| Cabez AS | | 2022 |
| Camina AS | Manufacturing | 2021 |
| Camsir Holding AS | | 2020 |
| Camv Holding AS | Real estate | 2016 |
| Carl Invest AS | | 2021 |
| Caspar Stormsvei 11 AS | Real estate | 2019 |
| Caspari Møbelsnekkeriet AS | Manufacturing | 1998 |
| Catale AS | | 2020 |
| Catch Solar AS | Professional & scientific | 2016 |
| Cato Gabrielsen AS | Wholesale & retail | 2024 |
| Cave Invest AS | Information & communication | 2019 |
| Cawi AS | Real estate | 2006 |
| CBK Eiendom AS | Real estate | 2004 |
| Cemento AS | Wholesale & retail | 2019 |
| Cemento Norge AS | Professional & scientific | 2026 |
| Cervo Consulting AS | Arts & recreation | 2024 |
| Ceska Holding AS | | 2022 |
| Cetium AS | Professional & scientific | 2018 |
| Chasm AS | | 2026 |
| Chess Mates Capital AS | | 2025 |
| Chili Connections AS | Energy | 2025 |
| Chlo-Invest AS | | 2020 |
| Christor Holding AS | | 2025 |
| Civo AS | Information & communication | 2026 |
| CJS Invest AS | | 2019 |
| Clairvoyance AS | Financial services | 2014 |
| Claussen Martinsen AS | Real estate | 2017 |
| Cleanvalley AS | Professional & scientific | 2021 |
| CLK AS | Information & communication | 2017 |
| Cloud Investments AS | Information & communication | 2016 |
| CM Prosjekt AS | Professional & scientific | 1994 |
| Cmax Holding AS | Real estate | 1994 |
| Colorwool AS | Wholesale & retail | 2015 |
| Colt Invest AS | | 2024 |
| Company Wellness AS | Health & social care | 2001 |
| Competitore AS | Real estate | 2017 |
| Competitore Eiendom AS | Real estate | 2006 |
| Compono AS | Financial services | 2017 |
| Con Ganas AS | | 2016 |
| Conadi AS | | 2007 |
| Conic AS | Professional & scientific | 2003 |
| Conjure AS | | 2025 |
| Connect JK AS | | 2024 |
| Connected Health Capital AS | | 2026 |
| Conradi Invest AS | | 2019 |
| Construction Management AS | Professional & scientific | 1984 |
| Convector Group AS | Hospitality | 2024 |
| Convector Management Sentrum AS | Hospitality | 2009 |
| Conveeni Group AS | Transport & logistics | 2018 |
| Coop Vestviken SA | Wholesale & retail | 1972 |
| Coop Åmot Eiendom AS | Real estate | 2025 |
| Core International AS | Professional & scientific | 2008 |
| Crest AS | Professional & scientific | 2023 |
| Criticality AS | Professional & scientific | 2018 |
| CRL Invest AS | | 2023 |
| Cross Invest AS | Real estate | 2004 |
| Csi Invest AS | | 2019 |
| CVS AS | Construction | 1997 |
| CWS Holding AS | Hospitality | 2014 |
| Cyborg AS | | 2021 |
| Cys AS | | 2024 |
| D. Holder AS | Real estate | 2012 |
| Dabe Invest AS | Financial services | 2005 |
| DADDYCOOL2TWO AS | | 2021 |
| Daedalus Invest AS | | 2025 |
| Dahlkonsult AS | Professional & scientific | 2018 |
| Dajede AS | Real estate | 2005 |
| Davanti AS | Professional & scientific | 2023 |
| DD Ventures AS | | 2021 |
| De-Risk Matrix Company AS | Information & communication | 2026 |
| Decentia Invest AS | Real estate | 2011 |
| Deema AS | Financial services | 2017 |
| Deno AS | Real estate | 2011 |
| Dermalog AS | Health & social care | 2012 |
| Desintrygg AS | Professional & scientific | 2020 |
| DHJ Consult AS | Professional & scientific | 2024 |
| Dicte Invest AS | Financial services | 2005 |
| Dietz Foresight AS | Professional & scientific | 2014 |
| Dimoski AS | Information & communication | 2014 |
| Dinkytown Ventures AS | Professional & scientific | 2020 |
| Ditus AS | Financial services | 2003 |
| Djupbekk AS | | 2006 |
| Doc's Bekkestua AS | Health & social care | 2025 |
| Dot AS | | 2025 |
| Drammensveien 88C AS | Real estate | 2022 |
| Dsverdrup Holding AS | | 2023 |
| Duvholt Eiendom AS | | 2023 |
| Duwarinvest AS | | 2025 |
| E&H Company AS | Wholesale & retail | 2025 |
| E.D.A Holding AS | | 2021 |
| E59 Invest AS | | 2022 |
| Eb Capital AS | Financial services | 2007 |
| Eb Consult AS | Professional & scientific | 2014 |
| Ebv 223 AS | Real estate | 2017 |
| Eco Pets AS | Wholesale & retail | 2015 |
| Eddys Kitchen AS | Professional & scientific | 2014 |
| Ee Holding AS | Financial services | 2005 |
| Eeb Holding AS | Professional & scientific | 2021 |
| Efb Holding AS | Health & social care | 2011 |
| Effector AS | Manufacturing | 2005 |