| Columbi Reklamebyrå Ans | | 1987 |
| Constantia AS | | 1986 |
| Cévenne AS | Professional & scientific | 2014 |
| Côté Sud Interiør AS | Wholesale & retail | 2005 |
| Cø Holding AS | Real estate | 2016 |
| D & a Holding AS | | 2025 |
| D & J Miller | Wholesale & retail | 2012 |
| D & T Nor AS | Construction | 2015 |
| D H a Bemanning AS | Transport & logistics | 2021 |
| D Invest & Consulting AS | Information & communication | 2020 |
| D K N Invest AS | Real estate | 1989 |
| D Risk AS | Professional & scientific | 2022 |
| D S N AS | Wholesale & retail | 2022 |
| D Strømme Holding AS | | 2024 |
| D Tran Holding AS | Other services | 2022 |
| D Wauer Holding AS | | 2023 |
| D&D Aesthetic AS | Wholesale & retail | 2025 |
| D&D Party Lambertseter AS | Wholesale & retail | 2026 |
| D&G Handel AS | Real estate | 1997 |
| D&J Bygg AS | Construction | 2022 |
| D&P Helse AS | Health & social care | 2021 |
| D&P Holding AS | Health & social care | 2020 |
| D&R Transport Da | Transport & logistics | 2021 |
| D&V Import AS | Hospitality | 2025 |
| D'Or AS | Hospitality | 2012 |
| D'Sound Da | Arts & recreation | 2000 |
| D'Tox AS | Information & communication | 2015 |
| D'Twins Ministop AS | Wholesale & retail | 2023 |
| D+Holding AS | Real estate | 2022 |
| D+Invest AS | Real estate | 2022 |
| D-Fetch AS | Professional & scientific | 2019 |
| D-Fetch Mi AS | | 2019 |
| D-Ko Holding AS | | 2017 |
| D-Profile AB | Wholesale & retail | 2007 |
| D-Profile AS | Wholesale & retail | 2008 |
| D-Scor AS | Information & communication | 2022 |
| D. Berggren Invest AS | | 2023 |
| D. Coffee AS | Hospitality | 2012 |
| D. Lund Holding AS | Financial services | 2005 |
| D.C.S. Holding AS | Real estate | 2014 |
| D.D Holding AS | Wholesale & retail | 2020 |
| D.D. Dagligvare AS | Wholesale & retail | 2021 |
| D.E.X. Holding AS | | 2023 |
| D.Eco by Vaag AS | Professional & scientific | 2024 |
| D.G Optimal Bygg AS | Construction | 2020 |
| D.J. Blikk AS | Construction | 2023 |
| D.Petersen Invest AS | | 2025 |
| D/N Holding AS | Wholesale & retail | 2017 |
| D1-3 Eiendom AS | Real estate | 2011 |
| D10 Grønlikaia Sjø AS | Transport & logistics | 2012 |
| D1A Næring AS | Real estate | 2012 |
| D1A Utvikling AS | Real estate | 2012 |
| D2 Høvleriet AS | Real estate | 2018 |
| D365 Advisor AS | Information & communication | 2026 |
| D44 Eiendom AS | Real estate | 2016 |
| D48 Holding AS | Real estate | 2018 |
| D48 Invest AS | Real estate | 2018 |
| D4DILEVERY AS | Transport & logistics | 2025 |
| D5 Invest AS | Real estate | 2011 |
| D5 Lohavn AS | Real estate | 2008 |
| D6 Loengkaia AS | Transport & logistics | 2012 |
| D68 Consulting AS | Professional & scientific | 2016 |
| D7 Grønlia AS | Transport & logistics | 2012 |
| D8 Grønlikaia AS | Transport & logistics | 2012 |
| D9 - D14 Grønliutstikkeren AS | Real estate | 2018 |
| Da Berthelsen & Ovesen | Construction | 1989 |
| Da Elysee | Arts & recreation | 1988 |
| Da Investing Co AS | Real estate | 2004 |
| Da Silva Maler AS | Construction | 2019 |
| Da Tar Vi Diem Da | Arts & recreation | 2023 |
| Da-Ka Invest AS | Financial services | 1976 |
| Daae Wear AS | Professional & scientific | 2022 |
| Daam AS | Real estate | 2014 |
| Daba Eiendom AS | Real estate | 2006 |
| Dabi AS | Professional & scientific | 2017 |
| Daboda Holding AS | | 2024 |
| Daboo | Wholesale & retail | 2000 |
| Dac AS | | 2017 |
| Dac Kultur AS | Arts & recreation | 2026 |
| Dacap AS | Financial services | 2008 |
| Dacapo Eiendom Ans | Real estate | 1993 |
| Dacapo Film AS | Transport & logistics | 1988 |
| Dacapo Holding AS | | 1992 |
| Dachdeckerei Andreas Witzel | Construction | 2006 |
| Dackel & Daughters AS | Hospitality | 2026 |
| Dackel & Son AS | Hospitality | 2019 |
| Dactylion Holding AS | | 2020 |
| Dadada Da | Arts & recreation | 2025 |
| Dadata AS | Information & communication | 2022 |
| Dadda Invest AS | | 2018 |
| Dade Beharing Systems GmbH | Administrative & support | 2000 |
| Daedalus AS | Professional & scientific | 2012 |
| Daegens Kaffe AS | Hospitality | 2024 |
| Daf AS | Wholesale & retail | 2019 |
| Dafn AS | Information & communication | 2020 |
| Dafne Innovations AS | | 2025 |
| Dafo Consulting AS | Professional & scientific | 2012 |
| Dag Arne Berge Holding AS | Real estate | 2017 |
| Dag Arne Berge Invest AS | Real estate | 2017 |
| Dag AS | Real estate | 2020 |