| Berkåk Eiendom AS | Real estate | 2021 |
| Berset Eiendom AS | Real estate | 2008 |
| Berset Holding AS | Real estate | 2008 |
| Bess AS | Administrative & support | 1990 |
| Best Service AS | Administrative & support | 2022 |
| Best Service Eiendom AS | Real estate | 2022 |
| Bestoda AS | Professional & scientific | 2016 |
| Betong Tech AS | Construction | 2011 |
| Betonghus Ans | Construction | 2001 |
| Betongsaging Møre AS | Construction | 2006 |
| BFH Datter AS | Transport & logistics | 2025 |
| BFK Eiendom AS | Real estate | 2005 |
| BFK Holding AS | Professional & scientific | 2005 |
| BFL Invest AS | Real estate | 2012 |
| BG Consulting AS | Professional & scientific | 2013 |
| BGN Invest AS | Real estate | 2006 |
| Bidnest AS | Professional & scientific | 2025 |
| Bifrost Maskin & Kuldeteknikk AS | Professional & scientific | 2022 |
| Bildeler Ålesund AS | Wholesale & retail | 2020 |
| Bilfergen AS | Real estate | 2014 |
| Bilklassikeren AS | Wholesale & retail | 2021 |
| Bilpunktet AS | Wholesale & retail | 2021 |
| Bima Eiendom AS | Real estate | 1990 |
| Bimah Invest AS | | 2022 |
| Binderiet Ålesund AS | Wholesale & retail | 2017 |
| Bingsa Eiendom AS | Real estate | 2021 |
| Bingsa Miljøpark AS | Real estate | 2020 |
| Bingsa Miljøpark Holding AS | Real estate | 2020 |
| Bingsa Tomt 34/430 AS | | 2026 |
| Biopractor Norway AS | Health & social care | 2012 |
| Biorest AS | Mining & quarrying | 2018 |
| Birdie Lounge AS | Administrative & support | 2024 |
| Birger Hatlebakks Veg 17 AS | Real estate | 2004 |
| Birkeland Taksering AS | Real estate | 1999 |
| Birkevold AS Huset Vårt | Wholesale & retail | 1911 |
| Birkevold Holding AS | Real estate | 2007 |
| Birkr AS | Wholesale & retail | 2007 |
| Birting AS | Professional & scientific | 2012 |
| Bita Invest AS | Professional & scientific | 2017 |
| Biver AS | Financial services | 2005 |
| Bizon AS | Information & communication | 1994 |
| BJN Holding AS | Professional & scientific | 2005 |
| Bjorli Eiendom AS | Real estate | 2000 |
| Bjorli Eiendommer AS | Real estate | 2016 |
| Bjorli Låve AS | Real estate | 1997 |
| Bjotun Holding AS | | 2023 |
| Bjugn Eiendom AS | Real estate | 2008 |
| Bjørkavollen Eiendom AS | Real estate | 2011 |
| Bjørkavågen Eiendom AS | Real estate | 2015 |
| Bjørlo Handel AS | Wholesale & retail | 2020 |
| Bjørn Hole AS | Health & social care | 2012 |
| Bjørn Sunde AS | Financial services | 2005 |
| Bjørndalvegen 3A AS | Real estate | 2025 |
| Bjørnholmen Invest AS | Financial services | 2013 |
| Bkom AS | Professional & scientific | 2023 |
| BL4SEA AS | Professional & scientific | 2016 |
| Blendverk AS | Information & communication | 2023 |
| Blikkenslageren AS | Construction | 1989 |
| Blikkenslagermester Even Helgesen AS | Construction | 1998 |
| Blindheim Eiendom AS | Real estate | 1986 |
| Blindheim Fysikalske Institutt AS | Health & social care | 2017 |
| Blindheim Holding AS | | 2010 |
| Blindheim Invest AS | Real estate | 2001 |
| Blindheim Legesenter AS | Health & social care | 2001 |
| Blindheim Maskin & Transport AS | Construction | 1997 |
| Blindheim Maskin AS | Construction | 2021 |
| Blindheim Mat AS | Wholesale & retail | 2000 |
| Blindheim Miljø AS | | 2025 |
| Blindheim Tannlegesenter AS | Health & social care | 2016 |
| Blindheim Utleie Og Service AS | Administrative & support | 2021 |
| Blindheimsbreivika AS | Real estate | 2006 |
| Blink Trafikkskole Ålesund AS | Education | 2021 |
| Blombo Invest AS | | 2024 |
| Blommenholm Invest AS | Financial services | 2008 |
| Blomster Gården AS | Wholesale & retail | 2010 |
| Blomsterhuset Moa AS | Wholesale & retail | 1995 |
| Blomsterstua Ålesund AS | Wholesale & retail | 2011 |
| Blue Balance AS | Professional & scientific | 2023 |
| Blue Ctrl AS | Information & communication | 2010 |
| Blue Dot AS | Professional & scientific | 2017 |
| Blue Resource Group AS | Real estate | 2015 |
| Blue Software AS | Information & communication | 2018 |
| Bluewild AS | Agriculture & fishing | 2018 |
| Bluewild Ocean I AS | Agriculture & fishing | 2017 |
| Bluewild Ocean II AS | Agriculture & fishing | 2017 |
| Bluewild Seafood AS | Wholesale & retail | 2002 |
| Bluss Forlag AS | Information & communication | 2025 |
| Blånibba Invest AS | | 2019 |
| Blåsmo Eiendom AS | Real estate | 2016 |
| BM Pluss AS | Administrative & support | 2026 |
| Bmam Holding AS | | 2021 |
| BMM Holding AS | Construction | 1993 |
| Bms-Holding AS | | 2025 |
| BNP Paribas Leasing Solutions AS | Financial services | 2007 |
| Boatlabs Pro AS | Professional & scientific | 2025 |
| Bodil Laverton AS | | 2018 |
| Bogland AS | | 2025 |
| Bohica AS | Administrative & support | 2018 |
| Boho-Chic AS | Wholesale & retail | 2012 |
| Bok-Holding AS | Financial services | 2008 |