| Dekkstativ Norge AS | Wholesale & retail | 2016 |
| Dekkstra Økern AS | Wholesale & retail | 2024 |
| Dekmar AS | Construction | 2015 |
| Deko Bygg AS | Construction | 2021 |
| Dekode Interaktiv AS | Information & communication | 2009 |
| Dekodet AS | Information & communication | 2020 |
| Dekoratør Anne Berit Urdahl AS | Professional & scientific | 2015 |
| Dekorverkstedet AS | Construction | 2020 |
| Deku Holding AS | | 2022 |
| Del Amitri AS | | 2026 |
| Delbekktoppen Hyttegrend AS | Real estate | 2009 |
| Delcom AS | Wholesale & retail | 2013 |
| Delenitor Norge AS | Education | 2020 |
| Delfin Eiendom AS | Real estate | 2013 |
| Delfin Norway AS | Professional & scientific | 2018 |
| Delft University of Technology | Professional & scientific | 2010 |
| Delhi Tandoori AS | Hospitality | 2013 |
| Deli De Luca Distribunal AS | Transport & logistics | 2008 |
| Deli De Luca Norge AS | Transport & logistics | 2003 |
| Deli Sushi 2 AS | Hospitality | 2015 |
| Deli Sushi AS | Hospitality | 2014 |
| Deli Tomteutvikling AS | Real estate | 2024 |
| Deli Utvikling AS | Wholesale & retail | 2002 |
| Delib Økonomi AS | Professional & scientific | 2019 |
| Delicatessen Aker Brygge AS | Hospitality | 2013 |
| Delicatessen Bodø AS | Hospitality | 2016 |
| Delicatessen Grünerløkka AS | Hospitality | 1998 |
| Delicatessen Majorstuen AS | Hospitality | 2011 |
| Delicatessen Restaurants AS | Hospitality | 2018 |
| Delicatessen Sandvika AS | Hospitality | 2022 |
| Delikat Fabrikker AS | Real estate | 2006 |
| Delitoppen 3 AS | Real estate | 2002 |
| Deliveien 21 AS | Real estate | 2010 |
| Deliveien 3 AS | Real estate | 2015 |
| Deliveien 4 AS | Real estate | 2008 |
| Deliveien 9 AS | Real estate | 2007 |
| Deliveien Tomteutvikling AS | Real estate | 2019 |
| Delivery Hero Dmart Norway AS | Wholesale & retail | 2020 |
| Delivr AS | Transport & logistics | 2025 |
| Dell AS | Wholesale & retail | 1991 |
| Dellia AS | Wholesale & retail | 2017 |
| Dellia Group ASA | Wholesale & retail | 2016 |
| Deloitte Advokatfirma AS | Professional & scientific | 2009 |
| Deloitte AS | Professional & scientific | 1998 |
| Deloitte Services AS | Professional & scientific | 2011 |
| Deloitte Tax & Accounting AS | Professional & scientific | 1982 |
| Delpen Seafood AS | Wholesale & retail | 2019 |
| Delphi AS | Professional & scientific | 2018 |
| Delphin Invest AS | Wholesale & retail | 2005 |
| Delston Capital AS | | 2026 |
| Delt Invest AS | Real estate | 2012 |
| Delta Air Lines, Inc. Nuf | Administrative & support | 1995 |
| Delta Arkitekter AS | Professional & scientific | 2015 |
| Delta Boligeiendom AS | Real estate | 2023 |
| Delta Capital AS | | 2022 |
| Delta Commerce AS | Information & communication | 2003 |
| Delta Compute DC AS | | 2025 |
| Delta Consulting a AS | Information & communication | 2024 |
| Delta Consulting AS | Information & communication | 2024 |
| Delta Consulting C AS | Information & communication | 2025 |
| Delta Consulting Holding AS | Information & communication | 2024 |
| Delta Corporate Finance AS | Professional & scientific | 2012 |
| Delta Gold Mining Limited | Mining & quarrying | 1999 |
| Delta Invest AS | Financial services | 1994 |
| Delta Kompetanse AS | Professional & scientific | 1996 |
| Delta Læringsglede AS | Education | 2024 |
| Delta M. Invest AS | Real estate | 2005 |
| Delta Matte AS | Information & communication | 2026 |
| Delta Media AS | Information & communication | 2016 |
| Delta Orca AS | | 2026 |
| Delta Orca Shipowning AS | Transport & logistics | 2026 |
| Delta Projects AS | Professional & scientific | 2013 |
| Delta Regnskap Og Lønn AS | Professional & scientific | 2025 |
| Delta Regnskap Syd AS | Professional & scientific | 2009 |
| Delta Risk AS | | 2004 |
| Delta Sports Management AS | Education | 2015 |
| Delta T. Invest AS | Real estate | 2005 |
| DELTA1TRADER AS | | 2018 |
| Deltager AS | Information & communication | 2000 |
| Deltakom AS | Real estate | 2022 |
| Deltek Norge AS | Wholesale & retail | 1992 |
| Deltidsjobb Punktum Norge Ans | Information & communication | 1999 |
| Deltron Corporation | Administrative & support | 2008 |
| Deludo Da | Arts & recreation | 2005 |
| Deluxe Entertainment Company Ans | Wholesale & retail | 1996 |
| Deluxe Limo AS | Transport & logistics | 2022 |
| Deluxe Music AS | Wholesale & retail | 2002 |
| Deluxe Taxi AS | Transport & logistics | 2020 |
| Delve Holding AS | | 2026 |
| Delwie AS | | 2021 |
| Dely AS | Hospitality | 2008 |
| Dem Holding AS | Professional & scientific | 2017 |
| Dema Boring AS | Construction | 2024 |
| Demabe AS | Arts & recreation | 2022 |
| Demant Norway AS | Wholesale & retail | 1973 |
| Demba Oslo AS | Education | 2019 |
| Demcon AS | Construction | 2020 |
| Deme Offshore No AS | Construction | 2022 |
| Deme Offshore No Wtiv 1 AS | Construction | 2022 |
| Deme Offshore No Wtiv 2 AS | Construction | 2023 |