| Buch Invest AS | | 2020 |
| Buchar AS | Real estate | 2022 |
| Buck Racing | Agriculture & fishing | 2017 |
| Buck Racing AS | Agriculture & fishing | 2022 |
| Bucket Holding AS | | 2021 |
| Bud 24 AS | Transport & logistics | 2024 |
| Budalen Ans | Real estate | 1990 |
| Budbringerne AS | Transport & logistics | 2026 |
| Budbygg AS | Construction | 2016 |
| Buddy Bike AS | Professional & scientific | 2014 |
| Buddy Electric AS | Wholesale & retail | 2010 |
| Buddy Mobility AS | Information & communication | 2017 |
| Buddysound AS | Arts & recreation | 2014 |
| Budelli AS | Other services | 2020 |
| Budly AS | Information & communication | 2023 |
| Budnik AS | | 2025 |
| Budowa AS | Construction | 2014 |
| Budu AS | Professional & scientific | 2023 |
| Bueland Invest AS | Financial services | 2016 |
| Buen Bar AS | Hospitality | 2022 |
| Buenaventura AS | Wholesale & retail | 1996 |
| Buene AS | Professional & scientific | 2016 |
| Bueno Transport AS | Water & waste | 2006 |
| Buer Gallery AS | Wholesale & retail | 2020 |
| Buer Holding AS | | 2018 |
| Buer Vase AS | Professional & scientific | 2005 |
| Buervegen 14 AS | | 2025 |
| Buest AS | | 2020 |
| Buffer Eiendom AS | Real estate | 1984 |
| Bufo AS | Real estate | 1996 |
| Bugbytes AS | Administrative & support | 2012 |
| Bugfix AS | | 2025 |
| Bugge & Authen Juvelerverksted AS | Manufacturing | 2012 |
| Bugge & Ravn Arkitekter AS | Professional & scientific | 2011 |
| Bugge Invest AS | | 2026 |
| Bugge Plastikkirurgi AS | Health & social care | 2010 |
| Bugge-Bygg AS | Construction | 1979 |
| Bugges Room AS | Information & communication | 1997 |
| Buggis Invest AS | Real estate | 2006 |
| Buheii Vindkraft AS | Energy | 2010 |
| Buhl AS | Professional & scientific | 2019 |
| Buhovd AS | Professional & scientific | 2006 |
| Bui AS | Information & communication | 2024 |
| Buie Shipping Ltd | Transport & logistics | 1995 |
| Build AS | Information & communication | 2022 |
| Build-A-Bear Workshop Inc | Wholesale & retail | 2008 |
| Builders AS | Real estate | 2021 |
| Building Block AS | Construction | 2017 |
| Building Block Norge AS | Construction | 2020 |
| Buildings and Food AS | | 2023 |
| Buildit AS | Information & communication | 2011 |
| Buildmorocco AS | Professional & scientific | 2024 |
| Buildright AS | Education | 2022 |
| Buildry AB | Administrative & support | 1995 |
| Built Arkitekter AS | Professional & scientific | 2023 |
| Built in Silence AS | Professional & scientific | 2025 |
| Builtby AS | Professional & scientific | 2013 |
| Bukett AS | | 2023 |
| Bukholm Invest AS | | 2019 |
| Bukkemyrveien 4 AS | | 2025 |
| Bukken Bruse Barnehage SA | Education | 1950 |
| Bukken Og Havresekken Da | Administrative & support | 1997 |
| Bukken Vinbar AS | Hospitality | 2023 |
| Bukkesteinen AS | Professional & scientific | 2017 |
| Buko Kontroll Ans | | 1994 |
| Bukono AS | Real estate | 2006 |
| Bukta Bar & Pizza AS | Hospitality | 2026 |
| Bulavas Olsen AS | Professional & scientific | 2017 |
| Buldreheim AS | | 2023 |
| Buldring AS | Education | 2023 |
| Bulgaria Property Fund AS | Professional & scientific | 2005 |
| Buljonggruppen AS | Hospitality | 2015 |
| Bulk Ausenfjell AS | Real estate | 2006 |
| Bulk Berger IV AS | Real estate | 2013 |
| Bulk Danebuåsen AS | Real estate | 2021 |
| Bulk Data Centers Arendal AS | Information & communication | 2026 |
| Bulk Data Centers AS | Information & communication | 2015 |
| Bulk Data Centers N01 AS | Information & communication | 2016 |
| Bulk Data Centers N01 DCM101 AS | Information & communication | 2023 |
| Bulk Data Centers N01 DCM102 AS | Information & communication | 2024 |
| Bulk Data Centers N01 DCM103 AS | Information & communication | 2024 |
| Bulk Data Centers N01 DCM401 AS | Information & communication | 2025 |
| Bulk Data Centers N01 Power AS | Construction | 2016 |
| Bulk Data Centers Os-Ix AS | Information & communication | 2019 |
| Bulk Eiendom I AS | Real estate | 2026 |
| Bulk Eiendom II AS | Real estate | 2026 |
| Bulk Eiendom Vestby II AS | Real estate | 2006 |
| Bulk Eikhaugen Nord AS | | 2022 |
| Bulk Enebakk A2 AS | Information & communication | 2024 |
| Bulk Enebakk AS | Real estate | 2021 |
| Bulk Enebakk I AS | Real estate | 2010 |
| Bulk Fiber Networks AS | Information & communication | 2015 |
| Bulk Gardermoen IV AS | Real estate | 2015 |
| Bulk Herstua AS | | 2024 |
| Bulk Holding AS | Wholesale & retail | 2018 |
| Bulk Industrial Real Estate AS | Real estate | 2015 |
| Bulk Industrier AS | | 2021 |
| Bulk Infrastructure Group AS | Real estate | 2019 |
| Bulk Infrastructure Holding AS | Information & communication | 2011 |
| Bulk Loaders AS | Transport & logistics | 2005 |