| Bålyveien Eiendom AS | Real estate | 2010 |
| Båndtvang AS | Professional & scientific | 2006 |
| Bård Bømark AS | Financial services | 1986 |
| Bård Gudim AS | Professional & scientific | 1998 |
| Bård Hansen Holding AS | Professional & scientific | 1986 |
| Bård Næss Holding AS | Health & social care | 2017 |
| Bård Skjørtorp AS | Real estate | 2016 |
| Bårdar - Akademiet for Musikk & Scenekunst AS | Education | 2026 |
| Bårdar Danseinstitutt AS | Education | 2003 |
| Bårdar West Coast Swing Club | Arts & recreation | 2012 |
| Bårdsgjerde Fryd&Lyd | Arts & recreation | 2013 |
| Bårnakkveien 1A Harstad AS | Real estate | 2016 |
| Båt.No Da | Professional & scientific | 2000 |
| Båtberget AS | | 2017 |
| Båtførerkurset AS | Education | 2022 |
| Båtkjølen Eiendom AS | Real estate | 2024 |
| Båtmotoren AS | Other services | 2002 |
| Båtservice Sightseeing AS | Administrative & support | 2007 |
| Båtsiden Da | Information & communication | 2000 |
| Båtstø Vann Og Avløp SA | Water & waste | 2008 |
| Båttassen Da | Real estate | 1997 |
| Bæck AS | Financial services | 2013 |
| Bækkelaget Holding AS | Real estate | 2005 |
| Bækkelaget Invest AS | | 2019 |
| Bækkelaget Sports- Og Kulturarena AS | Construction | 2018 |
| Bækkelund Råd AS | Professional & scientific | 2023 |
| Bæreglede AS | Wholesale & retail | 2011 |
| Bærekraftig Framtid AS | Professional & scientific | 2024 |
| Bærekraftig Investering AS | Professional & scientific | 2012 |
| Bærekraftig Kultur AS | Professional & scientific | 2026 |
| Bærekraftige Løsninger AS | Professional & scientific | 2025 |
| Bærekraftsavdelingen AS | Professional & scientific | 2026 |
| Bærug Invest AS | Financial services | 2016 |
| Bærum Bilservice Og Skade AS | Other services | 2020 |
| Bærum Boligutvikling AS | Real estate | 2021 |
| Bærum Entreprenør AS | Construction | 2016 |
| Bærum Osteopati AS | Health & social care | 2008 |
| Bærum Prosjekt- Og Eiendomsutvikling AS | Real estate | 2002 |
| Bærumsveien Bolig AS | Real estate | 2014 |
| Bø Teglverk AS | Real estate | 1981 |
| Bø Utvikling AS | Real estate | 2021 |
| Bøck Holding AS | Administrative & support | 2020 |
| Bødal AS | | 2022 |
| Bødalen Utvikling AS | Real estate | 2021 |
| Bøe Consulting AS | Professional & scientific | 2011 |
| Bøe Kapital AS | | 2025 |
| Bøen Kraft AS | Energy | 2005 |
| Bøesenteret AS | Real estate | 1988 |
| Bøgata 2 AS | Real estate | 2019 |
| Bøgata 20 AS | Real estate | 2005 |
| Bøhler Invest AS | Real estate | 1994 |
| Bøhmen Thema Consult Ans | Administrative & support | 1990 |
| Bøhmer AS | Financial services | 2018 |
| Bøhn Gruppen AS | Financial services | 2015 |
| Bøk Kapital AS | Financial services | 2010 |
| Bøk Oslo AS | Professional & scientific | 2017 |
| Bøkeskog Holding AS | | 2024 |
| Bøkevoll Eiendom AS | Real estate | 2008 |
| Bøkkerveien 2 AS | Real estate | 2011 |
| Bøkkerveien 4 AS | Real estate | 2021 |
| Bøkkerveien 5 AS | Real estate | 2014 |
| Bøkkerveien Parkering AS | Real estate | 2017 |
| Bøkonomics Holding AS | | 2025 |
| Bølakraft AS | Energy | 2019 |
| Bøle Enterprises AS | | 2020 |
| Bøler Fysikalske Institutt AS | Health & social care | 2022 |
| Bøler Garasjelag SA | Transport & logistics | 1960 |
| Bøler Hudpleie AS | Other services | 2005 |
| Bøler Legesenter AS | Health & social care | 2019 |
| Bøler Minilager AS | Real estate | 2017 |
| Bøler Renhold Da | Administrative & support | 2012 |
| Bøler Samfunnshus SA | Real estate | 1971 |
| Bøler Senter Næring AS | Real estate | 2005 |
| Bøler Synssenter AS | Wholesale & retail | 1989 |
| Bøler Zoo AS | Wholesale & retail | 2020 |
| Bølerlia Bolig AS | Real estate | 2025 |
| Bølerlia Tannlegesenter AS | Health & social care | 2018 |
| Bølerskogen Borettslag I Garasjelaget | Real estate | 1966 |
| Bølerskogen Borettslag Ii's Garasjelag SA | Transport & logistics | 1965 |
| Bølervegen 40 AS | | 2015 |
| Bølervegen AS | Real estate | 1985 |
| Bølerveien 24B AS | Real estate | 2018 |
| Bølerveien 61 AS | Real estate | 2017 |
| Bølerveien 63 AS | Real estate | 2012 |
| Bølerveien 65 AS | Real estate | 2014 |
| Bølerveien AS | Real estate | 2009 |
| Bølerveien Garasjelag SA | Real estate | 2018 |
| Bølevegen 204 AS | Real estate | 2024 |
| Bølgeblikk Arkitekter AS | Professional & scientific | 1986 |
| Bølgen & Berger AS | Professional & scientific | 2021 |
| Bølgen & Moi AS | Hospitality | 2000 |
| Bølgen & Moi Bodø AS | Hospitality | 2008 |
| Bølgen & Moi Gimle AS | Hospitality | 2000 |
| Bølgen & Moi Stavanger AS | Hospitality | 1999 |
| Bølgen & Moi Tjuvholmen AS | Hospitality | 2008 |
| Bølgen Økonomipartner AS | Professional & scientific | 2025 |
| Bølgetopp AS | Education | 2026 |
| Bøljanblå AS | Wholesale & retail | 2026 |
| Bølla Og Soulat Holding AS | Wholesale & retail | 2018 |
| Bølskog Invest AS | Information & communication | 2017 |