| Atlanterhavsklinikken AS | Health & social care | 2018 |
| Atlantic AS | Real estate | 2021 |
| Atlantic Blaana AS | Transport & logistics | 2015 |
| Atlantic Bunkers AS | Wholesale & retail | 2015 |
| Atlantic Group Holding AS | Real estate | 2017 |
| Atlantic Region SA | Information & communication | 2025 |
| Atlantic Sea Cargo AS | Transport & logistics | 2020 |
| Atlantic Solutions AS | Administrative & support | 2026 |
| Atlantic-Eiendom AS | Real estate | 2021 |
| Atlas Shipbrokers AS | Transport & logistics | 2019 |
| Audal AS | Wholesale & retail | 1992 |
| Aunetunet Omsorg AS | Real estate | 2026 |
| Aura Medisinske AS | Health & social care | 2024 |
| Aurora Borealis Maritime Service AS | Professional & scientific | 2016 |
| Autility AS | Information & communication | 2019 |
| Autoservice AS | Other services | 2003 |
| Averøy Gruppen AS | Real estate | 2010 |
| Avtalebanken Da | Information & communication | 2010 |
| Awo Consulting AS | Real estate | 2013 |
| Azteco AS | Hospitality | 2024 |
| B & B Endresen Holding AS | | 2018 |
| B I Neergaard Invest AS | | 2017 |
| B Management AS | Administrative & support | 2019 |
| B Solem AS | Financial services | 2018 |
| B. Myrseth Holding AS | Financial services | 2018 |
| B. Reitan & Sønn AS | Construction | 2012 |
| Backer Eiendom AS | Real estate | 1992 |
| Backers Rederi AS | Real estate | 1935 |
| Baco Industrier AS | Manufacturing | 1989 |
| Bakkaly Holding AS | | 2025 |
| Balder Lyd Invest AS | | 2023 |
| Bangsund Eiendommer AS | Real estate | 2010 |
| Barbara Holding AS | | 2025 |
| BB Futura AS | Hospitality | 2024 |
| BC Vedlikehold AS | Manufacturing | 2013 |
| Beate Hansen Holding AS | | 2020 |
| Bedriftsveien 2 AS | Construction | 2007 |
| Bedriftsveien 4 AS | Real estate | 1986 |
| Bedriftsveien 7C AS | Real estate | 2010 |
| Bellis Blomster Ans Hals Og Sæther | Wholesale & retail | 1990 |
| Beluga Kristiansund AS | Other services | 2012 |
| Benor AS | Professional & scientific | 1998 |
| Bentneset Invest AS | Real estate | 2003 |
| Berge Motor AS | Wholesale & retail | 1986 |
| Berntzen Equity AS | | 2020 |
| Bestla AS | Construction | 2013 |
| Bid Atlanten AS | Hospitality | 2017 |
| Big-Wheels AS | Wholesale & retail | 2009 |
| Bilfag Nordmøre Og Romsdal SA | Education | 1995 |
| Birgers AS | Hospitality | 2020 |
| Bjørg Lystad Holding AS | Real estate | 2013 |
| Bjørnemosen AS | | 2014 |
| Bjørns Service AS | Administrative & support | 2014 |
| Blaa Reklame AS | Professional & scientific | 1994 |
| Blinken Eiendom AS | Real estate | 2015 |
| Blinken Invest AS | Real estate | 2002 |
| Blue Cosmetics AS | Wholesale & retail | 2012 |
| Blueevents.No AS | Administrative & support | 2015 |
| Bluewave Ventures AS | | 2024 |
| BLW AS | | 2021 |
| BM Agenturer AS | Wholesale & retail | 2024 |
| Bogestilla AS | Professional & scientific | 1983 |
| Boi Averøy AS | Real estate | 2010 |
| Boi Bolig AS | Real estate | 2010 |
| Boi Molde AS | Real estate | 2010 |
| Bolgstrand AS | | 2020 |
| Bolighuset Invest Holding AS | Real estate | 2019 |
| Boligpakken AS | Real estate | 2019 |
| Boligpartner Holding AS | Real estate | 2003 |
| Boteco AS | Hospitality | 2013 |
| Boteco Interiør AS | Wholesale & retail | 2020 |
| BR Sund AS | Real estate | 2020 |
| Braatthallen AS | Arts & recreation | 1993 |
| Brandstad Eiendom AS | Transport & logistics | 1997 |
| Bransjesenteret AS | Real estate | 2020 |
| Bras Invest AS | Real estate | 2005 |
| Brekstad Holding AS | | 2020 |
| Bremnes Eiendom Invest AS | Construction | 2011 |
| Brevik & Lysø AS | | 2025 |
| Brottsjø AS | Administrative & support | 2008 |
| Brottsjø II AS | Real estate | 2015 |
| Brunsviken Eiendom AS | Real estate | 1964 |
| Brunsvikens Reperbane AS | Financial services | 2001 |
| Bryggekanten Brasserie & Bache Bar AS | Hospitality | 2006 |
| Brændeland Holding AS | Real estate | 2020 |
| BS1 Eiendom AS | Real estate | 2019 |
| BS3 Eiendom AS | Real estate | 2022 |
| Bukkeråket 19 AS | | 2023 |
| Bulldetektor AS | | 2021 |
| Bunnpris Stortua AS | Wholesale & retail | 1992 |
| Burger Boost AS | Hospitality | 2013 |
| Busken AS | Administrative & support | 2013 |
| Buskerud Eiendomsmegling AS | Real estate | 2019 |
| BV Service AS | Wholesale & retail | 2016 |
| Bygg Alt AS | Construction | 2025 |
| Bygg Partner Eiendom AS | Real estate | 2017 |
| Bygg Partner Kristiansund AS | Construction | 2001 |
| Byggefirma Hasselø & Kvisvik AS | Construction | 2006 |
| Byggeria AS | Construction | 2022 |
| Byggeria Prosjekt AS | Construction | 2026 |