomdal AS | Wholesale & retail | 2024 |
| Babyboom AS | Wholesale & retail | 2025 |
| Babydesign AS | Professional & scientific | 2016 |
| Babyhjelpen AS | Information & communication | 2022 |
| Babylon Film AS | Administrative & support | 2013 |
| Babymood AS | Manufacturing | 2022 |
| Babyoljefondet AS | | 2025 |
| Babyringen AS | Wholesale & retail | 1993 |
| Babystore Norge Nuf | Wholesale & retail | 2012 |
| Babyswim AS | Health & social care | 1997 |
| Bacalao Til Folket AS | Hospitality | 2021 |
| Bacani Holding AS | | 2026 |
| Bacardi Norge AS | Wholesale & retail | 2001 |
| Bacardi-Martini Norge | Administrative & support | 1999 |
| Bacaro AS | Hospitality | 2022 |