| Beautyconsulting AS | Wholesale & retail | 2016 |
| Beckasin Trading AS | Wholesale & retail | 1996 |
| Bella Napoli A/S | Hospitality | 2025 |
| Bergheim Eiendomsservice AS | Real estate | 2007 |
| Best Service Transport AS | Transport & logistics | 2009 |
| Bezo AS | Real estate | 2021 |
| Bfa Holding AS | | 2026 |
| Bidtnes Dagligvare AS | Wholesale & retail | 2024 |
| Billink AS | Information & communication | 2011 |
| Bilplan AS | Wholesale & retail | 1994 |
| Bilservice Skedsmo AS | Other services | 2018 |
| Bilu AS | Education | 2012 |
| BJ Rør AS | Construction | 2019 |
| Bjaanes Holding AS | Wholesale & retail | 2021 |
| Bjørkelangen Tomteutvikling AS | | 2011 |
| Bloodycatch AS | Administrative & support | 2024 |
| Blue Point AS | Other services | 1986 |
| BM 1 Eiendom AS | Real estate | 2012 |
| Bolig Eksperten AS | Construction | 2022 |
| Boligspesialisten Eiendomsutvikling AS | Construction | 2004 |
| Bonk Consulting AS | Information & communication | 2015 |
| Boon Coach AS | Other services | 2023 |
| Brageskaal AS | Financial services | 2015 |
| Brakettcompagniet AS | Wholesale & retail | 2011 |
| Breiflåtveien 15/21 AS | Real estate | 1979 |
| Bring Warehousing AS | Transport & logistics | 1968 |
| Brodersen Holding AS | Financial services | 2024 |
| Brånåstoppen Fus Barnehage AS | Education | 2002 |
| Brødrene Andresen AS | Transport & logistics | 2006 |
| BS Investeringsselskap AS | Administrative & support | 2015 |
| BT Anlegg AS | Construction | 2017 |
| Bukken Bruse Holding AS | Financial services | 2018 |
| Burmeister AS | Wholesale & retail | 2011 |
| Burmeister Eiendom AS | Real estate | 2004 |
| Bygg- Og Anleggsbetong AS | Construction | 2021 |
| Byggmakker Handel AS | Wholesale & retail | 1999 |
| Bårdseng AS | Real estate | 2021 |
| Bølerveien 71 AS | Real estate | 2016 |
| Børudgustavsen AS | Arts & recreation | 2021 |
| C Grindvold AS | Wholesale & retail | 1962 |
| Cabin Living AS | Real estate | 2017 |
| Cabpartnertnfin Vi AS | Financial services | 2010 |
| Carigosa AS | Administrative & support | 1998 |
| Cashman Invest AS | | 2022 |
| Causas Holding AS | Construction | 2013 |
| CBK Distribusjon AS | Wholesale & retail | 2010 |
| Ce-Invest AS | | 2025 |
| Cem. Holding AS | Financial services | 2020 |
| CG Transport Service AS | Transport & logistics | 2026 |
| CGH Holding AS | Wholesale & retail | 2008 |
| Chebu AS | Wholesale & retail | 2019 |
| Chemistry AS | Information & communication | 2000 |
| Chemsmart AS | Wholesale & retail | 2020 |
| CHG Bruktbil AS | Wholesale & retail | 2025 |
| Cho Consulting AS | Professional & scientific | 2025 |
| Clean Deal Renholdsservice AS | Administrative & support | 2016 |
| Clinitech Norge AS | Information & communication | 2026 |
| Coach Together AS | Education | 2023 |
| Compass Fairs AS | Administrative & support | 1996 |
| Consat Norge AS | Professional & scientific | 2012 |
| Consto Anlegg AS | Construction | 1986 |
| Consto Anlegg Øst AS | Construction | 2015 |
| Cresco AS | | 2026 |
| Crossroad Travels AS | Administrative & support | 2025 |
| Csstreaming Ans | Information & communication | 2020 |
| CW Lundberg Norge AS | Construction | 2011 |
| D.A.F Spedition Norge AS | Transport & logistics | 2008 |
| Dactari AS | Information & communication | 2002 |
| Dahl Kingsrud Holding AS | | 2019 |
| Danceoutfits AS | Wholesale & retail | 2025 |
| Datareparatørene Ans | Other services | 2003 |
| Deutsch Holding AS | Financial services | 2017 |
| Deutsche Viking Cargo Nuf | Transport & logistics | 2022 |
| Dhaliwal&Singh AS | Hospitality | 2025 |
| DHL Express (Norway) AS | Transport & logistics | 1991 |
| DHL Global Forwarding (Norway) AS | Transport & logistics | 1965 |
| DHL Supply Chain (Norway) AS | Transport & logistics | 1977 |
| Dimba AS | Information & communication | 2021 |
| Din Regnskapsfører Oslo AS | Professional & scientific | 2022 |
| Dincare AS | Information & communication | 2013 |
| DM Beauty&Health AS | Health & social care | 2023 |
| Donira AS | Professional & scientific | 2015 |
| Dyrebar AS | Wholesale & retail | 2006 |
| Døvigen AS | Wholesale & retail | 1978 |
| E & M Invest AS | Real estate | 2021 |
| E&C Transport AS | Transport & logistics | 2023 |
| E&D Holding AS | | 2026 |
| Ecofurniture AS | Wholesale & retail | 2018 |
| Ecopluss AS | Wholesale & retail | 2022 |
| Eg Consult AS | Professional & scientific | 2025 |
| Egedius Holding AS | Manufacturing | 2024 |
| Eiendomsanalyse AS | Professional & scientific | 1990 |
| Eiendomsanalyse Utvikling AS | Professional & scientific | 2020 |
| Einvik AS | Professional & scientific | 2013 |
| Ekke Invest AS | Real estate | 2007 |
| Ekom AS | Professional & scientific | 2013 |
| El Invest Norge Nuf | Real estate | 2009 |
| Elektrodistribusjon AS | Wholesale & retail | 2017 |
| Elgen Eiendom AS | Real estate | 1944 |
| Elgåen AS | Professional & scientific | 2020 |