| Bullvest AS | | 2012 |
| Bunadtorget AS | Information & communication | 2014 |
| Bygdø Allé 61 AS | Real estate | 2015 |
| Bygg Dykk Entreprenør AS | Construction | 1994 |
| Byhold AS | | 2018 |
| Byrom 2 AS | Real estate | 2021 |
| Byrom AS | Real estate | 1999 |
| Båni Holding AS | | 2006 |
| Bønes Eiendom AS | Real estate | 2013 |
| C & C Prosjektutvikling AS | Real estate | 2015 |
| C 3 Holding Norway AS | Real estate | 1988 |
| C 3 Holding Norway Drift AS | | 2024 |
| C.W. Downer AS | Professional & scientific | 2011 |
| C3 Holding AS | Construction | 2004 |
| C3YC AS | Transport & logistics | 2024 |
| Caka AS | Manufacturing | 2005 |
| Calder AS | | 2021 |
| Camelote AS | Financial services | 2009 |
| Camillus Media AS | Arts & recreation | 2005 |
| Cangaroo Capital AS | Real estate | 2023 |
| Cape AS | Real estate | 2008 |
| Caprino Filmsenter AS | Information & communication | 1975 |
| Caprino Panoramic Video AS | Information & communication | 1995 |
| CAPRINO360 AS | Information & communication | 2020 |
| Carisbrooke Shipping Norway AS | Professional & scientific | 2008 |
| Casanova AS | Real estate | 2020 |
| Catch&Cargo AS | Wholesale & retail | 2025 |
| Cathmart AS | | 2025 |
| Cato Musæus Consult AS | Professional & scientific | 1998 |
| CBK Utvikling AS | Real estate | 2011 |
| CC3 Holding AS | Other services | 2003 |
| Ceb AS | | 2020 |
| Celero Capital AS | Professional & scientific | 2024 |
| Celestial AS | Professional & scientific | 2023 |
| Celvesta Holding AS | | 2020 |
| Cemiko AS | Mining & quarrying | 2017 |
| Cevic Consulting AS | Professional & scientific | 2023 |
| Cevic Holding AS | Professional & scientific | 2012 |
| Cevic Properties AS | Real estate | 2023 |
| CF Morgenstierne AS | Professional & scientific | 2025 |
| CFS Invest AS | Professional & scientific | 2005 |
| Change Com AS | Financial services | 2006 |
| Chaos Capital AS | Financial services | 2009 |
| Chrismarjan AS | Financial services | 2005 |
| Christian Fredrik Kroepelien AS | Health & social care | 2022 |
| Christian Syverstad AS | Financial services | 2006 |
| Christiania Barnehaver AS | Education | 1997 |
| Cilli Holding AS | | 2022 |
| Cim Invest AS | Real estate | 2023 |
| Citadell Holding AS | | 2022 |
| Clearvision Holding AS | Real estate | 2005 |
| Como Capital AS | | 2018 |
| Como Invest AS | Real estate | 2014 |
| Connex AS | Wholesale & retail | 2004 |
| Core Subsea AS | Wholesale & retail | 2002 |
| Cosm AS | Financial services | 2017 |
| Creato AS | Professional & scientific | 1991 |
| Cresta Capital AS | | 2026 |
| Crew Sport AB | | 1996 |
| CRH Invest AS | | 2021 |
| Crux AS | Real estate | 1988 |
| Cto Nuf | Professional & scientific | 2008 |
| Ctrebler AS | | 2022 |
| Curia Capital AS | Professional & scientific | 2021 |
| CVH Eiendom AS | Real estate | 2013 |
| Dahling Invest AS | Professional & scientific | 2023 |
| Darren Invest AS | | 2022 |
| Dartride AS | Transport & logistics | 2016 |
| Decibel Norge AS | Information & communication | 2026 |
| Deko Design AS | Professional & scientific | 2018 |
| Dema AS | Real estate | 2006 |
| Denavio Holding AS | | 2014 |
| Dentadm AS | Professional & scientific | 2012 |
| DGL AS | | 2025 |
| Dinen Holding AS | | 2020 |
| Dipiu AS | Wholesale & retail | 2008 |
| Diplodocus Holding AS | | 2020 |
| Draug Holding AS | | 2005 |
| Dream Team Racing AS | Other services | 2024 |
| Driftco 100 AS | Real estate | 2021 |
| Driv Norge AS | Wholesale & retail | 1993 |
| Duvendans AS | | 2022 |
| Dyrdal Invest AS | Transport & logistics | 2005 |
| Dyvika Maskin AS | Construction | 2023 |
| E-Vekst AS | Wholesale & retail | 2018 |
| Eba Investments AS | | 2024 |
| Edorf Invest AS | Professional & scientific | 2006 |
| Efto Invest 2 AS | Financial services | 2012 |
| Egs Invest AS | Financial services | 2005 |
| Eiendomspartner AS | Real estate | 1995 |
| Eiffel AS | Information & communication | 2008 |
| Eirik Albrigtsen Consulting AS | | 2026 |
| Eisa Invest AS | Financial services | 2001 |
| Ek Malerfirma AS | Construction | 2021 |
| Ekg AS | Professional & scientific | 2021 |
| Eksersis AS | Education | 2019 |
| Elco Invest AS | Financial services | 1989 |
| Elfinans AS | Professional & scientific | 1995 |
| Elgaaen Gruppen AS | Real estate | 2005 |
| Eltakstsentralen AS | Information & communication | 2018 |