| Avk Norge AS | Wholesale & retail | 1983 |
| Awt Holding AS | | 2012 |
| Ax Invest AS | | 2026 |
| Axdata Holding 3 AS | Information & communication | 2001 |
| Axentia AS | Wholesale & retail | 2011 |
| Azane Fuel Solutions AS | Professional & scientific | 2021 |
| Andreas Stihl A/S | Wholesale & retail | 1987 |
| Arne Rød & CO AS | Construction | 1979 |
| B Og B Holding AS | Professional & scientific | 2008 |
| B Og M Eiendom AS | Real estate | 2006 |
| B Storm AS | Financial services | 2015 |
| B&B Media Da | Professional & scientific | 2024 |
| B&B Stillasutleie AS | Construction | 2002 |
| B&Bj AS | Health & social care | 2010 |
| B&G Strong AS | Real estate | 1999 |
| B-Tec AS | Wholesale & retail | 2018 |
| B.B.Service AS | Real estate | 2010 |
| B.I. Bolig AS | Real estate | 2018 |
| B.I. Næring AS | Real estate | 2018 |
| B.R.Maler Og Renhold Service AS | Construction | 2026 |
| Baak AS | Wholesale & retail | 2022 |
| Baak Auto AS | Wholesale & retail | 2023 |
| Baak Invest AS | Wholesale & retail | 2026 |
| Baas Invest AS | | 2022 |
| Baatholmen AS | Manufacturing | 2007 |
| BABY BJØRN AB Norsk avdeling av utenlandsk foretak | Wholesale & retail | 1997 |
| Babyland | Wholesale & retail | 2019 |
| Bach Invest AS | Financial services | 2018 |
| Back in Business Ans | Arts & recreation | 2010 |
| Backe Vestfold Telemark AS | Construction | 2015 |
| Baj-Jas AS | Information & communication | 2018 |
| Bakerwilcox Nuf | Professional & scientific | 2024 |
| Bakgården Cafe AS | Hospitality | 2007 |
| Balance Works Global AS | Information & communication | 2024 |
| Balen Auto AS | Wholesale & retail | 2026 |
| Ballke Invest AS | Real estate | 2018 |
| Balloptikon AS | | 2020 |
| Baltazar Consulting AS | Professional & scientific | 2006 |
| Baltzeberg Regnskap AS | Professional & scientific | 2013 |
| Bamble Boligutvikling AS | Real estate | 2015 |
| Bana Holding AS | Financial services | 2018 |
| Bankbyggene Sandefjord AS | Real estate | 2015 |
| Bantos AS | Construction | 2010 |
| Bare Beppe AS | Hospitality | 2016 |
| Bare Drift AS | Hospitality | 2017 |
| Bare Solskinn AS | Hospitality | 2021 |
| Barebarokk Da | Arts & recreation | 2018 |
| Barklane AS | Wholesale & retail | 2025 |
| Barkåker T Eiendom AS | Real estate | 2013 |
| Barnas Have Avdeling Bugården AS | Education | 1992 |
| Barnas Have Avdeling Sentrum AS | Education | 2006 |
| Barnfind Technologies AS | Information & communication | 2012 |
| Base Media AS | Information & communication | 2019 |
| Baskin Grey AS | Construction | 2005 |
| Baskyte AS | Professional & scientific | 2021 |
| Bassili AS | Real estate | 2018 |
| Bassili Eiendom AS | Real estate | 2026 |
| Baumeister AS | Construction | 2020 |
| Baust AS | Administrative & support | 1994 |
| Bauta Regnskap AS | Professional & scientific | 2007 |
| Bavakt AS | Administrative & support | 2012 |
| Bayer Street Event AS | Administrative & support | 2021 |
| BB Oslofjord AS | Real estate | 2007 |
| BB Sandefjord AS | Real estate | 2010 |
| BD Solutions AS | Real estate | 2015 |
| Be Service Da | Administrative & support | 2022 |
| Be-St Padel AS | Arts & recreation | 2021 |
| Beck Asset Management AS | Manufacturing | 2006 |
| Beck Kjøkken & Interiør Studio AS | Wholesale & retail | 2021 |
| Beck Topco II AS | Manufacturing | 2024 |
| Bedre Bekken AS | Other services | 2026 |
| Bedre Inneklima AS | Wholesale & retail | 2006 |
| Beekay Invest AS | Professional & scientific | 2022 |
| Befo Eiendom AS | Real estate | 2000 |
| Beist Burger & Bar AS | Hospitality | 2017 |
| Bekk Og Bruse Kommunikasjon AS | Professional & scientific | 2019 |
| Bekke Eiendom AS | Real estate | 2005 |
| Bekke Holding AS | Wholesale & retail | 2005 |
| Bekkeveien 1 - 3 AS | Real estate | 1998 |
| Bekkeveien 7 AS | Real estate | 2016 |
| Bekkeveien 8 AS | Real estate | 2004 |
| Beliggenhet 1 AS | Real estate | 2024 |
| Belle Produksjoner AS | Information & communication | 2020 |
| Bena 777 Ihor Beilych Nuf | Other services | 2025 |
| Benders Norge AS | Wholesale & retail | 1986 |
| Bendik Norli Holding AS | | 2026 |
| Bengal Da | Wholesale & retail | 2023 |
| Benz Butikken AS | Wholesale & retail | 2018 |
| Benzini Campers AS | Administrative & support | 2021 |
| Bepe Invest AS | | 2012 |
| Bereist Travel AS | Administrative & support | 2026 |
| Berg & Longva Regnskap AS | Professional & scientific | 2025 |
| Berg Allum Consulting AS | Professional & scientific | 2009 |
| Berg Anlegg AS | Professional & scientific | 2020 |
| Berg Eiendom Og Forvaltning AS | Real estate | 1978 |
| Berg Industri AS | Real estate | 2012 |
| Bergan Mat AS | Wholesale & retail | 2015 |
| Berganmoen Eiendom AS | Real estate | 2012 |
| Berger Senteret AS | Real estate | 2006 |
| Bergmannsveien 323 AS | Real estate | 2013 |