| Demeter Invest AS | | 2023 |
| Demeure Interiør AS | Professional & scientific | 2018 |
| Deminova Holding AS | Professional & scientific | 2018 |
| Demirbas Holding AS | Construction | 2017 |
| Demler Spezialtiefbau GmbH & Co.Kg | Professional & scientific | 2010 |
| Demmo Holding AS | | 2022 |
| Demolab AS | Professional & scientific | 2023 |
| Demomesser AS | Administrative & support | 2016 |
| Demopartner AS | Wholesale & retail | 2010 |
| Demopartner Holding AS | Professional & scientific | 2010 |
| Demre Forlag AS | Information & communication | 2024 |
| Den Anda AS | Professional & scientific | 2013 |
| Den Brune Haven AS | Hospitality | 1998 |
| Den Danske Johanniterorden | | 1995 |
| Den Fede Danske AS | Hospitality | 2022 |
| Den Flyvende Elefant AS | | 2018 |
| Den Flyvende Tallerken AS | Administrative & support | 1991 |
| Den Følelsen AS | Information & communication | 2022 |
| Den Gamle Skobutikken AS | Hospitality | 2014 |
| Den Gamle Vaktmesteren AS | Administrative & support | 2020 |
| Den Glade Gris AS | Hospitality | 2012 |
| Den Glade Snekker AS | Construction | 2007 |
| Den Gode Hjelper AS | Administrative & support | 2026 |
| Den Gode Kundedialogen AS | Professional & scientific | 2012 |
| Den Gode Rygg AS | Health & social care | 2008 |
| Den Grimme Ælling AS | Hospitality | 2018 |
| Den Grønne Rev AS | Wholesale & retail | 2023 |
| Den Langsomme Reisen AS | Administrative & support | 2021 |
| Den Lille Basun AS | Wholesale & retail | 1994 |
| Den Mangfaldige Scenen AS | Arts & recreation | 2013 |
| Den Norske Ballettskole & Akademi AS | Education | 2008 |
| Den Norske Eiendom AS | Real estate | 2012 |
| Den Norske Husfliden AS | Wholesale & retail | 2004 |
| Den Norske Kokosbollefabrikken AS | Manufacturing | 2024 |
| Den Norske Opera & Ballett AS | Arts & recreation | 1957 |
| Den Nye Skøyen Bilpleie AS | Other services | 2015 |
| Den Polskie Jadlo AS | Hospitality | 2024 |
| Den Rosa Fabrikken AS | Arts & recreation | 2023 |
| Den Røde Gorilla AS | Information & communication | 2013 |
| Den Røde Rønne Eiendom AS | Real estate | 2016 |
| Den Siste Reisen-Begravelsesbyrå I Oslo AS | Other services | 2014 |
| Den Suveræne Sankt Johannes Af Jerusalems Hospitals Orden Supremus Ordo Domus Hospitalis Sancti Johannis Hierosolymitani | | 1995 |
| Den Tysk-Norske Barnehagen I Oslo AS | Education | 2022 |
| Den Unike Plakaten Limited | Wholesale & retail | 2025 |
| Den Ved Siden Av Bowiekniv AS | Arts & recreation | 2013 |
| Denamed AS | Wholesale & retail | 1997 |
| Denario Invest AS | | 2023 |
| Denash Thamotharampillai Holding AS | | 2025 |
| Denby Corp. | Transport & logistics | 2007 |
| Dencker Invest AS | Real estate | 2014 |
| Dendron AS | Professional & scientific | 1995 |
| Denia Event AS | Real estate | 2018 |
| Denimfriends AS | Professional & scientific | 2026 |
| Denios Nuf | Wholesale & retail | 2022 |
| Dennis Kiil Holding AS | Professional & scientific | 2023 |
| Denorma Eiendom AS | Real estate | 1961 |
| Denovo AS | Professional & scientific | 2000 |
| Dent 1 AS | | 2024 |
| Dental & Dermal House AS | Health & social care | 2019 |
| Dental Health Care AS | Health & social care | 2014 |
| Dental Norco I AS | Health & social care | 2016 |
| Dental Nordica AS | Real estate | 2011 |
| Dental Radiologi AS | Health & social care | 2020 |
| Dental Specter AS | Health & social care | 2018 |
| Dental Studio AS | Health & social care | 2020 |
| Dental.No AS | Information & communication | 2026 |
| Dentalia AS | Health & social care | 1995 |
| Dentalpark AS | Health & social care | 2015 |
| Dentalpartner Da | Manufacturing | 2003 |
| Dentalpartnerne I Akersgt. AS | Health & social care | 2005 |
| Dentalyas AS | Health & social care | 2016 |
| Dentalz AS | Health & social care | 2025 |
| Dentas AS | Health & social care | 1986 |
| Dentfriends AS | Administrative & support | 2025 |
| Dentia AS | Health & social care | 2024 |
| Dentimatrix AS | Health & social care | 2015 |
| Dentin Invest AS | Health & social care | 2025 |
| Dently AS | Other services | 2023 |
| Dentsply Ih AS | Wholesale & retail | 1980 |
| Dentsu Norge AS | Professional & scientific | 1971 |
| Deodives AS | | 2026 |
| Deolaso Capital AS | | 2024 |
| Dep-Holding AS | Administrative & support | 2025 |
| Departments & Stores Norway AS | Wholesale & retail | 2005 |
| Depler AS | Information & communication | 2009 |
| Deploi AS | Information & communication | 2019 |
| Depol AS | Hospitality | 2024 |
| Depona AS | Administrative & support | 2008 |
| Deponidrift AS | Professional & scientific | 2015 |
| Deposit AS | Real estate | 2011 |
| Depotgata 22 AS | Real estate | 2006 |
| Der Mill Invest AS | | 2024 |
| Der Peppern Gror AS | Hospitality | 2014 |
| Derav Invest AS | | 2025 |
| Derde AS | | 2024 |
| Dere Bygg AS | Construction | 2019 |
| Derivato AS | | 2014 |
| Derive AS | Information & communication | 2018 |
| Deriveme AS | Information & communication | 2016 |
| Derma Medica AS | Health & social care | 2020 |