| Bryggesporens Skotøymagasin AS | Real estate | 1991 |
| Bryggestuen - Bryggeloftet Holding AS | | 2026 |
| Bråtet Software AS | | 2020 |
| Brækhus Holding AS | | 2005 |
| Brød & Vin Restaurant AS | Hospitality | 2002 |
| Brødrene Lohne Sølvvarefabrikk A/S | Manufacturing | 1988 |
| BS Arena AS | Real estate | 2007 |
| BS Capital AS | | 2021 |
| BSH Investering AS | | 2023 |
| BSK Bygg AS | Construction | 2024 |
| Bskipper AS | Hospitality | 2016 |
| BTG Arrow I AS | Transport & logistics | 2018 |
| BTG Arrow II AS | Transport & logistics | 2018 |
| BTG Arrow III AS | Transport & logistics | 2019 |
| BTG Arrow V AS | Transport & logistics | 2019 |
| BTG Pool AS | Transport & logistics | 2014 |
| Bts-Bergen Transport, Lager & Spedisjon AS | Transport & logistics | 2024 |
| Bu Comp Holding AS | Manufacturing | 2023 |
| Bublit AS | Information & communication | 2025 |
| Budal Bolig & Byfornying AS | Real estate | 1999 |
| Buddy Invest AS | Real estate | 2012 |
| Buen Bergen AS | Real estate | 2008 |
| Buenavida 2 AS | Real estate | 2023 |
| Buene Holding AS | Wholesale & retail | 2023 |
| Bueno Europe AS | Information & communication | 2022 |
| Bueno Group AS | Information & communication | 2020 |
| Builder Heart AS | Information & communication | 2021 |
| Builder Heart Drift AS | Information & communication | 2024 |
| Bulk Trading Group AS | Transport & logistics | 2019 |
| Bull Kapital AS | Real estate | 2011 |
| Bull- Olsen Invest AS | Professional & scientific | 2005 |
| Bulldog Consultants AS | Professional & scientific | 1998 |
| Bullit AS | | 2005 |
| Bunh AS | | 2021 |
| Bunnyboiler AS | | 2021 |
| Burger Boys AS | Hospitality | 2024 |
| Burgeren Teatergaten AS | Hospitality | 2022 |
| Burgerheim Group AS | Hospitality | 2023 |
| Burgerhuset AS | Hospitality | 2026 |
| Business Agility Consulting AS | Professional & scientific | 2022 |
| Business Automation Technology AS | Information & communication | 2025 |
| Business Solutions AS | Administrative & support | 2011 |
| Busnor AS | Wholesale & retail | 2013 |
| Busnor Invest 1 AS | Wholesale & retail | 2025 |
| Busnor Invest 2 AS | Wholesale & retail | 2025 |
| Busnor Norway AS | Wholesale & retail | 2025 |
| Busnor Stord AS | Other services | 2025 |
| Butikk Birkenes AS | Wholesale & retail | 2019 |
| Butikkdrift Akgeyik AS | Wholesale & retail | 2014 |
| Butikkdrift Kaliyugarasan AS | Wholesale & retail | 2017 |
| Butikkdrift Nygårdsgaten AS | Wholesale & retail | 2016 |
| Butikkdrift Shir Shah AS | Wholesale & retail | 2024 |
| Butikkdrift Thura AS | Wholesale & retail | 2026 |
| Butikkeiendom Vest AS | Real estate | 2009 |
| Buulo Mareer Da | Transport & logistics | 2024 |
| Buzz AS | Arts & recreation | 2010 |
| Buzz Tattoo AS | Real estate | 2017 |
| Buå AS | Real estate | 2012 |
| By Bygg AS | Real estate | 2005 |
| By Com AS | Administrative & support | 2000 |
| By Henny AS | Wholesale & retail | 2024 |
| Bybo AS | Real estate | 2007 |
| Bybubbly AS | Administrative & support | 2013 |
| Bye Bye Goliath Industries Ans | Information & communication | 2000 |
| Bye Invest AS | | 2021 |
| Byen AS | Financial services | 2005 |
| Byen Skredderi Nuf | Manufacturing | 2020 |
| Byfjorden Næringspark AS | Real estate | 1996 |
| Byfortetting AS | Real estate | 2018 |
| Bygg & Eiendom AS | Professional & scientific | 1987 |
| Bygg & Entreprenør Partner AS | Real estate | 2011 |
| Bygg Concept Oselvo AS | Real estate | 2017 |
| Bygg Og Renovering Jaroslaw Raczkowski AS | Construction | 2024 |
| Bygg Og Rørleggerservice AS | Construction | 2012 |
| Bygg Prosjekt AS | Professional & scientific | 2004 |
| Bygg, Rør & Anleggsservice AS | Construction | 2024 |
| Bygg-Gruppen AS | Construction | 2014 |
| Byggefirma Nilsen & Andersen AS | Construction | 1985 |
| Byggelaget Ved B T a AS | Households | 1952 |
| Byggmester Craig Foley AS | Construction | 2026 |
| Byggmester Fana AS | Construction | 2019 |
| Byggmester Grindeland AS | Construction | 2021 |
| Byggmester Harald Sårheim AS | Construction | 2008 |
| Byggmester Osland AS | Construction | 2024 |
| Byggmester Rune Vatle AS | Construction | 2005 |
| Byggmestrenes Servicekontor AS | Education | 1989 |
| Byggtapetsermester Stigen & Kronheim AS | Construction | 2016 |
| Byggventilasjon AS | Construction | 2020 |
| Byjuristen Rettshjelp AS | Professional & scientific | 2020 |
| Byks Norge Holding AS | Professional & scientific | 2015 |
| Byks Næringshavn AS | Professional & scientific | 2015 |
| Byland AS | Real estate | 2013 |
| Bymimmi AS | | 2025 |
| Bynight Ans | Information & communication | 2000 |
| Bypsykologene AS | Health & social care | 2013 |
| Byrommet AS | Real estate | 2024 |
| Bysom AS | | 2005 |
| Bysondre AS | Information & communication | 2026 |
| Balder AS | Financial services | 1962 |
| Brødr Rosenlund AS | Real estate | 1926 |