| C.Jammeh AS | Wholesale & retail | 2024 |
| C.L. Holding AS | | 2022 |
| C.L. Invest AS | | 2021 |
| C.M.S Holding AS | | 2023 |
| C.Moen Invest AS | | 2023 |
| C.Nilsen AS | Manufacturing | 2023 |
| C.O.D. Invest AS | Professional & scientific | 2021 |
| C.P. Finne AS | Financial services | 2015 |
| C1 Holding AS | | 2021 |
| C11 Invest AS | | 2024 |
| C2 Na Limited | Professional & scientific | 2020 |
| C2A Næring AS | Real estate | 2018 |
| C3 Bim AS | Information & communication | 2017 |
| C3M Invest AS | | 1991 |
| C4 Invest AS | Professional & scientific | 2024 |
| C5 Invest AS | Real estate | 2015 |
| Ca & Ok AS | | 2024 |
| Ca 16 Vika AS | Real estate | 2024 |
| Ca 17 Invest AS | Real estate | 2022 |
| Ca 17 Næring AS | Real estate | 2022 |
| Ca 35 Utvikling AS | Real estate | 2025 |
| Ca Agency AS | Wholesale & retail | 2020 |
| Ca Group AS | Manufacturing | 2010 |
| Ca Paus Holding AS | | 2021 |
| Ca Spec Sveising AS | Manufacturing | 2023 |
| Ca-Invest AS | | 2022 |
| Ca-Nor Kjøleindustri AS | Construction | 2025 |
| Ca.No Da | Information & communication | 2000 |
| CA2 Design AS | Professional & scientific | 2024 |
| CA7AF21 AS | | 2024 |
| Caaalm AS | Information & communication | 2025 |
| Caaby AS | Financial services | 2007 |
| Cab Group Norway AS | Administrative & support | 2012 |
| Caba Pictures AS | Information & communication | 2026 |
| Cabana AS | | 2020 |
| Cabanisi AS | Real estate | 2019 |
| Cabesa Elektro AS | Construction | 2017 |
| Cabesa Holding AS | Administrative & support | 2005 |
| Cabezo AS | | 2005 |
| Cabin Campers AS | Administrative & support | 2018 |
| Cabin Crew AS | Information & communication | 2024 |
| Cabis Da | Other services | 2024 |
| Cabo Invest AS | | 2021 |
| Cabom Holding AS | | 2024 |
| Cabonline Norge AS | Transport & logistics | 1997 |
| Cabot Lofoten AS | Real estate | 2024 |
| Cabrera AS | Real estate | 2026 |
| Cacace AS | Real estate | 2002 |
| Cacathug AS | Real estate | 2009 |
| Cace AS | Real estate | 2020 |
| Cace Invest AS | | 2023 |
| Cacharge AS | Energy | 2019 |
| Cache AS | Information & communication | 2026 |
| Cache Invest AS | | 2020 |
| Cachrianto AS | Financial services | 2007 |
| Cacomo AS | Real estate | 2005 |
| Cad Holding AS | Financial services | 2005 |
| Cad-Quality Europe AB | Information & communication | 2012 |
| Cadapp Ans | Information & communication | 1993 |
| Cadas AS | Professional & scientific | 2021 |
| Caddie Eiendom AS | Real estate | 2017 |
| Caddie Golf Scandinavia | Administrative & support | 2024 |
| Caddie Invest AS | Financial services | 2006 |
| Cadena AS | Real estate | 2017 |
| Cadence Holding AS | | 2026 |
| Cadenza Holding AS | Real estate | 2022 |
| Cadi AS | Professional & scientific | 1997 |
| Cadnor AS | Information & communication | 2023 |
| Cadran AS | Information & communication | 2025 |
| Cadre Holding AS | | 2021 |
| Cae AS | Professional & scientific | 2010 |
| Caecon GmbH & Co KG | Professional & scientific | 2008 |
| Caedo Oncology AS | Wholesale & retail | 2020 |
| Caelum Holding AS | | 2023 |
| Caerus Architects AS | Professional & scientific | 2014 |
| Caerus Capital AS | Manufacturing | 2001 |
| Caesar K Invest AS | | 2020 |
| Caewiz Consulting AS | Information & communication | 2012 |
| Caf Norway AS | Wholesale & retail | 2019 |
| Cafe Amsterdam Oslo AS | Hospitality | 2014 |
| Cafe Brunch AS | Hospitality | 2016 |
| Cafe Company AS | Hospitality | 2000 |
| Cafe Cuisine AS | Hospitality | 2005 |
| Cafe Di Roma Da | Hospitality | 2012 |
| Cafe Eclipse AS | Hospitality | 2026 |
| Cafe Europa AS | Hospitality | 2006 |
| Cafe Fellini Da | Hospitality | 1989 |
| Cafe Fiasco AS | Hospitality | 1989 |
| Cafe Karon Ans | Hospitality | 1999 |
| Cafe Leonel Ans | Hospitality | 1988 |
| Cafe Skansen AS | Hospitality | 2012 |
| Cafe Stamboul AS | Hospitality | 2011 |
| Cafe Tekehtopa AS | Hospitality | 1997 |
| Cafe Tenerife AS | Hospitality | 1997 |
| Cafegutta AS | Wholesale & retail | 2026 |
| Cafehuset AS | Hospitality | 1997 |
| Cafekroken Ans | Hospitality | 1996 |
| Cafero AS | Hospitality | 2012 |
| Caflo Asset Management AS | Wholesale & retail | 2020 |
| Caflo Farming AS | Agriculture & fishing | 2017 |