| Byggaksess Oslo AS | Construction | 2018 |
| Byggarbeid Norge AS | Construction | 2021 |
| Byggeshop AS | Wholesale & retail | 2007 |
| Byggeteknikk Mariusz Iwanski AS | Professional & scientific | 2025 |
| Båtstø Brug AS | Financial services | 2005 |
| Båtstø Maritim AS | Real estate | 2005 |
| Bærum Elektriske AS | Construction | 1992 |
| Bærum Frisørsalong AS | Other services | 2022 |
| Bærum Gestaltterapi AS | Health & social care | 2025 |
| Bærum International Hub AS | Real estate | 2017 |
| Bærum Pilates Studio / Aktive Føtter AS | Health & social care | 2008 |
| Bærum Pizza & Cafegrill AS | Hospitality | 2022 |
| Bølgen Invest AS | Real estate | 1998 |
| Børnes Holding AS | | 2016 |
| C&Co AS | | 2023 |
| C. Corwin Invest AS | Financial services | 1997 |
| Cabehefa AS | Real estate | 2001 |
| Cafe Tara AS | Hospitality | 2021 |
| Cagr AS | Real estate | 2017 |
| Cajac Holding AS | | 2018 |
| Camilla BD Interiør AS | Professional & scientific | 2020 |
| Canny AS | Administrative & support | 2003 |
| Captiva AS | Financial services | 1998 |
| Carl Grünert Maskinforretning AS | Wholesale & retail | 2002 |
| Cartago AS | Administrative & support | 2014 |
| Carzone AS | Wholesale & retail | 2018 |
| Casa Italia AS | Professional & scientific | 2025 |
| Castings AS | Real estate | 2005 |
| Cawe AS | Financial services | 2005 |
| Cembra AS | Real estate | 2024 |
| Cembra Holding AS | Real estate | 2023 |
| Chaiselongue AS | Real estate | 2008 |
| Chol AS | Professional & scientific | 2021 |
| Christian Rør AS | Construction | 2025 |
| Cifero AS | Professional & scientific | 2006 |
| Cival Holding AS | | 2017 |
| CLH AS | | 2025 |
| CLR Holding AS | | 2025 |
| Cmjs Invest AS | | 2025 |
| CMN Invest AS | Professional & scientific | 2020 |
| Coas AS | Real estate | 2014 |
| Comfix AS | Information & communication | 2015 |
| Computanse AS | Information & communication | 1996 |
| Consiglio AS | | 2005 |
| Conus Invest AS | Financial services | 2006 |
| Coronet Boats AS | Wholesale & retail | 2020 |
| Cost Technology AS | Professional & scientific | 1990 |
| Cresco Invest AS | Real estate | 2021 |
| Current Holding AS | Construction | 2025 |
| CVF Co AS | Real estate | 2005 |
| Cåc Invest AS | Financial services | 2008 |
| D & D Eiendom AS | Real estate | 2021 |
| D-Ih AS | Construction | 2019 |
| D-Light AS | Wholesale & retail | 2019 |
| Da Vinskiåsen Bolig AS | Real estate | 2020 |
| Dab Invest AS | Real estate | 2016 |
| Daehyung Electric Power Co.Ltd. Nuf | Construction | 2025 |
| Dag Kristen Solberg Holding AS | | 2023 |
| Dalekovod Norge AS | Professional & scientific | 2012 |
| Dalekovod Nuf | Construction | 2004 |
| Damholtet AS | Arts & recreation | 2025 |
| Dansk Rørteknikk AS | Administrative & support | 2012 |
| Dapen AS | Professional & scientific | 2021 |
| Data-Secure AS | Information & communication | 2005 |
| Datamate AS | Information & communication | 1982 |
| Daycast Entertainment AS | Arts & recreation | 2024 |
| Debina Nuf | Other services | 2011 |
| Decenium AS | Health & social care | 2013 |
| Dekkfix AS | Other services | 2024 |
| Dekkklar AS | Other services | 2026 |
| Det Gule Huset AS | Other services | 1997 |
| Det Norske Veritas Eiendom AS | Professional & scientific | 1962 |
| Det Norske Veritas Holding AS | Professional & scientific | 2012 |
| Digital Pakke AS | Professional & scientific | 2019 |
| Digital Rådgivning AS | Wholesale & retail | 2001 |
| Dinamo Forlag AS | Information & communication | 2003 |
| Dinero.No AS | Information & communication | 2022 |
| Dingjeld AS | Professional & scientific | 2012 |
| Divel Gruppen AS | Real estate | 2005 |
| DNV AS | Professional & scientific | 1988 |
| DNV Business Assurance Group AS | Professional & scientific | 2009 |
| DNV Business Assurance Norway AS | Professional & scientific | 1990 |
| DNV GL South Africa (Pty) Ltd | Professional & scientific | 2014 |
| DNV Group AS | Professional & scientific | 1984 |
| DNV Inspection AS | Professional & scientific | 2021 |
| DNV Inspection Group AS | Professional & scientific | 2021 |
| DNV Maritime Software AS | | 2024 |
| DNV Maritime Software Holding AS | | 2024 |
| DNV Product Assurance AS | Professional & scientific | 2011 |
| DNV SE | Professional & scientific | 2012 |
| DR. Roarsen AS | Health & social care | 2013 |
| Drangsland Holding AS | | 2005 |
| Drit Forbanna AS | Wholesale & retail | 2017 |
| Dromedille Eiendom AS | Real estate | 2026 |
| Dunker Lyd Og Lys AS | Administrative & support | 2024 |
| DW Holding AS | Financial services | 2018 |
| Dynamics Guides AS | Information & communication | 2020 |
| E M Corwin Spar AS | Financial services | 1996 |
| Eabh Invest AS | | 2020 |
| Eagle Eiendom AS | Real estate | 2003 |