| Christiania Securities AS | | 1995 |
| Christiania Security Da | Administrative & support | 1999 |
| Christiania Skibs AS | Real estate | 2010 |
| Christiania Skofabrik AS | Real estate | 1907 |
| Christiania Spigerverk Eiendom Og Utvikling AS | Real estate | 1990 |
| Christiania Sport AS | Wholesale & retail | 2026 |
| Christiania Sport AS | Wholesale & retail | 2001 |
| Christiania Takst & Konsult AS | Real estate | 2024 |
| Christiania Taxi AS | Transport & logistics | 2006 |
| Christiania Teater Scene AS | Arts & recreation | 2022 |
| Christiania Tekniske AS | Construction | 2020 |
| Christiania Torv AS | Real estate | 1995 |
| Christiania Tre Og Metall AS | Construction | 2024 |
| Christiania Utvikling AS | Real estate | 2018 |
| Christiania Vedforretning AS | Wholesale & retail | 2022 |
| Christiania Vekterselskap Da | Administrative & support | 1999 |
| Christiania Ventilasjon AS | Construction | 2022 |
| Christiania VVS AS | Construction | 2024 |
| Christianiakvartalet AS | Real estate | 2020 |
| Christianiakvartalet Eiendomsinvest AS | Real estate | 2023 |
| Christians & Hennie AS | Professional & scientific | 2008 |
| Christians Interiors AS | Wholesale & retail | 1996 |
| Christies Gate 20 Ans | Real estate | 2025 |
| Christies Gate 24 Ans | Real estate | 2025 |
| Christiesgate 19 Tomteselskap AS | Real estate | 2009 |
| Christiesgate 5-7 AS | Real estate | 2018 |
| Christina Aamnes AS | | 2019 |
| Christina Ege Holding AS | Financial services | 2005 |
| Christina Invest AS | | 2023 |
| Christina Skreiberg Productions AS | Arts & recreation | 2017 |
| Christina Stusvik AS | Education | 2005 |
| Christina Søgård Consulting AS | Professional & scientific | 2024 |
| Christine & Co AS | Professional & scientific | 2006 |
| Christine Holding AS | Financial services | 2005 |
| Christine Høst AS | Education | 2023 |
| Christine Høst Holding AS | Education | 2023 |
| Christine Invest AS | Real estate | 2000 |
| Christine Møinichen AS | | 2021 |
| Christine Teig Holding AS | | 2022 |
| Christinedal AS | Real estate | 2023 |
| Christmas Art and Decoration Da | Wholesale & retail | 2004 |
| Christmas Invest AS | Financial services | 2005 |
| Christofer AS | Information & communication | 2023 |
| Christoffer Bergene AS | | 2020 |
| Christoffer Martinsen Holding II AS | Wholesale & retail | 2021 |
| Christoffers AS | | 2020 |
| Christoffersen Holding AS | | 2024 |
| Christonik Norge AS | Manufacturing | 2019 |
| Christopher Strømmen Nicolaysen AS | Information & communication | 2022 |
| Christophersen Madsen Holding AS | Health & social care | 2025 |
| Chrolin AS | | 2026 |
| Chronic Labs AS | Professional & scientific | 2026 |
| Chrono Kapital AS | Construction | 2018 |
| Chronos AS | Information & communication | 2003 |
| Chronos Holding AS | | 2025 |
| Chrysalis Assets AS | Administrative & support | 2023 |
| Chrysopidae AS | Wholesale & retail | 2016 |
| Chrystie Invest AS | Financial services | 2007 |
| Chrysus Invest AS | Financial services | 2014 |
| CHS AS | | 2023 |
| Chtech Holding AS | | 2024 |
| Chubb European Group SE, Norskregistrert Utenlandsk Foretak Nuf | Financial services | 2003 |
| Chubb Life Europe SE, Norskregistrert Utenlandsk Foretak Nuf | Financial services | 2008 |
| Chuck Invest AS | | 2023 |
| Churcheim Brewing SA | Wholesale & retail | 2023 |
| Ci Etf I Iverson Holding AS | Professional & scientific | 2021 |
| Ci V Tetrasub Demo AS | | 2025 |
| Ci V Utsira Norway Holdco AS | | 2023 |
| Ci Xix AS | | 2023 |
| Ci XV AS | Financial services | 2019 |
| Ci Xvii AS | | 2022 |
| Ci Xviii AS | Financial services | 2023 |
| Ci XX AS | | 2023 |
| Ci Xxi AS | | 2026 |
| Cia Capital AS | | 2020 |
| Cia Group PLC | | 1998 |
| Cia Invest AS | Professional & scientific | 2017 |
| Ciba AS | Real estate | 2008 |
| Cibaria AS | Administrative & support | 2004 |
| Cibus AS | Information & communication | 2020 |
| Cibus Clupea AS | Real estate | 2025 |
| Cibus Salmo AS | Real estate | 2021 |
| CIC Event Congress AS | Administrative & support | 1995 |
| CIC Germany Holding AS | | 2023 |
| CIC Group AS | Hospitality | 2021 |
| CIC Group Norway AS | Hospitality | 2022 |
| CIC Holding AS | Hospitality | 2021 |
| CIC Hospitality AS | Professional & scientific | 2018 |
| CIC Management AS | Hospitality | 2020 |
| CIC Operations AS | Hospitality | 2019 |
| CIC Operations Bodø AS | Hospitality | 2025 |
| CIC Operations Flaa AS | Hospitality | 2021 |
| CIC Property AS | Real estate | 2013 |
| Cica Holding AS | Financial services | 2017 |
| Cicci Import Ans | | 1988 |
| Ciccio AS | Wholesale & retail | 2020 |
| Cicero Consulting AS | Information & communication | 1989 |
| Cicero Holding AS | | 2018 |
| Cicja Invest AS | Professional & scientific | 2015 |
| Ciclo AS | Wholesale & retail | 2024 |