| CBF Holding AS | Professional & scientific | 2020 |
| CC Invest AS SPV AS | | 2018 |
| CCD Eiendomstjenester AS | Construction | 2018 |
| CCD Invest AS | | 2021 |
| Cco Invest AS | | 2020 |
| Cdiamant AS | Real estate | 2016 |
| Cealtech AS | Manufacturing | 2012 |
| Ceb Investering AS | Information & communication | 2023 |
| Cecilie Holding AS | | 2021 |
| Cecilie Sunde Holding AS | Real estate | 2011 |
| Cegal LLC | Administrative & support | 2015 |
| Cejsim AS | Health & social care | 2020 |
| Celesta Tasta AS | Hospitality | 2020 |
| Celestial Scourge AS | Arts & recreation | 2025 |
| Celin Trana Interiør AS | Professional & scientific | 2014 |
| Cell Invest AS | Wholesale & retail | 2022 |
| Cellando AS | Real estate | 2021 |
| Cementen AS | Hospitality | 2003 |
| Cenit Consulting AS | Professional & scientific | 2021 |
| Centiva AS | Wholesale & retail | 2019 |
| Central AS | Real estate | 2006 |
| Central Park Ans | Transport & logistics | 2009 |
| Centrica PLC | Energy | 2012 |
| Centrum Apartments AS | Real estate | 2019 |
| Centrum Apartments Rental AS | Real estate | 2021 |
| Centrum Rør AS | Construction | 2004 |
| Centurion AS | | 2001 |
| Cero Productions AS | Information & communication | 2023 |
| Cesa Invest AS | Financial services | 2005 |
| Cessler AS | | 2005 |
| Ceylon Capital Management AS | | 2024 |
| CF Stavanger AS | Arts & recreation | 2023 |
| Cfo Invest AS | Health & social care | 2020 |
| Cfph AS | Real estate | 2016 |
| CG Engineering AS | Professional & scientific | 2010 |
| CGG AS | Real estate | 2025 |
| Champagne Supernova AS | | 2021 |
| Chapeau Stavanger AS | Wholesale & retail | 2024 |
| Chargerly AS | Manufacturing | 2022 |
| Charging AS | Professional & scientific | 2021 |
| Charmilla Invest AS | Construction | 2005 |
| Chatreu Invest AS | | 2013 |
| Chay Vegan AS | Hospitality | 2021 |
| CHECK-6 International Nuf | Education | 2012 |
| CHECK-6 Norway AS | Education | 2012 |
| Checkpoint Charlie AS | Hospitality | 1987 |
| Checkpoint Charlie Audio Productions AS | Information & communication | 2002 |
| Checkpoint Club AS | Hospitality | 2015 |
| Chef Invest AS | | 2021 |
| Chek AS | Hospitality | 2007 |
| Chewable AS | Information & communication | 2024 |
| Chezville AS | Information & communication | 2011 |
| Chiang Mai Capital AS | | 2022 |
| Chili Chocolate AS | Manufacturing | 2016 |
| Chili Kjøkkenutstyr AS | Wholesale & retail | 2000 |
| China Town AS | Hospitality | 2024 |
| China Trading AS | Wholesale & retail | 2002 |
| China Wok Take Away AS | Hospitality | 2011 |
| Chinvestment AS | Real estate | 2013 |
| Chipmunks AS | | 2020 |
| Chiu Yin Holding AS | Financial services | 2018 |
| Cho Holding AS | | 2021 |
| Chrisfam AS | Real estate | 2006 |
| Chrisithma AS | Manufacturing | 2005 |
| Christal AS | Financial services | 1989 |
| Christer Bru Holding AS | Financial services | 2016 |
| Christer Olsnes Eiendom AS | Real estate | 2020 |
| Christian August Thorings Veg 5 AS | Real estate | 2021 |
| Christian Wegner AS | Financial services | 2005 |
| Christine Midbøe AS | | 2024 |
| Christine R. Invest AS | | 2023 |
| Ciaj HN AS | Health & social care | 2018 |
| Cicons AS | Real estate | 2020 |
| Cid Frilans Limited Nuf | Professional & scientific | 2024 |
| Cifra AS | Professional & scientific | 2024 |
| Cinclus V AS | Professional & scientific | 2020 |
| Cinera AS | | 2022 |
| Cinéography AS | Wholesale & retail | 2026 |
| Circus AS | Real estate | 2005 |
| Cis Nordics AS | Information & communication | 2019 |
| Cita AS | Professional & scientific | 1990 |
| City Apartment Hotel AS | Real estate | 2006 |
| City Cut Stavanger AS | Other services | 2022 |
| City Housing AS | Hospitality | 1997 |
| City Housing Holding AS | Real estate | 2000 |
| City Housing Kirkebakken AS | Real estate | 2011 |
| City Housing Lagård AS | Real estate | 1993 |
| City Housing Utleie AS | Real estate | 2021 |
| Cityislet AS | Information & communication | 2015 |
| Cives AS | Professional & scientific | 2013 |
| CJ Tech AS | Information & communication | 2026 |
| CJN Invest AS | | 2026 |
| CK Sports AS | Arts & recreation | 2023 |
| Ckci AS | | 2023 |
| CL Consultancy (UK) Limited | Professional & scientific | 2010 |
| Clap Hands AS | | 2019 |
| Clarion Hotel Energy AS | Hospitality | 2005 |
| Clarion Hotel Stavanger AS | Hospitality | 1999 |
| Clascom AS | Professional & scientific | 2020 |
| Class of '17 AS | | 2021 |