| Deco Subsea Nuf | Be-8000 Brugge | 2025 |
| Decobyggeservice AS | Maura | 2019 |
| Decogruppen AS | Reine | 2015 |
| Decor Nor AS | Storsteinnes | 2025 |
| Decorga Pintura S.L. | A Coruña | 2011 |
| Deep Casing Tools | Aberdeen Ab11 5Dp Scotland | 2016 |
| Defiberon AS | Aurskog | 2019 |
| Deg Anlegg AS | Atløy | 2009 |
| Degalot Rørleggerbedrift AS | Oslo | 2020 |
| Degerud Tømrerservice AS | Fagerstrand | 2012 |
| Degvold Bygg Ans | Skreia | 1995 |
| Degvold Uteareal AS | Kolbu | 2014 |
| Dek Overflateteknikk AS | Verdal | 2017 |
| Deka Bygg AS | Moss | 2020 |
| Dekagon AS | Brumunddal | 2023 |
| Dekahus AS | Vestby | 2022 |
| Dekarstwo Adam Reichel | 67-200 Glogow | 2008 |
| Dekket AS | Lierstranda | 2023 |
| Dekmar AS | Oslo | 2015 |
| Deko | Dk-2630 Taastrup | 2018 |
| Deko Bygg AS | Oslo | 2021 |
| Deko Invent AS | Rud | 2008 |
| Dekomte | De-63500 Seligenstadt | 2022 |
| Dekor Bygg AS | Rælingen | 1995 |
| Dekorativ Designs International Ans | Tønsberg | 2003 |
| Dekorbetong AS | Ørsta | 2018 |
| Dekorom AS | Krokstadelva | 2020 |
| Dekorverkstedet AS | Oslo | 2020 |
| Delmas AS | Ål | 2023 |
| Delp Utmarkslag SA | Laukvik | 1995 |
| Delt Holding AS | Drammen | 2024 |
| Delta Drift AS | Trondheim | 2022 |
| Delta Hungaria Epito KFT | 1131 Budapest | 2014 |
| Delta Integrator LLC | Us-North Miami Beach, Fl 33181 | 2018 |
| Delta International Nuf | Ol4 1Sl Oldham, Lancashire | 2018 |
| Deltabryggen AS | Porsgrunn | 2020 |
| Deltabud Spolka Zoo | 03-983 Warszawa | 2006 |
| Dema Boring AS | Oslo | 2024 |
| Dema Brunnsborrning AB Nuf | Se-652 21 Karlstad | 2026 |
| Dema Bygg AS | Nordby | 2024 |
| Demaco Holland B.V. | Nl-1723 Hw Noord-Scharwoude | 2013 |
| Demag Cranes and Components Limited UK | Ox16 1Qz Oxfordshire England | 2010 |
| Demar Interiør AS | Larkollen | 2016 |
| Dematic Limited | Gb Banbury, Oxfordshire Ox17 3Sn | 2019 |
| Demco AS | Nesttun | 2023 |
| Demcon AS | Oslo | 2020 |
| Deme Offshore No AS | Oslo | 2022 |
| Deme Offshore No Wtiv 1 AS | Oslo | 2022 |
| Deme Offshore No Wtiv 2 AS | Oslo | 2023 |
| Demirbas Holding AS | Oslo | 2017 |
| Demmy AS | Mosjøen | 2022 |
| Demotec AS | Larvik | 2012 |
| Den Bygg AS | Vardø | 2023 |
| Den Danske Maler AS | Florø | 2010 |
| Den Glade Maler AS | Vinterbro | 2017 |
| Den Glade Snekker AS | Oslo | 2007 |
| Den Kvikke Murer | Espeland | 2013 |
| Den Lille Husfabrikken AS | Lillesand | 2026 |
| Den Lille Rørhandel AS | Ørje | 2026 |
| Dena Bygg AS | Finstadjordet | 2023 |
| Denholm Environmental Limited | Inverurie Ab51 0Zj | 2011 |
| Denis Bygge Service AS | Ridabu | 2018 |
| Denko AS | Egersund | 2020 |
| Denvago AS | Stokke | 2006 |
| Denvo Property AS | Tromsø | 2022 |
| Dep Holding AS | Lysekloster | 2019 |
| Deponidrift Modum AS | Drammen | 2025 |
| Derbitak Malco AS | Kristiansand S | 2017 |
| Derbitak Østfold AS | Borgenhaugen | 2024 |
| Dere Bygg AS | Oslo | 2019 |
| Dero Entreprenør AS | Vikhammer | 2017 |
| Dervola Maskin Og Transport AS | Jarfjord | 2021 |
| Des Investering AS | Sandnes | 2018 |
| Descent AS | Trondheim | 2022 |
| Descent Holding AS | Trondheim | 2022 |
| Deset Laft AS | Rena | 2002 |
| Design & Butikkinnredning AS | Hakadal | 2018 |
| Design & Montasje AS | Oslo | 2018 |
| Design Bad & Oppusing AS | Strømmen | 2020 |
| Design Bygg Og Malertjenester Nuf | Oslo | 2022 |
| Design Colour AS | Oslo | 2012 |
| Design Construction AS | Vinterbro | 2022 |
| Design Elements AS | Oslo | 2016 |
| Design Rør AS | Andebu | 2025 |
| Design-Hus Bolig AS | Haugesund | 2017 |
| Designbad AS | Oslo | 2025 |
| Designbygg AS | Brumunddal | 2017 |
| Designer AS | Tromsø | 2024 |
| Designer Bolig AS | Hamar | 2013 |
| Designer Group Norway AS | Oslo | 2020 |
| Designpeis AS | Skiptvet | 2012 |
| Designproduksjon AS | Stavanger | 2015 |
| Deske AS | Frosta | 2021 |
| Desna AS | Vikebukt | 2012 |
| Desserud AS | Solumsmoen | 2016 |
| Destia AS | Haugesund | 2015 |
| Destia OY | Fi-00520 Helsinki | 2009 |
| Det Bygges AS | Rossfjordstraumen | 2022 |
| Det Grønne Skiftet AS | Sarpsborg | 2018 |
| Det Kjedelige Selskapet AS | Raufoss | 1992 |