| Breidablik Eiendom AS | | 2017 |
| Breidablikgaten 97 AS | Real estate | 2006 |
| Breidablikktun Eiendom AS | Real estate | 2002 |
| Breidablikktun Invest AS | Real estate | 2018 |
| Bris Media AS | Information & communication | 2016 |
| Brisi Da | Real estate | 2016 |
| Bro Eiendominvest AS | Real estate | 2025 |
| Brukt & Antik Stord AS | Wholesale & retail | 2016 |
| Bruktbilsalg AS | Wholesale & retail | 2024 |
| Brum Holding AS | Real estate | 2005 |
| Brun'O Interiør AS | Wholesale & retail | 2012 |
| Brushes.No AS | Manufacturing | 2026 |
| Bruvik Time AS | Wholesale & retail | 2009 |
| Bryggesoft AS | Information & communication | 2020 |
| Bryggesoft Holding AS | Information & communication | 2020 |
| Bråstein & Stelander AS | Construction | 2005 |
| Bråstein Invest AS | Transport & logistics | 2008 |
| Brødr Jacobsen Handel AS | Wholesale & retail | 1990 |
| Brødrene Klovning Offshore AS | Transport & logistics | 1996 |
| Brødrene Klovning Shipping AS | Transport & logistics | 1997 |
| Brødrene Klovnings Rederi AS | Transport & logistics | 1993 |
| BS Capital Management AS | | 2020 |
| Bsev Invest AS | Real estate | 2022 |
| BT - Rør AS | Construction | 2007 |
| BT Holding AS | Transport & logistics | 2016 |
| BTB Holdco AS | | 2026 |
| BTH Restaurantdrift AS | Hospitality | 2018 |
| Buddy Raglamyr AS | Wholesale & retail | 2011 |
| Bugn AS | Information & communication | 2023 |
| Bugsertjeneste AS | Transport & logistics | 2014 |
| Bugsertjeneste IV AS | Administrative & support | 1998 |
| Bugsertjeneste V AS | Administrative & support | 2026 |
| Buhl Holding AS | Education | 2022 |
| Bukkevik Investering AS | Agriculture & fishing | 2005 |
| Bunad & Dåpsdesign AS | Manufacturing | 2018 |
| Bunadsmesteren AS | Manufacturing | 2023 |
| Bunadsperla AS | Wholesale & retail | 2016 |
| Bunadtilvirkeren Aho AS | Wholesale & retail | 2023 |
| Burger Gard AS | Hospitality | 2026 |
| Butikk 440 Markedet Gudmund Grinde AS | Transport & logistics | 2002 |
| Bve AS | Professional & scientific | 2006 |
| By & Bo AS | Construction | 2013 |
| Byelektrikeren AS | Construction | 2018 |
| Bygg Og Eiendomstjenester AS | Construction | 2016 |
| Bygg Og Industrigross Norge AS | Wholesale & retail | 2007 |
| Bygg- Og Transportservice Ans | Transport & logistics | 1997 |
| Byggdetalj AS | Construction | 2006 |
| Byggfirma Kjellesvik & Severinsen AS | Construction | 2004 |
| Byggmester Aasbøe AS | Construction | 2012 |
| Byggmester Dominguez AS | Construction | 2022 |
| Byggmester ND AS | Construction | 2025 |
| Byggmester Per Thorsen AS | Construction | 2025 |
| Byggmester Sven Ivar Solstrand AS | Construction | 2016 |
| Byggmesterfirma Arne Hallquist AS | Construction | 2007 |
| Byggmesterfirma Olsen & Nilsen AS | Construction | 2021 |
| Byscenen Haugesund AS | Arts & recreation | 2023 |
| Bytunet Restaurant Drift AS | Hospitality | 2000 |
| Bytunetnattklubb AS | Hospitality | 2018 |
| Brum Eiendom A/S | Real estate | 1988 |
| Bøe Anleggstjenester AS | Construction | 2022 |
| Bøe Holding AS | Construction | 2022 |
| Bøkker Eiendom AS | Real estate | 2013 |
| Bømmeløy AS | Transport & logistics | 2008 |
| Bømmeløy Invest AS | Real estate | 2003 |
| Bømmeløy Shipping AS | Transport & logistics | 2025 |
| Bøneset Elektro AS | Construction | 2013 |
| Børge Holding AS | Wholesale & retail | 2007 |
| Børseth Rådgivning AS | Professional & scientific | 2010 |
| Bøviks Holding AS | Real estate | 2012 |
| Bøviks Transport AS | Transport & logistics | 2012 |
| C Knutsen AS | | 2022 |
| Cabral AS | Mining & quarrying | 2022 |
| Cad Invest AS | Real estate | 2005 |
| Cael Invest AS | | 2016 |
| Caha Investering AS | | 2005 |
| Caiano AS | Transport & logistics | 2008 |
| Caiano Bømlo AS | Real estate | 2025 |
| Caiano Eiendom AS | Real estate | 1956 |
| Caiano Hotelldrift AS | Hospitality | 1987 |
| Caiano Hotels AS | Hospitality | 2023 |
| Caiano Invest AS | Transport & logistics | 1998 |
| Caiano Italia AS | Real estate | 2007 |
| Caiano Management AS | Transport & logistics | 1998 |
| Caiano Maritime AS | Transport & logistics | 2023 |
| Caiano Regnskap AS | Professional & scientific | 2012 |
| Caiano Restaurantdrift AS | Hospitality | 2024 |
| Caiano Ship AS | Administrative & support | 1997 |
| Caiano Shipping AS | Administrative & support | 2011 |
| Caiano Terminals AS | Transport & logistics | 1998 |
| Caimax AS | Real estate | 2019 |
| Cala AS | Real estate | 2023 |
| Calanus Oil AS | Professional & scientific | 2013 |
| Callami Invest AS | Information & communication | 2016 |
| Calmero AS | Professional & scientific | 2015 |
| Capalos Holding AS | Real estate | 2013 |
| Captains AS | Hospitality | 1968 |
| CARBON14 AS | Professional & scientific | 2007 |
| Carl J Amundsen AS | | 1986 |
| Carlos Kaffe AS | Hospitality | 2014 |
| Carpatia Strategy AS | Professional & scientific | 2026 |