| Bedrifts - Rådgiveren Nuf | Professional & scientific | 2010 |
| Belibra Invest AS | Real estate | 2001 |
| Beno Invest AS | | 2025 |
| Benum AS | Transport & logistics | 2005 |
| Berg Elektronikkservice AS | Other services | 2004 |
| Bergersen Utleie AS | Real estate | 2021 |
| Bergli Eiendom AS | Real estate | 2025 |
| Bergli Montasje AS | Construction | 2015 |
| Bergli Montasje Øst AS | Construction | 2025 |
| Bergseng Holding AS | | 2026 |
| Bertinussen Og Sønn AS | Administrative & support | 2019 |
| Bilpleiespesialisten Sortland AS | Other services | 2010 |
| Bilskade Vesterålen AS | Other services | 2021 |
| Biltrend Eiendom AS | Real estate | 1995 |
| Biltrend Vesterålen AS | Other services | 2002 |
| Bilutleie Vesterålen Bil AS | Administrative & support | 2012 |
| Bjønskogen Samdrift Da | Agriculture & fishing | 2006 |
| Bjørlo Agrifokus AS | Professional & scientific | 2026 |
| Bjørn Ovik AS | Construction | 2008 |
| BK Larsen Eiendom AS | Manufacturing | 2005 |
| BKJ AS | Real estate | 2018 |
| BKJ Holding AS | | 2018 |
| Bl-Invest AS | Real estate | 2016 |
| Bladet Vesterålen AS | Information & communication | 1975 |
| Blikkenslager Erling Johnsen AS | Construction | 2009 |
| Bliversen AS | Information & communication | 2018 |
| Bliversen Eiendom AS | Real estate | 2018 |
| Blokken Båthavn SA | Real estate | 2019 |
| Blokken Skipsverft Eiendom AS | Real estate | 1953 |
| Blokknesset AS | Agriculture & fishing | 1992 |
| Blue Maritime Service Holding AS | Transport & logistics | 2016 |
| Blåbyen Byggservice AS | Construction | 2015 |
| Blåbyen Eiendomsinvest AS | Real estate | 2013 |
| Blåbyen Jakt Og Fiske AS | Wholesale & retail | 2010 |
| Blåbyløpet AS | Administrative & support | 2026 |
| Blåfjell Barnehage SA | Education | 2002 |
| Blåheimen Eiendom AS | Real estate | 2005 |
| Blåhuset Eiendom AS | Real estate | 2023 |
| Blånord AS | Professional & scientific | 2024 |
| Blåtann AS | | 2017 |
| BN Invest AS | Real estate | 2024 |
| Bna Invest AS | Financial services | 2018 |
| BR Eiendom AS | Real estate | 2024 |
| Bragejohan Holding AS | Administrative & support | 2025 |
| Brands of Norway AS | Wholesale & retail | 2006 |
| Bredbåndspartner AS | Information & communication | 2021 |
| BRG Bio AS | Manufacturing | 2023 |
| Bris Studio AS | Professional & scientific | 2012 |
| Brunborg Holding AS | Wholesale & retail | 2022 |
| Brødrene Jobsen AS | Construction | 1977 |
| Buildix AS | Construction | 2026 |
| Bulldozer Maskinlag Eiendom AS | Real estate | 1997 |
| Bulldozer Maskinlag Entreprenør AS | Construction | 1997 |
| Bulldozer Maskinlag Geopro AS | Professional & scientific | 2017 |
| Bulldozer Maskinlag Produksjon AS | Mining & quarrying | 1996 |
| Bulldozer Maskinlag Verksted AS | Administrative & support | 2005 |
| Buneset Invest AS | | 2026 |
| Byfrisør'N Vesterålen AS | Other services | 2007 |
| Bygg Plan Ltd Nuf | Manufacturing | 2010 |
| Byggmester Odd Arild Pettersen AS | Construction | 2015 |
| Byggmester Ole-Bjørn Lien AS | Construction | 2014 |
| Bø Gårdsslakteri AS | Manufacturing | 2018 |
| Børres AS | Wholesale & retail | 2019 |
| Børøya Industribygg AS | Real estate | 2021 |
| Børøyveien 16 AS | Real estate | 2021 |
| C. J. Bygg AS | Construction | 2022 |
| C. Jensen Holding AS | Construction | 2020 |
| Camilla Robertsen Holding AS | | 2023 |
| Cee Eiendom AS | Real estate | 2020 |
| Celinn Kystfisk AS | Agriculture & fishing | 2014 |
| CF Capital AS | | 2025 |
| Chriship AS | Transport & logistics | 1973 |
| Chriship Offshore AS | Transport & logistics | 2007 |
| Chriship-Gruppen AS | Transport & logistics | 2005 |
| CLEAN24 AS | Other services | 2025 |
| Clio Eiendom AS | Real estate | 2020 |
| Cnord Invest AS | | 2020 |
| Coadvance AS | Information & communication | 2024 |
| Confura AS | Professional & scientific | 2014 |
| Corner Sport Blåbyen AS | Wholesale & retail | 2020 |
| Corvina AS | Professional & scientific | 2021 |
| Custom Shop AS | Wholesale & retail | 2020 |
| D1 Sortland AS | Hospitality | 2017 |
| Daniel Larsen Johansen AS | Wholesale & retail | 2019 |
| Datanor AS | Wholesale & retail | 1985 |
| DDJ Eiendom AS | Real estate | 2000 |
| Deadline Event AS | Arts & recreation | 2015 |
| Deadline Holding AS | Information & communication | 2016 |
| Deadline Media & Film AS | Information & communication | 2017 |
| Den Blå Tråd AS | Wholesale & retail | 2014 |
| Den Misunnelige Frisør AS | Other services | 2017 |
| Dental Invest AS | Manufacturing | 2023 |
| Dho AS | Wholesale & retail | 2018 |
| Dho Eiendom AS | Real estate | 2015 |
| Dho Krypinn AS | Real estate | 2016 |
| Dho Næringseiendom AS | Real estate | 2025 |
| Diligent Invest AS | | 2025 |
| Dirk Schmidt | Construction | 2009 |
| Doctor Drywall AS | Construction | 2021 |
| Dog Planet AS | Information & communication | 2025 |