| Chosen AS | Wholesale & retail | 2017 |
| Chosen Holding AS | Wholesale & retail | 2022 |
| CHR IV Gate Holding AS | Real estate | 2011 |
| Chricon AS | Construction | 1998 |
| Christensen Eiendom Ans | Real estate | 1989 |
| Christensen Urologi AS | Health & social care | 2021 |
| Christhom AS | Wholesale & retail | 2007 |
| Christiane Kølling AS | Other services | 2024 |
| Christiansand Backline Service AS | Arts & recreation | 2013 |
| Christiansand Taxi AS | Transport & logistics | 2015 |
| Christiansen Holding AS | | 2020 |
| Christiansholm AS | Professional & scientific | 2022 |
| Christianssand Dentallaboratorium AS | Manufacturing | 2000 |
| Christianssand IT AS | Information & communication | 2024 |
| Christianssand Marina AS | Administrative & support | 2019 |
| Christianssands Rederi AS | Transport & logistics | 2024 |
| Christin Dahl AS | Education | 2023 |
| Chum Holding AS | Real estate | 2021 |
| Chum Technology AS | | 2025 |
| Cifo Management AS | Professional & scientific | 2013 |
| Circles Productions Da | Arts & recreation | 2001 |
| Circuit 8 Da | Arts & recreation | 2025 |
| Circus Arredondo AS | Information & communication | 2026 |
| Cita Klipp AS | Other services | 2020 |
| Citti Sjåførutleie AS | Transport & logistics | 2023 |
| City Train Holding AS | Transport & logistics | 2019 |
| City Train Kristiansand AS | Transport & logistics | 2024 |
| Citybox Kristiansand AS | Hospitality | 2021 |
| Cja Holding AS | Real estate | 2020 |
| CKM AS | | 2019 |
| CL Holdco AS | | 2026 |
| Clarion Hotel Ernst AS | Hospitality | 1986 |
| Classic Action AS | Wholesale & retail | 2001 |
| Clausen Invest AS | | 2026 |
| Clavem AS | Real estate | 2019 |
| CLC Group AS | | 2026 |
| CLC Motion AS | Wholesale & retail | 2026 |
| Cleanfish Equipment AS | Professional & scientific | 2020 |
| Cleanor AS | Administrative & support | 2026 |
| Cleanor Group AS | | 2026 |
| Cleantiki AS | Professional & scientific | 2018 |
| Clevio AS | Information & communication | 2025 |
| Click and Stay AS | Hospitality | 2026 |
| Climate Finance AS | Education | 2022 |
| Clinique Lovisa AS | Health & social care | 2001 |
| Cloud City AS | Financial services | 2012 |
| Clsf AS | Wholesale & retail | 2019 |
| Club 21 AS | | 2022 |
| Club Management AS | Wholesale & retail | 2018 |
| CM Kontor & Data Ans | Wholesale & retail | 1997 |
| CM Nyhus Holding AS | Professional & scientific | 2019 |
| CMM Consulting AS | Professional & scientific | 2007 |
| CMM Invest I AS | Professional & scientific | 2018 |
| Cn'D AS | Information & communication | 2022 |
| Co Eiendom AS | Real estate | 2004 |
| Cobra Agenturer AS | Wholesale & retail | 2018 |
| Coconut Consult Ans | Professional & scientific | 2012 |
| Cocopanda Sweden AB Nuf | Wholesale & retail | 2022 |
| Cocopanda Sweden AS | Wholesale & retail | 2026 |
| Cocopanda.De GmbH Nuf | Wholesale & retail | 2022 |
| Cocopanda.Dk AS | Wholesale & retail | 2026 |
| Cocopanda.Dk Nuf | Wholesale & retail | 2022 |
| Cocopanda.Fi AS | Wholesale & retail | 2026 |
| Cocopanda.Fi OY Nuf | Wholesale & retail | 2022 |
| Codegard AS | | 2025 |
| Codeium AS | Information & communication | 2022 |
| Cognerion AS | Information & communication | 2017 |
| Coins AS | | 2024 |
| Cold Water Shipping AS | Administrative & support | 2018 |
| Collett Eiendom AS | Real estate | 2022 |
| Come Back Films AS | Information & communication | 2012 |
| Comer AS | Hospitality | 2007 |
| Comfort Hotel Kristiansand AS | Hospitality | 1986 |
| Comfyseat AS | Wholesale & retail | 2018 |
| Comingtech Europe AS | Real estate | 2005 |
| Como Eiendom AS | Real estate | 2020 |
| Comor AS | Wholesale & retail | 2023 |
| Companion AS | Information & communication | 2026 |
| Complete Fitness AS | Arts & recreation | 2011 |
| CON-2 AS | Real estate | 2004 |
| Con-X AS | Wholesale & retail | 1985 |
| Concise Capital Unit AS | Real estate | 2019 |
| Concordia Viking AS | Transport & logistics | 1990 |
| Connie's Interiør AS | Wholesale & retail | 2012 |
| Conrod Industrier AS | Real estate | 2009 |
| Consilio AS | Professional & scientific | 2023 |
| Consult Gruppen AS | Professional & scientific | 2020 |
| CONSULT1 Sør AS | Professional & scientific | 2021 |
| Continental Ceylon Seafood AS | Agriculture & fishing | 2015 |
| Contrarian Ventures AS | | 2019 |
| Controls AS | Real estate | 2004 |
| Contur AS | Construction | 2021 |
| Cookies and Beans Norge AS | Wholesale & retail | 2024 |
| Coopreneur AS | Education | 2021 |
| Cop Holding AS | Real estate | 2025 |
| Cor-Si AS | Manufacturing | 2020 |
| Cordelia AS | Real estate | 2006 |
| Core Shipbroking AS | Professional & scientific | 2005 |
| Corecapacity AS | Health & social care | 2023 |
| Corecapacity Global AS | Health & social care | 2024 |