| Axiom Capital AS | | 2026 |
| Axon Holding AS | | 2021 |
| Axon Prosjekt AS | Professional & scientific | 2025 |
| Axum Ans | Real estate | 2006 |
| Axxell Consulting Ans | Information & communication | 2008 |
| Aydin Invest AS | Real estate | 2014 |
| Ayyo Holding AS | | 2025 |
| Aza Holding AS | Arts & recreation | 2011 |
| Azd Holding AS | Financial services | 2018 |
| Azets Consulting AS | Professional & scientific | 2008 |
| Arkitektgruppen Cubus A/S | Professional & scientific | 1988 |
| B & H Eiendom AS | Real estate | 2017 |
| B Ark AS | Professional & scientific | 1990 |
| B Fondenes Aut Rørleggerfirma AS | Construction | 1989 |
| B Friele & Sønner AS | Real estate | 1911 |
| B&G Consulting Ans | Administrative & support | 2007 |
| B&T Signaal Aps | Information & communication | 2015 |
| B+B Arkitekter AS | Professional & scientific | 2011 |
| B-Gruppen AS | Wholesale & retail | 2022 |
| B-Light AS | Wholesale & retail | 2024 |
| B-Utvikling AS | Real estate | 2024 |
| B. Gullaksen Mur & Flis AS | Construction | 2023 |
| B. Vest Utvikling AS | Construction | 2024 |
| B.Jensen Invest AS | | 2025 |
| Baba Dumplings AS | Hospitality | 2025 |
| Baban AS | Manufacturing | 2019 |
| Baby Group AS | Financial services | 2017 |
| Baby Heartless Da | Arts & recreation | 2021 |
| Babyshop Sengemagasinet AS | Mining & quarrying | 1986 |
| Bach AS | Wholesale & retail | 1997 |
| Back of House AS | Administrative & support | 2024 |
| Back to Beat Records Da | Information & communication | 2014 |
| Backe Bergen AS | Construction | 2010 |
| Backe BMB AS | Construction | 2008 |
| Backpacker Reisemagasin Ans | Information & communication | 2001 |
| Backroad AS | Information & communication | 2024 |
| Bad Investments AS | | 2021 |
| Bad Ninja AS | Information & communication | 2019 |
| Bagad AS | Financial services | 1998 |
| Bagco Holding AS | | 2019 |
| Bagels Holding AS | | 2023 |
| Bakea AS | | 2026 |
| Bakeri 29 AS | Manufacturing | 2024 |
| Bakervik Eiendom AS | Real estate | 2009 |
| Bakka Advokatfirma AS | Professional & scientific | 2024 |
| Bakke & Nesheim Teppelageret Ans | | 1992 |
| Baktus Holding AS | Health & social care | 2017 |
| Balancial AS | | 2020 |
| Balandin Holding AS | | 2025 |
| Balandin Invest Nuf | Professional & scientific | 2008 |
| Balder Betaling AS | Financial services | 2017 |
| Balder Produksjon Og Logistikk AS | Arts & recreation | 2025 |
| Balkongentreprenøren AS | Construction | 2009 |
| Ballplay AS | Professional & scientific | 2015 |
| Baloo Consulting AS | Professional & scientific | 2024 |
| Balsam AS | Other services | 2023 |
| Bam Invest AS | Professional & scientific | 2005 |
| Bambi AS | Hospitality | 2022 |
| Bandadalen 2 Utbygging AS | Real estate | 2023 |
| Bandet Ekkolodd Da | Arts & recreation | 2014 |
| Bandet for by Og Bygd Da | Arts & recreation | 2020 |
| Banetjeneste AS | Professional & scientific | 2021 |
| Banevakt AS | Professional & scientific | 2021 |
| Baneveien 16 Holding AS | Real estate | 2021 |
| Bang Invest AS | | 2026 |
| Bang Takst AS | Professional & scientific | 2026 |
| Bangkok Skyline AS | Hospitality | 2022 |
| Bankadvisor AS | Professional & scientific | 2018 |
| Bankenes Id-Tjeneste AS | Information & communication | 2005 |
| Banus Eiendom AS | Real estate | 2008 |
| Banus Holding AS | Real estate | 2022 |
| Banzha AS | Hospitality | 2021 |
| Bar Sushi AS | Hospitality | 2000 |
| Bara Eiendom AS | Real estate | 1998 |
| Bara Tech AS | Information & communication | 2026 |
| Barber Graft AS | Other services | 2025 |
| Barca Hjetland Invest AS | Financial services | 2017 |
| Barca Invest AS | Financial services | 2003 |
| Barci Invest AS | Financial services | 2003 |
| Barcode 115 AS | Real estate | 2008 |
| Barcode 121 Hjemmel AS | Real estate | 2016 |
| Barcode 123 AS | Real estate | 2008 |
| Barcode 123 Holding AS | Real estate | 2006 |
| Barde AS | Professional & scientific | 2003 |
| Bardus Saus AS | Manufacturing | 2021 |
| Bare Bolig AS | Real estate | 2025 |
| Bargruppen AS | Hospitality | 2006 |
| Bargruppen Drift AS | Hospitality | 2016 |
| Baring Invest AS | Financial services | 2003 |
| Barjo Invest AS | Financial services | 2003 |
| Barma Invest AS | Financial services | 2003 |
| Barn I Byen Kulturformidling AS | Information & communication | 2001 |
| Barnevernfaglig AS | Health & social care | 2019 |
| Barracuda AS | Wholesale & retail | 2004 |
| Barstad Invest AS | Real estate | 2005 |
| Bart Clavier Da | Arts & recreation | 2014 |
| Bas Eiendom AS | Real estate | 1996 |
| Basic Care AS | Other services | 2013 |
| Basq AS | Hospitality | 2020 |
| Basso Bergen AS | Hospitality | 2022 |