| Bjørke & Thorvaldsen Holding AS | Health & social care | 2017 |
| Bjørkelid Holding AS | Real estate | 2024 |
| Bjørnar Eretveit AS | | 2022 |
| Bjørnar Fredvik Holding AS | | 2025 |
| Bjørnbakk Service AS | Professional & scientific | 2026 |
| Bjørndal Gård Eiendom AS | Real estate | 2013 |
| Bjørndalen Barnehage AS | Education | 2017 |
| Bjørndalen Bileiendom AS | Real estate | 2015 |
| Bjørndalen Invest AS | Other services | 2005 |
| Bjørndalsheia 26 AS | Real estate | 2017 |
| Bjørndalsheia 36 Da | Real estate | 2006 |
| Bjørndalssletta Apotek AS | Wholesale & retail | 2023 |
| Bjørnebakken 5 Eiendom AS | Real estate | 2016 |
| Bjørnebakken AS | Wholesale & retail | 2015 |
| Bjørnenak AS | Financial services | 2013 |
| Bjørnholmen Og Indre Tronderøy Utbygging AS | Construction | 2017 |
| Bjørnhom Takst AS | Professional & scientific | 2022 |
| Bjørtvedt Eiendom AS | Real estate | 2017 |
| BK Elektro AS | Construction | 2016 |
| BK Tomteutvikling AS | Real estate | 2021 |
| Bkkb Holding AS | Wholesale & retail | 2005 |
| BL Fredriksen Holding AS | | 2025 |
| Blabb AS | Wholesale & retail | 2021 |
| Blank Marina Da | Manufacturing | 2025 |
| Blatchford Norway AS | Manufacturing | 2014 |
| Blatchford Ortopedi AS | Manufacturing | 2014 |
| Blaud AS | Administrative & support | 2021 |
| Blaud Holding AS | | 2024 |
| Blaudis AS | Administrative & support | 2025 |
| Blaudkokt AS | Administrative & support | 2025 |
| Blekkulf Barnehage Ans | Education | 1995 |
| Bles Holding AS | | 2020 |
| Bless Invest AS | Financial services | 2005 |
| Blikkbox AS | Wholesale & retail | 1991 |
| Blikkenslagerfirma Olaf Jahnsen AS | Construction | 1988 |
| Blikkenslagermester Jan Morten Ødegaard AS | Construction | 2015 |
| Blikkenslagermester Leif Hansen AS | Construction | 2020 |
| Blikkenslagermester Leif Hansen Holding AS | Administrative & support | 1988 |
| Bliksås AS | Real estate | 2012 |
| Blits AS | Professional & scientific | 2021 |
| Blivakker & Cocopanda Retail AS | Wholesale & retail | 2022 |
| Blivakker.No AS | Wholesale & retail | 2009 |
| BLM Holding AS | Financial services | 2015 |
| Blockmind AS | Information & communication | 2025 |
| Blomelle AS | Wholesale & retail | 2023 |
| Blomsbukta AS | Real estate | 2014 |
| Blomsbukta Utvikling AS | Real estate | 2016 |
| Blomsterdekor Kristiansand AS | Wholesale & retail | 2018 |
| Blomstergrossisten Sør AS | Agriculture & fishing | 2002 |
| Blomstertunet AS | Wholesale & retail | 1993 |
| Blondie Salongen AS | Other services | 2014 |
| Blsd Invest AS | | 2026 |
| Blue Innovation AS | Professional & scientific | 2016 |
| Blue Invest AS | Manufacturing | 2005 |
| Blue Office AS | Education | 2016 |
| Blush Studio AS | Professional & scientific | 2026 |
| Blå Kors Gjenbruk AS | Wholesale & retail | 2022 |
| Blåhyttene AS | Real estate | 2019 |
| Blø Holding AS | | 2021 |
| Bma Eiendom AS | Real estate | 2015 |
| Bmkr Holding AS | | 2020 |
| Bmo AS | | 2024 |
| Bo Greit AS | Construction | 2018 |
| Bo H. Bjaarstad AS | Professional & scientific | 2019 |
| Bo-Sam Konsulenttjenester AS | Information & communication | 2013 |
| Bodasto Invest AS | Real estate | 2010 |
| Boel Invest AS | | 2022 |
| Boen Foss AS | Energy | 1978 |
| Boen Invest AS | Information & communication | 2005 |
| Bofs Invest AS | Professional & scientific | 2020 |
| Boger Eiendom AS | Real estate | 1996 |
| Boger Holding AS | Financial services | 2005 |
| Boh Bygg AS | Construction | 2012 |
| Boh Eiendom AS | Real estate | 2012 |
| Boh Gruppen AS | Construction | 2022 |
| Boh Konzept AS | Real estate | 2020 |
| Bohavono AS | Real estate | 2020 |
| Boint AS | Transport & logistics | 2023 |
| Bois Eiendomsutvikling AS | Real estate | 2004 |
| Boki AS | Professional & scientific | 2021 |
| Bold Type Management AS | Professional & scientific | 2022 |
| Bolig 1 AS | Real estate | 2004 |
| Bolig Sør AS | Real estate | 2008 |
| Boligaksjeselskapet Festningsgaten 34 | Households | 1949 |
| Boligformidlingen Vest AS | Real estate | 1994 |
| Boligfotografer AS | Professional & scientific | 2021 |
| Boligmegleren AS | Real estate | 2017 |
| Boligmegleren Holding AS | | 2025 |
| Boligmegleren Stray AS | Real estate | 2002 |
| Boligstil AS | Administrative & support | 2015 |
| Boligtakst AS | Real estate | 2005 |
| Boligutleie Norge AS | Real estate | 2020 |
| Boligutleie Sør AS | Real estate | 2011 |
| Boligvelger AS | Information & communication | 2025 |
| Bolten AS | Wholesale & retail | 2016 |
| Bolten Holding AS | Real estate | 2023 |
| Boma Yetu AS | | 2022 |
| Bombom AS | Information & communication | 2015 |
| Bona Fortuna AS | | 2021 |
| Bondmar AS | Real estate | 2016 |