| C.T.B. Invest AS | Financial services | 2008 |
| Cabb Eiendom AS | Real estate | 2016 |
| Cabb Holding AS | Real estate | 2016 |
| Calibu AS | | 2022 |
| Californebu Invest AS | | 2024 |
| Cama-Nikri AS | Manufacturing | 2006 |
| Camiko AS | | 2021 |
| Camiko Capital AS | | 2021 |
| Camiko Holding AS | | 2021 |
| Camiko Venture AS | | 2021 |
| Campus H AS | Real estate | 2007 |
| Campus P AS | Transport & logistics | 2007 |
| Campus T AS | Real estate | 2007 |
| Campus X AS | Real estate | 2007 |
| Canlah AS | Professional & scientific | 2005 |
| Catacloud AS | Information & communication | 2017 |
| Catacloud Employee Holding AS | Information & communication | 2022 |
| Catacloud Services AS | Information & communication | 2023 |
| CDH Holding AS | | 2018 |
| Cecnor AS | | 2018 |
| Celeri Technologies AS | Information & communication | 2022 |
| Cemre Holding AS | | 2026 |
| Cero & Etage Norge AS | Wholesale & retail | 2005 |
| Cfo Advisory AS | Professional & scientific | 2024 |
| CG Group AS | Real estate | 2025 |
| CGL Holding Aps | Professional & scientific | 2021 |
| CGL Holding AS | Real estate | 2007 |
| CGL Holding II AS | Financial services | 2010 |
| Chiro Invest AS | Real estate | 2011 |
| Chitra Nordic AS | Administrative & support | 2009 |
| Christian S. Meyer Holding AS | | 2025 |
| Chryssafi Invest AS | | 2026 |
| Ci Holding AS | Real estate | 2020 |
| Ciltric AS | Real estate | 2014 |
| Cisbox Mip AS | | 2026 |
| Claire by Fjand-Tex Norge AS | Wholesale & retail | 1984 |
| Clairewater Invest AS | Financial services | 1997 |
| Clarify AS | Information & communication | 2015 |
| Clarify Holding AS | Professional & scientific | 2001 |
| Classic 11 AS | Wholesale & retail | 2016 |
| Clef Luxury Handbags AS | Manufacturing | 2015 |
| Cleve Broch AS | Professional & scientific | 2012 |
| Clipcanvas AS | Professional & scientific | 2007 |
| Cloudberry Air Management AS | Professional & scientific | 2025 |
| Cmbrå Scandinavian AB Nuf | Wholesale & retail | 2005 |
| Cne AS | Professional & scientific | 2016 |
| Cne Engineering AS | Professional & scientific | 2015 |
| Cne Water Treatment AS | Professional & scientific | 2016 |
| Cobra Investment AS | Real estate | 2018 |
| Cognite AS | Information & communication | 2016 |
| Colbyco AS | Information & communication | 2020 |
| Collidor AS | Professional & scientific | 2005 |
| Communicator AS | Information & communication | 2013 |
| Complai AS | Information & communication | 2020 |
| Comtessen AS | | 2020 |
| Comunita AS | Professional & scientific | 2022 |
| Concept Agency AS | Wholesale & retail | 2013 |
| Conseptroom AS | Professional & scientific | 2017 |
| Copycat Holding AS | Manufacturing | 2021 |
| Coroth Invest AS | | 2022 |
| Corrmatec AS | Professional & scientific | 2016 |
| Corylus Invest AS | | 2021 |
| Cosette Invest AS | | 2018 |
| Crantz Invest AS | Professional & scientific | 2016 |
| Credit Risk Advisors AS | Professional & scientific | 2021 |
| Creyon AS | Information & communication | 2025 |
| Crowdcomms Nordic AS | Information & communication | 2014 |
| Cu.School AS | Information & communication | 2022 |
| Cubby AS | Financial services | 2012 |
| Curida Diatec AS | Manufacturing | 1988 |
| CWT Holding AS | | 2025 |
| D8 Group AS | | 2007 |
| Da Vinci Restauranter AS | Hospitality | 2025 |
| Dahlin-Mwaimu Holding AS | | 2022 |
| Damoe Invest AS | | 2020 |
| Data Call AS | Wholesale & retail | 1980 |
| Datics AS | Information & communication | 2022 |
| Deep Holding AS | | 2025 |
| Dekningspatruljen Holding AS | | 2022 |
| Depart Collection AS | Wholesale & retail | 2002 |
| Dermalys AS | Wholesale & retail | 2017 |
| Destinasjon Kvitfjell AS | Real estate | 2005 |
| Det Tverrfaglige Kunstinstitutt AS | Education | 2005 |
| Detec AS | Information & communication | 1981 |
| Dialogsystem AS | Information & communication | 2012 |
| Digel AS | Information & communication | 2024 |
| Divent AS | Administrative & support | 2022 |
| Djava AS | Hospitality | 2025 |
| Dni Global AS | Information & communication | 2009 |
| Dobro Invest AS | | 2006 |
| Dotnet Internals AS | Information & communication | 2017 |
| Doublea AS | Manufacturing | 2023 |
| DR. Andrea Berz AS | Health & social care | 2014 |
| DR. Dragland AS | Education | 2022 |
| Dragehode Holding AS | | 2024 |
| Dream Broker AS | Information & communication | 2013 |
| Drivn Fornebu AS | Education | 2022 |
| Duero AS | Professional & scientific | 2003 |
| Dumed Norge AS | Wholesale & retail | 2022 |
| Dyrafjord AS | Professional & scientific | 2024 |