| Boro-Bygg A/S | Professional & scientific | 1986 |
| Borowiak AS | Professional & scientific | 2023 |
| Borr Drilling Management AS | Professional & scientific | 2016 |
| Borre Torg Holding AS | Real estate | 2022 |
| Borresen Invest AS | | 2023 |
| Bortaførr AS | Health & social care | 2025 |
| Bortgang Ans | Information & communication | 2002 |
| Borthne-Trygsland Consulting AS | Professional & scientific | 2015 |
| Borti AS | Wholesale & retail | 2021 |
| Bortkasta Ans | Arts & recreation | 2026 |
| Bortne Eiendom AS | Real estate | 2017 |
| Boru Eiendom AS | Real estate | 2012 |
| Borøy Næringseiendom AS | Real estate | 2022 |
| Bosant AS | Wholesale & retail | 2023 |
| Boserup Holding AS | | 2000 |
| Bosj AS | Real estate | 1995 |
| Boso AS | Financial services | 2019 |
| Boson AS | Professional & scientific | 2011 |
| Bospar AS | Professional & scientific | 2024 |
| Bossard Norway AS | Wholesale & retail | 1983 |
| Bosses Bongoband Da | Arts & recreation | 2019 |
| Bossman Holding AS | | 2022 |
| Bossnuten AS | | 2020 |
| Bost Holding AS | | 2019 |
| Bostad AS | | 2025 |
| Bostik AS | Wholesale & retail | 1964 |
| Boston Scientific Nordic AB Filial Norge Nuf | Professional & scientific | 2014 |
| Bosu AS | Hospitality | 2020 |
| Bosu Holding AS | Real estate | 2024 |
| Bot AS | | 2017 |
| Botag Norge AS | Wholesale & retail | 2023 |
| Botalo AS | Wholesale & retail | 2010 |
| Botanisk Invest AS | | 2020 |
| Botezco AS | Real estate | 2016 |
| Both Hands Holding AS | | 2025 |
| Bothel Holding AS | Real estate | 2007 |
| Botheo AS | | 2023 |
| Bothner Consulting AS | Information & communication | 2023 |
| Botholf AS | | 2023 |
| Botn Invest AS | | 2021 |
| Botnen Holding AS | | 2026 |
| Botnen Kraftverk AS | Energy | 2012 |
| Botnkrona Eiendom AS | Real estate | 2007 |
| Botten Aquaservice AS | Agriculture & fishing | 2025 |
| Botterli Beskjeftigelser AS | Financial services | 2015 |
| Bottinor AS | Wholesale & retail | 2025 |
| Bottolfs Osteopati Og Treningsfysiologi AS | Health & social care | 2025 |
| Bou Capital AS | | 2022 |
| Boujeewall AS | Professional & scientific | 2024 |
| Boulangerie M AS | Manufacturing | 2015 |
| Boulder AS | | 2026 |
| Boundless AS | Professional & scientific | 2022 |
| Boundless Payroll Norway AS | Administrative & support | 2022 |
| Bounji AS | Other services | 2023 |
| Bouts Invest AS | | 2021 |
| Bouvet ASA | Information & communication | 1995 |
| Bouvet Norge AS | Information & communication | 2011 |
| Bovesan Eierskap AS | Information & communication | 2021 |
| Bovia Eiendom AS | Real estate | 2019 |
| Bovide AS | Information & communication | 2019 |
| Bovieran 10 AS | Real estate | 2022 |
| Bovieran 11 AS | Real estate | 2022 |
| Bovieran 8 AS | Real estate | 2022 |
| Bovieran AS | Real estate | 2017 |
| Bovieran Drangsvann AS | Real estate | 2021 |
| Bovieran Prosjekt 1 AS | Real estate | 2021 |
| Bovieran Skogsskiftet AS | Real estate | 2015 |
| Bovieran Veum AS | Real estate | 2021 |
| Bovind Holding AS | Real estate | 2016 |
| Bovind Og Bjerke AS | Wholesale & retail | 2021 |
| Bow AS | | 2018 |
| Bowe Eiendom AS | Real estate | 1988 |
| Boweltreat AS | Professional & scientific | 2016 |
| Bowen Road AS | Financial services | 2018 |
| Bowhead Invest AS | | 2026 |
| Bowthorpe Emp Limited | Wholesale & retail | 1995 |
| Box on Da | Information & communication | 2014 |
| Box Retail AS | Real estate | 2022 |
| Boxer AS | Real estate | 2020 |
| Boxgo AS | Wholesale & retail | 2017 |
| Boxlab AS | Arts & recreation | 2025 |
| Boxnor AS | Wholesale & retail | 2021 |
| Boxnor Utleie AS | Administrative & support | 2026 |
| Boxshop AS | Arts & recreation | 2013 |
| Boxup AS | Information & communication | 2016 |
| Boy Bye AS | Real estate | 2022 |
| Boyar Invest AS | | 2020 |
| Boyd Thermal Solutions Norway AS | Wholesale & retail | 2025 |
| Boyden AS | Professional & scientific | 1986 |
| Boyesen & Munthe AS | Wholesale & retail | 1995 |
| Boygal AS | Professional & scientific | 2019 |
| Boys Holding AS | Financial services | 2015 |
| Bozan AS | Professional & scientific | 2013 |
| Bozkurt Holding AS | Transport & logistics | 2017 |
| Bozkurt Logistikk AS | Transport & logistics | 2017 |
| Bozo AS | Hospitality | 2013 |
| BP Asennus AS | Manufacturing | 2018 |
| BP Marine Limited | Wholesale & retail | 2004 |
| BP Pubutvikling AS | Hospitality | 1992 |
| BP Trading AS | | 2019 |