| Contesto AS | Information & communication | 2001 |
| Contour & Wellness AS | Health & social care | 2026 |
| Contress Energy Da | Wholesale & retail | 2007 |
| Coo Deleie I AS | Real estate | 2024 |
| Cool Racing AS | Other services | 2025 |
| Coop Mega Lund AS | Wholesale & retail | 2026 |
| Coop Prix Risør AS | Wholesale & retail | 2026 |
| Coop Sørvest SA | Wholesale & retail | 1993 |
| COOPER8 AS | Information & communication | 2026 |
| Coowner AS | Real estate | 2020 |
| Coowner Norge AS | Real estate | 2021 |
| Core Advisory AS | Information & communication | 2026 |
| Coretto AS | Construction | 2018 |
| Coretto Byggdrift AS | Administrative & support | 2021 |
| Corneliussen AS | Construction | 2014 |
| Corneliussen Holding AS | Real estate | 2014 |
| Corporate Rebel AS | Professional & scientific | 2021 |
| Cosl Innovator Pte Ltd Nuf | Mining & quarrying | 2016 |
| Cosl Norwegian AS | Mining & quarrying | 2008 |
| Cosl Offshore Management AS | Mining & quarrying | 2006 |
| Cosl Pioneer Pte Ltd Nuf | Mining & quarrying | 2016 |
| Cosl Promoter Pte Ltd Nuf | Mining & quarrying | 2016 |
| Cosl Rig Ltd | Professional & scientific | 2007 |
| Course AS | Arts & recreation | 2007 |
| CR & J AS | Real estate | 1976 |
| Crane Norway Engineering AS | Professional & scientific | 2010 |
| Crane Norway Group AS | Construction | 2016 |
| Crane Norway Rental AS | Administrative & support | 2025 |
| Crane Norway Vest AS | Construction | 1979 |
| Crane Tech AS | Manufacturing | 2006 |
| Crane Worldwide Logistics Norway AS | Transport & logistics | 2026 |
| Createch AS | Professional & scientific | 2000 |
| Creative Magic AS | Professional & scientific | 2023 |
| Credo Revisjon AS | Professional & scientific | 2010 |
| Creo Logistikk AS | Transport & logistics | 2025 |
| Creolink AS | Wholesale & retail | 2022 |
| Crevue AS | Information & communication | 2016 |
| Crifo Centura AS | Wholesale & retail | 1995 |
| Crossway Eagle LLC Nuf | Professional & scientific | 2020 |
| Crystal Fashion Norway AS | Wholesale & retail | 2022 |
| Csago AS | | 2021 |
| CSS AS | Professional & scientific | 2010 |
| CSV Eiendom Arendal AS | Real estate | 2008 |
| CSV Eiendom Austmannaveien AS | Real estate | 1988 |
| CSV Eiendom Brueland AS | Real estate | 2020 |
| CSV Eiendom Bryne Stadion AS | Real estate | 2024 |
| CSV Eiendom Egils Vei AS | Real estate | 2019 |
| CSV Eiendom Evje AS | Real estate | 2023 |
| CSV Eiendom Grimstad AS | Real estate | 2014 |
| CSV Eiendom Ime AS | Real estate | 2023 |
| CSV Eiendom Lillesand AS | Real estate | 2004 |
| CSV Eiendom Lyngdal AS | Real estate | 2011 |
| CSV Eiendom Mandal AS | Real estate | 2017 |
| CSV Eiendom Marvika Torv AS | Real estate | 2017 |
| CSV Eiendom Nodeland AS | Real estate | 2025 |
| CSV Eiendom Oltedal AS | Real estate | 2003 |
| CSV Eiendom Sandnes AS | Real estate | 2015 |
| CSV Eiendom Stord AS | Real estate | 2026 |
| CSV Eiendom Sørlandsparken AS | Real estate | 2011 |
| CSV Eiendom Sørlandssenteret AS | Real estate | 2012 |
| CSV Eiendom Tangen Torv AS | Real estate | 2023 |
| CSV Eiendom Torsby AS | Real estate | 2023 |
| CSV Eiendom Tronsholen AS | Real estate | 2020 |
| CSV Eiendom Vabakkjen AS | Real estate | 2026 |
| CSV Eiendom Valle AS | Real estate | 2018 |
| CSV Eiendom Varhaug AS | Real estate | 2008 |
| CSV Eiendom Vennesla AS | Real estate | 2016 |
| CSV Eiendom Vågsbygd AS | Real estate | 2014 |
| CSV Eiendom Åkra AS | Real estate | 2023 |
| Cten Eiendom AS | Real estate | 2026 |
| Cubility AS | Professional & scientific | 2005 |
| Cubility Services AS | Wholesale & retail | 2018 |
| Culina Forus 22 AS | Wholesale & retail | 2021 |
| Cura Invest AS | Real estate | 2014 |
| Curo Eiendom AS | Real estate | 2011 |
| Current Technology AS | Professional & scientific | 2024 |
| Cursos AS | Professional & scientific | 2016 |
| Cut & Go AS | Other services | 2026 |
| Cutbend AS | Manufacturing | 2019 |
| CV Holding AS | | 2021 |
| Cyberwell Technology AS | Professional & scientific | 2020 |
| Cybulski Bygg Malerservice AS | Construction | 2025 |
| Cyviz AS | Wholesale & retail | 1992 |
| D Øvstebø Eiendom AS | Real estate | 1986 |
| Da Blue Osean Services | Professional & scientific | 1990 |
| Daco Eiendom AS | Real estate | 1998 |
| Daco Holding AS | Professional & scientific | 2005 |
| Daco Marine AS | Transport & logistics | 2005 |
| Dad Holding AS | | 2025 |
| Dahl G.I. AS | Professional & scientific | 2024 |
| Dahle AS | Financial services | 2015 |
| Dal Eiendom AS | Real estate | 2025 |
| Dalema AS | Wholesale & retail | 2018 |
| Dalema Drift AS | Wholesale & retail | 2018 |
| Dalema Eiendom AS | Real estate | 2018 |
| Dalema Holding AS | Wholesale & retail | 2019 |
| Dalema Holding II AS | Wholesale & retail | 2019 |
| Dalema Holding III AS | Wholesale & retail | 2019 |
| Dalema Holding IV AS | Wholesale & retail | 2019 |
| Dalema Invest AS | Wholesale & retail | 2021 |