| Cirkulær Holding AS | Wholesale & retail | 2023 |
| Cirkulær Teknologi AS | Information & communication | 2023 |
| Cis Consulting AS | Information & communication | 2004 |
| Cision Norge AS | Professional & scientific | 2009 |
| Ciska AS | Wholesale & retail | 2005 |
| Cisno AS | Information & communication | 2001 |
| Cisser Mæhl AS | Information & communication | 2024 |
| CITADEL21 AS | Information & communication | 2021 |
| Citadell AS | Financial services | 2005 |
| Citadell Eiendom AS | Real estate | 2018 |
| Citadella AS | Professional & scientific | 2005 |
| Citec AB | Wholesale & retail | 2011 |
| Citera AS | Information & communication | 2006 |
| Citibank Europe Public Limited Company Nuf | Financial services | 2015 |
| Citius Holding AS | | 2026 |
| Cito AS | Hospitality | 2023 |
| Citrus Analytics AS | Information & communication | 2025 |
| Citrus AS | Information & communication | 2000 |
| Citrus Holding AS | | 2023 |
| City & Service AS | Construction | 2011 |
| City Aksjeinvest AS | Real estate | 2003 |
| City Bar AS | Hospitality | 2019 |
| City Bolig AS | Real estate | 1997 |
| City Clothing Ans | Wholesale & retail | 1996 |
| City Danmark AS | Real estate | 2017 |
| City Elektro AS | Construction | 2003 |
| City Food AS | Wholesale & retail | 2008 |
| City Haugesund AS | Real estate | 2017 |
| City Holding AS | Real estate | 1989 |
| City Home AS | Information & communication | 2017 |
| City Hus AS | Real estate | 2011 |
| City Import AS | Wholesale & retail | 2014 |
| City Mart AS | Wholesale & retail | 2026 |
| City Matter AS | Other services | 2012 |
| City Renhold AS | Administrative & support | 1978 |
| City Rør AS | Construction | 2006 |
| City Sales Ans | Wholesale & retail | 1995 |
| City Security AS | Administrative & support | 2010 |
| City Self-Storage Norge AS | Real estate | 2025 |
| City Slangzine Da | Information & communication | 2005 |
| City Slice AS | Hospitality | 2020 |
| City Svaneveien 2 AS | Real estate | 2020 |
| City Taktekking AS | Construction | 1951 |
| City Vaskeri AS | Other services | 2013 |
| City Vekst AS | Real estate | 2009 |
| City Vest AS | Real estate | 2024 |
| City-Klinikken AS | Health & social care | 2012 |
| Citybox Oslo AS | Hospitality | 2011 |
| Citybud Ans | Transport & logistics | 2000 |
| Citycharge AS | Administrative & support | 2019 |
| Citycon Herkules Eiendom AS | Real estate | 1998 |
| Citycon Holding AS | Real estate | 2015 |
| Citycon Kilden Eiendom AS | Real estate | 1998 |
| Citycon Kolbotn Torg Eiendom AS | Real estate | 2001 |
| Citycon Kolbotn Torg Næring AS | Real estate | 2004 |
| Citycon Kremmertorget Eiendom AS | Real estate | 1965 |
| Citycon Liertoppen Eiendom AS | Real estate | 1999 |
| Citycon Linderud Eiendom AS | Real estate | 2006 |
| Citycon Norway AS | Real estate | 2012 |
| Citycon Norway Asset Holding AS | | 2025 |
| Citycon Norway Centers Holding AS | Real estate | 2026 |
| Citycon Oasen Eiendom AS | Real estate | 2007 |
| Citycon Residentials Norway AS | Real estate | 2022 |
| Citycon Senterdrift AS | Real estate | 2005 |
| Citycon Solsiden Eiendom AS | Real estate | 1999 |
| Citycon Storbyen Eiendom AS | Real estate | 2007 |
| Citycon Stovner Eiendom AS | Real estate | 1982 |
| Citycon Torvbyen Eiendom AS | Real estate | 1997 |
| Cityguide AS | Professional & scientific | 2021 |
| Cityguide Da | Professional & scientific | 2013 |
| Cityhubs AS | Real estate | 2020 |
| Citymaid Hjemmeservice AS | Administrative & support | 1987 |
| Citymotion AS | Transport & logistics | 2025 |
| Cityswip AS | Wholesale & retail | 2014 |
| Cityterminalen AS | Real estate | 1993 |
| Civ Holding AS | | 2023 |
| Civic Invest AS | Real estate | 2026 |
| Civil Management AS | Professional & scientific | 2019 |
| Civilist AS | Real estate | 2021 |
| Civismo AS | Information & communication | 2020 |
| Civita AS | Professional & scientific | 2003 |
| CJ Renhold Og Hjemmehjelp Service Da | Administrative & support | 2014 |
| CJ Transport AS | Transport & logistics | 2016 |
| Cja AS | Hospitality | 2016 |
| Cja Invest AS | Financial services | 2021 |
| CJB AS | Professional & scientific | 2025 |
| Cjet AS | | 2020 |
| CJG Holding AS | Financial services | 2005 |
| CJH Holding AS | | 2021 |
| CJL Invest AS | | 2025 |
| Cjohansson Invest AS | | 2025 |
| CJS Consulting AS | | 2021 |
| CK Bond AS | Energy | 2018 |
| CK Bygg AS | Construction | 2023 |
| CK Capital AS | Professional & scientific | 2018 |
| CK Eiendomskompetanse AS | Real estate | 2022 |
| CK HCH AS | Real estate | 2021 |
| CK Holding AS | Professional & scientific | 1984 |
| CK Kraftholding Nord AS | | 2007 |
| CK Ness Holding AS | | 2025 |