| Boleyn Equestrian AS | Arts & recreation | 2024 |
| Boleyn Holding AS | Arts & recreation | 2012 |
| Bolia Norsk Avdeling Av Utenlandsk Foretak Nuf | Wholesale & retail | 2002 |
| Bolide AS | Information & communication | 2005 |
| Bolig Entreprenør AS | Construction | 2021 |
| Bolig Event AS | Real estate | 2025 |
| Bolig Giganten AS | Real estate | 2021 |
| Bolig Og Eiendomstakst AS | Real estate | 2004 |
| Bolig Og Næring AS | Construction | 2012 |
| Bolig Og Nærings Forvaltning AS | Real estate | 2018 |
| Bolig Proff AS | Construction | 2017 |
| Bolig Rykkinn AS | Real estate | 2016 |
| Bolig Taksering AS | Professional & scientific | 2013 |
| Bolig- Og Næringsmegler Næring AS | Real estate | 2009 |
| Bolig-Aksjeselskapet Bakkerudveien 13-15 | Real estate | 1949 |
| Bolig-Utleie AS | Real estate | 2016 |
| BOLIG4U AS | Wholesale & retail | 2018 |
| Boligaksjeselskapet Claus Riis GT 4 | Households | 1948 |
| Boligaksjeselskapet Claus Riisgate 2 | Households | 1950 |
| Boligaksjeselskapet Majorstuveien 12 | Households | 1955 |
| Boligaktieselskapet Bygdø Alle 51 | Households | 1916 |
| Boligby AS | Real estate | 2021 |
| Boligbyggelaget Lambo AS | Households | 1950 |
| Boligdama AS | Real estate | 2020 |
| Boligeiendom AS | Real estate | 1997 |
| Boligelektrikeren AS | Construction | 2011 |
| Boligenergi AS | Professional & scientific | 2010 |
| Boligfinans AS | Financial services | 2022 |
| Boligfinansiering AS | Professional & scientific | 2024 |
| Boligfondet AS | | 2020 |
| Boligforvalterne AS | Professional & scientific | 2011 |
| Boligforvaltning AS | Real estate | 2015 |
| Boliginnrederne AS | Professional & scientific | 2001 |
| Boliginstituttet AS | Professional & scientific | 1989 |
| Boliginvest AS | Real estate | 1994 |
| Boligkontroll AS | Real estate | 2023 |
| Boligkunst AS | Wholesale & retail | 2019 |
| Boligleier AS | Real estate | 2014 |
| Boligløft AS | Construction | 2026 |
| Boligmappa AS | Information & communication | 2012 |
| Boligmiks AS | Information & communication | 2021 |
| Boligområder AS | Real estate | 2012 |
| Boligrørleggeren AS | Construction | 2012 |
| Boligselskapet AS Heim | Households | 1968 |
| Boligselskapet Fagerheimsgaten 9 AS | Households | 1990 |
| Boligselskapet Gjetemyrsveien 9 AS | Households | 1917 |
| Boligsnekkeren AS | Construction | 2026 |
| Boligstigen I AS | Real estate | 2020 |
| Boligtilstand AS | Real estate | 2023 |
| Boligtomt Bogerud AS | Real estate | 2015 |
| Boligtomter AS | Real estate | 2012 |
| Boligutleie AS | Real estate | 1992 |
| Boligutleie Oslo Og Akershus AS | Real estate | 2005 |
| Boligutleie Øst AS | Real estate | 2018 |
| Boligutleiemarked Ans | Information & communication | 2001 |
| Boligutvikling AS | Real estate | 2022 |
| Boligutvikling Korshagen AS | Real estate | 2016 |
| Boligutvikling Sør AS | Real estate | 2014 |
| Boligverket AS | Manufacturing | 2024 |
| Bolikowski Holding AS | Information & communication | 2023 |
| Bolink AS | Information & communication | 2022 |
| Bolivar Brasserie AS | Hospitality | 2008 |
| Bolivar Eiendom AS | Real estate | 2008 |
| Bolla Invest AS | | 2026 |
| Bollholmen AS | Wholesale & retail | 2018 |
| Bolling Invest AS | Financial services | 2018 |
| Bollinger + Grohmann Ingeniører AS | Professional & scientific | 2015 |
| Bollingz Holdingz AS | | 2021 |
| Bollo AS | Professional & scientific | 2025 |
| Bollywood 2 Hollywood AS | Administrative & support | 2019 |
| Bologna Holding AS | Real estate | 2015 |
| Bolon Norway AS | Professional & scientific | 2019 |
| Bolsillo AS | Financial services | 2005 |
| Bolster Consulting AS | Professional & scientific | 2025 |
| Bolt AS | Arts & recreation | 2007 |
| Bolt Byggentreprenør AS | Construction | 1988 |
| Bolt Services No AS | Administrative & support | 2020 |
| Bolt Transport AS | Transport & logistics | 2025 |
| Bolteløkka Allé 1 AS | Real estate | 2017 |
| Bolteløkka Eiendom AS | Real estate | 2018 |
| Boltmetall AS | Professional & scientific | 2021 |
| Boly AS | Real estate | 2013 |
| Bolås Holding AS | | 2022 |
| Boma Invest AS | | 2021 |
| Bomann AS | Financial services | 2015 |
| Bomb Langø AS | | 2025 |
| Bombadil AS | | 2019 |
| Bombadil Holding AS | | 2021 |
| Bombadill Holding AS | Professional & scientific | 2023 |
| Bomega AS | Real estate | 2023 |
| Bomega Mipco AS | | 2023 |
| Bomer 34 AS | Real estate | 2023 |
| Bomer 36 AS | Real estate | 2023 |
| Bomer 37 AS | Real estate | 2023 |
| Bomer 38 AS | Real estate | 2024 |
| Bomer 39 AS | Real estate | 2024 |
| Bomer 60 AS | Real estate | 2025 |
| Bomer 61 AS | Real estate | 2025 |
| Bomer 64 AS | Real estate | 2026 |
| Bomer 65 AS | Real estate | 2026 |