| Bissmiet AS | Real estate | 2009 |
| Bjerkan Eiendomsutvikling AS | Real estate | 2024 |
| Bjoko Holding AS | Administrative & support | 2020 |
| Bjullu Holding AS | | 2025 |
| Bjørka Eiendom AS | Real estate | 2015 |
| Bjørn Are Hansen Trsp AS | Transport & logistics | 1999 |
| Bjørnstu VVS AS | Construction | 2002 |
| Bjørumsbrekka Holding AS | | 2025 |
| Black & White Nye AS | Wholesale & retail | 2018 |
| Blikkenslager Kierulf AS | Construction | 2011 |
| Blomlie Arntsen AS | | 2024 |
| Blåhø Eiendom AS | Real estate | 2019 |
| BN Entreprenør AS | Construction | 2003 |
| BN Entreprenør Holding AS | Construction | 2022 |
| BNB Bygg AS | Construction | 2021 |
| Bne Heggstadmoen 2 AS | Real estate | 2025 |
| Bobank AS | Information & communication | 2008 |
| Bobilkjeden Norge AS | Wholesale & retail | 2022 |
| Boligprosjekter AS | Real estate | 2017 |
| Bonsaksen Consulting AS | Information & communication | 2019 |
| Borgen Karriere AS | Administrative & support | 2021 |
| Borten Moe Holding AS | Construction | 2014 |
| Braathen Technologies AS | | 2025 |
| Brastadlund Holding AS | | 2026 |
| Bratberg-Holding AS | Wholesale & retail | 2023 |
| Brattørgata 8 AS | Real estate | 2018 |
| Brekketrøa Boliger AS | Real estate | 2019 |
| Broholm Styling AS | Professional & scientific | 2025 |
| Bryggeribyen Ec Dahls AS | Real estate | 2017 |
| Brødrene Hes Restaurantdrift Ans | | 1993 |
| Brødrene Nielsen Eiendom AS | Real estate | 2014 |
| Brønnøy Eiendom AS | Real estate | 2022 |
| Brøset Nord Felt 2 AS | Real estate | 2024 |
| Buamee AS | Hospitality | 2022 |
| Buffalo Road Safety AS | Manufacturing | 2013 |
| Bulletins AS | Information & communication | 2025 |
| Bunnpris Heimdal AS | Wholesale & retail | 1985 |
| Bunnpris Sandmoen AS | Wholesale & retail | 1996 |
| Burbængs AS | | 2026 |
| Busklein Paintball Da | Administrative & support | 2015 |
| Bygg Og Landskapspleie AS | Administrative & support | 2005 |
| Byggmester Bugge AS | Construction | 2003 |
| Byggmester Børke AS | Construction | 2022 |
| Byggmester Geir O Furunes AS | Construction | 1991 |
| Byggmester Og Takstmann Fredrik Utaker AS | Construction | 2012 |
| Byggmester Tore Johansen AS | Construction | 2013 |
| Byggpartner Trondheim AS | Construction | 2014 |
| Bylottevikan AS | Other services | 2026 |
| Byst Invest AS | Real estate | 2024 |
| Byåsen Trevare AS | Construction | 1991 |
| Båstadgruppen Norge AS | Wholesale & retail | 2002 |
| Båt Og Bobiltjenester AS | Transport & logistics | 2018 |
| C.H Bygg Og VVS AS | Construction | 2022 |
| Ca-Holding AS | Professional & scientific | 2022 |
| Cadio AS | Manufacturing | 2011 |
| Caligo AS | | 2009 |
| Calypso Invest AS | Financial services | 2006 |
| Capinor Invest AS | | 2022 |
| Carbofex Scandinavia AS | Wholesale & retail | 2025 |
| Castro AS | Professional & scientific | 2012 |
| Centena Drift AS | Arts & recreation | 2025 |
| Chairman AS | Professional & scientific | 2012 |
| CHC Holding AS | Real estate | 2020 |
| Chruicshank-Gården AS | Real estate | 2023 |
| Chruicshank-Gården Holding AS | | 2023 |
| City Radio & Tv-Service AS | Other services | 1998 |
| Clean Cut AS | Other services | 2020 |
| CLS Birøkt AS | Agriculture & fishing | 2026 |
| CLS Holding AS | Real estate | 2011 |
| CO2 Purification AS | Professional & scientific | 2007 |
| Constance AS | Professional & scientific | 2008 |
| Constance R W Torjussen Holding AS | | 2025 |
| Contiki Holding AS | Information & communication | 2021 |
| Cor Holding AS | Financial services | 2018 |
| CR Transport AS | Transport & logistics | 2021 |
| Daniel Holck AS | | 2017 |
| Dansegalla Limited Nuf | Arts & recreation | 2011 |
| Dartbutikken AS | Wholesale & retail | 2023 |
| Datec AS | Information & communication | 2015 |
| Dekor Bolig AS | Professional & scientific | 2016 |
| Deltaalarm AS | Professional & scientific | 2002 |
| Devico AS | Professional & scientific | 1988 |
| Devico International Operation AS | Professional & scientific | 2010 |
| Devico USA AS | Professional & scientific | 2015 |
| Diamanten 9 AS | Education | 1986 |
| Din Engros AS | Wholesale & retail | 2012 |
| Din Helseklinikk AS | Health & social care | 2026 |
| Din Invest AS | Real estate | 2010 |
| Din Ressurs AS | Administrative & support | 2016 |
| Dineanbud AS | Information & communication | 2022 |
| Disena Netthandel Da | Wholesale & retail | 2022 |
| Ditch AS | Professional & scientific | 2018 |
| Diz AS | Wholesale & retail | 2012 |
| Djupvika Utvikling AS | Real estate | 2017 |
| DM Multiservice AS | Administrative & support | 2021 |
| Dokart Ans | Information & communication | 1992 |
| Drivet AS | Real estate | 2020 |
| Dronningens Bolig AS | Real estate | 2008 |
| Drømmeboligen AS | Construction | 2017 |
| Duttestien Barnehage AS | Education | 2010 |