| Avarn Security Teknikk Sør AS | Construction | 1997 |
| Ave Eiendom AS | Real estate | 2017 |
| Aventium AS | Real estate | 2024 |
| Avivitae AS | Professional & scientific | 2024 |
| Avm Valves AS | Manufacturing | 2006 |
| Avolare AS | Arts & recreation | 2025 |
| Aanonsen Jernvarer AS | Wholesale & retail | 1988 |
| B&J Eiendom AS | Real estate | 2023 |
| B-Auto AS | Wholesale & retail | 2024 |
| B. Svartdal Invest AS | Real estate | 2018 |
| B.I. Regnskapsservice AS | Professional & scientific | 2007 |
| B.Young Retail Norway AS | Wholesale & retail | 1996 |
| Badshah AS | Hospitality | 2020 |
| Baga Eiendom AS | Real estate | 2007 |
| Baglergaten 1 Holding AS | Financial services | 2005 |
| Baglo Holding AS | Real estate | 2021 |
| Baila Comigo Ans | Wholesale & retail | 2008 |
| Bakke Sørvik & Partners AS | Real estate | 2016 |
| Baksåsveien Park AS | Real estate | 2014 |
| Balanzia AS | Administrative & support | 2013 |
| Ballari AS | | 2026 |
| Bambino Ans | | 1988 |
| Bamse AS | Wholesale & retail | 1961 |
| Barbo Olsen Invest AS | Financial services | 2018 |
| Bare Barista Kaffebar AS | Hospitality | 2009 |
| Barkveien 4A AS | Real estate | 2016 |
| Barkveien Handel AS | Real estate | 2025 |
| Barkveien Næring AS | Real estate | 2025 |
| Barkåker D12 AS | Real estate | 2026 |
| Barkåker Hage AS | Real estate | 2021 |
| Barkåker IT Park AS | Real estate | 2000 |
| Barlind Investment AS | | 2021 |
| Barlindveien 22 AS | Real estate | 2005 |
| Basberg Invest AS | Construction | 2019 |
| Basbergveien 160 AS | Real estate | 2009 |
| Basbergveien 54 AS | Real estate | 2013 |
| Bauer Investments AS | | 2022 |
| Bautz Holding AS | | 2014 |
| Bayatree AS | Information & communication | 2021 |
| BB Firmagaver AS | Wholesale & retail | 2020 |
| Beats 'N Lights Da | Arts & recreation | 2016 |
| Beau Norge Ans | Manufacturing | 2001 |
| Beauty Medical Care AS | Health & social care | 2015 |
| Beauty Supply AS | Wholesale & retail | 2016 |
| Bechmann Strømmen AS | Manufacturing | 2021 |
| Beck Osteopatisk Medisin AS | Health & social care | 2025 |
| Beck's Solution AS | | 2025 |
| Becks Holding AS | Professional & scientific | 2024 |
| Bedoir Studios AS | Professional & scientific | 2023 |
| Bedriftsmegling Norden Da | Real estate | 2000 |
| Bee Group AS | Administrative & support | 2019 |
| Begu Holding AS | | 2020 |
| Bekkeveien 200 AS | Real estate | 2012 |
| Bekkeveien Eiendom AS | Real estate | 2006 |
| Belmar Barnehage AS | Education | 2008 |
| Bema Group AS | Real estate | 2015 |
| Bendik Molnes AS | Professional & scientific | 2025 |
| Bent Honning Holding AS | | 2015 |
| Bentsrudveien 19 AS | Real estate | 1996 |
| Bentsrudveien 8 AS | Real estate | 2007 |
| Beo Invest AS | Real estate | 2021 |
| Berg AS | Wholesale & retail | 1987 |
| Berg-Hansen Reisebureau Vestfold AS | Administrative & support | 1961 |
| Bergan Vekst AS | Financial services | 2012 |
| Bergen Bolig AS | Real estate | 2025 |
| Bergeruds Døtre Ans | Agriculture & fishing | 1995 |
| Berges Skinny Bitch AS | Wholesale & retail | 2021 |
| Bergh Norway AS | Wholesale & retail | 1999 |
| Bergh Norway Eiendom AS | Real estate | 2021 |
| Berglund Eiendom AS | Real estate | 2005 |
| Bergmanns Tønsberg AS | Hospitality | 2023 |
| Bertel O. Steen Vestfold Og Telemark AS | Other services | 1967 |
| Better Societies Holding AS | Professional & scientific | 2018 |
| Bettum Invest AS | Real estate | 2007 |
| Betty Blue AS | Wholesale & retail | 1986 |
| Bharca AS | Real estate | 2012 |
| Biernes Eiendom AS | Real estate | 2020 |
| Big B Invest AS | Real estate | 2016 |
| Big Ben AS | Hospitality | 2006 |
| Bilberging Vestfold AS | Transport & logistics | 2015 |
| Bilfoto AS | Professional & scientific | 2014 |
| Bilpleiegruppen AS | Wholesale & retail | 1989 |
| Bio-Information Technology AS | Professional & scientific | 1985 |
| Biologisk AS | Wholesale & retail | 2022 |
| Biologisk Holding AS | Wholesale & retail | 2022 |
| Biowater Technology AS | Professional & scientific | 2007 |
| Bits Arkitekt Og Ingeniør AS | Professional & scientific | 2014 |
| Bivrost Film & TV AS | Information & communication | 2000 |
| Bivrost Film AS | Information & communication | 2018 |
| Bjarne W. Sørensen AS | Construction | 2015 |
| Bjarøy Classic AS | Wholesale & retail | 2017 |
| Bjarøy Eiendom AS | Real estate | 2006 |
| Bjarøy Gruppen AS | Real estate | 2020 |
| Bjarøy Handel AS | Wholesale & retail | 2022 |
| Bjarøy Kapital AS | Real estate | 2022 |
| Bjbryne AS | Health & social care | 2017 |
| Bjerkan Blikk AS | Construction | 2020 |
| BJH - Arkitekter AS | Professional & scientific | 2011 |
| Bjørg Klemetsdal AS | Health & social care | 2010 |
| Bjørkedal Holding AS | | 2024 |