| Bitteliten Marihøna Familiebarnehage AS | Education | 2023 |
| Bitteliten Merkur Familiebarnehage AS | Education | 2023 |
| Bitteliten Saturn Familiebarnehage AS | Education | 2005 |
| Bitten Bua Ans | Wholesale & retail | 1992 |
| Bitter Holding AS | | 2022 |
| Bittersøt AS | Hospitality | 2023 |
| Bitvikler AS | Information & communication | 2017 |
| Bivitri AS | | 2026 |
| Bivo Consulting AS | | 2017 |
| Bivy Ventures AS | | 2025 |
| Bivåne AS | | 2022 |
| Bixby Holding AS | Real estate | 2005 |
| Biyonafs AS | Wholesale & retail | 2023 |
| Biz Bil AS | Wholesale & retail | 2021 |
| Biz Invest AS | Financial services | 2005 |
| Bizboost AS | Professional & scientific | 2025 |
| Bizmonk Holding AS | | 2019 |
| Bizon Holding AS | Information & communication | 2023 |
| Bizzy Holding AS | | 2026 |
| BJ Bygg AS | Construction | 2022 |
| BJ Holding AS | Real estate | 2014 |
| BJ Konsult AS | Professional & scientific | 2017 |
| BJ Ruud-Pedersen AS | Transport & logistics | 1939 |
| BJ Sprinkler AS | Professional & scientific | 2013 |
| BJ Syversen AS | Professional & scientific | 2026 |
| BJ Weider Invest AS | | 2021 |
| BJ. Bjørnsonsgt. 84 AS | Real estate | 2014 |
| Bja Rådgivning AS | Professional & scientific | 2023 |
| Bjaaland AS | | 2020 |
| Bjaaland Invest AS | Financial services | 2018 |
| Bjaas Bolig AS | Real estate | 2012 |
| Bjarga AS | Wholesale & retail | 2025 |
| Bjarke Ingels Group Oslo Nuf | Professional & scientific | 2024 |
| Bjarkum AS | Wholesale & retail | 2021 |
| Bjarne Borghild AS | | 2024 |
| Bjarne Eiendom AS | Real estate | 2013 |
| Bjarne Grimstad AS | Professional & scientific | 2015 |
| Bjarne Muri AS | | 2022 |
| Bjarto AS | Real estate | 2020 |
| Bjartulf AS | Real estate | 2011 |
| Bjartulf Venture AS | | 2021 |
| Bjartveit Invest AS | | 2024 |
| Bjazzco AS | Wholesale & retail | 2013 |
| Bjcr AS | Professional & scientific | 2022 |
| BJD Holding AS | Health & social care | 2024 |
| Bjeff AS | Professional & scientific | 2022 |
| Bjelin Norway AS | Wholesale & retail | 2021 |
| Bjella Invest AS | Real estate | 2017 |
| Bjelland Design Studio AS | Real estate | 2017 |
| Bjelvika AS | | 2024 |
| Bjerckebakken AS | | 2024 |
| Bjerg Arkitektur AS | Professional & scientific | 2020 |
| Bjerghuset AS | | 2005 |
| Bjerk AS | Information & communication | 2012 |
| Bjerk Capital AS | Financial services | 2017 |
| Bjerkaas Invest AS | | 2021 |
| Bjerkan Mobilitet AS | Professional & scientific | 2025 |
| Bjerkbæk Invest AS | | 2021 |
| Bjerke Bogstadveien AS | Real estate | 2005 |
| Bjerke Bolig AS | Real estate | 2025 |
| Bjerke Capital AS | Real estate | 2025 |
| Bjerke Dannevigsveien AS | Real estate | 2006 |
| Bjerke Dyrehospital AS | Professional & scientific | 2007 |
| Bjerke Eiendom AS | Real estate | 2017 |
| Bjerke Eiendomsservice AS | Administrative & support | 2003 |
| Bjerke Entreprenør AS | Construction | 2024 |
| Bjerke Fysio- Og Manuellterapi AS | Health & social care | 2025 |
| Bjerke Grefsenkvartalet AS | Real estate | 2006 |
| Bjerke Gruppen AS | Real estate | 2018 |
| Bjerke Grønnegate AS | Real estate | 1989 |
| Bjerke Gård Terapi Og Trenings- Senter AS | Education | 2003 |
| Bjerke Hammerstadsgate AS | Real estate | 2006 |
| Bjerke Image AS | Wholesale & retail | 1989 |
| Bjerke Industrier AS | Real estate | 1997 |
| Bjerke Interiør Design AS | Manufacturing | 2019 |
| Bjerke Investeringer AS | | 2021 |
| Bjerke Kjellemo Holding AS | | 2024 |
| Bjerke Larviksgate AS | Real estate | 2006 |
| Bjerke Legesenter Da | Health & social care | 2002 |
| Bjerke Lowzow Von Ahnen Advokatfirma AS | Professional & scientific | 2020 |
| Bjerke Maridalsveien AS | Real estate | 2006 |
| Bjerke Mat Senter AS | Wholesale & retail | 2020 |
| Bjerke Nord AS | Arts & recreation | 2022 |
| Bjerke Panorama AS | Real estate | 2001 |
| Bjerke Pilestredet AS | Real estate | 2006 |
| Bjerke Privatundervisning AS | Education | 2019 |
| Bjerke Renholdstjenester AS | Administrative & support | 2013 |
| Bjerke Rør AS | Construction | 2016 |
| Bjerke Smådyr AS | Professional & scientific | 2015 |
| Bjerke Sushi AS | Hospitality | 2026 |
| Bjerke Sushi Wok Restaurant AS | Hospitality | 2019 |
| Bjerke Syd AS | Administrative & support | 2022 |
| Bjerke Tannmedisin AS | Health & social care | 2004 |
| Bjerke Tjenester AS | Transport & logistics | 2025 |
| Bjerke Trav AS | Other services | 2022 |
| Bjerke Travbane AS | Arts & recreation | 2023 |
| Bjerke Travbane Eiendom AS | Real estate | 1925 |
| Bjerke Utvikling AS | Real estate | 2020 |
| Bjerke Ventilasjon AS | Construction | 2004 |
| Bjerke Village AS | Real estate | 2024 |