| Bech Invest Alta AS | | 2020 |
| Bech Salong AS | Other services | 2017 |
| Bedre Boliger AS | Real estate | 1999 |
| Bedrift Nord AS | | 2019 |
| Bekkefaret 3 & 4 AS | Hospitality | 1999 |
| Beldo Helse AS | Health & social care | 2010 |
| Bellika Holding AS | | 2026 |
| Berg Industriservice AS | Manufacturing | 2023 |
| Berg Utvikling AS | Hospitality | 2006 |
| Berg VVS AS | Construction | 2021 |
| Bergum Gruppen AS | Real estate | 2010 |
| Betongveien 1 Alta AS | Real estate | 2018 |
| Betongveien 12 AS | Real estate | 2000 |
| Betongveien 19 AS | Real estate | 2018 |
| BGB Invest AS | Other services | 2019 |
| Bil & Last Teknikk AS | Other services | 2024 |
| Bilbyen Skadesenter Alta AS | Other services | 1998 |
| Bilistsenteret Alta AS | Wholesale & retail | 2012 |
| Bilpleiegarasjen AS | Other services | 2023 |
| Bilskadesenteret AS | Other services | 2002 |
| Birgitt S Johansen Limited Nuf | Wholesale & retail | 2008 |
| Birkeland-Bygg AS | Construction | 2024 |
| Biw Drift AS | Construction | 2013 |
| Biw Holding AS | Construction | 2013 |
| Bjarke Holding AS | | 2020 |
| BJB Vedlikehold AS | Construction | 2025 |
| Bjørkli Båt Og Bygg AS | Construction | 2024 |
| Bjørkmann Eiendom AS | Real estate | 1998 |
| Bjørkmanns AS | Professional & scientific | 1996 |
| Bjørn Even Hammari AS | Construction | 2020 |
| Bjørn Haugsnes Holding AS | Real estate | 2005 |
| Bjørn Mella Eiendom AS | Real estate | 2021 |
| Bjørn Og Steinar Johnsen Ans | Agriculture & fishing | 2015 |
| Bjørnar Bull AS | | 2022 |
| Bjørnfjell Mountain Lodge AS | Hospitality | 2016 |
| Bjørnæshuset AS | Real estate | 2014 |
| Bjøro Utvikling AS | Professional & scientific | 2012 |
| BKK Holding AS | | 2024 |
| Blend Salong AS | Other services | 2024 |
| Bless AS | | 2024 |
| Blikk Og Sveis AS | Construction | 2012 |
| Blikkenslager Bjørn Mella AS | Construction | 2020 |
| Blizzdesign AS | Professional & scientific | 2014 |
| Blomkvist Itk AS | Information & communication | 2014 |
| BM Johansen AS | Real estate | 2026 |
| Bmba Eiendom AS | Real estate | 2005 |
| Bmba Entreprenør AS | Construction | 1998 |
| Bmed AS | Information & communication | 2013 |
| Bmo Invest AS | Real estate | 2013 |
| BMP Holding AS | | 2021 |
| BMV Holding AS | | 2018 |
| Bo Drift AS | Hospitality | 2018 |
| Bo Eiendomsselskap AS | Real estate | 2022 |
| Bo Utleie AS | Real estate | 2022 |
| Bo Utvikling AS | Real estate | 2022 |
| Bobbo AS | Real estate | 1998 |
| Bohr Invest AS | | 2025 |
| Bolb AS | Information & communication | 2017 |
| Borchgrevinkhøyden Holding AS | Financial services | 2013 |
| Borras Holding AS | Real estate | 2019 |
| Bossekop Barnehage AS | Education | 2003 |
| Bossekop Eiendomselskap AS | Construction | 2012 |
| Bossekop Fysioterapi AS | Health & social care | 2017 |
| Bossekop Mat AS | Wholesale & retail | 2025 |
| Bot Holding AS | | 2022 |
| BP Capital AS | Hospitality | 2008 |
| BP Investering AS | | 2021 |
| BR Aslaksen AS | Construction | 2025 |
| BR Optikk Holding AS | Wholesale & retail | 2020 |
| Bra Bakst AS | Manufacturing | 2025 |
| Braavold Holding AS | | 2026 |
| Brask Invest AS | | 2019 |
| Bredal-Olsen Invest AS | Information & communication | 2005 |
| Breverud Barnehage AS | Education | 2011 |
| Breverud Holding AS | Real estate | 2013 |
| Bris Drift AS | Administrative & support | 2026 |
| Brodwall Øre Nese Hals AS | Health & social care | 2024 |
| Bronseveien 7 AS | Real estate | 2022 |
| Bronseveien 9 AS | Real estate | 2022 |
| Brth Holding AS | Construction | 2024 |
| Brødrene Ek AS | Wholesale & retail | 2015 |
| Brødrene Ek Eiendom AS | Real estate | 2015 |
| Brødrene Ek Holding AS | Wholesale & retail | 2015 |
| Brødrene Mathisens Sagbruk Og Trelasthandel AS | Wholesale & retail | 2021 |
| Brødrene Thomassen Ans | Construction | 1994 |
| Brødrene Thomassen AS | Construction | 2024 |
| Brøyte & Hyttehjelp AS | Administrative & support | 2020 |
| Bsuhr Invest AS | | 2026 |
| BT Engro AS | Wholesale & retail | 2024 |
| Bukta Lavpris AS | Wholesale & retail | 2000 |
| Bukta Næringspark AS | Real estate | 1989 |
| Bul Eiendom AS | Real estate | 2010 |
| Bygartner Utkilen AS | Administrative & support | 2026 |
| Bygg & Bolig Nord AS | Construction | 2019 |
| Bygg Pro AS | Construction | 2013 |
| Byggdrift Nord AS | Real estate | 2021 |
| Byggesøknad.No Da | Professional & scientific | 2010 |
| Bygginnredning Finnmark AS | Construction | 2018 |
| Byggmester Jan V Suhr AS | Construction | 2005 |
| Byggmester Nord AS | Construction | 2019 |