| CK Publishing AS | Information & communication | 1996 |
| CK Takumi Ventures AS | | 2026 |
| Cke AS | Real estate | 2018 |
| Ckgh AS | | 2026 |
| CKH AS | Financial services | 2015 |
| CKM Eiendom AS | Real estate | 1989 |
| CKS Invest AS | Real estate | 2006 |
| CKS Investment (Norway) AS | | 2015 |
| Cksj Invest AS | | 2024 |
| Cku Byporten AS | Wholesale & retail | 2023 |
| Ckvens AS | Information & communication | 2025 |
| CL Capital AS | | 2020 |
| CL Holding AS | Real estate | 2005 |
| CL NPP AS | Real estate | 2025 |
| CL33 Invest AS | | 2022 |
| Claes AS | Financial services | 2017 |
| Claes Kaulum Holding AS | Real estate | 1994 |
| Claimhunt AS | Water & waste | 2019 |
| Claimly AS | Information & communication | 2026 |
| Claira AS | | 2024 |
| Claire AS | Real estate | 2008 |
| Clairon AS | Professional & scientific | 2025 |
| Clairon Partners AS | Professional & scientific | 2026 |
| Clairon Y AS | Professional & scientific | 2025 |
| Claironite AS | Information & communication | 2025 |
| Clan Invest AS | Professional & scientific | 2005 |
| Clandestinjo AS | Professional & scientific | 2017 |
| Clandestino Tattoo Ans | Other services | 2001 |
| Clanricarde Investment AS | | 2013 |
| Clap Along AS | Information & communication | 2021 |
| Clapp AS | Administrative & support | 2024 |
| Clapp Holding AS | | 2018 |
| Clara AS | Wholesale & retail | 2021 |
| Clara Eiendom AS | Real estate | 1998 |
| Clarence Jensen Eiendom AS | Real estate | 2025 |
| Clarence Jensen Invest AS | | 2019 |
| Clarence Park AS | Professional & scientific | 2013 |
| Clarin AS | Financial services | 1996 |
| Clario AS | Professional & scientific | 2026 |
| Clarity Consulting Group AS | Information & communication | 2015 |
| Clarity Consulting Tech Services AS | Information & communication | 2025 |
| Clarity North Holding AS | | 2025 |
| Clarity Norway Da | Wholesale & retail | 2008 |
| Clark Holding AS | | 2026 |
| Clarkson Hyde Norway AS | Professional & scientific | 2020 |
| Clarksons Business Management AS | Professional & scientific | 2004 |
| Clarksons Core Plus AS | Financial services | 2021 |
| Clarksons Core Plus Midco AS | Real estate | 2021 |
| Clarksons Eiendomsinvest 24 AS | | 2024 |
| Clarksons Eiendomsinvest 25 AS | | 2024 |
| Clarksons Eiendomsinvest 26 AS | | 2024 |
| Clarksons Eiendomsinvest 27 AS | | 2024 |
| Clarksons Eiendomsinvest 28 AS | | 2024 |
| Clarksons Eiendomsinvest 29 AS | | 2024 |
| Clarksons Eiendomsinvest 30 AS | | 2024 |
| Clarksons Eiendomsinvest 4 AS | | 2022 |
| Clarksons Eiendomsinvest 5 AS | | 2022 |
| Clarksons Eiendomsinvest 7 AS | | 2022 |
| Clarksons Eiendomsinvest 8 AS | | 2022 |
| Clarksons Norway AS | Transport & logistics | 1989 |
| Clarksons Project Development AS | Professional & scientific | 2020 |
| Clarksons Project Finance AS | Financial services | 2012 |
| Clarksons Property Management AS | Professional & scientific | 2010 |
| Clarksons Real Estate Investment Management AS | Financial services | 2018 |
| Clarksons Securities AS | Financial services | 1987 |
| Clarus Invest AS | | 2025 |
| Clas Ohlson AS | Wholesale & retail | 1985 |
| Claseda AS | Wholesale & retail | 2016 |
| Classic and Tools AS | Wholesale & retail | 2025 |
| Classic Bar & Lounge AS | Hospitality | 2018 |
| Classic Car Trade AS | Wholesale & retail | 2019 |
| Classic Living 88 AS | Wholesale & retail | 2022 |
| Classic Sportswear AS | Wholesale & retail | 1997 |
| Classic T AS | Transport & logistics | 2024 |
| Classics Holding AS | | 2025 |
| Claude Ans | Wholesale & retail | 2022 |
| Claude Monet Alle I AS | Real estate | 2012 |
| Claude Monets Alle 1 Ans | Real estate | 1997 |
| Claus Borchsvei 19-23 Eiendomsselskap AS | Real estate | 2007 |
| Claus Trondsens Gate 15 AS | Real estate | 2016 |
| Clausen Eiendom AS | Real estate | 2023 |
| Clausen Group AS | | 2023 |
| Clausen Search Invest AS | | 2023 |
| Claussen & Heyerdahl AS | Wholesale & retail | 1968 |
| Clausul Da | Professional & scientific | 1990 |
| Clave Consulting AS | Professional & scientific | 2024 |
| Claverton Ltd | | 1997 |
| Clavia Da | Professional & scientific | 2008 |
| Clavis Consulting AS | Information & communication | 2026 |
| Clawback AI AS | Information & communication | 2022 |
| Clawback AS | Professional & scientific | 2004 |
| Clawback Capital AS | Professional & scientific | 2020 |
| Clawback Yield AS | Real estate | 2009 |
| Claymore AS | Real estate | 2006 |
| Claypond AS | Professional & scientific | 2022 |
| CLC AS | Manufacturing | 2005 |
| Cle Invest AS | Real estate | 2005 |
| Cle Wellness Consulting AS | Health & social care | 2026 |
| Cleageye Productions AS | Professional & scientific | 1995 |
| Clean & Coat Nuf | Manufacturing | 2011 |