| Brødrene Hansen Graveservice AS | Construction | 1996 |
| Brødrene Isolering AS | Construction | 2015 |
| Brødrene Jensen Bolig AS | Real estate | 2025 |
| Brødrene Jensen Fond AS | | 2025 |
| Brødrene Jensen Investor AS | Real estate | 2020 |
| Brødrene Jensen Management AS | Professional & scientific | 2015 |
| Brødrene Jensen Næring AS | | 2025 |
| Brødrene Jensen Selskap AS | Information & communication | 2018 |
| Brødrene Jensen Selskap III AS | | 2024 |
| Brødrene Jensen Selskap III Holding AS | | 2020 |
| Brødrene Kjølberg AS | Real estate | 2026 |
| Brødrene KK Eiendom AS | Real estate | 2018 |
| Brødrene Nyquist Ans | Transport & logistics | 2003 |
| Brødrene Placht AS | Real estate | 1981 |
| Brødrene Saga AS | Construction | 2025 |
| Brødrene Sam Eiendom AS | Real estate | 1998 |
| Brødrene Simonsen Ans | Hospitality | 1992 |
| Brødrene Thorkildsen AS | Wholesale & retail | 1998 |
| Brødrene Thorsvik Da | Construction | 1989 |
| Brødrene Tohje Ans | Construction | 1991 |
| Brødrerna Paulsson Peab AB | | 2001 |
| Brøgger Bergem Holding AS | | 2022 |
| Brønmo Holding AS | Real estate | 2005 |
| Brønnen 13 | Financial services | 2005 |
| Brønnerød Terrasse AS | Real estate | 2020 |
| Brønnstabilisering AS | Professional & scientific | 2023 |
| Brønnvegen 10 AS | Real estate | 2019 |
| Brønstad Holding AS | | 2022 |
| Brøset Nord Felt 1 AS | Real estate | 2024 |
| Brøset Utvikling AS | Real estate | 2019 |
| Brøsetveien 150 B AS | Real estate | 2012 |
| Brøter AS | Wholesale & retail | 2013 |
| Brøvigs Rederi AS | | 2021 |
| Brøyn Holding AS | Professional & scientific | 2005 |
| Brøyt Byrå AS | Professional & scientific | 2024 |
| Brøyte.No AS | Information & communication | 2017 |
| Brøytivei AS | Administrative & support | 2023 |
| Brûlée AS | Information & communication | 2020 |
| BS Ankre Holding AS | Other services | 2020 |
| BS Bidco AS | Wholesale & retail | 2021 |
| BS Bygg & Eiendom AS | Construction | 2025 |
| BS E-Bok AS | Professional & scientific | 2022 |
| BS Eiendom AB20 AS | Real estate | 2010 |
| BS Eiendom Invest AS | Real estate | 2010 |
| BS Eiendomsutvikling AS | Real estate | 1989 |
| BS Eurobib AS | Wholesale & retail | 2000 |
| BS Everest AS | Administrative & support | 2022 |
| BS Kapital AS | | 2024 |
| BS Mal Og Vedlikehold AS | Construction | 2013 |
| BS Midco AS | Wholesale & retail | 2021 |
| BS Qureshi AS | Hospitality | 2025 |
| Bsa Handel AS | Real estate | 2007 |
| Bsa Shipping Agencies Ans | Transport & logistics | 1999 |
| Bsa Storhandel AS | Real estate | 2009 |
| BSB AS | Wholesale & retail | 2017 |
| BSC AS | | 2024 |
| BSD Invest AS | | 2022 |
| Bse Fritid AS | Real estate | 2012 |
| Bsecure AS | Administrative & support | 2012 |
| BSG Investment Management AS | | 2023 |
| BSH Capital Invest AS | | 2025 |
| BSH Husholdningsapparater AS | Wholesale & retail | 1987 |
| BSH Invest AS | Information & communication | 2010 |
| Bshc AS | Financial services | 2017 |
| Bshs Invest AS | | 2017 |
| BSJ Holding AS | Financial services | 2017 |
| Bsj-Holding AS | | 2021 |
| BSN AS | Real estate | 2005 |
| BSN Holding AS | Wholesale & retail | 2005 |
| BSN Invest AS | Real estate | 2011 |
| BSP Eiendom AS | Real estate | 2016 |
| BSP Foodline Nuf | Professional & scientific | 2015 |
| Bspoke AS | Information & communication | 2013 |
| BSR Invest AS | Professional & scientific | 2012 |
| BSR Investor AS | Professional & scientific | 2012 |
| BST Norway AS | Construction | 2023 |
| Bstate AS | Real estate | 2015 |
| BSV Holding AS | | 2021 |
| BT Bygg Og Montasje AS | Construction | 2021 |
| BT Eiendomsinvest AS | Real estate | 2019 |
| BT Gulltid AS | Wholesale & retail | 1992 |
| BT Nordbyveien AS | Real estate | 2007 |
| BT Prosjekt AS | Wholesale & retail | 1996 |
| BT Solutions Norway AS | Information & communication | 2000 |
| BT Trading AS | Wholesale & retail | 2005 |
| BT4 Prosjekt AS | Real estate | 2021 |
| BTA11 AS | | 2024 |
| BTB Byggtjenester & Bemanning AS | Construction | 2019 |
| BTB MALERSERVICE ANS Bjørn O Rugsveen, Tommy Fagerheim, Bjørn Grue | Construction | 1991 |
| BTC Entreprenør AS | Construction | 2026 |
| BTG Invest AS | Wholesale & retail | 2005 |
| BTG Kamsarmax AS | Transport & logistics | 2022 |
| BTH International AS | Real estate | 2015 |
| BTH Inv AS | Financial services | 2017 |
| Bti Konsult AS | Real estate | 2012 |
| Btig Norway AS | Financial services | 2018 |
| BTK Anlegg AS | Construction | 2012 |
| BTK Invest AS | Arts & recreation | 2017 |
| Btkameratene AS | Professional & scientific | 2023 |
| Bto Consulting AS | Information & communication | 2017 |