| Boba Cha Ski AS | Hospitality | 2023 |
| Bobstr AS | | 2020 |
| Bodycare AS | Health & social care | 2017 |
| Bogruppen Da | Administrative & support | 2004 |
| Bokerød Gruppen AS | Wholesale & retail | 2003 |
| Boligtech AS | Construction | 2017 |
| Bomax AS | Real estate | 1998 |
| Bonanza Media AS | Administrative & support | 2010 |
| Bones Invest AS | | 2015 |
| Bonobos AS | Professional & scientific | 2017 |
| Bor Arkitekter AS | Professional & scientific | 2019 |
| Boxstyle Norway AS | Real estate | 2024 |
| Braathen Og Westhagen Ans | Wholesale & retail | 1996 |
| Brantenborg Sameie Ans | Real estate | 2004 |
| Bratlie Maskinservice AS | Manufacturing | 2021 |
| Bravoaktiv AS | Information & communication | 2023 |
| Brenden Sjakk AS | Education | 2025 |
| Brisco Ans | | 1990 |
| Broadcast Solutions Nordic AS | Wholesale & retail | 2023 |
| Brokk Norge AS | Wholesale & retail | 2011 |
| Bruktbilmegling AS | Wholesale & retail | 2012 |
| Brunata Norge AS | Wholesale & retail | 2019 |
| Brunvoll Venture AS | | 2025 |
| Brødr Johnsen Saleimpex AS | Wholesale & retail | 1965 |
| Brødrene Aaberg Mek Verksted AS | Manufacturing | 1974 |
| Brødrene Fredlund AS | Education | 2001 |
| Brødrene Grønvold AS | | 2025 |
| Brødrene Grønvold R31 AS | Real estate | 2023 |
| Brøvig Company AS | Real estate | 2002 |
| BS Auto AS | Wholesale & retail | 2023 |
| Budalen Holding AS | | 2022 |
| Buddy Service Ans | Transport & logistics | 2007 |
| Bui Impact AS | Professional & scientific | 2026 |
| Buldre AS | Real estate | 2011 |
| Burøe AS | Arts & recreation | 2020 |
| Bussanlegg Ski AS | Real estate | 2023 |
| Butikkdrift Obeka AS | Wholesale & retail | 2022 |
| Bx-Drift AS | Wholesale & retail | 2009 |
| Bygg & Prosjektledelse AS | Professional & scientific | 2026 |
| Bygg Og Boligvare AS | Wholesale & retail | 2019 |
| Bygg Og Konsulentservice AS | Professional & scientific | 1977 |
| Byggamitthem AS | Professional & scientific | 2015 |
| Byggmester Evensen AS | Construction | 2005 |
| Byggmester Richard Fosser Minge AS | Construction | 2017 |
| Byggmesterforsikring AS | Financial services | 2003 |
| Byggmesterforsikring Eiendom AS | Real estate | 2021 |
| Byggservice Ski AS | Construction | 2023 |
| Bymico AS | Professional & scientific | 2023 |
| Bytjenester AS | Transport & logistics | 2019 |
| Bøleråsen Senter AS | Real estate | 1991 |
| Bøndenes Hus Ski SA | Real estate | 1960 |
| Bøvelstad Holding AS | Professional & scientific | 2005 |
| C. Lund Holding AS | Manufacturing | 2018 |
| Cabba Eiendom AS | Real estate | 2026 |
| Caddie AS | Wholesale & retail | 2020 |
| Cageball Ski AS | | 2026 |
| Caledonian Minerals AS | Mining & quarrying | 2021 |
| Calmseas AS | Transport & logistics | 2015 |
| Camerata Laranjeiras AS | Arts & recreation | 2019 |
| Camozzi Automation AS | Wholesale & retail | 2014 |
| Candleweb AS | Information & communication | 1995 |
| Capella Minerals Norway AS | Mining & quarrying | 2019 |
| Capenda AS | Professional & scientific | 2020 |
| Capsicum AS | Wholesale & retail | 2005 |
| Car Senter AS | Wholesale & retail | 2025 |
| Cardcenter Holding AS | | 2025 |
| Cargotron AS | Transport & logistics | 2009 |
| Cashba Capital Management AS | Real estate | 2018 |
| Cashinnor AS | Real estate | 2021 |
| Catch Eiendom Holding AS | | 2021 |
| Cato Jensen Invest AS | | 2021 |
| Cattor Holding AS | Other services | 2015 |
| CC Billing AS | Information & communication | 2022 |
| CC Partner Follo AS | Manufacturing | 2008 |
| Cecar AS | Other services | 1992 |
| Cecar Holding AS | Other services | 2005 |
| Cecilie Augestad Holding AS | Health & social care | 2023 |
| Cema Invest AS | Information & communication | 2012 |
| Centrum Fysioterapi Ski Da | Health & social care | 2013 |
| Cfa Eiendom AS | | 2023 |
| Chamalo AS | | 1996 |
| Chrola Holding AS | Professional & scientific | 2019 |
| Circo AS | Financial services | 2018 |
| Cirkle a AS | Wholesale & retail | 2017 |
| Citorus AS | Professional & scientific | 1999 |
| City Skippergt 14 AS | Real estate | 2020 |
| Clarius AS | Wholesale & retail | 2015 |
| Clay Studio AS | Arts & recreation | 2026 |
| Clickwalk AS | Information & communication | 1998 |
| Cma Venture AS | Information & communication | 2002 |
| Collection Norge AS | Wholesale & retail | 2014 |
| Collectiveai AS | Information & communication | 2023 |
| Companys Ski AS | Wholesale & retail | 2015 |
| Computare AS | Professional & scientific | 2024 |
| Computers and Learning AS | Information & communication | 1988 |
| Condense AS | Information & communication | 2023 |
| Condense Holding AS | | 2023 |
| Confettibird AS | Wholesale & retail | 2017 |
| Consept Holding AS | Real estate | 2006 |
| Continova AB Nuf | Other services | 2020 |