| Circle AS | Professional & scientific | 2022 |
| Citon Invest AS | Real estate | 2013 |
| Citra Invest AS | Wholesale & retail | 2017 |
| Citron Studio AS | Professional & scientific | 2026 |
| City-Med AS | Health & social care | 2014 |
| Clarion Hotel Tyholmen AS | Hospitality | 1988 |
| Class Abroad AS | Administrative & support | 2019 |
| Clownfish AS | Administrative & support | 2023 |
| Coast Guitars AS | Wholesale & retail | 2021 |
| Coban AS | Hospitality | 2024 |
| Commeo Holding AS | Professional & scientific | 2021 |
| Comontering AS | Construction | 2022 |
| Compass Holdings AS | | 2023 |
| Con Energy AS | Professional & scientific | 2023 |
| Consto Anlegg Sør AS | Construction | 2019 |
| Corneliussen Optikk Arendal AS | Wholesale & retail | 2019 |
| Corner Arendal AS | Wholesale & retail | 2002 |
| Costa Living AS | Hospitality | 2025 |
| Crayonworks Invest AS | | 2025 |
| Creatrix AS | Information & communication | 2016 |
| Cross Trafikkskole AS | Education | 2025 |
| Csub AS | Manufacturing | 2003 |
| Csub Group Holding AS | Manufacturing | 2021 |
| Ctrl Alt Complete AS | Information & communication | 2017 |
| Curae Norge AS | Professional & scientific | 2017 |
| CW Bil AS | Wholesale & retail | 2025 |
| D2N Invest AS | Professional & scientific | 2017 |
| Dal Eiendommer AS | Real estate | 2020 |
| Dampen Eiendom AS | | 2025 |
| Dan Fredrik Oustad Invest AS | Wholesale & retail | 2002 |
| Dannevig Foto AS | Professional & scientific | 1997 |
| Dannevigs Båtbyggeri AS | Manufacturing | 2026 |
| Daro Invest AS | Real estate | 2012 |
| Datex AS | Information & communication | 1981 |
| Davidsen Holding AS | Administrative & support | 2007 |
| DB Holding AS | Professional & scientific | 2023 |
| Dbcompaniet Da | Wholesale & retail | 2008 |
| DBL AS | Professional & scientific | 2019 |
| DC Vedlikehold AS | Administrative & support | 2021 |
| Dcno 1 AS | | 2021 |
| Dcno 2 AS | Professional & scientific | 2022 |
| Dcno Holding AS | | 2019 |
| De Presno & Partnere AS | Real estate | 2007 |
| De Presno Holding AS | Real estate | 2010 |
| Deal AS | Professional & scientific | 2010 |
| Dekningsmateriell AS | Manufacturing | 1999 |
| Delina Gruppen AS | Wholesale & retail | 2024 |
| Den Lekende Skomager AS | Other services | 2024 |
| Den Siste Reisen-Begravelsesbyrå Sørlandet AS | Other services | 2023 |
| Den Skreddersydde Enhet AS | Health & social care | 2014 |
| Den Skreddersydde Enhet Eiendom AS | Real estate | 2021 |
| Den Skreddersydde Enhet Holding AS | Health & social care | 2021 |
| Dermaestetikk AS | Other services | 2026 |
| Designum AS | Manufacturing | 2008 |
| Desiree Interiør AS | Wholesale & retail | 2026 |
| Dgdi AS | Professional & scientific | 2026 |
| Digipos AS | Information & communication | 2019 |
| Din Forsikring AS | Financial services | 2023 |
| Din Handel Arendal AS | Wholesale & retail | 2025 |
| Dinas Bygg AS | Construction | 2014 |
| Dings AS | Hospitality | 2023 |
| Dinhelsearendal AS | Health & social care | 2025 |
| Dippner AS | Professional & scientific | 2019 |
| DJ Invest AS | Real estate | 2005 |
| Doktormøster AS | Health & social care | 2014 |
| Dolly Myrene AS | Hospitality | 2024 |
| Donut House Holding AS | Wholesale & retail | 2015 |
| DP Arendal AS | Hospitality | 2022 |
| Dpf-Rens Norge AS | Other services | 2012 |
| DR. Klems Klinikk AS | Health & social care | 2013 |
| DR. Krohns Veg 20 AS | Real estate | 2013 |
| Dream Eiendom AS | Real estate | 2023 |
| Drift Eiendom AS | Real estate | 2026 |
| Drum Brew AS | Manufacturing | 2017 |
| Dråbelia Tjenester AS | Construction | 2012 |
| Dta Holding AS | | 2024 |
| Dukon AS | Administrative & support | 2011 |
| Dukon Holding AS | Real estate | 2011 |
| Dutch Viking AS | Professional & scientific | 2023 |
| Dybdal Eiendomsinvest AS | Real estate | 2020 |
| Dyvig Consulting AS | Professional & scientific | 2026 |
| Dyvig Holding AS | Financial services | 2016 |
| Data Tracer International A/S | Administrative & support | 1986 |
| E & K Invest AS | | 2022 |
| Eaw Holding AS | Construction | 2005 |
| Ecit Normann & Øygarden AS | Professional & scientific | 2017 |
| Edge Advice AS | Professional & scientific | 2003 |
| Eea Invest AS | Real estate | 2013 |
| Effekt Renhold AS | Administrative & support | 1992 |
| Efs Vision AS | Information & communication | 2024 |
| Egdir Energy AS | Transport & logistics | 2016 |
| Egidius Services AS | Professional & scientific | 2021 |
| Eiendom Sør Holding AS | Real estate | 2022 |
| Eiendomsforvaltning AS | Real estate | 2021 |
| Eiendomsselskapet Langbryggen 3 AS | Real estate | 2011 |
| Eiendomsutvikling Agder AS | Real estate | 2009 |
| Eigevalen Eiendom 1 AS | Real estate | 1983 |
| Eikaas AS | Real estate | 1981 |
| Eima Holding AS | Real estate | 2005 |
| Eimas AS | Real estate | 2019 |