| Casabo AS | Real estate | 2023 |
| Castling AS | | 2018 |
| Cateno AS | Information & communication | 2004 |
| Caterva AS | Real estate | 2024 |
| Cayzo Invest AS | | 2023 |
| CB Dev AS | | 2025 |
| CC Kremmergaarden AS | Other services | 2014 |
| CC Shop AS | Other services | 1997 |
| CC Tanktransport AS | Transport & logistics | 2020 |
| CCL Engineering Norway AS | Professional & scientific | 2013 |
| CCL Holding Norway AS | Construction | 2013 |
| CCL Norway AS | Construction | 2014 |
| Ccom AS | Information & communication | 2004 |
| Cdnil 888 Holding AS | | 2023 |
| CDP Technologies AS | Professional & scientific | 2015 |
| Cecilie Bjørge Holding AS | | 2024 |
| Cervus Holding AS | | 2022 |
| Cestan AS | Professional & scientific | 2017 |
| Cestan Holding AS | | 2024 |
| Cetra Invest AS | Transport & logistics | 1990 |
| Cezary Holding AS | | 2025 |
| Cfo Services AS | Professional & scientific | 2016 |
| Cgi AS | | 2025 |
| Chabli Holding AS | Information & communication | 2015 |
| Chalet Eider AS | Real estate | 2024 |
| Chameleon Eiendom AS | Real estate | 2011 |
| Chess Frisør AS | Other services | 1987 |
| Chic Me AS | Wholesale & retail | 2004 |
| Chimaera Eiendom AS | Real estate | 2012 |
| Chinook AS | Professional & scientific | 2019 |
| Chinook II AS | Real estate | 2020 |
| Chinook Service AS | Professional & scientific | 2010 |
| Chorma Holding AS | | 2023 |
| Chris Holding AS | Wholesale & retail | 2005 |
| Chris Moa Syd AS | Wholesale & retail | 1990 |
| Christian Stølen Holding AS | | 2026 |
| Christiano Invest AS | Transport & logistics | 2013 |
| Christin Pedersen Holding AS | Financial services | 2005 |
| Chérie Brud AS | Wholesale & retail | 2022 |
| Cinque Minuti AS | Hospitality | 2018 |
| Ciratech AS | Wholesale & retail | 2016 |
| Circularis AS | Manufacturing | 2017 |
| Cita Eiendom AS | Real estate | 2009 |
| City Lager Og Parkering AS | Wholesale & retail | 1988 |
| Clean 4 U AS | Administrative & support | 2012 |
| CLM Invest AS | | 2022 |
| Clon Invest AS | | 2020 |
| CLOUD9 Invest AS | | 2020 |
| Clu Holding AS | Financial services | 2005 |
| CLW Holding AS | | 2025 |
| CNV Prosjekt AS | Professional & scientific | 2019 |
| Coastal Technology AS | Information & communication | 2024 |
| Cobit AS | Transport & logistics | 2011 |
| Cobit Bil AS | Administrative & support | 2011 |
| Cod-Export AS | Wholesale & retail | 2001 |
| Codeflex AS | Information & communication | 2022 |
| Codename AS | Information & communication | 2023 |
| Codlife AS | Agriculture & fishing | 2019 |
| Coheria AS | Information & communication | 2026 |
| Coldwater Prawns of Norway AS | Wholesale & retail | 2007 |
| Coldwater Prawns Production AS | Manufacturing | 2010 |
| Collumcapite AS | Health & social care | 2020 |
| Color Line Kioskdrift AS | Wholesale & retail | 2020 |
| Com Eiendom AS | Real estate | 2005 |
| Com Eiendom Stranda AS | Real estate | 2008 |
| Com Eiendom Vestnes AS | Real estate | 2016 |
| Coma Design Da | Manufacturing | 1999 |
| Compendium Invest AS | | 2016 |
| Conachar Mor AS | | 2026 |
| Conmuto AS | Information & communication | 2024 |
| Consultpartner Holding AS | Financial services | 2002 |
| Conta AS | Information & communication | 2012 |
| Conta Group AS | Professional & scientific | 2016 |
| Conta Group Holding AS | Information & communication | 2009 |
| Conta Project AS | Information & communication | 2023 |
| Contabile AS | Professional & scientific | 2018 |
| Container Consult AS | Transport & logistics | 1990 |
| Container Og Kuldeservice AS | Construction | 2000 |
| Contineu AB | Professional & scientific | 2004 |
| Contiva AS | Financial services | 2005 |
| Converto AS | Professional & scientific | 2013 |
| Converto Forvaltning AS | Financial services | 2014 |
| Converto Holding AS | Professional & scientific | 2009 |
| Coop Mega Bekkevoll AS | Wholesale & retail | 2026 |
| Coop Vest Eigedom AS | Real estate | 1997 |
| Coop Vest Eigedom Byrkjelo AS | Real estate | 2018 |
| Coop Vest Eigedom Ulsteinvik AS | Real estate | 2011 |
| Coop Vest Eigedom Ørsta AS | Real estate | 2016 |
| Coping Technology AS | Information & communication | 2020 |
| Corner Footballshop AS | Wholesale & retail | 2025 |
| Corner I Skansen AS | Information & communication | 1963 |
| Corporate Solutions AS | Professional & scientific | 2008 |
| Costalot AS | | 2026 |
| Crag Invest AS | Financial services | 2008 |
| Crimp AS | Education | 2016 |
| Crimp Group AS | Arts & recreation | 2017 |
| Crossfit Moa AS | Arts & recreation | 2014 |
| CSK Holding AS | Real estate | 2005 |
| Current Conservas AS | Manufacturing | 2024 |
| Cutee AS | Real estate | 2016 |