| Bastiat Capital AS | | 2021 |
| Bastide AS | Wholesale & retail | 1995 |
| Bastien Holding AS | Financial services | 2015 |
| Bastifilar AS | Real estate | 1998 |
| Bastille AS | Financial services | 2005 |
| Bastion AS | Real estate | 1968 |
| Bastion Forvaltning AS | Information & communication | 1988 |
| Bastion Hotel AS | Hospitality | 1993 |
| Basto Holding AS | | 2022 |
| Basto Vann Og Avløpslag Andelslag 4 Bvaa 4 | Construction | 2004 |
| Basun Eiendom AS | Real estate | 2016 |
| Basware AS | Information & communication | 1971 |
| Bat Out of Hell AS | Construction | 2005 |
| Batech AS | Construction | 2018 |
| Bateleur AS | Arts & recreation | 2012 |
| Batera Nordic AS | Professional & scientific | 2023 |
| Bathroom Workshop AS | Construction | 2018 |
| Batnfjord Kro & Motell AS | Other services | 2004 |
| Bato Investment AS | Real estate | 1987 |
| Batong Media AS | Information & communication | 2020 |
| Battaheim Holding AS | | 2021 |
| Battelle Energy Alliance LLC | Professional & scientific | 2015 |
| Batteries Not Included AS | | 2026 |
| Batterigjenvinning AS | Water & waste | 2013 |
| Batteritech AS | Wholesale & retail | 2021 |
| Battery Development Group AS | | 2023 |
| Battja AS | Administrative & support | 2024 |
| Bau Holding AS | | 2026 |
| Baud Music AS | Arts & recreation | 2014 |
| Bauda AS | Real estate | 1959 |
| Bauda Mobility AS | Wholesale & retail | 2022 |
| Bauer Drift AS | Hospitality | 2007 |
| Bauer Eiendom AS | Hospitality | 1925 |
| Bauer Group AS | Hospitality | 2017 |
| Bauer Holding AS | Real estate | 2005 |
| Bauer Invest AS | Professional & scientific | 2025 |
| Bauer Is Back AS | | 2020 |
| Bauer Media Aps | Professional & scientific | 2020 |
| Bauer Media AS | Information & communication | 1990 |
| Bauer Media Outdoor Norge AS | Professional & scientific | 1996 |
| Baug Invest AS | | 2024 |
| Baugen AS | | 2024 |
| Baugeschäft Lewin | Construction | 2007 |
| Baugstø Holding AS | | 2024 |
| Baukhol AS | Professional & scientific | 2008 |
| Baulichgrand Speciality Fertilizer Norway AS | Wholesale & retail | 2020 |
| Baum Und Pferdgarten A/S Nuf | Wholesale & retail | 2010 |
| Baumann & Co AS | Real estate | 2013 |
| Baumann AS | Information & communication | 2023 |
| Baumann Invest AS | | 1996 |
| Baumarine AS | Transport & logistics | 1998 |
| Baums Norge AS | Professional & scientific | 2011 |
| Baune AS | Real estate | 2008 |
| Bauneveien AS | Real estate | 2021 |
| Bausch & Lomb Nordic AB Nuf | Wholesale & retail | 1997 |
| Baustin AS | Real estate | 2018 |
| Bauta Invest AS | Professional & scientific | 2018 |
| Bautista Prag AS | Professional & scientific | 2023 |
| Bavaria Eiendom Gardermoen AS | Real estate | 2018 |
| Bavaria Eiendom Ryen AS | Real estate | 1996 |
| Bavaria Invest AS | Financial services | 2005 |
| Bavas Frisør AS | Other services | 2017 |
| Bavbil Gardermoen AS | Real estate | 1998 |
| Bavbil Holding AS | Real estate | 2021 |
| Bavbil Invest AS | Real estate | 2017 |
| Baxi AS | | 2013 |
| Baxter AS | Wholesale & retail | 1974 |
| Baxter Healthcare SA | | 2003 |
| Bay Holding AS | Information & communication | 2016 |
| Bay Medical AS | Health & social care | 2020 |
| Baya AS | Wholesale & retail | 2026 |
| Bayarcal Holding Limited | | 2022 |
| Bayarcal Limited | Real estate | 2022 |
| Bayer | Wholesale & retail | 1996 |
| Bayer AB | | 1996 |
| Bayer AS | Wholesale & retail | 1964 |
| Bayer Norway AS | Wholesale & retail | 2012 |
| Bayes AS | Information & communication | 2025 |
| Baymarkets AS | Information & communication | 2015 |
| Baynor Invest AS | | 2020 |
| Bayswater Invest AS | | 2022 |
| Bazar Forlag AS | Information & communication | 2017 |
| Bazar Invest AS | | 1986 |
| BB 140 Holding AS | | 2023 |
| BB Auto AS | Wholesale & retail | 2018 |
| BB Elektro Bjørn Bakke AS | Construction | 1996 |
| BB Fonds AS | | 2019 |
| BB Group AS | Information & communication | 2016 |
| BB Gruppen AS | Professional & scientific | 2011 |
| BB Holdco AS | Financial services | 2022 |
| BB House AS | Information & communication | 2021 |
| BB Import AS | Wholesale & retail | 2024 |
| BB Kulturoppdrett Da | Arts & recreation | 2009 |
| BB Merchant Services AS | Professional & scientific | 2011 |
| BB MS Holding AS | | 2025 |
| BB Nordic AS | Information & communication | 2024 |
| BB Octopus AS | Transport & logistics | 2010 |
| BB Opsjon AS | Information & communication | 2016 |
| BB Produksjoner AS | Information & communication | 2021 |
| BB Security AS | Information & communication | 2025 |