| Be Heitmann AS | Real estate | 2022 |
| Bearly Capital AS | | 2022 |
| Beat Coats Ans | Arts & recreation | 1991 |
| Beauty by Doris AS | Other services | 2022 |
| Beautybyada AS | Other services | 2025 |
| Beca AS | Wholesale & retail | 2005 |
| Bedriftssystemer AS | Wholesale & retail | 2003 |
| Bedriftsutvikling AS | Professional & scientific | 1999 |
| Bedsys AS | Wholesale & retail | 2005 |
| Bedsys Eiendom AS | Real estate | 2010 |
| Bedøko AS | Professional & scientific | 2012 |
| Belada AS | Transport & logistics | 2021 |
| Belvika Resort & Adventures AS | | 2016 |
| Bem Holding AS | | 2025 |
| Bemanning Nord-Norge AS | Administrative & support | 2023 |
| Bemanningskontoret AS | Administrative & support | 2012 |
| Bengt Gøran AS | Transport & logistics | 2018 |
| Bengt Gøran Holding AS | | 2023 |
| Benoni & Rosa Frisør AS | Other services | 1993 |
| Benzin AS | Information & communication | 2016 |
| Berg & Berg Ans | Education | 1998 |
| Berg Betong AS | Manufacturing | 2009 |
| Berg Eiendom AS | Real estate | 1998 |
| Berg Eiendomsutvikling AS | Real estate | 1998 |
| Berg Holding AS | Professional & scientific | 1992 |
| Berg Horizon AS | | 2025 |
| Berg Partner Eiendom AS | Real estate | 2016 |
| Berg Partner Havbruk AS | Transport & logistics | 2016 |
| Bergethon AS | Real estate | 1997 |
| Bergli Utvikling AS | Real estate | 2010 |
| Bergmo AS | Agriculture & fishing | 2020 |
| Berit Norbakken AS | Arts & recreation | 2016 |
| Bermar Holding AS | | 2023 |
| Berner Consult AS | Real estate | 2005 |
| Berner Invest AS | Financial services | 1987 |
| Berners AS | Real estate | 2021 |
| Berners Sønn AS | Real estate | 2006 |
| Bernhof Hansen Eiendomstaksering AS | Real estate | 1993 |
| Best Arctic AS | Administrative & support | 2012 |
| Best Arctic Group AS | Administrative & support | 2019 |
| Best Arctic Holding AS | Transport & logistics | 2021 |
| Best Ekspress Langnes AS | Wholesale & retail | 2015 |
| Best Nord AS | Hospitality | 2023 |
| Beu Bjerkaker AS | Real estate | 2023 |
| Bevegende Vev AS | Arts & recreation | 2024 |
| Bewe Eiendom AS | Real estate | 2025 |
| Beyond Cinematic AS | Information & communication | 2015 |
| BFN Da | Arts & recreation | 2019 |
| Bhe Invest AS | Financial services | 2005 |
| Bikeriet AS | Wholesale & retail | 2019 |
| Bilbyen Skadesenter AS | Other services | 2012 |
| Bilbørsen Tromsø Bilutleie AS | Administrative & support | 2018 |
| Billakkspesialisten Tromsø AS | Wholesale & retail | 1998 |
| BILMESTER1 AS | Other services | 2023 |
| BILMESTER1 Mor AS | Other services | 2023 |
| Bilpleiesenteret Tromsø AS | Other services | 2016 |
| Bilskadesenteret Tromsø AS | Other services | 2010 |
| Biltrend Kafè AS | Hospitality | 2009 |
| Biltrend Langnes AS | Wholesale & retail | 1996 |
| Bilzone AS | Administrative & support | 2022 |
| Binero Tromsø AS | Information & communication | 2024 |
| Binero Tromsø Datter AS | | 2026 |
| Bingodrift Tromsø AS | Arts & recreation | 2011 |
| Biofasit AS | Professional & scientific | 2013 |
| Biotec Betaglucans AS | Manufacturing | 2010 |
| Birgittes Hjem AS | Wholesale & retail | 2009 |
| Biti Holding AS | Professional & scientific | 2017 |
| Bjarne Holding AS | | 2020 |
| Bjerkaker Barnehage SA | Education | 1976 |
| Bjerkaker Båthavn SA | Transport & logistics | 2004 |
| Bjerkaker Maskin AS | Construction | 2026 |
| Bjerkaker Sjøpark AS | Real estate | 2015 |
| Bjerkakerbukta AS | Real estate | 2023 |
| Bjerkakerfjæra AS | Real estate | 2011 |
| Bjerkakerhallen AS | Arts & recreation | 2016 |
| Bjerkan Invest AS | | 2023 |
| Bjordal AS | Health & social care | 2022 |
| Bjørk-Invest AS | | 2018 |
| Bjørka Holding AS | Real estate | 2019 |
| Bjørkly Invest AS | | 2025 |
| Bjørn Eiendom AS | Real estate | 1971 |
| Bjørn-Gruppen AS | Real estate | 1986 |
| Bjørnafjorden Boligutvikling AS | Real estate | 2022 |
| Bjørnebekken Grendehus SA | Real estate | 1982 |
| Bjørnflaten Utvikling AS | Professional & scientific | 2015 |
| BK Byggentreprise AS | Construction | 2004 |
| BK13 Næring AS | Real estate | 2023 |
| Bkbg AS | | 2021 |
| BKW Service AS | Construction | 2022 |
| Black Panther Holding AS | | 2021 |
| Bladet Nordlys AS | Information & communication | 1982 |
| Blg-Utleie AS | Administrative & support | 2019 |
| Blickenslager Da | Information & communication | 2012 |
| Blik Holding AS | | 2023 |
| Blikkenslager Tom Dreyer AS | Construction | 2008 |
| Bloomed AS | Health & social care | 2018 |
| Blå Horisont Invest AS | | 2023 |
| Blå Rock Cafe AS | Hospitality | 1996 |
| Blå Rock Eiendom AS | Real estate | 1989 |
| Blåmann Eiendom AS | Real estate | 2005 |