| Bro-Elektro AS | Construction | 2006 |
| Bror Ramberg Invest AS | | 2021 |
| Brunæs Gjenvinning AS | Wholesale & retail | 2014 |
| Bruserud AS | Construction | 2008 |
| Brødrene Næss Invest AS | Construction | 2019 |
| Brødrene Teien Ans | Real estate | 1991 |
| Btriva AS | Real estate | 2018 |
| Buffalo AS | Information & communication | 2025 |
| Buildsmart AS | Construction | 2025 |
| Burgau Invest AS | Financial services | 2016 |
| Buskerud Og Vestfold Båtservice AS | Transport & logistics | 2012 |
| Bygg Eiendom AS | Construction | 2018 |
| Bygge Man AS | Professional & scientific | 2026 |
| Bygghandel AS | Wholesale & retail | 2025 |
| Byggkontoret AS | Professional & scientific | 2012 |
| Byggmester Espegard AS | Construction | 2012 |
| Byggprogress AS | Construction | 2016 |
| Båtplassen AS | Arts & recreation | 2012 |
| Börjes Logistik & Spedition Nuf | Transport & logistics | 2022 |
| Bør Holding AS | Manufacturing | 2015 |
| C Retail Solutions AS | Professional & scientific | 2022 |
| C.B. Service AS | Construction | 1999 |
| Ca-Eiendom AS | Real estate | 2025 |
| Cappit AS | Professional & scientific | 2024 |
| Carchax AS | | 2022 |
| Carling Group AS | Wholesale & retail | 2004 |
| Carlssons Rådgivningstjenester Da | Professional & scientific | 1978 |
| Carner AS | Manufacturing | 2023 |
| CBR Eiendom AS | Wholesale & retail | 2007 |
| Cbsl Holding AS | Professional & scientific | 2018 |
| CC Tekstilservice AS | Other services | 2019 |
| Chance Invest AS | Wholesale & retail | 2005 |
| Charlton Technical Support AS | Construction | 2020 |
| CK Entreprenør AS | Construction | 2016 |
| CL Bygg & Eiendom AS | Construction | 2016 |
| Clickwork AS | Information & communication | 2023 |
| Cloudpm AS | Professional & scientific | 2020 |
| Comq AS | Information & communication | 2010 |
| Contigus AS | Real estate | 2015 |
| Conventus 2 AS | Real estate | 2022 |
| Cortado AS | Wholesale & retail | 2004 |
| Crowndesk Software AS | Information & communication | 2026 |
| Cyberg Studio AS | Arts & recreation | 2022 |
| D'Angeli AS | Education | 2017 |
| Dahlman Anlegg Og Boring AS | Professional & scientific | 2024 |
| Dalsrud Drift AS | Manufacturing | 2024 |
| Dammen & Follestad Rørlegger Service AS | Construction | 2023 |
| Dandelion Invest AS | | 2024 |
| Danielsen Transport AS | Transport & logistics | 2025 |
| David Evensen Eiendom AS | Real estate | 2016 |
| DD Invest AS | Real estate | 2019 |
| Degerby AS | | 2024 |
| Demanor AS | Manufacturing | 1993 |
| Devant Invest AS | | 2023 |
| Devlin AS | Construction | 2026 |
| Devlin Invest AS | | 2026 |
| Digitalflow AS | Wholesale & retail | 2023 |
| Digitalsport AS | Information & communication | 1986 |
| Din Arrangør AS | Arts & recreation | 2016 |
| Dine Drømmemøbler AS | Professional & scientific | 2023 |
| Docpower AS | Health & social care | 2000 |
| Doktorgården Drift Da | Health & social care | 2010 |
| Doktorgården Sande Da | Real estate | 2007 |
| Drammen Automasjon AS | | 2015 |
| Drammen Sales Production AS | Construction | 2019 |
| Drammenspølsa AS | Wholesale & retail | 2026 |
| Drone Management AS | Professional & scientific | 2020 |
| Dunebar Invest AS | Financial services | 2016 |
| Dunihagen AS | Administrative & support | 2010 |
| Dunihagen Drift AS | Real estate | 2012 |
| Dunihagen Eiendom AS | Real estate | 2009 |
| Dunihagen Næring AS | Real estate | 2019 |
| Dvi Eiendom AS | Real estate | 2010 |
| Dyrdahl Invest AS | Real estate | 2020 |
| Dyrehjørnet AS | Wholesale & retail | 2018 |
| E&D Nordic Holding AS | | 2025 |
| E-Tron AS | Construction | 2023 |
| E. Bakke Holding AS | Financial services | 2017 |
| Ebe Bygg AS | Construction | 2020 |
| Eco Swift AS | Transport & logistics | 2026 |
| Eco-Nor Group AS | Wholesale & retail | 2018 |
| Edvardsen Innovasjon AS | | 2021 |
| Eiendom B30 AS | Real estate | 2011 |
| Eikhaugen Næringspark AS | Real estate | 2007 |
| Einerveien 6 a AS | Real estate | 2017 |
| Eirik Bonden Holding AS | | 2021 |
| Ejm AS | Construction | 2023 |
| Ek Anlegg AS | Construction | 2022 |
| Ekelia AS | Real estate | 2012 |
| El-Miljø AS | Construction | 2013 |
| Elceta AS | Construction | 1998 |
| Elceta Invest AS | Construction | 2005 |
| Elegant Elektro AS | Construction | 2026 |
| Elektrocompagniet AS | Wholesale & retail | 2005 |
| Elisabeth Hoven Holding AS | | 2024 |
| Ellon AS | Construction | 2024 |
| Elreg-Elektro AS | Construction | 2014 |
| Ema Capital AS | Real estate | 2026 |
| Emro Holding AS | | 2025 |
| Enco Nordic AS | Wholesale & retail | 2025 |