| Connoisseur AS | Education | 2012 |
| Connoisseur Group AS | Information & communication | 2020 |
| Connor AS | Information & communication | 2007 |
| Conny Invest AS | | 2025 |
| Conost Marketer AS | Professional & scientific | 2022 |
| Conost Mirinsight AS | | 2023 |
| Conost Roadguard AS | | 2024 |
| Conpapa AS | | 2024 |
| Conquer Capital AS | | 2024 |
| Conrad Holding AS | | 2023 |
| Conrad Langaard AS | Wholesale & retail | 1962 |
| Conrad Mohr AS | Professional & scientific | 1994 |
| Conrad Mohr Holding AS | Professional & scientific | 2005 |
| Conradi Assurance AS | Financial services | 1976 |
| Conradi-Larsen AS | Real estate | 1991 |
| Conradis Gate 6 Oslo AS | Real estate | 2025 |
| Consal AS | Professional & scientific | 2014 |
| Consal Partners AS | Professional & scientific | 2025 |
| Consarto AS | | 2025 |
| Consci AS | Professional & scientific | 2014 |
| Conscia Norge AS | Information & communication | 2012 |
| Conscious Living AS | Education | 2019 |
| Consea AS | Professional & scientific | 2014 |
| Consea Software AS | Information & communication | 2015 |
| Conseal AS | Construction | 1975 |
| Consec QC Group | Professional & scientific | 1995 |
| Consensio Behandlingssenter AS | Health & social care | 2008 |
| Consensus AS | Professional & scientific | 2021 |
| Consensus Eiendom AS | Real estate | 2006 |
| Consensus Investment AS | | 2010 |
| Consept Cafm Da | Information & communication | 2004 |
| Consept Hairdreams AS | Professional & scientific | 2018 |
| Consequence AS | Professional & scientific | 2019 |
| Consid AS | Information & communication | 2021 |
| Consider AS | Information & communication | 2021 |
| Consigliare AS | Professional & scientific | 2024 |
| Consilimo AS | Wholesale & retail | 1987 |
| Consilium Invest AS | Professional & scientific | 2017 |
| Consilium Norway AS | Professional & scientific | 2004 |
| Consimtx AS | Information & communication | 2016 |
| Consolida Partner AS | Professional & scientific | 2026 |
| Consolo AS | Professional & scientific | 2020 |
| Consolo Holding AS | Professional & scientific | 2020 |
| Consorti AS | Professional & scientific | 2011 |
| Consortium Eiendom AS | Real estate | 2015 |
| Consta AS | Construction | 2023 |
| Constanse Capital AS | | 2023 |
| Constanze AS | Arts & recreation | 2007 |
| Constanze Consulting AS | Health & social care | 2024 |
| Constra AS | Professional & scientific | 2007 |
| Constravia AS | Professional & scientific | 2017 |
| Constravia Invest AS | Professional & scientific | 2021 |
| Constrictor Invest AS | Financial services | 2013 |
| Construct Venture AS | | 2018 |
| Constructe AS | Construction | 2023 |
| Construction Analytics AS | | 2022 |
| Construction City Bygg AS | Construction | 2021 |
| Construction City Cluster AS | Real estate | 2017 |
| Construction City Eiendom AS | Real estate | 2018 |
| Construction City Event Og Media AS | Real estate | 2025 |
| Construction City Parkering AS | Real estate | 2005 |
| Construction City Utleie AS | Real estate | 2020 |
| Construction Concepts AS | Construction | 2026 |
| Construction Logistics Group AS | Professional & scientific | 2023 |
| Construction Management International AS | Professional & scientific | 1992 |
| Construction Solution Service Nuf | Construction | 2015 |
| Constructions and Investments C&N Limited | Professional & scientific | 2021 |
| Constructive Development AS | Real estate | 2001 |
| Constructor Norge AS | Wholesale & retail | 1995 |
| Consulatet Solutions AS | Professional & scientific | 2014 |
| Consult AS | Professional & scientific | 2018 |
| Consult CR AS | Professional & scientific | 2025 |
| CONSULT1 Øst AS | Professional & scientific | 2019 |
| Consultare AS | Professional & scientific | 2008 |
| Consulted AS | Information & communication | 2022 |
| Consulting Energy CF Holding Limited | | 2022 |
| Consulting Energy CF Limited | Professional & scientific | 2022 |
| CONSULTING4YOU AS | Professional & scientific | 2013 |
| Consultingtools Norge AS | Professional & scientific | 1987 |
| Consulto AS | Professional & scientific | 2007 |
| Consultor Energy AS | Professional & scientific | 2012 |
| Consultware AS | Information & communication | 2016 |
| Consumer Connection AS | Professional & scientific | 2013 |
| Consumer Labs AS | Information & communication | 2022 |
| Consummatum AS | Real estate | 2016 |
| Consøk AS | Professional & scientific | 1990 |
| Contabil AS | Professional & scientific | 2019 |
| Contador Holding AS | Financial services | 2013 |
| Contagree AS | Information & communication | 2025 |
| Container Holding AS | Real estate | 2021 |
| Containex Container-Handelsgesellschaft M.B.H. Nuf | Wholesale & retail | 2022 |
| Contango AS | | 1999 |
| Contea Group AS | Construction | 2019 |
| Contego AS | Administrative & support | 2017 |
| Conteir AS | Professional & scientific | 2019 |
| Contemi Holding AS | Information & communication | 2014 |
| Contemi Solutions AS | Information & communication | 2010 |
| Contemplative Holding AS | Information & communication | 2020 |
| Content Holding AS | Arts & recreation | 2023 |
| Content Invest AS | | 2023 |