| Bacchus AS | Arts & recreation | 2019 |
| Bacchus Holding AS | Wholesale & retail | 2018 |
| Bacchus Invest AS | | 2023 |
| Bacchus Norge AS | Real estate | 2016 |
| Bache Invest AS | Professional & scientific | 2015 |
| Bache-Gabrielsen Norge AS | Wholesale & retail | 1974 |
| Bache-Wiig Mæland Advokatfirma AS | Professional & scientific | 2024 |
| Bache-Wiig Og Reitan Møbelsnekker Mester Bedrift AS | Manufacturing | 2003 |
| Bachelier AS | | 2015 |
| Bachelor Chef AS | Information & communication | 2010 |
| Bachesvei 1 Drammen AS | Real estate | 1942 |
| Bacheverket Holding AS | | 2026 |
| Bachke Maskin AS | Wholesale & retail | 2008 |
| Bachmanity AS | | 2021 |
| Bachmann Electronic GmbH Nuf | Wholesale & retail | 2024 |
| Back AS | Information & communication | 2008 |
| Back Holding AS | | 2024 |
| Back in Black Capital AS | Financial services | 2016 |
| Back Office Support AS | Professional & scientific | 2009 |
| Back Up Skylt O Dekor Ørebro AB | Manufacturing | 1996 |
| Backbone Invest AS | | 2023 |
| Backbone Software Da | Information & communication | 2003 |
| Backegården Da | Real estate | 2001 |
| Backer Skeie AS | Professional & scientific | 2003 |
| Backerskeie People AS | Professional & scientific | 2023 |
| Backflip AS | Information & communication | 2012 |
| Backgr AS | Wholesale & retail | 2026 |
| Backhome AS | Hospitality | 2026 |
| Backing It-Partner Da | Information & communication | 2005 |
| Backlog AS | | 2023 |
| Backlund Hotel Eiendom AS | Real estate | 2000 |
| Backout AS | Professional & scientific | 2019 |
| Backpacker AS | Administrative & support | 2020 |
| Backpedaling Holding AS | Manufacturing | 2024 |
| Backslash AS | | 2020 |
| Backspace AS | Information & communication | 2025 |
| Backstage AS | Arts & recreation | 2021 |
| Backstage Management Og Produksjon AS | Professional & scientific | 2007 |
| Backstube AS | Manufacturing | 2015 |
| Backtobasicstrening AS | Education | 2019 |
| Backtraqr AS | Information & communication | 2019 |
| Backupbuddy AS | Information & communication | 2023 |
| Backyard Studios Oslo AS | Information & communication | 2024 |
| Bacolod Forma AS | Professional & scientific | 2025 |
| Bacolod Holding AS | | 2020 |
| Bacon AS | Professional & scientific | 2005 |
| Bacon Lounge Studio & Production AS | Information & communication | 2025 |
| Bacon Osl AS | Information & communication | 2010 |
| Bacon Pictures Oslo AS | Information & communication | 2023 |
| Bacon Street AS | Financial services | 2013 |
| Bad & Bygg VVS Oslo AS | Construction | 2025 |
| Bad & Kjøkken Renovering AS | Construction | 2022 |
| Bad & Rørservice AS | Construction | 2021 |
| Bad & Sånt AS | Construction | 2023 |
| Bad Aass AS | | 2026 |
| Bad Bishop AS | Hospitality | 2018 |
| Bad High Fives Ventures AS | Professional & scientific | 2026 |
| Bad Monkeys Holding AS | Information & communication | 2020 |
| Bad Og Prosjekt AS | Construction | 2015 |
| Badebakken AS | | 2025 |
| Badehusgata 33-39 AS | Real estate | 2007 |
| Badelandene SA | Arts & recreation | 2004 |
| Bademiljø AS | Administrative & support | 2020 |
| Bademiljø Eiendom AS | Construction | 1998 |
| Badenymfene Baby Og Småbarnssvømming AS | Education | 2024 |
| Badenymfene Babysvømming Ans | Arts & recreation | 2003 |
| Baderom Og Oppussing AS | Construction | 2024 |
| Baderomsgutta AS | Construction | 2024 |
| Badestua AS | Administrative & support | 2015 |
| Badet Da | Real estate | 2004 |
| Badgalanini AS | | 2023 |
| Badgeland | Professional & scientific | 2010 |
| Badger AS | Information & communication | 1996 |
| Badio AS | Professional & scientific | 2026 |
| Badivuku Eiendom AS | Real estate | 2019 |
| Badstugata 7-9 AS | Real estate | 2006 |
| Badstugata Vedlikehold AS | Administrative & support | 2016 |
| Badstuvogna AS | Other services | 2020 |
| Badtaste AS | | 2011 |
| Bae Hotels AS | Hospitality | 2023 |
| Bae Systems Norway AS | Wholesale & retail | 2024 |
| BAE56 AS | Real estate | 2025 |
| Baert AS | Information & communication | 2025 |
| Baf Inv AS | | 2023 |
| Bafa Invest AS | Manufacturing | 2023 |
| Bafa Salgstjenester Ans | | 1993 |
| Baff AS | Professional & scientific | 2023 |
| Baff Holding AS | | 2023 |
| Bafi Holdings AS | | 2019 |
| Bag Holders Collective AS | Professional & scientific | 2025 |
| Bag IT AS | Professional & scientific | 2014 |
| Bag of Holding AS | Financial services | 2018 |
| Bag of Holdings AS | | 2022 |
| Bagatelle Holding AS | | 2021 |
| Bagel & Brew AS | Hospitality | 2025 |
| Bagelito Pilestredet AS | Hospitality | 2026 |
| Baggage Bug AS | Professional & scientific | 2023 |
| Bagger Invest AS | | 2024 |
| Baggins Venture AS | Financial services | 2021 |
| Bagh Invest AS | Professional & scientific | 2011 |