| Bjørn Arve Natland AS | | 2023 |
| Bjørn J. Hansen AS | Health & social care | 2013 |
| Bjørn J. Hansen Holding AS | Health & social care | 2012 |
| Bjørnereim Ventilasjon AS | Construction | 2021 |
| BK Angro AS | | 2016 |
| BK NL37 AS | Hospitality | 2022 |
| Bk-Holding AS | Real estate | 2019 |
| Bk-Tønsberg AS | Hospitality | 2021 |
| Blaas Holding AS | | 2023 |
| Blink Hus Tønsberg AS | Real estate | 2001 |
| Blodsjekk AS | Health & social care | 2020 |
| Blueberry Well AS | Health & social care | 2026 |
| Bluestone AS | Information & communication | 2000 |
| Bluetec AS | Construction | 2016 |
| BMC Eiendom AS | Real estate | 2012 |
| BMJ Investment AS | Real estate | 2022 |
| BMT Holdingselskap AS | Hospitality | 2024 |
| Bo Coliving AS | Real estate | 2020 |
| Bo Coliving Holding AS | Real estate | 2022 |
| Bo Coliving Møre Og Romsdal AS | Real estate | 2022 |
| Bo Coliving Trøndelag AS | Real estate | 2022 |
| Bo Coliving Ul AS | Real estate | 2023 |
| Bo Coliving Vestlandet AS | Real estate | 1965 |
| Bo Coliving Østlandet AS | Real estate | 2021 |
| Bo Newco AS | Real estate | 2024 |
| Bo Prosjekt AS | Real estate | 2024 |
| Boa Capital AS | | 2021 |
| Boatshow AS | Administrative & support | 2015 |
| Bob Trafikkskole Avd. Tønsberg AS | Education | 2012 |
| Boden Antik Ans | Wholesale & retail | 1993 |
| Bodhotell.No AS | Transport & logistics | 2014 |
| Body 'N' Balance AS | Health & social care | 2021 |
| Bogart AS | Wholesale & retail | 1992 |
| Bogart Invest AS | Wholesale & retail | 2005 |
| Bok Eiendom AS | Real estate | 2014 |
| Bok H AS | Professional & scientific | 2004 |
| Boligfoto AS | Professional & scientific | 2021 |
| Boligtakst Vestfold AS | Real estate | 2013 |
| Bombaytandoori AS | Hospitality | 2024 |
| Bong Ljungdahl AB | Wholesale & retail | 2006 |
| Boomr AS | Information & communication | 2021 |
| Boost Norge AS | Wholesale & retail | 2018 |
| Bopl AS | Manufacturing | 2021 |
| Borge & Borge AS | Construction | 1992 |
| Borge Eiendom AS | Real estate | 1965 |
| Borge Eier AS | | 2022 |
| Borgebu AS | Wholesale & retail | 2005 |
| Borges Rederi AS | Financial services | 1936 |
| Bossboss AS | | 2023 |
| Boxer Auto AS | Wholesale & retail | 2020 |
| BPG Chemicals AS | Manufacturing | 2023 |
| Braaten Eiendom AS | Real estate | 2008 |
| Braathen & Co Ans | Wholesale & retail | 1986 |
| Braathen Forlag AS | Professional & scientific | 2025 |
| Braathens Safe AS | | 1999 |
| Bramare AS | Real estate | 1995 |
| Bramidan & Presto AS | Wholesale & retail | 2015 |
| Branko Eiendom AS | Real estate | 2005 |
| Branova AS | Real estate | 1995 |
| Brattbakken 2 AS | Real estate | 2003 |
| Brattekleiv Invest AS | Real estate | 1998 |
| Breakfast AS | Professional & scientific | 2011 |
| Breili & Partnere AS | Professional & scientific | 2010 |
| Brendero Invest AS | | 2026 |
| Brevik Hybelhotell AS | Hospitality | 2017 |
| BRF Invest AS | Financial services | 2011 |
| Bridgebetween AS | Professional & scientific | 2012 |
| Bridgewise AS | Professional & scientific | 2022 |
| Brigg Holding AS | | 2024 |
| Brittania AS | Real estate | 2016 |
| Bror Holding AS | | 2019 |
| Bru Investment Holding AS | | 2019 |
| Brunsvik Eiendom AS | Real estate | 2008 |
| Brunthus AS | Wholesale & retail | 2010 |
| Brygga Food AS | Hospitality | 2025 |
| Brygga Invest Tønsberg AS | Real estate | 2018 |
| Brygga Kino AS | Information & communication | 2016 |
| Brygga Pizza AS | Hospitality | 2023 |
| Brygga Tønsberg Holding AS | Real estate | 2023 |
| Bryggebakken AS | Real estate | 2025 |
| Brødrene Hermansen Eiendom AS | Real estate | 2024 |
| Brødrene Nesset Holding AS | Financial services | 2013 |
| BS Bilpleie Ditec Tønsberg AS | Other services | 2001 |
| BS Møbler AS | Wholesale & retail | 2009 |
| Bsafe Emergency Management Software AS | Information & communication | 2016 |
| Bsafe Group AS | Information & communication | 2015 |
| BT Agenturer AS | Wholesale & retail | 2023 |
| BT Datatjenester Da | Information & communication | 2001 |
| Bubli AS | Wholesale & retail | 2026 |
| Buer Anlegg AS | Administrative & support | 2024 |
| Bugge & Klavenes AS | | 2020 |
| Bugge Hjorth & Partners AS | Professional & scientific | 1990 |
| Building Material Corporation Trading AS | Wholesale & retail | 1993 |
| Bukken Eiendom AS | Real estate | 2025 |
| Bulldok Ans | Health & social care | 2004 |
| Bullseye AS | Real estate | 2019 |
| Butikkdrift Mitslal Gebreyesus AS | Wholesale & retail | 2025 |
| Butikkdrift Paulsen AS | Wholesale & retail | 2015 |
| BVN22 AS | Financial services | 2017 |
| BWS Holding AS | Construction | 2004 |